Im welding up a cart for my MM180 using 1 x 1 x 0.063 sq tube, with 0.030 wire, they gave me with the machine. I have it on auto set, the problem I had with one of the connections, there was a 1\8 gap, when I went to weld it up I burned a hole in the tubing, it got pretty ugly. How do I prevent this from happening? Thanks for your advice.