Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Experimental and numerical evaluation of the off-time interval effect on the joint quality of AA2219 sheets in successive resistance spot welding

Document Type : Original Article

Authors
Mehdi Jafari Vardanjani
Yaghoub Dadgar Asl
Assistant Professor, Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran
10.22034/ijme.2024.482084.2015
Abstract
The final quality of resistance spot welding joints mainly depends on the electric current, electrode force, welding time and sheet thickness. These parameters will be added in the case of successive spot welds, depending on the weld type. Other parameters including welding distance, number of previous weld spots and time interval between the two spots appear due to electrical, thermal and mechanical interactive effects of adjacent weld nuggets. In this article, the effect of welding time interval has been evaluated on the resistance spot welded joints on AA-2219 sheets. In this regard, the metallurgical and mechanical behavior of the final spot has been analyzed experimentally and numerically. The results of finite element analysis have been considered to investigate the electrical and thermal aspects of this phenomenon to obtain the history and distribution of the final spot temperature, for experimental verification. The welding time interval has been chosen as the main variable for two consecutive spots with a welding distance of 5 mm with values of 0.5, 1 and 1.5 seconds. Therefore, the microstructure and tensile-shear strength of the final weld spot have been evaluated. The results showed that a longer distance leads to changes in preheat temperature, slightly faster cooling rate, lower shear-tensile strength (0.6%), asymmetric distribution of the heat affected zone (15%) due to the intensification of the shunting current, smaller diameter and height of the weld nugget (2% and 3% respectively); while shorter time interval has resulted in reduced shunting current, slight preheat, higher tensile strength, more symmetrical distribution of heat affected zone and larger weld nugget.
Keywords
Weld Spacing
Heat Distribution
Inter-Welding Time Interval
Numerical Analysis
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