I am new to welding and figured I would google about mig welding and found this site. Very nice write up on the tutorials! I have a 90 amp mig welder I just bought. I am trying to weld exhaust pipe together. It is really for my innercooler setup on my car. I have tried it on low settings and it don't seem to go through themetal as shown in the tutorials. I have tried it on high and I get blow through. Now with the gasless mig welder, how do I control the heat? Is it with the wire feed dial? This is my welder! 90 AMP FLUX MIG WIRE WELDER NO GAS REQUIRED Specifically designed to use self-shielding flux-cored welding wire, eliminating any need for gas and regulators normal MIG welders require. Self regulating feed control Thermal protection with warning light Carry handle on lid Input: 115 volt, 15 amps, single phase Welding current (2 settings) 63 to 68 amps (low), 79 to 90 amps (high) Duty cycle: 10% @ 80 amps, 18% @ 60 amps Wire capacity: 0.035'' or 0.030''