中文摘要：

为了预测并控制激光拼焊板的力学性能,通过对0.8~1.5 mm的St12板及其镀锌板拼焊板接头组织的定量分析,结合其组织性能变化规律,得出影响力学性能的首要因素为马氏体含量,继而可得工艺优化控制方法。在此基础上建立了以焊接工艺及板厚为输入变量的偏最小二乘回归拼焊板力学性能预测模型。实例验证发现,所建预测模型对拼焊板抗拉强度及延伸率的预测精度均达91%以上,充分表明该模型与试验结果吻合良好,验证了该预测模型的合理性及适用性。

英文摘要：

For the prediction and control of mechanical property of laser tailor-welded blanks,combining it′s microstructure-property rule microstructual qualitative analysis of joint microstructure of 0.8~1.5 mm St12 steel and galvanized steel sheet is constructed.The predominant influencing factor is martensite content and the optimal control process is obtained.On the basis of the research,prediction models of mechanical properties of tailor-welded blanks trained with welding processes and sheet thickness as input variables are put forward based on partial least-squares regression.According to the testing results,the forecasting accuracy of tensile strength and elongation is above 91%.Therefore,the proposed models are reasonable and applicable to examine deep-drawing steel for demonstrative purposes.