电焊机2024，Vol.54Issue(8)：119-128,10.DOI:10.7512/j.issn.1001-2303.2024.08.16
430铁素体不锈钢薄板激光焊接背面飞溅和熔池动态的数值模拟
Numerical Simulation of Back Spatter and Weld Pool Dynamics in Laser Welding of 430 Ferritic Stainless-steel Thin Plate
高天 1赵朋成 1燕国帅 1王自强 2景水秀 2赵振辉 2刘君2
作者信息
- 1. 青岛科技大学 机电工程学院,山东 青岛 266061
- 2. 青岛海尔洗涤电器有限公司,山东 青岛 266426
- 折叠
摘要
Abstract
Since a small deviation in the off-focus value can lead to an unstable weld pool,the laser welding of thin plates is highly susceptible to this parameter.Based on numerical simulation,effects of off-focus on the dynamic behaviors of the weld pool in laser welding of 430 ferritic stainless-steel plates in 0.6mm thick were investigated.The reasons behind the for-mation of spatters on the back of the weld bead were examined.The results show that the position and distribution of laser heat input in the weld pool are primarily determined by the off-focus.As the off-focus value decreases,the keyhole in the weld pool gets deeper.A negative off-focus(-0.1 mm)creates a fully penetrated keyhole,while zero(0 mm)and positive(0.01 mm)off-focus creates smaller keyholes.All off-focuses form weld pools with a same waist structure,and the maxi-mum flow velocities are observed on the surfaces of the weld pool and keyhole.Two eddy currents flowing from the middle waist to the upper and lower surfaces exist in the weld pool,and the molten metal on the upper surface of the weld pool flows forward from its rear to its front.Due to the evaporation force and high surface flow velocity,the keyhole continu-ously seals off in its middle,leading to closed bubbles at the bottom.Only negative off-focus causes back spatter,while zero and positive off-focus do not cause it.In the case of negative off-focus,small droplet spatters form on the back of the weld during the initial formation of the weld pool,chiefly caused by the gravity and surface flow.Jet spatters resembling large par-ticles are formed due to bubble rupture during the final stage of the formation of the penetrated keyhole.There is a relatively stable shape and flow of the weld pool in the case of positive off-focus,and the predicted profile of the weld bead on the cross-section is in good agreement with the experimental results.关键词
激光焊接/铁素体不锈钢/离焦量/熔池动态/背面飞溅Key words
laser welding/ferritic stainless-steel/off-focus/weld pool dynamic/back spatter分类
矿业与冶金引用本文复制引用
高天,赵朋成,燕国帅,王自强,景水秀,赵振辉,刘君..430铁素体不锈钢薄板激光焊接背面飞溅和熔池动态的数值模拟[J].电焊机,2024,54(8):119-128,10.
