Scheme welding semiautomatic with thyristor control. Welding semi-automatic with your own hands. From the inverter for manual welding

The supply of wire into the welding zone in the welding semiautoma takes place using the mechanism of the steel rollers in opposite directions by the electric motor. To reduce revolutions, the electric motor is equipped with a gearbox. From the conditions of smooth adjustment of the wire feed rate, the rotational speed of the DC motor is additionally changed by the semiconductor regulator of the feed of the welding semi-automatic wire. The welding zone also serves an inert gas - argon, to eliminate the effect of oxygen on the welding process. The network nutrition of the welding semiautoma is made of single-phase or three-phase power grid, a three-phase transformer is applied in this design, feedback on a single-phase network that is shown in the article.

Characteristics of welding semiautoma:
Power supply voltage 3-phase * 380 volts.
Primary phase current 8-12 amps.
Secondary tension idle move 36-48 volts.
Idling current 2-3 amp.
Voltage x / x arc 56 volts.
Welding current 40-120 amps.
Voltage regulation + 20%, - 20%.
Duration of inclusion 30%.

Three-phase nutrition allows you to use a winding wire of a smaller cross section than when using a single-phase transformer. When operating, the transformer is less heated, the voltage ripples at the outlet of the rectifier bridge are reduced, the power line does not overload.

Switching connection power transformer T2 to the power grid occurs with Simistor keys VS1-VS3. The selection of simistors instead of a mechanical starter allows you to eliminate emergency situations when the contact breakdown and eliminates the sound from the "chlopings" of the magnetic system.

The SA1 switch allows you to turn off the welding transformer from the network during preventive work.

The use of simistors without radiators leads to their overheating and arbitrary inclusion of the welding semiautoma, so they must be supplied with budget radiators 50 * 50 mm * 40.

Three-phase transformer T2. You can use ready-made, at a power of 2-2.5 kW or buy three transformers 220 * 36 volts 600 VA, used to illuminate basements and metal cutting machines, connect them according to the star-star scheme. In the manufacture self-made transformer Primary windings should have 240 turns of the PEV wire with a diameter of 1.5-1.8mm, with three taps after 20 turns from the end of the winding. The secondary windings are wound with a copper or aluminum cross section of 8-10 mm2, the number of wire PV 3 is 30 turns.

Taps on the primary winding allow you to adjust the welding current depending on the voltage of the power grid from 160 to 230 volts.

The use of a single-phase welding transformer in the diagram allows you to apply an internal power grid used to power the home electric furnaces with an adjusting power up to 4.5 kW - the wire sustains the current to 25 amps, there is a ground. The cross section of the primary and secondary winding of a single-phase welding transformer in comparison with three-phase design should be increased by 2-2.5 times. The presence of a separate grounding wire is required.

Additional adjustment of the welding current is made by changing the angle of delaying the inclusion of simistors. The use of welding semiautoma in garages and dumart sites Does not require special network filters to reduce pulse interference. When using a welding semiautoma in household conditions, it should be equipped with a remote interference filter.

Smooth adjustment of the welding current is performed using an electronic unit on a bipolar transistor VT1 when the "Start" button is pressed by adjusting the R5 resistor - "current".

Connecting the T2 welding transformer to the electrical power system is performed by the SA2 button - "Start" located on the welding wire hose. The electronic circuit through the optocouples opens the power simistors and the voltage of the power grid is entered on the network windings of the welding transformer. After the voltage appears on the welding transformer, a separate wire supply unit turns on, an inert gas supply valve opens and the electrical arc is applied to the vehicle from the hose, the electric arc is formed, the welding process begins.

T1 transformer used to power electronic circuit Starting a welding transformer.

When feeding the network voltage to the symistor anodes through the automatic three-phase SA1 automatic machine to the line, the T1 transformer is connected to the e-launch scheme, the simistors at this time are in the closed state. The VD1 diode bridge straightened voltage of the secondary transformer T1 transformer is stabilized by an analog stabilizer DA1, for stable operation of the control circuit.

Capacitors C2, C3 smooth the pulsation of the straightened supply voltage of the trigger. The inclusion of the simistors is performed using the VT1 key transistor and the Simistor Optopar U1-U3.

