Heat EX tubesheet to shell weld repair
Heat EX tubesheet to shell weld repair
(OP)
I've been tasked with correcting a leaking Struthers Wells heat exchanger. The problem is the tube sheet (SB-171) to shell (sa-516) weld is leaking, and appears to be a result of welding two dissimilar metals. The Mechanical Engineers think an appropriate fix would be to weld a carbon band around the shell over the existing weld bead (fillet and plug welds) to establish a carbon to carbon weld. I believe re-welding to be another option not yet considered. Would re-welding be a long term, cost effect, and viable solution? Any advice would be GREAT!





RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
RE: Heat EX tubesheet to shell weld repair
The secret in your case is to make sure you have as much of residual weld cleaned off unless the existing filler metal is completely bounded to base metals. If there is any doubt take it off. When taking off the existing filler metal don.t dig cavities in the base metal. Over the years I've found out that a well directed chipping gun will strip most of the filler off if there is a lot of lack of fusion.
I would take the time to find a welder who can show their ability to handle Cu alloys.
Conforms to Class CuAl-A2 of Specifications ASME-SFA-
5.6; ASME-SFA-5.7*; AWS-A5.6; AWS-A5.7*, AWS-A5.13*;
MIL-E-23765/3A*.
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RE: Heat EX tubesheet to shell weld repair