
ASME B31.3 Background on Weld Joint Strength reduction Factors
The weld joint strength reduction factors added in the 2004 edition were based on those provided in ASME BPVC Section IH, Subsection NH. Weld metal, base metal and cross-weld creep rupture data had been used to develop weld joint strength reduction factors in Subsection NH for limited material combinations. The basic weld joint strength reduction factors provided in ASME B31.3 were developed based on evaluating the factors provided in Subsection NH. Factors for 100,000 hour d