Improving Weldability of Press Hardened Steel through Combining Stepped Current Pulse and Magnetically Assisted Resistance Spot Welding Process

IF 2.4 3区 工程技术 Q3 ENGINEERING, MANUFACTURING Journal of Manufacturing Science and Engineering-transactions of The Asme Pub Date : 2023-10-27 DOI:10.1115/1.4063904
Zhuoran Li, Dianping Zhang, Ruiming Chen, Songlin Wang, Yu-Jun Xia, Ming Lou, YongBing Li
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Abstract

Abstract Press-hardened steel (PHS) with extremely high strength has wide applications in vehicle body manufacturing as an innovative lightweight material. However, the poor weldability of PHS results in poor weld toughness and a high risk of interfacial fracture, posing challenges to the resistance spot welding (RSW) process. Introducing an external magnetic field in the welding process to perform electromagnetic stirring (EMS), magnetically assisted RSW (MA-RSW) process has been proven an effective method to improve the weld toughness of high-strength steel, but it may increase the risk of expulsion. In this study, a new process called SPMA-RSW is developed to improve the weldability of PHS by combining MA-RSW and the stepped-current pulses (SP) technique, which can enlarge the weld lobe. Nugget appearance, microstructure, microhardness, and mechanical properties were systematically investigated by comparing traditional RSW, MA-RSW, SP-RSW, and SPMA-RSW. The result showed that the SPMA-RSW process would significantly increase the nugget size, inhibit the shrinkage voids, finer the grain, and harden the nugget. This increased the lap-shear strength, energy absorption, and changed the fracture mode from brittle interfacial (IF) mode to ductile plug fracture (PF) mode at the same heat input. Then, a simple model was developed to reveal the mechanism of the effect of EMS on the fracture mode transition and was verified by experiment. This work can help improve the weld quality and thermal efficiency of the RSW process for PHS.
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阶梯电流脉冲与磁助电阻点焊相结合提高冲压淬火钢的可焊性
冲压硬化钢作为一种新型轻量化材料,具有极高的强度,在汽车车身制造中有着广泛的应用。然而,小灵通的可焊性差,导致焊缝韧性差,界面断裂风险高,给电阻点焊(RSW)工艺带来了挑战。磁辅助RSW (MA-RSW)工艺在焊接过程中引入外加磁场进行电磁搅拌(EMS),是提高高强钢焊缝韧性的一种有效方法,但可能会增加排渣的风险。为了提高小灵通的可焊性,本文将MA-RSW与步进电流脉冲(SP)技术相结合,开发了一种新的工艺——SPMA-RSW,该工艺可以扩大焊缝瓣。通过对比传统RSW、MA-RSW、SP-RSW和SPMA-RSW,系统研究了熔核的外观、显微组织、显微硬度和力学性能。结果表明:SPMA-RSW处理能显著增大熔核尺寸,抑制缩孔,细化晶粒,使熔核硬化;这增加了弯剪强度和能量吸收,并在相同的热量输入下将断裂模式从脆性界面(IF)模式转变为韧性塞断裂(PF)模式。然后,建立了一个简单的模型来揭示EMS对断裂模式转变的影响机理,并通过实验进行了验证。该工作有助于提高小灵通焊接工艺的焊接质量和热效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.80
自引率
20.00%
发文量
126
审稿时长
12 months
期刊介绍: Areas of interest including, but not limited to: Additive manufacturing; Advanced materials and processing; Assembly; Biomedical manufacturing; Bulk deformation processes (e.g., extrusion, forging, wire drawing, etc.); CAD/CAM/CAE; Computer-integrated manufacturing; Control and automation; Cyber-physical systems in manufacturing; Data science-enhanced manufacturing; Design for manufacturing; Electrical and electrochemical machining; Grinding and abrasive processes; Injection molding and other polymer fabrication processes; Inspection and quality control; Laser processes; Machine tool dynamics; Machining processes; Materials handling; Metrology; Micro- and nano-machining and processing; Modeling and simulation; Nontraditional manufacturing processes; Plant engineering and maintenance; Powder processing; Precision and ultra-precision machining; Process engineering; Process planning; Production systems optimization; Rapid prototyping and solid freeform fabrication; Robotics and flexible tooling; Sensing, monitoring, and diagnostics; Sheet and tube metal forming; Sustainable manufacturing; Tribology in manufacturing; Welding and joining
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