Automatic welding control device and method of point welding machine special for winding pad

Abstract

The invention relates to an automatic welding controller and relative method. Wherein, the output of low-frequency signal generator is connected to current limiter; the output of current limiter is connected to the secondary of transformer and the inputs of high-pass filter and amplitude limiter; the high-pass filter and amplitude limiter are connected to rectifier connected to time delayer; the output of time delayer is connected to the first input of comparer; the second input of comparer is connected to threshold value setter; the output of comparer is connected to differentiator connected to timer, zero-over trigger solid relay; the output of relay is connected to the first of transformer; the invention uses one low-frequency signal generator to generate one low-frequency signal higher than 50Hz; uses current limiter to build working voltage at the secondary of transformer, which is divided by the contact between welding clamper and coiling pad, to decide the welding via the volume of voltage. The invention has low cost and reliable operation.

Description

technical field [0001] The invention relates to an automatic welding control device and a control method of a special spot welding machine for wound gaskets, and belongs to the technical field of electronic instruments. Background technique [0002] The production of wound gaskets requires the use of spot welding machines. The structure of the special spot welding machine generally consists of four main parts: controller, solid state relay (or silicon controlled rectifier), welding transformer and spot welding pliers. The welding process is divided into four steps: 1. Preloading, the process of pressing the electrode of the spot welding pliers against the outer edge of the wound gasket and adding preloading, the time is greater than 0.1 seconds; 2. Power welding, in the spot welding The contact between the electrode of the pliers and the wound gasket generates local resistance heat to form nuclei, and the time is about 0.02 to 0.2 seconds; 3. Maintain, cut off the power supp...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the delay time is not easy to control. If the foot switch is stepped on when the spot welding tongs are not in contact with the steel strip of the wound gasket to carry out "electrical welding", there will be a gap between the spot welding tongs and the wound gasket. Arcing occurs, which damages the wound gasket and spot welding pliers; stepping on the foot switch too late affects the production efficiency of the gasket

[0004] At present, there is no public report on the automatic welding control method of the special spot welding machine for wound gaskets that can automatically start the "power-on welding" action without manual operation after "preloading"

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