Are you positive that all your connections are right. Do you have hf set to "start"
If you are welding DC try turning off HF and scratch start to see if it welds better.
Are your consumables in good nick, too much gas etc etc
Cheers
Hi
Educated guess it will be the main rectifier, the thing with 2 square ally plates near the top of machine, and the arc you get at the points is normal on a lot of these smaller machines.
You could replace the diodes but that size rectifier should be cheap enough over there. See if you can...
Personally would not use an oxygen regulator for argon and co2, the regulator may have an outlet pressure of up to 2000 kpa, your flowmeter will only handle about 300 kpa at most. So you may take your eye out if the pressure is too high or the regulator is faulty and the pressure "creeps". Also...
Sounds like the power capacitors are shot and probably more!
Got some clear photos?
A lot of these machines have an input protection which will shut it down if the voltage is too high or low. Maybe yours does not.
Personally would never use an inverter on a generator unless I knew it had...
You can meter it. Put meter on diode, one probe on the case and other to one pin then reverse probes should only get a diode drop maybe .2 or so. do the same to other pin and between the two pins. If you get zero reading then it is shorted.
Are you using CO2? Worst shielding gas ever for welding !
Dont know machine but is the polarity correct, ie can you change the polarity from gas to gasless?.
Gas should be around 10LPM, too much is as bad as not enough.
Correct contact tip? Never use an oversized or drilled out tip unless...
Should be a large silver transistor marked Q1 either on the pcb or wired to it, it is probably shorted. As long as you have checked the pot and it is OK.
The transistor should be marked 2N?????
You will have to know whether or not your rectifier is half wave or full wave and having the polarity of the diodes correct ie reverse or forward bias and installing them correctly.
It is not as simple as bunging in some diodes.
Refitting press fit diodes is not a simple matter.
Would just...
Try a zener diode in parallel with the motor. You will have to experiment with different voltages, use 5 watt types minimum.
Have used these before with success, on small migs.
That would be open circuit voltage, no load except for motor.
So if something was hot then as it cooled would increase open circuit volts which would increase motor speed if not welding.
But if welding and overheating then arc volts would decrease, so might have to decrease speed.
Have not...
I would think that he is saying that the arc volts is decreasing, so the motor speed would have to be decreased to compensate for less arc volts.
Otherwise the wire would "hammer".
Had a customer bring in a SIP 100. I immediately broke out in a sweat!
Anyway got it going.
Thought I might have a play with it.
.8 wire
corgon 5/2 gas, equiv boc light I think
Max open circuit 33vdc
Welded with it, pretty good actually, fairly smooth considering.
19vdc load @ 71amps...
My sympathies also
The negative and positive might be like a "voting" switch, as in referring to the machines performance, think the negative will get a work out :whistle: