L415QB+316L复合管焊接裂纹分析  

Analysis on Welding Crack of L415QB+316L Composite Pipe

作　　者：王斌[1] 朱洪亮[1,2] 王维[1] 朱家祥[1] 周翠[1] 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500 [2]川庆油建工程技术开发培训中心,四川成都610213

出　　处：《热加工工艺》2014年第1期193-196,共4页Hot Working Technology

摘　　要：针对L415QB+316L复合管焊接接头封焊难以控制,熔合区易出现裂纹这一问题,利用光学显微镜和扫描电镜,观察分析了接头熔敷金属和裂纹区的组织和成分变化,探究了其对裂纹生成的影响。结果表明,淬硬组织、氢、异种钢接头处的复杂应力状态导致了裂纹的形成。通过采用多层预热、焊后空冷、严格控制层间温度等工艺措施,增强组织的均匀性,可以有效防止焊缝中的冷裂纹产生。For the problem that L415QB＋316L pipe welding of sealing braze is hard to control and the fusion zone is easy to crack, the optical microscope and scanning electron microscopy （SEM） were used to analyze the microstructure and composition change of the deposited metal and crack area, and the influence on the crack formation was explored. The results show that the hardened structure, hydrogen and the complex stress state of dissimilar steel joint lead to the formation of cracks. By using multilayer preheating, air cooling after welding, controlling the interpass temperature process strictly, the uniformity of microstructure can be enhanced, ant then the cold crack in the weld seam can be effectively prevented.

关 键 词：复合管 焊接工艺 裂纹 

分 类 号：TG444[金属学及工艺—焊接]