Making your welder a much more useful tool. What an improvement!
Printable View
Making your welder a much more useful tool. What an improvement!
This data-comparison helps us to determine what the current should be and what the frequency of the pulse, especially for welding thinner steel sheets with butt-welding.
The setting welding current is 100A, base current 5A.
Attachment 36061
In my opinion, up to 900Hz from 500Hz, the higher the frequency of the pulse the easier the control of the arc.
This comparison tells we can raise the welding current safely in higher frequency, since the actual peak welding current does not go up too big for thinner sheet.
Chy
Attachment 36289
This schematic is just for Hitachi's TIG welder, ADGP series. Hope you can apply this for yours thanks.
Chy
Long time since I had to deal with pulse generators like that. Something to watch out for is newer parts switch a LOT faster than the originals, can break the circuit.
I just wanted to warn that trying to duplicate an old circuit with modern chips can lead to unexpected problems. If you don't know about the speed change it can be very confusing to you. I had to go through some old product designs done by another engineer and replace all the circuits like the above with stable ones. Where possible I used digital timing so it's exactly the same every time, but at least using parts with known Schmidt trigger inputs or analog parts makes one happier at the end of the day.
Because of that same issue, I started adding an extra resistor to all my crystal oscillator circuits. The old design started randomly jumping to third overtone which isn't at all what was intended.
Attachment 36293
Attachment 36294
Setting means a lot to this retrofit-unit, for this MIXTIG setting better use 70% to 80% alternative current wave, and 30% to 20% dirrect current especially for thinner aluminium like above case, 1.5mm thick.
Several hits and errors made me get information of better setting.
Hope you can do it better than these above!
Chy