Discussion on prevention and treatment of root weld defects of T-joint with permanent backing in GMAW

基于GMAW带永久衬垫T形接头根部焊接缺陷的防治 Discussion on prevention and treatment of root weld defects of T-joint with permanent backing in GMAW 白晓良 BAI Xiaoliang 1 first-author 闵晓峰 MIN Xiaofeng 1 李亚丽 LI Yali 1 莫芝林 MO Zhilin 1 武汉一冶钢结构有限责任公司 武汉一冶钢结构有限责任公司 Wuhan Yiye Steel Structure Co.,Ltd. Wuhan Yiye Steel Structure Co.,Ltd. 采用GMAW(熔化极气体保护焊)焊接箱形梁柱结构大间隙带永久衬垫T形接头时,由于焊接结构设计、焊接参数、焊接手法不当等原因,导致焊缝根部容易出现大量的未熔合、固体夹杂、焊接裂纹等缺陷。采用不同的焊接工艺参数进行焊接试验,分别从宏观金相和微观金相分析焊接缺陷和组织,探讨缺陷产生原因,提出几种经验证有效的防治措施。对构件坡口形式的设计、焊接衬垫的加工以及构件的焊接工艺具有一定的指导意义。 When using GMAW（gas metal arc welding）to weld large gaps with permanent backing T-joint in the box-shaped beam-column structures,due to improper welding structure design,welding parameters and welding techniques and other reasons,a large number of incomplete fusion,solid inclusions,cracks and other defects appear in the root of weld.In this paper,welding tests are conducted with different welding parameters,the welding defects and microstructures are analyzed from the macroscopic metallographic phase and microscopic phase respectively,the causes of the defects are discussed and several proven effective preventive and treated measures are further proposed,which has certain guiding significance for the groove form design and welding technology of components and the processing of the welding backing. 熔化极气体保护焊 永久钢衬垫 根部未熔合 工艺措施 GMAW steel backing lack of fusion in root process measures TG441.7 2022-03-08 12 50