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首页> 外文会议>International conference on power beam processing technologies >Study on Characteristics and Generation Mechanism of YAG Pulsed Laser Welding Cracks of AZ31B Magnesium Alloy
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Study on Characteristics and Generation Mechanism of YAG Pulsed Laser Welding Cracks of AZ31B Magnesium Alloy

机译：AZ31B镁合金YAG脉冲激光焊接裂缝的特性和发电机理研究

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摘要

Due to poor welding metallurgy of magnesium alloy, laser welding crack is still one of the main defects. The welding cracks seriously affected the weld quality and reduce the mechanical properties of welded joints which have become a bottleneck of the magnesium alloy products widely used in the structure materials. In this paper, AZ31B magnesium alloy plates in sheet of 2mm in thickness were chosen. The forming reason and extending characteristics of the welding cracks were investigated during the Nd:YAG pulsed laser welding. The results show that welding cracks are mainly solidification cracking which were always present in the weld centers. Few welding hot cracks appear multiple furcation phenomenons, and main crack and branch crack were intercrystalline crack. The partial branch crack was mixed intercrystalline and transgranular extending. In addition, few cracks in the weld were caused due to irregular shape porosity and inclusion. The delayed crack werent observed in the weld after deposited 48 hours. In the preprocess on the basis, the characteristics and generation mechanism of YAG pulsed laser welding cracks of magnesium alloy were analyzed further. It would thus be reasonable to assume that this would be a kind of hot cracking because of the stress generation during the heat cycles.
机译：由于镁合金的焊接冶金差，激光焊接裂缝仍然是主要缺陷之一。焊接裂缝严重影响了焊接质量，降低了焊接接头的机械性能，该焊接接头已成为结构材料广泛应用的镁合金产品的瓶颈。本文选择了厚度2mm片材中的AZ31B镁合金板。在Nd：YAG脉冲激光焊接期间研究了焊接裂缝的形成原因和延伸特性。结果表明，焊接裂缝主要是焊接中心始终存在的凝固裂缝。少量焊接热裂缝出现多种突发现象，主要裂纹和分支裂纹是间晶状体的裂缝。部分分支裂纹混合肾细胞和转骨延伸。此外，由于形状孔隙率和夹杂物，焊缝中的几个裂缝是引起的。在沉积48小时后在焊缝中观察到的延迟裂缝。在基于预处理中，进一步分析了镁合金的YAG脉冲激光焊接裂缝的特性和产生机制。因此，假设这将是由于在热循环期间的应力产生而是一种热裂纹。

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