摘要
采用激光-电阻复合焊接LF6铝合金,对焊接特性进行研究。通过激光和电阻热源相互作用,接头熔深和焊缝面积显著增加,实现了在小功率激光条件下铝合金熔透焊接,提高了焊接生产率,降低了焊接成本。与激光焊接相比,激光-电阻复合焊接铝合金接头中的气孔数量大幅下降。激光-电阻复合焊接的焊缝区的强化β(Al8Mg5)相弥散分布,呈铸态组织特征,热影响区(HAZ)的强化β相聚集长大。接头在焊缝断裂,呈韧性剪切断裂,平均抗拉强度可达292 MPa,约为母材的83.4%。
Laser-resistance hybrid welding is used to weld LF6 aluminum alloy plates and the process characteristics are analyzed.Thanks to the interaction between laser and resistance heat,the weld depth and cross section area increase evidently.The aluminium alloy joints with full penetration are achieved with low laser power,resulting in the welding efficiency increasing and production cost reducing.The amount of pore in hybrid welding joints decrease compared with that of laser welding.Microstructure observation indicates that the β（Al8Mg5） strengthen phase in weld zone is typical as-cast structure and dispersal distribution,and in heat-affected zone（HAZ） the β strengthen phase clusters grow up together.During tensile test,the hybrid welding joint ruptures at weld zone with ductile shear characteristic.The average tensile strength of hybrid welding joints is 292 MPa,about 83.4% of base metal.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第5期1404-1408,共5页
Chinese Journal of Lasers
基金
"十一五"装备预研项目(51318050)资助课题
关键词
激光技术
激光-电阻复合焊接
焊缝成形
气孔
抗拉强度
laser technique
laser-resistance hybrid welding
weld cross section
pore
tensile strength
