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高强钢旁路热丝等离子弧打底焊接头组织和性能
苗玉刚, 马照伟, 赵慧慧, 杨晓山, 刘吉
作者单位E-mail
苗玉刚, 马照伟, 赵慧慧, 杨晓山, 刘吉  miaoyg@hrbeu.edu.cn 
摘要:
采用旁路热丝等离子弧焊接工艺进行高强钢Y形坡口的打底焊,该工艺有效结合了等离子弧穿透能力强、电弧热丝熔敷效率高、旁路分流热输入可控的技术优势,对中厚高强钢板实现单面焊接双面成形. 结果表明,正面焊缝成形美观,无焊接缺陷;背面焊缝轻微突出,厚板完全焊透;经过反复的受热冷却,打底焊焊缝的微观组织得到细化.力学性能分析得出,热影响区硬度最低,焊缝区略高于母材区;打底焊焊缝的硬度高于填充焊和盖面焊;拉伸断裂发生在母材区,断口扫描出现韧窝,为韧性断裂.
关键词:  高强钢打底焊|旁路热丝等离子弧焊|微观组织|力学性能
DOI:10.12073/j.hjxb.2019400020
分类号:
基金项目:
Microstructure and performance of backing welding joint of high strength steel by bypass-current wire-heating PAW
MIAO Yugang, MA Zhaowei, ZHAO Huihui, YANG Xiaoshan, LIU Ji
Abstract:
The backing weld of high strength steel with Y groove was achieved by means of bypass-current wire-heating PAW, which had advantages of high melting efficiency of wire-heating, strong penetration ability of PAW, controllable heat input of bypass-current arc. One-side welding with back formation of medium and heavy plate was realized by this method. The results indicated that the plate was full penetrated and the weld formation was sound without welding defect. The microstructure of the back weld was refined after reheating effect in the subsequent multi-layer and multi-pass welding. The hardness of the weld zone was slightly higher than that of the base metal, and the hardness of heat affected zone was lowest. The hardness of the weld zone decreased gradually from root bead to top bead. Tensile test results showed that ductile fracture occurred in the base metal and the characteristic of fracture appearance was dimple.
Key words:  high strength steel backing welding|bypass-current wire-heating PAW|microstructure|mechanical property