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Proximity of Welds to Avoid HAZ?

Proximity of Welds to Avoid HAZ?

Proximity of Welds to Avoid HAZ?

(OP)
Hi guys.  I hope you are all well and enjoying the New Year.

I have a question.  I know there is a rule of thumb for this but I can't remember it.  How far apart do two adjacent pipe welds need to be in order to provide adequate separation between the two HAZs of the two welds?  I seem to remember 2" being the rule of thumb.

Application:  I have a 36" 316L sch 40S pipe that has a full encirclement split repad to provide reinforcement at an anchor.  The repad is fillet-welded to the pipe at its two ends and also longitudinally to join the two halves.  There is a fitting buttweld very close to one of the end fillet welds, i.e. the repad fillet weld is close to the fitting buttweld.  I believe the two welds need to be at least 2" apart but I would like to hear what you think.  This is a 31.3 system, if that matters.  Thank you!!!

RE: Proximity of Welds to Avoid HAZ?

Two inches would do in most cases, but it really should be based on the wall thickness of the pipe (such as 2 x WT) as that affects the dimension of the bevel and hence the distance you would want to maintain from the usual butt weld that you are adjoining.

From "BigInch's Extremely simple theory of everything."

RE: Proximity of Welds to Avoid HAZ?

(OP)
Thanks BI!

RE: Proximity of Welds to Avoid HAZ?

With both welds being on pipe -- open root & from the OD;  keep the caps 3/8 inches or farther apart, edge-to-edge.  Might be a little less than 2-inches c-to-c on STD-wall pipe.

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