Application of weld metal build up 2

[boiseqc]

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?

 

[desertfox]

Hi boiseqc

Try this site:-

http://www.welding-technology-machines.info/welding-distortion/calculation-of-shrinkage.htm

Your shrinkage will depend on a number of issue's without which I cannot comment further.

desertfox

 

[Ron]

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.

 

[unclesyd]

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.

 

[SJones]

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