A Phenomenological Model of Resistance Spot Welding on Liquid Metal Embrittlement Severity Using Dynamic Resistance Measurement

被引:17
作者
Bag, S. [1 ]
DiGiovanni, C. [2 ]
Han, X. [2 ]
Zhou, N. Y. [2 ]
机构
[1] Indian Inst Technol Guwahati, Dept Mech Engn, Gauhati 781039, Assam, India
[2] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
来源
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME | 2020年 / 142卷 / 03期
基金
加拿大自然科学与工程研究理事会;
关键词
resistance spot welding; finite element method; dynamic contact resistance; dual-phase steel; cooling rate; microstructure; liquid metal embrittlement; welding and joining; HIGH-STRENGTH STEELS; ELECTRICAL CONTACT RESISTANCE; MECHANICAL-PROPERTIES; GALVANIZED STEEL; HEAT-TRANSFER; SMALL-SCALE; FLUID-FLOW; ALUMINUM; MICROSTRUCTURES;
D O I
10.1115/1.4046162
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Liquid metal embrittlement (LME) is one of the severe problems of Zn-coated steel in resistance spot welding (RSW). Hence, proper welding schedules for Zn-coated steel are of practical interest. RSW involves a complex interaction between electrical, thermal, and mechanical phenomena. Identification and integration of all these governing physics are almost impossible by performing simple experiments. Hence, phenomenological modeling of RSW has gained a significant attention in the recent past. The complexity of the physical process introduced by the dynamic nature of contact resistance brings challenges for the model. A simplified but effective modeling approach of RSW is proposed where attention is focused on the evaluation of the thermal field using the finite element (FE) method. The interaction of the mechanical and electrical field is performed by the dynamic variation of the contact area, stress concentration, and non-uniform current density distribution in a semi-analytical model. These internal variables of the model are incorporated through the scaling of the governing parameters by the dependence of the transient and converged temperature field within a time step. The transient-dynamic contact resistance is detached from the measurement of total resistance and mapped adaptively by the implicit scheme within a time step of the numerical model. The transient development of the nugget is investigated for dual-phase steel (DP980) with an interrupted test of the dynamic resistance curve. The FE model is validated with experimentally measured results at different process conditions. The characterization of the thermal history from the model relatively identifies the LME phenomena and suggests corresponding modification of the welding schedule.
引用
收藏
页数:13
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