In the field welding repair manner of the die pressure-resistant aspect such as

摘要

PROBLEM TO BE SOLVED: To provide a repair method by field welding by which thermal strain has been made within an allowable limit and hardness has been made within the one by which a build-up welding part can be machined on the spot at the time of repair by the field welding of the pressure-resistant surface of the die of a metal product stock manufacturing machine, etc., such as a sheet metal press, etc. ;SOLUTION: The upper layer of a base material surface to be repaired, consists of a base layer of a build-up welding part, an intermediate layer and a surface layer. After completing all the build-up welding processes, for the surface layer, a machining process machining by a portable system cutting machine is provided. An operation is performed so that the surface of the residual part of the surface layer becomes a finished surface. For stainless steel build-up welding, low temperature welding is adopted, and welding is performed for each block formed by dividing all the areas into at least four sections or over. For the base layer, a soft steel-based welding rod is used, and for the intermediate layer, 13 chrome-based stainless steel welding rod containing niobium is used. At the time of welding for each block, after making the block orthogonally cross an adjacent block by 90°, and for an order for welding for each block, detached blocks are welded by skipping other blocks. For the surface layer, a welding rod containing 1 to 3% nickel to 13 chrome or a silicon-based stainless steel welding rod is used.;COPYRIGHT: (C)2000,JPO