Comparison Between Keyhole Weld Model and Laser Welding Experiments

Wood, B C ; Palmer, T A ; Elmer, J W

Lawrence Livermore National Laboratory

关键词: Laser Welding;    36 Materials Science;    Vanadium;    Geometry;    Absorptivity;   

DOI  :  10.2172/15006362
RP-ID  :  UCRL-ID-150357
RP-ID  :  W-7405-ENG-48
RP-ID  :  15006362

美国|英语

来源: UNT Digital Library

【 摘 要 】

A series of laser welds were performed using a high-power diode-pumped continuous-wave Nd:YAG laser welder. In a previous study, the experimental results of those welds were examined, and the effects that changes in incident power and various welding parameters had on weld geometry were investigated. In this report, the fusion zones of the laser welds are compared with those predicted from a laser keyhole weld simulation model for stainless steels (304L and 21-6-9), vanadium, and tantalum. The calculated keyhole depths for the vanadium and 304L stainless steel samples fit the experimental data to within acceptable error, demonstrating the predictive power of numerical simulation for welds in these two materials. Calculations for the tantalum and 21-6-9 stainless steel were a poorer match to the experimental values. Accuracy in materials properties proved extremely important in predicting weld behavior, as minor changes in certain properties had a significant effect on calculated keyhole depth. For each of the materials tested, the correlation between simulated and experimental keyhole depths deviated as the laser power was increased. Using the model as a simulation tool, we conclude that the optical absorptivity of the material is the most influential factor in determining the keyhole depth. Future work will be performed to further investigate these effects and to develop a better match between the model and the experimental results for 21-6-9 stainless steel and tantalum.