Robustness of Weld Appearance on High-speed Arc-assisted Laser Welding Process on Titanium Sheet

doi:10.3901/JME.2021.10.137

Abstract

Abstract: The higher-precision nonlinear regression model of weld forming indices on different welding variables of autogenously penetration bead for two heat source modes laser leading and arc leading is established, targeting arc-assisted laser welding (AALW) of 0.5mm pure titanium TA2 sheet. The influence of AALW welding parameters variables on the stability of weld appearance for TA2 sheet is analysed. Results show that when using AALW high-speed welding, due to the disturbance and spreading effect of the rear TIG arc on the molten pool, the weld width on LL mode is larger than that of AL mode about 13.5%, meanwhile, the reinforcement is higher about7.5% than AL mode. For AL mode, solely changing one of the four major variables (the laser power P, the welding speed v，the welding current I and the distance between two heat sources D) has little effect on the weld appearance indices, while the variables’ interaction-terms (v×D, I×D, and P×D) have a greater influence on the weld appearance indices. For LL mode, weld appearance indices are significantly affected by the change of individual major variables, the effect of the variables’ interaction-terms is extremely insignificant. Considering the engineering application, the maximum the weld back width ratio (R_bw), minimum the weld width (W) and the root reinforcement (H₂) are taken as optimization targets, and the optimized welding parameter ranges under the two heat source modes are analysed. The weld back width ratio (R_bw) of the AL mode is about 12% higher than that of the LL mode, and the wide range of the optimized welding parameter variable range of the AL mode is 7% larger than that of the LL mode.

Key words: arc-assisted laser welding, titanium sheet, high speed welding, weld appearance, mathematical regression model, optimization of welding parameters

CLC Number:

KONG Liang, ZHOU Yang, WANG Min, LI Fang, HUA Xueming. Robustness of Weld Appearance on High-speed Arc-assisted Laser Welding Process on Titanium Sheet[J]. Journal of Mechanical Engineering, 2021, 57(10): 137-147.

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