Posted by Jim on 10/11/2006, 2:16 pm, in reply to "chomoly"
138.162.5.9
Hi Eric-What type of CrMo your are working. What percent of Cr and percent Mo is this? Is this pipe, tube, plate, or cast metal and how thick are the items. What joint design are you working and will this be full or partial penetration weldments? What is the final product used for?
Do you have only a few small welds to make or many linear feet of welding to complete? Can you handle welding 'in place' all positions, or can you move the work about for flat? Full pene welds of pipe/tubes often requires internal shielding with argon and you need it for any TIG welding of CoMo. Depending of the filler best selected for GMAW of your CrMo, you may need argon shielding gas or a blended shielding gas. Air cooled TIG is limited to about 140 amps. Thats great for thin or thick items when you place well made welds 1 or 2 layers or as many layers as needed (somewhat slow). MIG works great and faster if items is slighly thicker and even plain old thick. Still may take many layers and you always must keep it dry & clean prior to, during, and after welding for best results. Pre-heat needs, inter-pass limits and post welding temperature controls need your input buddy.
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