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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 garden steel was carried out by hand arc welding. The evolution of microstructure and carbon distribution in welded, aged and creep welded joints was studied. The results show that the carbon content of A402 side is obviously higher than that of steel structure base metal and the peak of carbon content appears on the side of A402 welding consumables which is 2.5μm away from the fusion line. After aging treatment, no quenched martensite was observed on the A402 side, the weld line and the base metal of the welded joints of steel structure, the carbon concentration distribution on the A402 side and the base metal side of the steel structure was more uniform than that on the welded side, The carbon content was almost 0.16%, while the carbon content of the base metal was almost 0.13%, and the peak of the carbon content increased from 0.19% to 0.31%. During the welding of garden steel structure, the diffusion and migration of carbon in the vicinity of the fusion zone and the peak content of carbon are mainly related to the time of heating.