新型高强塑积富B-Al合金的电阻点焊熔核飞溅研究

He Youyou, Liu Weijie, ,

摘要:

本文通过自行设计配比一种新型高强塑积富B-Al合金材料。考虑到该种合金材料主要用于乘用车结构件，因此着重研究电阻点焊焊接性。同时借鉴国际焊接性评判标准ISO 14327-2004，设计了复杂焊接条件下的混合水平均匀设计实验。找出了影响该材料点焊熔核飞溅的主要工况因素，并通过建立点焊熔核飞溅边界曲线，从而有效地预测该材料点焊飞溅概率，更进一步的了解点焊熔核质量及点焊飞溅现象与焊接工艺、焊接环境等因素的相互关系，通过建立该材料点焊熔核力矩平衡方程与熔核膨胀应力数值仿真，深入分析点焊飞溅机理，在一定程度上促进了该新型高强塑积合金的实际应用。

Abstract:

A new B-Al-rich steel with high-strength and plasticity was developed and its RSW performance was studied when used as the structure materials of automobiles. The hybrid orthogonal experiments of complex welding conditions were implemented under the ISO14327-2004 standard and the main factors that can influence the spattering of nuggets were found. The boundary curves of nugget-spatter lobe diagram that could effectively predicate the expulsion rate of the developed steel were also drawn. The relationships among the nugget size, spatter, welding process and environments were further understood. A moment balance function of nugget was developed and the function-based numerical simulation for the coefficient of swelling stress was conducted. Therefore, the further understood spatter mechanism promoted the engineering application of the developed hot-stamped steels.