Strength of 316FR joints welded by Type 316FR/16-8-2 filler metals

316FR鋼共金系及び16-8-2系溶接継手の強度

山下 拓哉  ; 永江 勇二 ; 佐藤 健一郎*; 山本 賢二*

Yamashita, Takuya; Nagae, Yuji; Sato, Kenichiro*; Yamamoto, Kenji*

316FR stainless steel is a candidate structural material of JSFR. Two types of weld metals are candidates for 316FR welded joints; 316FR weld metal and 16-8-2 weld metal. This study evaluated the need to consider the welded joint strength reduction factors in 316FR welded joints. To this end, the tensile and creep strengths of Type 316FR and Type 16-8-2 weld metals were measured, and the effect of delta-ferrite in weld metals was evaluated in creep-strength tests of 316FR welded joints. In tensile and creep strengths of 316FR joints welded by both metal types, the welded joint strength reduction factors were immaterial. The creep strength of 316FR welded joints was negligibly affected by delta-ferrite levels from 4.1 FN to 7.0 FN. Furthermore, the tensile and creep strengths of 316FR joints welded by two methods (Tungsten Inert Gas Welding and Shielded Metal Arc Welding) were the same.