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Interface between CC welder and Miller mig spoolgun.

I recently bought a Syncrowave 350 that I'm really pleased with. This complements my very small MIG welder that I thought have also considered replacing. Then I thought it'd be cool to hook up a spoolgun to the Syncrowave and ended up getting a Miller 185 spoolgun for a pretty good price. I have some experience with electronics and wanted to build a "voltage sensitive" wire feed controller to interface the gun to this CC welder. I looked at the Ready welder, but paid about a third of the price for the Miller so I bought it instead. Has anybody out there got plans or ideas for an interface that would vary the preset wire speed somewhat based on the characteristics of a CC machine? I've already got a high current contactor and gas solenoid, and was thinking about using an LM-317 and altering the voltage control leg for the voltage sensitive feature, since the spoolguns seems to draw under and amp at 24 vdc. Thoughts? I'll publish my successful solution so others could consider other spoolguns besides the Ready Welder for CC sources. It'd be nice ot have the choice wouldn't it? Thanks!!

Reply to
dan tadie
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Dan, Consider making a 'pedal replacement' for when you MIG weld with the TIG machine. It's common in switched mode power supplys to have an inner curent feed back loop controlled by an outer voltage feedback loop. A zener (about 20 volt), resistor and the LED of an opto isolator accross the arc and the phototransistor of the opto in series with a resistor to simulate the pot of the pedal. One would need to use a scratch start or HF start TIG mode (lift arc would get in the way) but by using the spool gun's trigger to start the TIG even gas control would be done by the TIG, may need a relay accross the arc to control the feeder.

Regards Jerry

dan tadie wrote:

Reply to
jerry

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