- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Numerical Simulation on Laser Welding considering Surface Deformation and Convective Heat Transfer
摘要： Laser welding requires much capital investment comparing with generally employed arc welding. However, the laser welding enables to join very small objects with high accuracy because the laser has high energy density and high controllability. In addition, it is possible to suppress welding deformation due to low heat input. Therefore, the laser welding is employed for various joining processes. This study aims to clarify formation mechanism of weld pool in laser cladding in order to improve incomplete fusion through numerical simulation on laser welding considering deformation of weld pool surface and convective heat transfer in it. Consequently, it was found that the gas pressure plays important role for improve incomplete fusion in laser welding. The higher pressure of gas increases penetration depth by pushing away molten metal at center of the weld pool without changing direction of convection.
关键词： Laser Welding,Simulation,Convective Heat Transfer,Surface Deformation
更新于2025-09-11 14:15:04
-
Influence of electrodeposited Cu-Ni layer on interfacial reaction and mechanical properties of laser welded-brazed Mg/Ti lap joints
摘要： A fiber laser welding-brazing procedure has been developed for joining AZ31B magnesium alloy to Cu-Ni coated Ti-6Al-4V titanium sheet using AZ92D filler wire. The effect of the interlayer arrangements (AZ31B/Ni-Cu/Ti-6Al-4V and AZ31B/Cu-Ni/Ti-6Al-4V) on appearance, interfacial reaction and mechanical properties were investigated at different heat input. It was found that the feasibility of this process depends strongly on the pre-existing Cu-Ni layer on the Ti surface that promotes wetting of the AZ92 filler. Within the range of 1200–1600 W, defect free joints in both interlayer arrangements. Depending on the interlayer arrangements chosen, different reactions layers formed inside the joint region. Nevertheless, at optimum heat input (1400 W), Ti2Ni mingled with Ti3Al interfacial reaction products was produced along the fusion zone (FZ)-Ti brazed interface in both interlayer arrangements. The tensile-shear fracture load of the joints produced at the optimum laser power reached a maximum value of 2016.5 N for AZ31B/Ni-Cu/Ti-6Al-4V and 2014.6 N for AZ31B/Cu-Ni/Ti-6Al-4V, representing an efficiency of 71% compared to AZ31B alloy. Under suitable heat input, the joints failed at the fusion zone of the AZ31B base metal. In contrast, incomplete brazing or large volume of intermetallics at the brazed interface resulted in interfacial failure at lower/higher heat input.
关键词： Laser welding-brazing,Mg alloy,Intermetallic compounds (IMCs),Ti alloy,Microstructure
更新于2025-09-10 09:29:36