How tight? Butt tight. Experiment until you get the right power and speed. Smash the end of a piece of copper tubing (1/2 or 3/4) and hold it behind, or have someone hold it or clamp it behind the weld. This will keep it from burning thru. It won't stick to copper (or brass). You need to "spot" weld it like Zoo said, you are only welding for 1 1/2 sec, a ZAP is all, till you get the feel and the correct weld. Right now you're too hot or holding too long. Make sure no breeze/wind around and crank the mix pressure up to around 20-25. You can overlap floors if you want to because no one will see it and it won't create a bump in the carpet. But a Butt weld is the pro way. It's pretty hard to cut pieces that fit BUTT tight but that's what you have to do. Turn the tip/wire a little sideways toward the edge of the floor or the patch, this might help not to aim at the crack. MAKE SURE YOU HAVE A FRESH BARE METAL GROUND SPOT CLOSE TO AREA!!!!!!!! If you have not been practicing this type of weld, slice some thin cuts in a scap piece and weld it back up. or use two pieces butted and weld them till you get better and you get the machine dialed in. Bartamos
