Greets all.. I've got a 3ph 300A Italian-made Weldtronic mig welder.
Have had it a few years now, gone through 2 or 3 replacement guns,
without any problems. Lately, however, its been acting strange: poor
starting.. 2 out of 5 times when i start a bead the wire "blows" and
melts back into the nozzle. been losing more time fishing the thing
back out.. usually shaking the gun around (i try to not bang it) breaks
the wire free and i'm good to go again.
first 1/4" or so of weldbead is *always* cold. real ugly looking and
lots of spatter. my work-around has been to fire the gun on my
weldingtable.. like a little spot weld.. and then pick up on my work.
this way it welds just fine -- but now i spend my last 1/2hr of the day
grinding down all the spotweld bumps on my welding table.
anyone have any idea what might be causing this? i have changed to a
new gun recently (not an OEM gun) but i'm not sure if this is when the
problems started.. plus.. what difference could the gun make?
I have a "stick out" trimpot on the front of the machine that goes
through 3/4 of a turn with a small screwdriver. have no idea what its
really for, but messing with it doesnt seem to change the symptoms.
16 years ago