I have welded for about 6 years now and today I came across a compressor that ate my lunch. It was a 14 ton compressor that was piped to anouther compressor. I could not get the equalizer tube welded to save my life. Heated the metal on the compressor to the point I could see it moving around, RED as fire, Silver rolled off it. Would not stick. I was using 15% silver. Same problems with 1 5/8" Suction and 1 1/8" High Side. What am I doing wrong? I got the equalizer tube closed up, but I would not want anyone to know it was me that welded it.. Looked like a buzzard took a dump on the pipe. Trane compressor and the connections look like steel? Never had this problem before. Am I using incorrect rod or what?