ALrighty I misspoke I am a bit lethargic and ignorant of my alloys....generally I just go with whatever the spec they ask for requires.
I heard it called that (chrome moly) and I went with it....its amazing how easy it is for ignorance to perpetuate but difficult for knowledge to survive intact. However I am not alone in this:
http://www.lincolnelectric.com/knowledge/articles/content/chrome-moly.asphttp://files.aws.org/wj/2006/12/wj200612/wj1206-24.pdfhttp://www.aircraftspruce.com/menus/search.php?sec=&s=4130But I still need somone to shine some light into why this problem is occurring ....it is a real headache, slows us down a lot and it reduces the quality of the finished product. I keep thinking the tube we are using is contaminated...I find a lot of pits in it from time to time....however my hands are tied on the material because it has been "certified". I intend to experiment with some subtle preheat next week, but other stratigies and ideas are most welcome on this subject.