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Weld joint strength reduction factor for 16-8-2 weld metal

Weld joint strength reduction factor for 16-8-2 weld metal

Weld joint strength reduction factor for 16-8-2 weld metal

(OP)
Hello all,
B31.3 sec. 302.3.5 and 304.1.2 have weld joint strength reduction facotr W to reduce the allowable stress for high temperature service. I have a 48" stainless steel 304H welded duct at design temperature 1450 degF. If I use 16-8-2 weld metal instead of 308H weld metal, can I take W=1 for thickness and pipe stress analysis ?

RE: Weld joint strength reduction factor for 16-8-2 weld metal

Nope. The "H" in 304H is high-carbon, to improve the high-temp strength. If you are REALLY trying to work to ASME B31.3, use the ASME Sect II C properties, and take the B31.3 temperature derate, per the table in the back of 31.3.

You may be able to claim "W = 1", but you have to do your homework.

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