I have a brand new Lincoln 140T. I am trying to construct a welding cart using some 1 1/2x 1 1/2x 1/8 angle steel and some 1/8 thick 1x1 tubing. I can not get penetration. I have tried .25 and .30 wire. The .30 wire will not keep going. And thats at the highest setting. It just pops and pushes the gun away. The .25 sounds good, but no penetration. The weld looks like some one turned off the gas. It has pin holes through it. I turned the the setting down and it does the same. Is it possible the garage I'm using is too cold. Its about 50-60 degress and metal is cold. And I am on concrete. I'm not sure if everything is set correctly. The wire tension and reel tension. There is another knob inside and I cant tell what it is for. Anyone have this machine. Does the gun just slide into the machine or does this knob hold it in place. Instruction where partly destroyed.