The transistor opens with a voltage of positive polarity from the analog stabilizer DA1 through the "Start" button. Using the low voltage button reduces the likelihood of operator damage high voltage Power networks, in case of disruption of wire insulation. The R5 current regulator is adjusted for welding current within twenty volts. The R6 resistor does not reduce the voltage on the network windings of the welding transformer in more than twenty volts, in which the level of interference in the power grid is sharply increasing due to the distortion of the sinusoids of the simistors.

Simistor optocouplers U1-U3 perform electroplating power grinding from the electronic control circuit, allow simple method adjust the angle of opening the simistor than the longer the current in the Optoca LED circuit, the less corner Cutlech and more welding circuit current.

The voltage to the control electrodes of the simistors comes from the anode chain through the symistor of the optocoupler, the restrictive resistor and the diode bridge, synchronously with the network phase voltage.

Resistors in the chains of LEDs, the optopar protect them from overload at maximum current. Measurements have shown that when starting at maximum welding current, the voltage drop on the simistors did not exceed 2.5 volts.

With a large scattering, the steepness of the inclusion of the simistors of their control circuit is useful to be covered with a cathode through a resistance of 3-5 com.

An additional winding is wound on one of the power transformer rods to power the wire supply unit with voltage alternating current 12 volts, the voltage to which must come after the welding transformer is turned on.

The secondary circuit of the welding transformer is connected to a three-phase DC rectifier on VD3-VD8 diodes. Installation of powerful radiators is not required. Capacitor of the diode bridge with C5 capacitor Perform a copper bus section 7 * 3 mm. The throttle DRO1 is made on the hardware from the power transformer of the TC-270 tube lamp televisions, the windings are previously deleted, and the winding of the cross section is not below the 2-fold secondary, before filling. Between the halves of transformer iron choke lay the gasket from the electrocarter.

Commissioning start-up schema The welding semiautoma starts with a voltage check of 5.5 volts. When the "Start" button is pressed on the C5 condenser, the idle stroke voltage must exceed 50 volts of DC, under load of at least 34 volts.

At symistor cathodes with respect to zero, the voltage network should not be different than 2-5 volts from voltage on the anode, otherwise replace the simistor or the control circuit optocoupled.

With low power supply voltage, switch the transformer to low voltage tensions.

When setting up, follow safety.

The starting circuit is mounted on the circuit board, except for the elements: VD3-VD8, T2, C5, SA1, R5, SA2 and DR1. These elements are fixed on the housing of the welding semiautoma. The diagram does not contain indication elements, they enter the wire feed block: the inclusion indicator and the wire feed indicator.

The power chains are made with an isolated conduction with a cross section of 4-6 mm 2, the welding - copper or aluminum bus, the rest - with a wire in vinyl insulation with a diameter of 2mm.

List of radio elements

Designation	A type	Nominal	number	Note	My notebook
DA1	Linear regulator	L7805AB	1		In notebook
VT1	Bipolar transistor	KT815B	1		In notebook
VS1-VS3.	Thyristor & Simistor	TC122-25-12	3		In notebook
U1.	Optopara	Aou103V.	3		In notebook
VD9	Diode bridge	KC407A.	3		In notebook
VD1.	Diode bridge	RC207.	1		In notebook
VD2.	Stabilirton	KS512B.	1		In notebook
VD3-VD8.	Diode	D130	6		In notebook
C1.	Capacitor	0.05 μF 630 V	1		In notebook
C2, C3.		470 μF 10 V	2		In notebook
C4.	Capacitor	0.1 MKF.	1		In notebook
C5.	Electrolytic condenser	33000 μF 68 V	1	KEA-11-10.	In notebook
R1	Resistor	360 Oh.	3	0.25 W.	In notebook
R2	Resistor

Technical data of our welding machine - semi-automatic:
Power supply voltage: 220 V
Power consumption: no more than 3 kva
Operating mode: re-short-term
Operating voltage regulation: Step 19 V to 26 V
Welding wire feed rate: 0-7 m / min
Wire diameter: 0.8 mm
The magnitude of the welding current: PV 40% - 160 A, PV 100% - 80 A
Welding current control limit: 30 A - 160 A

Since 2003, six such devices have been made since 2003. The device submitted further in the photo works since 2003 in the car service and never subjected to repair.

