The small-scale resistance spot welding of refractory alloy 50Mo-50Re thin sheet
The small-scale resistance spot welding of refractory alloy 50Mo-50Re thin sheet
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DOI：
10.1007/s11837-008-0096-x
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发表时间：
2008-10
期刊：
影响因子：
2.6
通讯作者：
Jianhui Xu;T. Zhai
中科院分区：
文献类型：
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作者：
Jianhui Xu;T. Zhai
本文综述了50 Mo-50 Re难熔合金薄板（0.127mm厚）小尺寸电阻点焊的研究进展。七个重要的焊接参数保持时间，电极材料，电极形状，斜坡时间，焊接电流，电极力，焊接时间的影响进行了系统的研究，试图优化焊接质量。在SSRSW中，发现焊接熔核的直径仅为电极直径的30-40%。这是由于与大规模电阻点焊（LSRSW）中采用的高电极力相比，SSRSW中使用的电极力相对较低，其中熔核的直径几乎是电极直径的100%。在SSRSW过程中经常在熔核中发现的大孔隙可能是由于快速冷却导致的凝固期间的收缩或由于在材料的粉末冶金加工期间吸收的残余挥发性元素的团聚而导致的。
This paper is a review of the recent studies of small-scale resistance spot welding (SSRSW) of a refractory alloy 50Mo-50Re thin sheet (0.127 mm thick). The effects of seven important welding parameters—hold time, electrode material, electrode shape, ramp time, weld current, electrode force, and weld time—were studied systematically in an attempt to optimize the welding quality. The diameter of a weld nugget was found to be only 30–40% of the electrode diameter in SSRSW. This was due to the relatively low electrode force used in SSRSW compared with the high electrode force employed in large-scale resistance spot welding (LSRSW) where the diameter of the nugget was almost 100% of the electrode diameter. Large pores often found in the nugget during SSRSW could result from shrinkage during solidification due to fast cooling or fromdue to agglomeration of residual volatile elements absorbed during powder metallurgy processing of the material.