METHOD FOR REPAIRING CORROSIVE REDUCTION ON INSIDE SURFACE OF LARGE VERTICAL CYLINDRICAL VESSEL BY BUILD-UP WELDING IN INSTALLATION SITE OF VESSEL

摘要

PROBLEM TO BE SOLVED: To provide a repairing method of corrosive reduction on the inside surface of a large vertical cylindrical vessel by build-up welding in the installation site of the vessel. SOLUTION: The corrosive reduction part on the inside surface of the large vertical cylindrical vessel is repaired by build-up welding with stainless steel by a downward CO2gas shielded arc welding process using a flux cored stainless steel wire and accompanied by horizontal oscillation or a horizontal oscillation downward MAG welding process using gaseous argon and CO2gas in the installation site of the vessel. By this invention, the smoothness of the surface of the build-up welding, results having no problem in any of the depth of penetration, ferrite content in the weld bead, the investigation of surface defects and the residual strain in the peripheral direction are obtained. COPYRIGHT: (C)2005,JPO&NCIPI