Appearance of welding semi-automatic

At all

Front view

Back view

View of the left

As a welding wire, the standard
5kg wire coil with a diameter of 0.8mm

Welding burner 180 And along with the euro
it was purchased at the welding equipment store.

Scheme and details of the welder

Due to the fact that the semi-automatic diagram was analyzed from such devices as PDG-125, PDG-160, PDG-201 and MIG-180, schematic scheme differs from circuit board, since the scheme was evaporated on the summer in the assembly process. Therefore, better adhere to mounting scheme. On the pCB All points and details are marked (open in the sprint and hover the mouse).

Mounting view

Control board

A single-phase automatic machine of type AE on 16A is applied as a power switch and protection. SA1 - Switch of welding modes of PKU-3-12-2037 type on 5 positions.

Resistors R3, R4 - PEV-25, but you can not put them (I do not stand). They are designed to quickly discharge the throttle capacitors.

Now according to condenser C7. In a pair with choke, it provides stabilization of burning and maintaining an arc. The minimum capacity of it should be at least 20,000 μF, the optimal 30000 Igf. There were several types of capacitors with smaller dimensions and a greater capacity, such as Capxon, Misuda, but they were not reliable, burned out.

As a result, Soviet capacitors were applied, which work to this day, K50-18 per 10000 μF x 50 in the amount of three pieces in the parallel.

Power thyristors for 200a are taken with a good stock. Can be put on 160 A, but they will work at the limit, it will be necessary to use good radiators and fans. The used B200 stand on a non-large aluminum plate.

Relay K1 type RP21 by 24V, variable resistor R10 wire type PPB.

When you click on the burner, the SB1 button fits a voltage to the control scheme. The relay K1 is triggered, thus through the contacts K1-1, the voltage to the electromagnetic valve EM1 of the feed of the acid is supplied, and the K1-2 is on the engine power supply scheme, and K1-3 - to the opening of power thyristors.

The SA1 switch exhibit the operating voltage in the range from 19 to 26 volts (taking into account the additive 3 turns on the shoulder to 30 volts). The resistor R10 is regulated by the supply of welding wire, change the welding current from 30A to 160 A.

When setting, the R12 resistor is selected in such a way that when the engine is twisted, the engine still continued to rotate, and not stood.

When the SB1 button is released on the burner - the relay releases, the motor stops and thyristors are closed, the solenoid valve, due to the charge of the C2 capacitor, still continues to remain open with the acid in the welding zone.

When closing thyristors, the arc voltage disappears, but due to the choke and C7 capacitors, the voltage is removed smoothly, not allowing the welding wire to stick in the welding zone.

Motat welding transformer

We take the transformer OSM-1 (1kW), disassemble it, iron iron to the side, pre-placing it. Make new carcass Coils of textolite 2 mm thick, (native frame is too weak). Cheek size 147 × 106mm. Size of the other parts: 2 pcs. 130 × 70mm and 2 pcs. 87 × 89mm. In the cheeks cut the window with a size of 87 × 51.5 mm.
Frame coil ready.
We are looking for a winding wire with a diameter of 1.8 mm, preferably in reinforced, fiberglass isolation. I took such a wire from the stator coils of the diesel generator). You can apply the usual enamal pipe of the PEV type, PEV, etc.

Fiberglass - In my opinion, the best insulation is obtained

We start winding - primary.The primary contains 164 + 15 + 15 + 15 + 15 turns. Between the layers, we make insulation from fine fiberglass. The wire is as close as possible, otherwise it does not fit, but I usually have no problem with this. I took fiberglass from the remains of the same diesel generator. Everything, the primary is ready.

