A508-3钢回火焊道接头组织和性能  

Microstructure and properties of A508-3 steel welded joint based on tempered bead technology

作　　者：唐威[1] Tang Wei(Shanxi Institute of Mechanical and Electrical Engineering,Changzhi 046011,Shanxi,China)

机构地区：[1]山西机电职业技术学院,山西长治046011

出　　处：《焊接》2021年第10期43-47,63,共6页Welding & Joining

摘　　要：文中针对A508-3钢,采用镍基合金焊条Ni690在其表面实施了异种材料的回火焊道焊接技术,分析了异种材料回火焊道焊接接头组织和性能,并与常规焊接工艺+590℃×2 h焊后热处理的焊接接头进行了对比。试验结果表明,常规焊接工艺+焊后热处理的接头硬度虽然粗晶区硬度明显降低,但是马氏体带的硬度降低不明显,而采用回火焊道焊接技术的焊接接头粗晶区和马氏体带的硬度均明显降低;回火焊道技术可以同时软化粗晶区和熔合区,其中粗晶区硬度约为热处理效果的73%~89%,但是获得的接头硬度均匀性更佳。从试验结果来看,能够免除焊后热处理的回火焊道焊接技术是大型结构部件焊接修复或制造时理想的焊接方法。Ni-based alloy electrode Ni690 was deposited on the surface of A508-3 steel with tempered bead technology for dissimilar materials,the microstructure and properties of the welded joint with temper bead was analyzed and compared with welded joint under conventional welding technology+590℃×2 h post weld heat treatment(PWHT).The result showed that the hardness of coarse-grained zone of welded joint under conventional welding technology+PWHT decreased obviously,but the hardness of martensite zone did not decrease obviously.The hardness of coarse-grained zone and martensite zone of welded joints with tempered bead technology was obviously reduced.The tempered bead technology could soften coarse-grained zone and fusion zone.Although the hardness of the coarse-grained zone was about 73%~89%that under heat treatment,the uniformity of joint hardness was better.From the test results,an ideal welding method for repair welding or manufacturing of large structures and avoiding PWHT was tempered bead technology.

关 键 词：A508-3钢 回火焊道技术 焊后热处理 异种金属焊接 马氏体带 

分 类 号：TG402[金属学及工艺—焊接]