电焊机2024，Vol.54Issue(10)：61-69,9.DOI:10.7512/j.issn.1001-2303.2024.10.07
装配间隙对铝合金激光-电弧复合焊接头成形及气孔的影响研究
Study on the Effect of Assembly Gap on the Formation and Porosity of Laser-Arc Hybrid Welded Joints in Aluminum Alloys
摘要
Abstract
Laser-arc hybrid welding with a laser leading method was employed to conduct welding tests on the 6082-T6 alu-minum alloy lock-bottom joints commonly used in high-speed train bodies.By varying the size of the horizontal and vertical gaps,the effects on weld formation,penetration depth,weld width,and porosity were studied,and validated using the Fluent numerical simulation software.The results indicate that as the horizontal gap increases,both the penetration depth and weld width of the welded joint show a trend of gradual increase.In particular,when the horizontal gap increases from 0 mm to 1.2 mm,the penetration depth and the lower weld width increase from 5.91 mm and 1.65 mm to 6.45 mm and 2.46 mm,respec-tively,mainly due to the increase in laser welding heat input.Additionally,the joint porosity shows a trend of first decreasing and then increasing.When the horizontal gap is 0.7 mm,the porosity reaches a minimum of only 9.21%,which is lower than 10.86%with no gap and 12.61%with a 1.2 mm gap.This indicates that a certain horizontal gap size is beneficial for improv-ing the stability of the keyhole,while an excessively large horizontal gap size may cause the keyhole stability to deteriorate.Moreover,with the increase of the vertical gap,although there is no significant change in the penetration depth and weld width of the joint,the porosity shows a continuous increasing trend,from 10.86%to 15.85%,indicating that the presence of a vertical gap is not conducive to maintaining the stability of the molten pool keyhole.The optimal assembly gap size is:0.7 mm horizontal gap and 0 mm vertical gap.This study will provide process guidance for achieving high-quality welding of aluminum profiles for high-speed trains using laser-arc hybrid welding technology,and expand the application range of laser-arc hybrid welding in related fields.关键词
激光-MIG复合焊/装配间隙/焊缝成形/气孔率Key words
laser-MIG hybrid welding/assembly gap/weld formation/porosity分类
矿业与冶金引用本文复制引用
马寅,马国龙,王尉,刘福运,韩晓辉,檀财旺..装配间隙对铝合金激光-电弧复合焊接头成形及气孔的影响研究[J].电焊机,2024,54(10):61-69,9.基金项目
国家重点研发计划(2023YFB3407800) （2023YFB3407800）
