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首页> 外文期刊>Metallography, Microstructure, and Analysis >Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy
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Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

机译：水下搅拌摩擦焊接铝合金的焊接缺陷特征及形成机理

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摘要

Underwater friction stir welding (FSW) has been demonstrated to be a promising method for strength improvement of heat-treatable aluminum alloy joints. However, when improper welding parameters are utilized, welding defects, such as voids can be produced in the joints, leading to dramatically deteriorated mechanical properties. Thus to obtain high-quality underwater joints, it is necessary to understand the variables that promote the formation of these defects. In this study, the characteristics of welding defects in underwater joints were examined, and the formation mechanisms of the defects were investigated by analyzing the material flow patterns during underwater FSW. The results indicated that welding defects can occur at both low- and high-rotation speeds (HRS). The defects formed at HRS can be divided into two types according to the welding speed. When a HRS and a low welding speed are chosen, the material beneath the tool shoulder tends to be extruded into the pin stirred zone (PSZ) after flowing back to the advancing side. This results in a turbulent flow condition, creating void defects in the PSZ. When a high welding speed is coupled with the HRS, a large amount of material from the thermo-mechanically affected zone is dragged into the pin hole, which causes the material of the shoulder stirred zone to fill the pin hole in a downward flow direction. This leads to turbulent flow in PSZ, and creates voids or even groove defects in the as-welded joints.
机译：水下摩擦搅拌焊接（FSW）已被证明是一种可改进铝合金热处理接头强度的有前途的方法。但是，当使用不合适的焊接参数时，在接头中会产生焊接缺陷，例如空洞，从而导致机械性能急剧下降。因此，要获得高质量的水下接头，必须了解促进这些缺陷形成的变量。在这项研究中，研究了水下接头的焊接缺陷的特征，并通过分析水下FSW期间的材料流态来研究了缺陷的形成机理。结果表明，低转速和高转速（HRS）都可能发生焊接缺陷。根据焊接速度，HRS上形成的缺陷可以分为两种。当选择HRS和低焊接速度时，在返回到前进侧后，刀肩下方的材料倾向于挤出到销钉搅拌区（PSZ）中。这导致湍流状态，在PSZ中产生空隙缺陷。当高焊接速度与HRS结合时，来自热机械影响区的大量材料被拖入针孔，这导致肩部搅拌区的材料在向下的流动方向上填充针孔。这会导致PSZ中产生湍流，并在焊接后的接头中产生空隙甚至凹槽缺陷。

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