摘要
通过对厚度为8 mm的2219铝合金横焊过程中的高速摄像观察及典型接头金相分析研究,阐述了横焊接头典型咬边及气孔缺陷成形机理。结果表明,横焊过程中,小孔熔池形成过程中受力的平衡与稳定,是焊缝成形的前提与基础;焊缝背面受力失衡且金属流动性差是造成背面咬边缺陷的原因;在电弧力及熔池重力的共同作用下,金属湿润铺展受到阻碍是焊缝正面咬边缺陷的成因;重力向下,浮力向上,熔合线附近冷却速度较快,导致气孔来不及逸出而在焊缝上侧聚集。
Through high speed camera observation and typical metallographic analysis of 8 mm 2219 aluminum alloy, the typical undercutting and stomatal forming mechanism of transverse welding joint are described. The results show that balance and stability of force during the process of the formation of the small hole molten bath are the prerequisite and foundation of weld forming. The imbalance of the weld on the back of the weld and the poor metal flow are the causes of the backside undercut defects. The pool of gravity under combined action of metal wetting is hampered by the weld is the cause of the front edge of the defect;gravity down, buoyancy up, near the melting line cooling faster, resulting in the pores to escape and in the weld side gather.
作者
孙世烜
高彦军
苏志强
毕煌圣
刘西伟
杜宪策
SUN Shi - xuan GAO Yan- jun SU Zhi - qiang BI Huang - sheng LIU Xi - wei DU Xian - ce(Capital Aerospace Machinery Corporation,Beijing 100076,China)
出处
《压力容器》
2017年第10期8-13,共6页
Pressure Vessel Technology
基金
国家自然科学基金资助项目(51375150
51205114)
关键词
咬边缺陷
气孔缺陷
受力平衡
焊缝成形
bite edge defects
blowhole defects
force balance
joint interface
