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基于小孔前壁演化动力学的分析,考虑激光束强度空间分布及等离子体吸收强度等因素,建立了激光深熔焊熔透深度的预测模型.利用该模型对奥氏体不锈钢Yb光纤激光焊在不同焊接速度下的熔透深度值进行了预测,并与试验结果进行了比较.利用该模型还研究了熔透深度与离焦量的关系.结果表明:利用该模型预测得到的熔透深度值与试验结果吻合较好;熔透深度随负离焦量的增大而增大,随正离焦量的增大而减小.
Based on the analysis of the evolution dynamics of the front wall of the pinhole, a prediction model of penetration depth of laser deep penetration welding was established considering the spatial distribution of laser beam intensity and the absorption intensity of plasma, etc. The Yb fiber laser welding of austenitic stainless steel The penetration depth values at different welding speeds were predicted and compared with the experimental results.The relationship between penetration depth and defocus amount was also studied.The results show that the depth of penetration The values agree well with the experimental results. The depth of penetration increases with the increase of negative defocus and decreases with the increase of positive defocus.