Transactions of Materials and Heat Treatment

Title：Process study on overlaying welding repair of 5CrNiMo hot-working die

Authors： AI Ming-ping1 LAI Ke-xian2(1.Chongqing Changzheng Heavy Industry Co. Ltd. Chongqing 400083 China 2.China CTDI Engineering Corporation Chongqing 400039 China)

Unit：

KeyWords： hot-working die invalid cavity overlaying welding repair

ClassificationCode：TG455

year,vol(issue):pagenumber：2009,34(4):114-116

Abstract：

Carbon arc air gouging and sanding cleaning was conducted to the fatigue layer and crack of the invalid cavity of the hot-working die,the mould was warmed up to 450 ℃ for 10 h,then overlaying welding repair was performed using DC of 200 A and EUREKA electric welding rod with the diameter of 4.8 mm,subsequently,heat preservation was done in 450 ℃ for 3 h before slowly cooling it to room temperature in the furnace.Furthermore,the mould was tempered by heat preserving in 550 ℃ for 10 h before cooling it to 200 ℃ in the furnace.Then it was taken out,covered by heat preserving cotton and slowly cooled to room temperature,afterwards,the second temper was performed using the same temper process.The surface rigidity of the cavity's overlaying welding layer was 51-52 HRC.The above process can increase the hot strength,hot hardness and thermal fatigue performance of the mould cavity,and prolong the life-span of the mould.

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Reference：

[1]中国机械工程学会焊接学会.焊接手册:第1卷[M].北京:机械工业出版社,1992.
[2]张文钺.焊接冶金学[M].北京:机械工业出版社,2006.
[3]刘云旭.金属热处理原理[M].北京:机械工业出版社,1981.

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