DH36水下湿法焊接接头组织和力学性能分析  

Analysis on microstructure and mechanical properties of DH36 underwater wet welding joints

作　　者：黄江中[1] 高文斌[2] 赵翠华[1] 许威[1] 曹军[1] 李连波[1] 

机构地区：[1]海洋石油工程股份有限公司,天津300452 [2]天津大学材料科学与工程学院,天津300072

出　　处：《电焊机》2014年第6期107-112,共6页Electric Welding Machine

摘　　要：潜水焊工在水深2 m的水池里,使用水下专用焊条进行DH36试板湿法焊接试验。根据AWS D3.6:2010,对所得到的焊接接头进行焊接工艺评定,并分析其组织及潜在缺陷。结果表明:湿法接头的外观检测、X射线检测、拉伸试验、弯曲试验、冲击试验和宏观试验均满足AWS D3.6:2010 B级接头要求,盖面焊缝的过热区最大硬度值微超出标准规定的上限,其组织主要为粗大马氏体,而打底焊缝的热影响区由于后续焊道的再热作用,组织为回火马氏体。在盖面焊缝下方左右热影响区容易出现氢致裂纹,可通过使用step-back运条手法来解决。DH36 test plates were wet welded using underwater special electrode by underwater welders at the pool of a depth of two meters. The resultant welding joints was for welding procedure qualification according to AWS D3. 6：2010 and to analyze the microstructures and potential defects. The results showed that,visual inspection and X - ray detection,tensile test,bending test,impact test, the macro test met the requirements of AWS D3. 6：2010 class B joint. Maximum hardness value of overheated zone in the cap weld was beyond the standard micro - cap,the microstructure of coarse martensite mainly,while overheated zone of backing weld becomes tempered martensitedue to subsequent weld reheat role. Also pointed out that HAZ around the bottom of the cap weld is prone to hydrogen induced cracking,and the problem can be solved using the step - back techniques.

关 键 词：DH36 水下湿法焊接 力学性能 组织 氢致裂纹 

分 类 号：TP456.5[自动化与计算机技术]