摘要
对小直径低合金管材进行全位置TIG对接焊工艺试验,分析其工艺特点及焊接接头组织与力学性能。分析认为:焊接工艺参数需要根据熔池的受力特点分区段进行设置,以获得合适的熔池大小,达到熔池各作用力之间的合理匹配,从而获得良好的焊缝成形。焊缝组织为铁素体和粒状贝氏,热影响区各区组织不同,熔合区及粗晶区为粗大的粒状贝氏体,相变重结晶区组织为贝氏体以及细小均匀的铁素体。不完全重结晶区为铁素体、珠光体和贝氏体。焊接接头各区域硬度相差不大,拉伸、弯曲以及抗内压性能满足相关标准要求。
All position TIG butt welding process test of small diameter low alloy tubing was carried out.The process characteristics,microstructure and mechanical properties of welded joint were analyzed.According to the analysis,the welding process parameters should be set in different sections according to the stress characteristics of the weld pool,so as to obtain the appropriate size of the weld pool and achieve the reasonable matching between the forces of the pool.The microstructure of the weld is ferrite and granular bainite.The microstructure of heat affected zone is different.The fusion zone and coarse grain zone are coarse granular bainite,and the fine-grained region zone is composed of bainite and fine and uniform ferrite.The incomplete recrystallization region is pearlite,ferrite and bainite.The hardness of each area of the welded joint has little difference,and the tensile,bending and internal pressure resistance meet the requirements of relevant standards.
作者
胡德虎
李博锋
Hu Dehu(Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,Shaanxi,China;Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods,Baoji 721008,Shaanxi,China)
出处
《机械制造文摘（焊接分册）》
2020年第4期25-30,共6页
Welding Digest of Machinery Manufacturing
关键词
低合金钢
管材
焊接
对接接头
组织
力学性能
low alloy steel
tubing
welding
butt joint
microstructure
mechanical properties