We continue to wind - seconds.We take an aluminum tire in a glass isolation with a size of 2.8 × 4.75 mm, (you can buy from the winders). It is necessary about 8 m, but it is better to have a small stock. We begin to wind, stacking as close as possible, winding 19 turns, then we make a loop under the M6 \u200b\u200bbolt, and again 19 turns, start and ends we make 30 cm for further installation.
There is a slight digression, personally to me for welding large parts at such a voltage was not enough current, during operation I rewound the secondary winding, adding 3 turns on the shoulder, while I got 22 + 22.
The winding climbs in bulk, so if you get used carefully, everything should turn out.
If you take the enamel on the first to take the enhancement, then I must impregnating varnish, I kept the coil in varnish for 6 hours.

We collect the transformer, we turn into a socket and measure the idle current of about 0.5 A, the voltage on the secondary from 19 to 26 volts. If everything is so, then the transformer can be put aside, it is no longer needed.

Instead of OSM-1 for a power transformer, you can take 4pcs TS-270, though there are few other sizes, and I did only 1 welding machineThe data for winding no longer remember, but it can be calculated.

We will wind choke

We take the OSM-0.4 transformer (400W), take the enamel with a diameter of at least 1.5 mm (I have 1.8). We wash 2 layers with insulation between layers, put the density. Next, we take the aluminum tire 2.8 × 4.75 mm. And we wash 24 turns, free tire ends are 30 cm. We collect a core with a gap of 1 mm (pave pieces of textolite).
The choke can also be winding on the hardware from the TC-270 color tube TV. Only one coil is put on it.

We have another transformer for powering the control circuit (I took it ready). It should produce 24 volts at a current of about 6a.

Corpus and mechanics

With trance figured out, proceed to the body. The drawings do not show the flashes of 20 mm. Corners weld, all iron is 1.5 mm. The base of the mechanism is made of stainless steel.

Motor M is applied from wiper VAZ-2101.
Removed Return Return to Extreme.

In the jams for creating a brake force, a spring is applied, the first one that fell at hand. The brake effect increases the squeezing of the spring (i.e., twisting the nut).

Semi-automatic welding Do with your own hands is made of remedies. The welding semiautomatic device can be used to repair vehicles, construction frames of greenhouses, manufacturing metal products.

Welding semi-automatic applied in different areas: in construction, in mechanical engineering, in the manufacture of metal structures and in the installation work.

Choice rules

It is first recommended to choose a gun and a carbon dioxide cylinder. If desired, protective gas is used. Specialists recommend thinking of the functioning of the wire feeding mechanism. Before deciding how to make a welding semi-automatic, it is necessary to find out its component parts. The pistol and the balloon are the necessary elements of the welding machine. Experts advise carefully to choose a gas cylinder. Initially, a carbon dioxide fire extinguisher can be used, but such a replacement is short-lived.

With the help of a gun, the wire coil is fed to the welding zone. The hose is attached to this device, which gives gas. The substance is supplied to the pistol snap electromagnetic valveWarning with the closure of the wire coming into contact with the surface of the pistol.

The gun for the self-made welding machine is chosen based on personal preferences. Experts do not recommend purchasing cheap devices in which a low-quality gas hose has been installed. Semiautomatic welding can be equipped with a CO2 gas system. In this equipment, the use of gas is necessary to obtain high-quality seams. Carbon dioxide is supplied to the welding area, which protects it from the effects of nitrogen and oxygen. In the seams performed by a gas apparatus, there is little slag.

Gas welding can be replaced by powder wire. The advantages of this system are in the absence of the need to use gas and the speed of the workflow, but the quality of the seams is low. Gas protection is necessary if high demands are presented to the products.

The device that serves a wire can be collected using a wiper engine in cars. Roller put on the shaft. It is possible to prevent its slip on the leading roller if you additionally click the design firmly attached satellite roller.

Welding for which welding semiautomatic can use rectifier. It is chosen depending on the way of winding the corresponding transformer. Production of a welding machine with 2 windings will require the use of 2 diodes "DL161-200". The bridge scheme of the rectifier will require 4 diodes. A condenser (30000x63B) helps to smooth the voltage ripples.

In the DC circuit, in order to increase the stability of the burning of the arc after rectifying diodes, it is necessary to install the throttle wire wounds wound on the transformer core by approximately 20. Core section - 35x35 mm. The wire diameter should be no less that used for the secondary winding in the transformer. The power supply of the electric motor that is used in the wire mechanism comes from the power supply, in which the current is equal to 5 A, and the output voltage reaches 12-15 V.

