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首页> 外文期刊>Journal of Materials Engineering and Performance >Metallurgical Effects of Shunting Current on Resistance Spot-Welded Joints of AA2219 Sheets
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Metallurgical Effects of Shunting Current on Resistance Spot-Welded Joints of AA2219 Sheets

机译：分流电流对AA2219薄板电阻点焊接头的冶金影响

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摘要

Shunting effect is the loss of electrical current via the secondary circuit provided due to the existence of previous nugget in a series of welding spots. This phenomenon influences on metallurgical aspects of resistance spot-welded (RSW) joints in terms of quality and performance. In this paper RSW joints of AA2219 sheets with 1 mm thickness are investigated metallurgically for shunted and single spots. An electro-thermal finite element analysis is performed on the RSW process of shunted spot and temperature distribution and variation are obtained. These predictions are then compared with experimental micrographs. Three values of 5 mm, 20 mm, and infinite (i.e., single spot) are assumed for welding distance. Numerical and experimental results are matching each other in terms of nugget and HAZ geometry as increasing distance raised nugget size and symmetry of HAZ. In addition, important effect of shunting current on nugget thickness, microstructure, and Copper segregation on HAZ grain boundaries were discovered. A quantitative analysis is also performed about the influence of welding distance on important properties including ratio of nugget thickness and diameter (r (t)), ratio of HAZ area on shunted and free side of nugget (r (HA)), and ratio of equivalent segregated and total amount of Copper, measured in sample (r (Cu)) on HAZ. Increasing distance from 5 mm to infinite, indicated a gain of 111.04, -45.55, and -75.15% in r (t), r (HA), and r (Cu), respectively, while obtained ratios for 20 mm welding distance was suitable compared to single spot.
机译：分流效应是由于在一系列焊接点中存在先前的熔核而导致的通过次级电路的电流损耗。就质量和性能而言，此现象影响电阻点焊（RSW）接头的冶金学方面。在本文中，对冶金用的AA2219薄板的RSW接头进行了冶金研究，以发现分流点和单点。对分流点的RSW过程进行了电热有限元分析，得到了温度分布和变化。然后将这些预测与实验显微照片进行比较。假定焊接距离为5mm，20mm和无穷大（即单点）三个值。随着熔核距离的增加和热影响区的对称性的增加，数值结果和实验结果在熔核和热影响区的几何形状方面相互匹配。此外，发现了分流电流对热影响区晶界的熔核厚度，微观结构和铜偏析的重要影响。还对焊接距离对重要性能的影响进行了定量分析，这些重要性能包括：熔核厚度和直径之比（r（t）），熔核分流和自由侧的HAZ面积比（r（HA））以及熔接比HAZ样品（r（Cu））中测得的铜的当量分离和总量。距离从5 mm增加到无限，表明r（t），r（HA）和r（Cu）的增益分别为111.04，-45.55和-75.15％，而获得的20 mm焊接距离的比率是合适的相比单点。

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