摘要
结合铝合金车体头车底架边梁焊接结构的特点,分析了边梁在焊接过程中容易出现的裂纹和气孔等焊接缺陷产生的原因。打底焊裂纹是由于打底焊焊缝有效承载面积较小,不足以承受焊后较大的应力所致,通过采用"厚壁保强"法,解决了此问题。气孔主要是由于焊接区域空气湿度较大以及空气不清洁所致,通过控制焊接时间和焊接区域的环境状况,并采用"集中排除法",使气孔以链状形式产生并集中清理干净,解决了在湿度较大环境下,焊接中极易产生的超标气孔问题,使边梁焊接的成功率大大提高。
The welding defects such as crack and porosity were analyzed aiming at the welding construction character istic of aluminum alloy longitudinal girder.Effective loading section area of backing weld was too small to stand larger stress after welding,which caused the crack.And the crack problem was solved by enlarging backing welding section area.The porosity was caused by the high humidity and no cleaning air on the welding area,and the crack can be solved by controlling welding time and environment condition.Also,porosity can take place in the form of linear porosity and be removed.
出处
《热加工工艺》
CSCD
北大核心
2011年第13期144-147,共4页
Hot Working Technology
关键词
高速列车
铝合金焊接
焊接缺陷
焊接应力
high speed railway vehicles
aluminum alloy welding
welding defects
welding stress