Welding semiautomes are additionally equipped with:

electromagnetic launch for inclusion;
electric valve for gas;
sleeve for wire feed.

Additional work

Semi-automatic, with their own hands made, can be high quality and reliable if all the nuances will be thought out. You can adjust the wire feed speed in the process of operation of the welding machine using a variable resistor. The gas supply valve will be opened synchronously with the power transformer when clicking on the Start button.

The scheme on which the semi-automatic will be made with their own hands can be changed, taking into account the available parts available.

In the block, the rectifiers are located:

throttle;
bridge rectifier (200 A);
electrolytic capacitor, the container of which is 22000 Igf and more (63 V).

The throttle is required to filter the variable of the component of the device. When using the TC - 270 transformer, there are enough 60 turns of the winding. To one end of the throttle of the welding machine, it is necessary to connect the "+" rectifier, and to another end of the "+" condenser and the cable that will serve the "+" rectifier, which is equipped with a welding semi-automatic, on wire. The gun with the Wire must be connected to one of the valve contacts. The minus rectifier and the 2nd contact of the valve is required to connect to the product.

Make a welding semiautomatic device yourself without unnecessary costs, using an electric valve from the Zhiguli car. Using pressing the button, the wizard can include the MPP, the wire will be supplied to the head of the gun, the closure chain of the electroclap, which is responsible for supplying the gas. The nutrition of the valve feeding the substance and the MPP engine is performed using an additional transformer (200 V). It is recommended to close access to the "stuffing" of the device so that welding works are safe.

The welding semiautomatic is a pretty popular device among professional and home masters, especially those who deal body repair. This unit can be purchased already in the finished execution. But many owners of welding inverter devices are asked: Is it possible to redo the inverter in a semi-automatic in order not to buy another welder? Make a semi-automatic inverter with your own hands - the task is quite complicated, but with a strong desire quite feasible.

For the assembly of the unit, the following elements will be needed:

inverter welding machine;
burner, as well as a special flexible hose, inside which a gas pipeline guides a wire, power cable and electrical control cable;
mechanism for uniform automatic wire feed;
control module, as well as engine speed controller (PWM controller);
a cylinder with protective gas (carbon dioxide);
electromagnetic valve for gas cutting;
coil with electrode wire.

To collect homemade semi-automatic welding inverterThe latter should produce a welding current of at least 150 A. But it will have to be slightly upgraded, since the inverter voltamper characteristics (WA) are not suitable for welding electrode wire in the protective gas environment.

But about this later. First you need to make a mechanical part of the semi-automatic, namely the wire feed mechanism.

Electrode Wire Feed Mechanism

Since the feeding mechanism will be placed in a separate box, then for this purpose it will be perfect case from computer system. In addition, you do not need to throw out the power supply. It can be adjusted for the operation of the mechanism of broach.

To begin with, you need to measure the diameter of the coil with wire or, finding it on paper, cut the circle and paste it into the case. Around the bobbin should be enough space to accommodate other nodes (power supply, hoses, and wire pulling mechanism).

The wire feeder is made from the engine cleaner mechanism from the car. It is necessary to design a frame that will also hold the clamping rollers. The layout must be drawn on a dense paper in real scale.

Tip! The connector for connecting the burner hose and the hose itself with a burner can be made with your own hands. But it will be more correct to buy ready setwhich has an affordable price.

The feeder must be installed in the housing so that the connector is located in a convenient location.

So that the wire is fed evenly, all components must be fixed exactly opposite each other. The rollers must be centered relative to the opening for the input fitting, which is located in the connector for connecting the hose.

As roller guides, you can use suitable diameter Bearings. On them with turning machine A small groove is cleaned, which will move the electrode wire. For the housing of the mechanism, you can use the phaneer with a thickness of 6 mm, textolite or durable sheet plastic. All items are fixed on the basis of as shown in the following photo.

As the primary guide for wire is used drilled along the bolt axis. As a result, it turns out the similarity of the extruder for wire. At the entrance of the fitting dresses a cambrick, reinforced spring (for rigidity).

