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When do you desgin fillet weld or but weld

When do you desgin fillet weld or but weld

When do you desgin fillet weld or but weld

(OP)
Hi everybody,
We have tubing welded socket (fillet weld) with coupling.
Coupling and tubing were material TP 316L, YS = 41 KSI, TS = 87 KSI.
Welding consumable is ER316L, YS = 390 MPA, TS = 550 MPA.
This joint will be hydrotest at 4200 PIS.
Normally,I know that Fillet weld are designed for piping under the pressure maximum 400 PSI So with this joint socket, I am worried about its design. How can I prove that the design of this joint guarantees the above pressure.

RE: When do you desgin fillet weld or but weld

Socket welds are routinely used at pressures well above 400 psi. Calculated thickness of pipe and coupling rating define acceptability of design.

RE: When do you desgin fillet weld or but weld

One caveat from the above. If service is in high cyclic service, butt welds would be recommended.

RE: When do you desgin fillet weld or but weld

stanweld is right. If you have concerns of weld integrity a SW will not be able to be radiographed, a butt weld can. SW’s are cheaper and often are acceptable, but will only be able to be inspected via visual techniques.

RE: When do you desgin fillet weld or but weld

(OP)
Rating of Pipe and coupling have been designed at 6000 PSI. It mean that, this socket weld can be at pressure 4000 PSI when we carry out hydrotest.

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