A majority of the welding I do is with .035 wire at about 35 amps. It is critical that you have a "tight metal to metal fit", then no filler wire is needed. Over the years I have collected dozens of clamps, small C clamps, spring loaded clamps and medical clamps. I even use paper masking tape when needed.
My suggestion is to turn the amperage down to lower than you think you will need and strike an arc on some thin sheetmetal and see what kind of puddle you get, then increase the amperage till you're happy with the puddle, remember you cant add wire till you have a molten puddle.
If you are going to use weld wire to simulate wire on a motor, use scotchbrite to remove the copper wash, its easier to do it before weldin than after.
Please feel free to ask any question that comes to mind. In my world there are no stupid questions.
Jim