Rods on which rollers are fixed, also spring. The clamp of the clamp is installed with a bolt, located below, to which the spring is mounted.

Tip! If for any reason you have no opportunity to make a mechanism for pulling a wire with your own hands, then you can buy it in China. There are 12 V and 24 V mechanisms on sale in this case, since it is used from a computer from a computer, a device with power from 12 V.

Foundation for fastening Bobbins can be made of a small piece of plywood or textolite and pruning plastic pipe Suitable diameter.

Mechanic Management Scheme

To achieve good quality Seam during welding, it is necessary to ensure the supply of wire with a certain and constant speed. Because the engine feeder corresponds to the feeder from the wiper, then a device that can change the speed of rotation of its anchor is required. For this suitable ready decisionwhich can also be purchased in China, and is called it

Below is a scheme from which it becomes clear how the speed controller is connected to the engine. The controller controller with a digital scoreboard is excreted on the front case panel.

Next, you need to install gas valve control relay. It will also manage and start the engine. All data items should be activated when you press the start button located on the burner handle. In this case, the gas supply to the place of welding should be ahead (approximately 2-3 seconds) the start of the wire supply. Otherwise, the arc will sound surrounded by atmospheric air, and not in the protective gas environment, as a result of which the electrode wire melts.

The delay relay for self-made semiautoma can be collected based on the 815th transistor and condenser.. To get a pause for 2 seconds, there will be enough capacitor for 200-2500 Igf.

Tip! Since the power comes from a computer BP, which gives the voltage of 12 V, instead independent manufacture Module can use a car relay.

It is accommodated anywhere where it will not interfere with the operation of moving nodes, and is connected to the chain according to the scheme. You can use the air valve from GAZ 24 or buy a special, intended for semi-automatic. The valve is responsible for the automatic supply of protective gas to the burner. It turns on after pressing the start button located on the semi-automatic burner. The presence of this element saves gas consumption significantly.

But as already noted, for the full operation of the semi-automatic, the inverter is not suitable for the full operation of the semiautom. Therefore, that the semi-automatic prefix worked in a pair with an inverter, in his electrical circuit It is required to make minor changes.

Changes in inverter

To change the inverter flux, there are many schemes, but the easiest way to do this is as follows:

collect the device using chokes from daylight lamp according to the scheme below;

to connect the collected device, you will need to assemble another block according to the following scheme;

to the inverter did not work the overheating sensor, it is necessary to solder (parallel) to it, as shown in the following scheme.

But if the welding current control in the inverter occurs with the help of ShuntaYou can collect a simple scheme of three resistors and the modes switch, as shown below.

As a result, the alteration of the welding inverter in the semi-automatic will cost 3 times cheaper than the finished aggregate. But of course, for self-assembly The device will need to have certain knowledge in the radio.

Welding semiautomaticate, with their own hands created, needed in any household. The quality operation of such a device is provided with an electronic component and the use of carbon dioxide as a welding medium. An indispensable such device is when repairing and performing compounds from thin sheet metalWhen the likelihood of billet is large when using conventional electric arc welding with electrodes.

The homemade welding semi-automatic make with their own hands is not easy because of the complexity of its design. Before designing a welding semiautoma, you need to prepare all the necessary elements of the equipment. For welding, you will need to prepare the following elements and materials:

an inverter that will be able to produce a working current of up to 150 A;
feeder;
burner;
flexible carbon dioxide supply hose;
coil welding wire;
welding process control unit.

Design of welding semiautomatics

Semi-automatic welding works using carbon dioxide, which ensures the protection of the molten metal from the interaction with oxygen and air nitrogen.

Under the influence of high temperature, carbon dioxide decomposes on carbon monoxide and oxygen, oxidizing the welded metal. To prevent the oxidation process in the welding semi-automatic, a special welding wire is used, which has a coched surface. The copper of the wire is complied with silicon and manganese, which prevent the oxidation process. The welding wire supply is carried out by a special feed mechanism, providing uniform promotion of wire to the zone of welding.

Back to the category

The supply mechanism of the welding semiautoma

The feeding mechanism for semi-automatic welding requires special attention. This device serves to uniform wire feed into the melting area. The supply of material is carried out by using flexible hose. In the ideal case, the feed rate corresponds to melting speed.

