主办：陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊：1976年
汽车实用技术

汽车实用技术 ›› 2026, Vol. 51 ›› Issue (16): 85-90.DOI: 10.16638/j.cnki.1671-7988.2026.016.016

• 工艺·材料 • 上一篇    

Usibor 1300 热成形钢电容储能凸焊工艺 参数优化

吕海波，于晓丰，刘春鹏，姜峰   

  1. 吉林化工大学 机电工程学院
  • 发布日期:2026-08-28
  • 通讯作者: 吕海波
  • 作者简介:吕海波（1981－），男，硕士，高级工程师，研究方向为焊接工艺设计与合金制备
  • 基金资助:
    吉林省教育厅科学技术研究项目（JJKH20240319CY）

Optimization of process parameters for capacitor discharge welding of Usibor 1300 hot-formed steel

LÜ Haibo, YU Xiaofeng, LIU Chunpeng, JIANG Feng   

  1. School of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology
  • Published:2026-08-28
  • Contact: Lü Haibo

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摘要： 采用电容储能凸焊工艺，完成 SWRCH15A 铝镇静钢凸焊螺母与 Usibor 1300 高强热成 形钢的连接。文章通过正交试验，系统探究不同工艺参数对凸焊接头熔核尺寸、扭矩强度等 关键性能的影响，结合极差分析与综合加权评分法确定最优焊接工艺参数。试验结果表明， 在本次试验范围内，电极压力为 0.3 MPa、焊接时间为 55 cycles、焊接电压为 320 V、冷却时 间为 25 cycles 时，凸焊接头综合性能最佳。最优工艺参数下，接头螺母侧热影响区包含粗晶 区与细晶区，显微组织以铁素体为主；热成形钢侧热影响区可分为完全淬火区、不完全淬火 区和回火区，其中完全淬火区组织以马氏体为主，不完全淬火区为马氏体、铁素体与贝氏体 混合组织，回火区主要为回火马氏体。接头断口三维形貌分析结果表明，该凸焊接头呈现韧 脆混合断裂特征。

关键词: 热成形钢；凸焊；正交试验；热影响区；断裂模式

Abstract: The capacitor discharge projection welding process is adopted to realize the connection of SWRCH15A aluminum-killed steel projection welding nuts and Usibor 1300 high-strength hotformed steel. This paper conducts orthogonal tests to systematically investigate the effects of different process parameters on key properties of projection welding joints including nugget size and torque strength, and determines the optimal welding process parameters through range analysis and the comprehensive weighted scoring method. The test results show that within the test range, the projection welding joint exhibits the best comprehensive performance under the process parameters of electrode pressure of 0.3 MPa, welding time of 55 cycles, welding voltage of 320 V and cooling time of 25 cycles. Under the optimal process parameters, the heat-affected zone on the nut side consists of a coarse-grained zone and a fine-grained zone, with ferrite as the dominant microstructure. The heat-affected zone on the hot-formed steel side is divided into the full quenching zone, the incomplete quenching zone and the tempering zone. The microstructure of the full quenching zone is mainly martensite, the incomplete quenching zone presents a mixed microstructure of martensite, ferrite and bainite, and the tempering zone is dominated by tempered martensite. The threedimensional morphology analysis of the fracture surface of the projection welding joint indicates that the joint presents a mixed ductile-brittle fracture mode.

Key words: hot-formed steel; projection welding; orthogonal tests; heat-affected zone; fracture mode