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首页> 外文期刊>Journal of Materials Science >Marangoni convection and weld shape variations in He-CO2 shielded gas tungsten arc welding on SUS304 stainless steel
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Marangoni convection and weld shape variations in He-CO2 shielded gas tungsten arc welding on SUS304 stainless steel

机译：在SUS304不锈钢上进行He-CO2气体保护钨极电弧焊的Marangoni对流和焊缝形状变化

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摘要

Bead-on-plate GTA welding (gas tungsten arc welding) on a SUS304 substrate is carried out to investigate the effect of carbon dioxide gas in the helium base shielding on the oxygen content in the weld pool and the weld shape variations. Experimental results show that small addition of carbon dioxide to the shielding gas can precisely adjust the weld metal oxygen content and change the weld shape from wide shallow type to narrow deep one when the weld pool oxygen content is over the critical value, which is from 68 to 82 ppm, due to the Marangoni convection reversal from the outward to inward mode on the pool surface. The weld depth/width ratio increases two times suddenly when the carbon dioxide content in the torch gas is over 0.4 or 0.2% for 1 mm or 3 mm arc length, respectively. The GTA weld shape depends to a large extent on the pattern and magnitude of the Marangoni convection on the pool surface, which is influenced by the active element oxygen content in the SUS304 pool, temperature coefficient of the surface tension (d sigma/dT), and the temperature gradient on the pool surface (dT/dr, r is the radius of the weld pool surface). Changing the welding parameters will alter the temperature distribution and gradient on the pool surface, and thus, affect the magnitude of the Marangoni convection and the final weld shape.
机译：进行了SUS304基板上的珠焊GTA焊接（气体钨极电弧焊），以研究氦气基保护层中的二氧化碳气体对焊池中氧含量和焊缝形状变化的影响。实验结果表明，当焊接熔池中的氧气含量超过临界值（从68）时，向保护气体中少量添加二氧化碳可以精确地调节焊接金属的氧气含量，并将焊缝形状从宽浅型转变为窄深型。到82 ppm，这是由于Marangoni对流在池表面从外向内反转所致。当焊枪气体中的二氧化碳含量分别对于1 mm或3 mm电弧长度超过0.4％或0.2％时，焊接深度/宽度比突然增加两倍。 GTA焊缝的形状在很大程度上取决于池表面的Marangoni对流的模式和大小，这受SUS304池中活性元素氧含量，表面张力温度系数（d sigma / dT）的影响，熔池表面的温度梯度（dT / dr，r为熔池表面的半径）。改变焊接参数将改变熔池表面的温度分布和梯度，从而影响Marangoni对流的大小和最终的焊接形状。

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