WELDING METHOD UTILIZING MALTENSITE TRANSFORMATIONAL EXPANSION

摘要

PROBLEM TO BE SOLVED: To improve fatigue strength and also to prevent a weld crack by easily converting high tensile residual stress unavoidable in a welded structure into compressive residual stress without using a complicated welding process.;SOLUTION: Welding for melting a welding material is performed with high efficiency and stability by using weld metal which contains Ni and Cr and in which maltensite transformational expansion is finished at a nearly room temperature at which welding is completed and by using a welding means having a stable heat source such as submerged arc welding which generates an arc in the inside of flux, whereby the introduction of compressive residual stress by maltensite transformational expansion is utilized and fatigue strength of a weld zone is improved by the stress ratio effect.;COPYRIGHT: (C)2002,JPO