This thing is harder than snot to figure out. I had a 3/4" glob trying to seal and enhaust leak before i stopped, read the manual. Then gave up on the manual and grabbed a pice of pipe. I just cycled through the settings to find something that had the right sizzle sound a d looked like a weld. Once i found that, this thing is off the chain. Good penentration. This thing gets hot in 220. My only other issue was the gas hose is the wrong size for the nipple. Chinese carelessness? But extremely happy. Going to buy a second so i dont have to change the wire to go between steel and aluminum.
Remember trial weld of material, trying to set wire speed, voltage or amps made no positive changes. I just kept selecting menu things and testing to get it to weld right.