钢结构焊接接头组织特征与碳元素分布研究  

Microstructure and Carbon Distribution of Welded Joint of Steel Structure

作　　者：汤振兴[1] 闫芳[1] 刘继鹏[2] 

机构地区：[1]郑州航空工业管理学院,河南郑州450000 [2]河南工程学院土木材料工程学院,河南郑州450001

出　　处：《铸造技术》2017年第6期1438-1440,1446,共4页Foundry Technology

摘　　要：采用手工电弧焊对园林钢结构进行了对接焊接处理,研究了焊接态、时效态和蠕变态焊接接头显微组织和碳元素分布的演变规律。结果表明,焊接状态下A402侧的碳含量要明显高于钢结构母材,且碳含量的峰值出现在距离熔合线2.5μm处的A402焊材侧。时效处理后钢结构焊接接头A402侧、熔合线和母材处都没有发现淬火马氏体的存在,相对于焊接状态下,A402侧和钢结构母材侧的碳浓度分布更加均匀,A402侧的碳含量基本在0.16%附近,而母材侧碳含量基本在0.13%附近,碳含量的峰值从0.19%增加至0.31%。在对园林钢结构进行焊接过程中,熔合区附近的碳元素扩散和迁移程度以及碳元素峰值含量主要与受热的时间有关。The butt welding process of steel structure was carried out by manual arc welding, and the evolution of microstructure and the distribution of carbon element in the welded joint were studied. The results show that the carbon content of A402 side of the welding consumables is higher than that of the parent material under the condition of welding steel structure, and the peak of the carbon content is in 2.5μm far from the fusion line at the A402 side. After aging treatment, the quenched martensite is not fbund in microstructure at A402 side, fusion line and the base metal, the distribution of carbon concentration in the A402 side and the steel base metal side is more uniform, the carbon content in the A402 side is about 0.16%, and the carbon content of base metal side is about 0.13%, the peak carbon content increases from 0.19% to 0.31%. In the welding process of steel structure, carbon diffusion ＆ migration and carbon content peak in the fusion zone are mainly related to heating time.

关 键 词：钢结构 手工电弧焊 组织 碳元素分布 

分 类 号：TG444.1[金属学及工艺—焊接] TU758.11[建筑科学—建筑技术科学]