Aimed at wear and crack failure problems in the surface and inside of the mould caused by thermal shock environment and alternating load under long-term service

the laser welding technology was used to repair and maintenance of A-MAX steel mold appearing the crack and wear

and microstructure

tensile and fatigue performance of the mould repaired were analyzed.The results indicate that in the welding seam of laser welded joint

there exists small amount of plate strip martensite and some white ferrite phase distributed along the grain boundary joint

and in heat affected zone

the mechanical mixture of white ferrite and black pearlite microstructure appears.After laser welding

the tensile strength and elongation of the mold reach 93.95% and 88.92% of those of a new A-MAX mold

and the fatigue life of the mold after repairing can be improved obviously

of which the fatigue cycles are nearby the same order of magnitude as that of new mold.