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Application of weld metal build up
2

Application of weld metal build up

Application of weld metal build up

(OP)
Which would have the least amount of residual stress when applying weld metal build up to an exterior area of a pipe, longitudinally or transversely?

RE: Application of weld metal build up

Circumferential welds cause residual stresses in a small area.  Longitudinal welds cause residual stresses to be spread over a larger area.

The orientation of the residual stresses must be compared to the imposed stress orientation of the pipe to see if they create a critical condition.  You also have to consider restraint conditions.  Circumferential welds have a greater tendency to be affected by longitudinal restraint.

RE: Application of weld metal build up

If you have to use longitudinal welds on a round object you will have to deposit weld beads 180° apart, preferably with two welders, to keep from bending the pipe or tube.  CS not so much, but with SS it can be a big problem.



 

RE: Application of weld metal build up

If it's to build up a patch of corrosion, both directions in a 'basket weave' sequence.  

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

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