I got my little century 100 welder working with shielding gas finally. I bought it used, maybe 15 years ago as a flux core 120V "portable". welder. Maybe 5 years ago, the FCAW welds got crappy. I had to replace some diodes. It has 2 stacks of 6 little flat "pill" diodes. I was told they used to be used in the first generation GM Delco alternators too. (1960s). I knew it had a gas valve but between the cost of tank, regulator, flowmeter and hose, I never made the conversion. Last year I needed to do some body work and bought all the stuff. It did not go well, and I got ugly welds, but they stuck, and the warts could be ground off, and welds redone until I was happy enough for out of sight repairs. I thought some of the diodes had gone bad again. THis time in going into the guts, I found the hose from the gas valve was off the feed end of the line to the gun. So, I put that on and tried it.
Still lots of ugly welds trying to find a heat/speed combination that worked. It only has 4 settings, labelled 1,2,3, and 4; with speed labelled 1-10. I tried to find starting points online but everyting said "refer to the manual". I have no manual and none appear to be online. This is probably 40 years old, so the factory ahd dealer response is "Buy a new one." But I did find that with 3 and speed of 6 I could get a nice bead with .030 wire. I need to do some welding in the trunk (out of sight) of one of my cars, so I hope I can make some half fast welds when the rime comes. (say the words half and fast together real fast)
If anyone has any experience with this machine in mig/GMAW form, I'd appreciate any words of wisdom. 50 years ago in my weld ing class, there was one (1) GMAW welder for 30 people, so My experience was mininmal. They did have 4 (WWII surplus) one ton huge amp motor generators and plenty of ac/dc buzz boxes, so I did most of my work with 6010 DC, and those motor generators were awesome when I could snag one of them!
The instructor had been a Navy Chief in WWII and all the kids but me hated him, because everything had to be done his way. I listened and learned and I loved him. He was a walking encyclopedia.