STRUCTURE IN WELDED JOINT OF HIGH CHROMINUM FERRITE STEEL

摘要

PROBLEM TO BE SOLVED: To obtain the welded part which has high toughness of the welded metal and small danger to brittle breakage and high reliability, in a high chromium ferrite high strength heat resistant steel having 10-13% Cr content. ;SOLUTION: In a welded joint structure for jointing the high chromium ferritic steel 1 having 10-13 wt.% chromium content with an arc welding, a primary layer 2 in a weld-joining part, is executed with an inert gas tungsten arc (TIG) welding method by using a welding material having the same component base as the base material having 10-13% chromium content. On and after the successive layer, the welded beads 3 are laminated with a protecting arc welding method for welding while shielding arc and welding metal from the atmosphere by using the welding material having 8.5-9.5% chromium content. Further, the welded bead is laminated so that the width of the last layer in the welded part widens at wider by ≥1 pass of the bead width than the width of just under the layer.;COPYRIGHT: (C)2000,JPO