upgrade of the previous one.
for part 2 = • AC- PULSE tig and stic...
schematic of Hf = • HF arc starter [schema...
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Carmel Pule'
This is another excellent and economic manner for controlling the arc of a welder.
With some past students, I needed to be careful how I use the word PULSE and the word FREQUENCY, for frequency, they seemed to understand the main frequency, and for a pulse, the half-wave of the supply,. which in this case remain constant.
1. For power control it is the triggering time, hence the duration of the individual main supply pulses that are controlled at 50/60 or the related 100/120 Triac firing rate.
2. Then the other control is the control of the groups or batches or bunches containing a different number of main supply pulses per periodic time which produces the mark/ space ratio or the relation that exists between, the bunching to no bunching periods. ("Bunches" as we use in Klystrons)
3. The third control is the RATE at which the bunches are generated.
I am rather surprised at the thin size of the feeder cable to the welding rod at 1:16. In my days in the Navy, we used to rate copper at 1000 amperes per square inch, but as a civilian, we rated it at 2000 amperes per square inch!
I am retired now, but if I was still teaching all my students would have been urged to see all the brilliant practical, educational work. To think that all this can be obtained with two transistors operating in an astable mode! or should I say two flip-flops feeding each other!
Well done and thanks again for such good work and the kindness of sharing it with viewers. Students have so much to refer to these days and we should start talking about "reference videos", rather than "reference books".
Негізгі бет let's make a AC- PULSE tig and stick welding machine with HF arc starter [schematic on video]
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