Techniques for Automatic Autogenous Welding of Low Sulfur 316LN Beam Tube
Leaks and questionable penetration were found in some autogenous machine welded joints between the RHIC beam tube and flange located in the interconnect region. This investigation found the leaks were caused by hot cracking resulting from complications in welding low-sulfur, low-ferrite stainless steel. The marginal penetration is attributed to the joint design and the low sulfur content of the beam tube. Both problems are corrected using the same welding machine with specific electrode placement relative to the joint, and the addition of hydrogen to the shield gas. Repairs only should be accomplished with the addition of filler metal.
KeywordsFiller Metal Stainless Steel Weld Heat Input Weld Ferrite Number AISI Type
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