The material feed rate is one of the most important criteria that ensures the quality of the seam of welded blanks. When designing this mechanism, it is required to provide for the possibility of regulating the feed rate consumables.

This function is required in order to have the ability to work by consumables. various diameters. Welding wire is wound on special coils installed in the material feed mechanism.

In order to construct the mechanism, you will need two bearings and electric motor from automotive janitors. The smaller the engine, the better for the mechanism. When the engine is selected, it is necessary to check that it rotates in one direction, and did not rotate with a certain periodicity from side to the side. In addition, it will take to make a roller with a diameter of 25 mm. This design element is installed over the thread on the motor shaft.

Back to the category

Design of the feeding mechanism

The design of the mechanism includes two plates on which bearings are fixed, pressed against the roller on the electric motor shaft.

Compressing metal plates and clamping of bearings is carried out using a specially installed spring. The wire broach is carried out by passing it along the guides and between the roller and bearings.

The mechanism is mounted on the surface of the textolite plate, the thickness of which should be at least 5 mm. Installation is carried out in such a way that the wire exit in the place where the connector will be installed for connecting the welding sleeve.

The plate is mounted on the installation of the reel on which the welding wire is winding.

The fastening for reels is a shaft, fixed at an angle of 90 ° to a plate of textolite. At the end of the shaft, a thread is cut to screw the nut.

Back to the category

Welding Welding Control Device

As a case for the feed mechanism, a housing can be used from a computer unit, which is enhanced for legend to it more stiffness to several metal corners. The electronic part of the device is mounted in the case.

The computer case includes a power supply that can be used to pick the drive electric motor, in addition to this, the power supply contains the elements used in the creation of the flow control mechanism into the welding zone.

The simplest and most reliable way to control the flow rate of the consumable material is a circuit collected on the basis of thyristors. SAMI simple scheme Control does not have a smoothing capacitor. Diode bridge can use any design that can give a current exceeding 10 A.

The transformer used to supply the voltage to the mechanism drive electric motor must have a power exceeding 100 W. In the regulatory mechanism scheme, a thyristor WTV16 is used, which has a flat housing, or a thyristor with the CU202 marking, which in its marking can have different letters, they do not affect technical qualities The element used in the operation of the flow control scheme into the welding zone.

Back to the category

The subtleties of creating a transformer block and configuration of the inverter

For the operation of the inverter welding machine, a toroidal type transformer is best suited. The fact is that the efficiency of a toroidal type transformer is significantly higher, and the degree of dispersion of the magnetic field is minimal.

It is worth noting that this type of transformer has one drawback - the complexity of the winding. Primary winding is done with copper wire. The secondary shell is wound with an aluminum tire with 16x2 mm sizes. Before carrying out the winding primary and secondary, it is required to carry out the calculation need quantity Wire. When installing the transformer, it is necessary to provide a place to install the fan for it, because during the operation of this component of the welding machine under load a large number of Heat requiring a removal from the area of \u200b\u200bthe device component to avoid overheating and brave.

For input and output rectifiers, for power keys soldered to copper substrates of the power part, you need to provide high-quality cooling. This is achieved by installing good radiators. In the housing, the most heating radiator is a thermal sensor. After all assembly works, the strength part connects to the control unit. Connecting silence block To the control unit, the device includes network.

After starting the device, the oscilloscope is connected to it. With the help of oscilloscope there are two-polar pulses, the frequency of which is 40-50 kHz. The correction of time between pulses is carried out by changing the voltage at the input. The time between pulses should be 15 μs.

The pulses on the oscilloscope screen must have rectangular fronts, the duration of which is 500 ns. The welding machine indicator after its inclusion in the network must show current in 120 A. In the event that this indicator is not reached, it is required to eliminate the cause of low voltage in welding wires. This is often the case if the input voltage is less than 100 V. When the necessary parameters are reached, it is required to test the device by changing the current in constant voltage control. After testing, the temperature is checked.

After the first stage of testing the welding machine inverter type Testing in a loaded state. For this purpose, it is used as a load of 0.5 ohms, which must withstand current by force of 60 A.