SU1428551A1 - Capacitor welding machine for resistance welding of parts - Google Patents

Abstract

The invention relates to the welding industry, namely to contact welding with preheating on condenser welding machines. The invention of pzvvolat improves the quality of the weld due to the optimal shape of the welding pulse. The capacitor-arc machine contains a control rectifier, a limiting resistor, a shunt switch, a reversing contactor, a capacitor, a welding transformer, three keys and a booster transformer with counter-wound windings. The machine allows varying the duration of the capacitor discharge over a wide range. Thereby, the rise and fall of the welding pulse is controlled. The last g approximates to almost rectangular. form. 3 pe.

Description

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The invention relates to the welding industry, namely to contact welding with preheating on condenser welding machines.

The purpose of the invention is to increase the ka-g. fair welding due to the optimal shape of the welding pulse. ten

; FIG. 1 shows the electrical circuit of the proposed capacitor welding machine; in fig. 2 and 3 - diagrams of each of the directions of operation of the device. -15

Capacitor welding machine for contact welding of parts contains a controlled rectifier 1, a limiting resistor 2, a shunt thyristor 3, a reversing contactor 4, a 20 capacitor 5, a welding transformer 6; booster converter 7 with primary 8 and secondary 9 windings, the first 10, the second 11 and the third 12 keys and the control circuit 13 - 25.

Reversing contactor 4, the first 10, the second 11 and the third 12 keys - reversible blocks. - and at every moment

9 of the booster transformer 7 and connected to the beginning of its secondary winding 9. The voltage of the latter is applied in the locking direction to the second switch 11, and the voltage across the booster transformer 7 is increased at the welding transformer 6.

When the booster transformer 7 is turned on, its primary winding 8 is energized by its secondary winding 9. In this case, the discharge of the capacitor 5 to the welding transformer 6 occurs more efficiently.

After the capacitor 5 is discharged and then partially recharged by the inductance of the transformers, the circuit is ready for the next cycle. The next cycle is carried out with a reverse voltage across the capacitor 5.

The polarity of the voltage on the capacitor 5 is provided by connecting the corresponding elements of the reversing contactor 4 of the first 10, second 11 and third 12 keys. Each transformer adjusts with its tap-offs to the desired value while the time is running in one of the 30 directions. The main stage is formed by

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SRI. The elements of these blocks (Fig. 1), working in one of the directions, are blackened, the elements of the other direction of these blocks are left light.

When the controlled thrower 1 and the reversing contactor 4 are turned on in a given direction, the capacitor 5 is charged.

The voltage of the capacitor attorney 5 is closed by the reversing contactor 4, and the controlled rectifier 1 - after passing the mains current through a zero value. A signal is now given to turn on a key 10 and second 11 key and to a welding transformer 6, while the capacitor 5 starts to discharge. A signal is given to turn on the third key 12, after a predetermined delay. The primary winding 8 of booster transformer 7 is sequentially connected with the third key 12 to the connection point of the second key 11 by the primary winding of the welding transformer 6 and the secondary winding

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switching on both transformers. Since in each of the transformers all the winding is used at any stage, this provides for more optimal characteristics of the welding impulse, which ensures the expansion of technological capabilities. This improves the quality of welded joints.

Claims (1)

Invention Formula Capacitor welding machine for contact welding parts containing a worker. a capacitor to one lining which is connected via the first and second keys to the output of a welding transformer, to the other output of which another lining of the working capacitor is connected and through the third key to a booster transformer, which, in order to improve the quality of the welding connection, due to the optimal shape welding pulse, booster transformer windings are connected in opposite direction, while the connection point of the first and second keys is connected via the secondary winding 9 of the booster transformer 7 and connected to the beginning of its secondary winding 9. The voltage of the latter is applied in the locking direction to the second switch 11, and the voltage across the booster transformer 7 is increased at the welding transformer 6. When the booster transformer 7 is turned on, its primary winding 8 is energized by its secondary winding 9. In this case, the discharge of the capacitor 5 to the welding transformer 6 occurs more efficiently. After the capacitor 5 is discharged and then partially recharged by the inductance of the transformers, the circuit is ready for the next cycle. The next cycle is carried out with a reverse voltage across the capacitor 5. The polarity of the voltage on the capacitor 5 is provided by connecting the corresponding elements of the reversing contactor 4 of the first 10, second 11 and third 12 keys. Each transformer adjusts with its tap-offs to the desired value of the voltage. The main stage is formed by five R 0 switching on both transformers. Since in each of the transformers all the winding is used at any stage, this provides for more optimal characteristics of the welding impulse, which ensures the expansion of technological capabilities. This improves the quality of welded joints. Invention Formula Capacitor welding machine for contact welding parts containing a worker. a capacitor to one lining which is connected via the first and second keys to the output of a welding transformer, to the other output of which another lining of the working capacitor is connected and through the third key to a booster transformer, which, in order to improve the quality of the welding connection, due to the optimal shape welding pulse, booster transformer windings are connected in opposite direction, while the connection point of the first and second keys is connected via the secondary winding booster transformer with a welding transformer and Another output booster transformer. 12 -I-I, -Y. t 1 1 ъ 13 ten eleven (Rig.2 fPUBJ