B170P1差厚高强度钢激光拼焊板拉伸试验研究

Experimental research on tensile test of B170P1 multi-gauge high strength steel laser tailor-welded blanks

采用不同激光焊接工艺参数对不同厚度的B170P1高强度钢进行焊接,并对焊后试样进行拉伸试验,研究不同激光焊接工艺对拼焊板力学性能的影响。结果表明:在焊接质量合格的情况下,焊接功率越高,焊接件的塑性和韧性越差;适当增加焊接速度,可以提高焊接件的塑性和韧性;随着热输入量的增加,真实应力-应变曲线也随之升高,表明焊缝的塑化能力随着热输入量的增加而减小,采用较小的热输入量可以提高拼焊板的塑性成形性能。

Two types of B170P1 high-strength steel with different thicknesses were welded with different laser welding process parameters. The tailor-welded blanks were examined in tensile test. The mechanical property was investigated for the different laser welding parameters. The results show that the welding specimens with higher power have lower plasticity and ductility if the welding quality is eligible. Increasing the welding speed appropriately can enhance the plastic nature and ductility of welding specimens. The true stress-strain curve will he higher with the increasing heat input. It indicates that the plasticizing capacity will decrease with the increase of heat input. Small heat input can increase the plastic forming properties of tailor-welded blanks.