WELDING METHOD OF HIGH-PURITY FERRITIC STAINLESS STEEL

摘要

PURPOSE:To prevent generation of a crack in a weld metal even in welding of a thick-walled material by incorporating hydrogen into a welding wire at a specific rate and preheating the part to be welded to a specific temp. CONSTITUTION:The steel to be welded is a high-purity ferritic stainless steel contg. 16-32% Cr and in the stage of welding, the part to be welded is preheated to >=50 deg.C to accelerate the release of hydrogen from the weld zone. The content of hydrogen in a welding wire is preliminarily adjusted to <=1.5ppm in addition to the preheating. The danger of generating a crack in ordinary TIG welding is substantially averted even if restraint is severe as in multi- layer butt welding.