Defect evolution of 409L stainless steel in high-speed TIG welding
Defect evolution of 409L stainless steel in high-speed TIG welding
复制标题
409L不锈钢高速TIG焊缺陷演变
DOI：
10.1080/10426914.2020.1711925
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发表时间：
2020-01-09
影响因子：
4.8
通讯作者：
Geng, Peihao
中科院分区：
文献类型：
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作者：
Feng, Chao;Qin, Guoliang;Geng, Peihao
摘要 高速钨极惰性气体保护焊（TIG）中的咬边和隆起焊缝缺陷导致焊缝力学性能恶化，限制了现代制造业的进步。基于熔池内的传热传质，重点分析了不同焊接速度下热输入保持基本一致的情况下，熔池和凹陷区域的几何形状以及横向通道的最大向后速度。随着焊接速度从1.0 m/min增加到3.0 m/min，侧向通道最大向后速度从0.31 m/s增加到0.57 m/s，咬边缺陷加剧。咬边缺陷最初出现在焊缝中，速度为 1.5 m/min，并且随着焊接速度的增加而变得更加严重。此外，熔池凹陷区域的长度呈现增加趋势。在2.8 m/min的速度下，首先在焊缝中观察到驼峰焊缝缺陷，凹陷区域的长度超过3.6 mm。这些发现证明了由于复杂的热力耦合效应而导致熔池中的复杂行为，也为在高速TIG焊接过程中选择合适的焊接参数有效地获得良好的焊缝提供了可能性。
ABSTRACT The undercut and humping weld defects in high-speed tungsten inert gas (TIG) welding deteriorate the mechanical properties of the weld, which limit the improvement of modern manufacturing. Based on the heat and mass transfer in the molten pool, the geometry of the molten pool and depression region and the maximum backward velocity of the lateral channel were emphatically analyzed as the heat input being retained to be basically consistent at different welding speeds. As the welding speed increases from 1.0 m/min to 3.0 m/min, the maximum backward velocity of the lateral channel increases from 0.31 m/s to 0.57 m/s, which aggravates the undercut defect. The undercut defect initially appears in the weld at 1.5 m/min and becomes more serious with increasing welding speed. Additionally, the length of the depression region of the molten pool shows an increasing trend. The humping weld defects are first observed in the weld at 2.8 m/min, and the length of the depression region exceeds 3.6 mm. These findings prove the complicated behavior in the molten pool due to the complex thermo-mechanical coupling effect, and also provide a possibility to obtain sound welds efficiently by selecting suitable welding parameters in high-speed TIG welding process.