Some welding questions for the pro\'s!!! I am using a Marquette 135amp MIG. 1. What is a good pressure for the CO2? 2. Why when laying a bead the weld POP's? 3. On heavier material 1/8" and above, is it ok to do one continuos bead? Any other pointers you pro's /forums/images/graemlins/rolleyes.gif /forums/images/graemlins/grin.gif, could pass along to a brotha?