By production of welding quite often it is required to change parameters of technological process. Most often the welding current needs adjustment. Some devices have the built-in mechanisms of adjustment of operating parameters. If your equipment is not supplied with the regulator, make it independently.
It is required to you
- - standard switch of current;
- - current adjuster of welding transformer.
Instruction
1. Use method of its step adjustment for reduction of force of welding current. For this purpose change number of rounds, connecting them to conclusions of secondary winding of the transformer. Such way is simple, but does not allow to make change in wide limits.
2. Pick up the standard switch which maintains current up to 250-260 for secondary chain of the transformer And. This way demands smaller intervention in engineering device of the device, however to pick up the switch with the parameters suitable for the specific welding machine, very not easy.
3. Manufacture the regulator of welding current with application of thyristors. The advantage of the scheme provided on the drawing consists in its simplicity and availability of the majority of the elements used in regulator design. To all other, the device practically does not demand additional control.
4. Make adjustment of parameters of the device at the switched-off primary winding of the transformer. Include the thyristors which are basic elements of design of the regulator opposite, in parallel each other.
5. Regulate the moment of adjustment of current change of resistance of the R7 resistor. At the same time parameters in the primary winding of welding transformer will change. It is in such a way convenient to change working current of the device in any given party. Adjust the range of change of current, having picked up parameters of this resistor by practical consideration.
6. Use in the scheme of the regulator of current intensity transistors of old sample, for example, of GT308 or P416. In the absence of these devices replace them with more modern high-frequency devices with similar parameters.
7. If you did not manage to find VT1 and VT2 transistors and also R5 and R6 resistors placed in basic chains, replace them with dynistor. Attach anodes of dynistor to extreme resistor terminations of R7, connect cathodes to R3 and R4 resistors. The KH102 dynistor is the most suitable for use in the provided scheme.