Soft welder. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Soft welder. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / welding equipment

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Many years ago, when I seriously began to engage in technical creativity, I realized that I could not do without a welding machine in this matter. From that time on, I began to take an interest in them. It seems to be not such a complicated device, but there is still no limit to its perfection. Both specialists and practitioners are racking their brains over it: how to make it even simpler, but at the same time better.

Here I am, having made the first welding machine for myself and worked with it. began to think about how to improve its characteristics. I looked through some available literature on this topic, began to delve into the theory. Over time, I made another apparatus, of course, no worse than the first, but I felt that I could do better. In addition, there was a lively and increased interest in everything related to welding processes and devices for it. I began not only to read, but also to collect literature and publications on this topic. I am grateful and grateful to all the authors of articles about welding machines that were published in the magazine "Modelist-constructor".

I spent a lot of time in my garage, making and testing various welding machines. As a result, I came to such a "welder" scheme, which I myself am satisfied with, and I am not ashamed to advise others.

I want to note that welding machines with rectifiers, that is, those operating on direct (pulsating) current, are obviously better than "variables" - those that work without a diode bridge. But the "permanent" ones also need fine-tuning and tuning. Therefore, I propose tried and tested improvements.

First of all, this concerns the inclusion in the circuit between the positive and negative wires of the rectified current of the capacitor C1. An electrolytic capacitor with a capacity of 15000 microns, designed for a voltage of 100 V. It provides reliable, but at the same time smooth ignition of the arc. If such a capacitor is not possible to purchase, then instead of it you can put a capacitor C1 = 50 microns x 160 V, but already in the positive half-cycle current circuit, as indicated in the diagram.

soft welder
Rice. 1. Schematic diagram of a DC welding machine with control capacitors

And further. It will be useful to put a paper capacitor of the MBGO or MBGI type with a capacity of 160 microns in the primary circuit. rated for 500 V to smooth power surges.

Author: A.Zaitsev, Petrovsk, Saratov region

See other articles Section welding equipment.

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