Reduction of hot cracking susceptibility during laser welding of aluminum by vibrations
Reduction of hot cracking susceptibility during laser welding of aluminum by vibrations
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DOI：
10.1007/s40194-018-00680-2
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发表时间：
2018-11
影响因子：
2.1
通讯作者：
T. Radel;P. Woizeschke
中科院分区：
文献类型：
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作者：
T. Radel;P. Woizeschke
热裂纹是6xxx铝合金焊接中的主要问题之一。本研究的目的是确定在激光焊接过程中施加的振动对热裂纹敏感性的影响。在振动和不振动的情况下对EN AW-6082薄板进行了密边焊接。确定了中心线热裂纹的总长度和由此产生的焊缝晶粒结构。通过波长色散X射线光谱法定量硅和镁元素分布。通过差示扫描量热法分析了中心线附近低熔点相的存在。结果表明，在焊接速度为6 m/min的激励条件下，振动能显著减小热裂纹的总长度，而对晶粒尺寸和组织没有影响;在较低的焊接速度下，振动对晶粒尺寸和组织没有显著影响。焊缝没有显示出靠近中心线的硅和镁的富集-宏观偏析-或激发对其分布的影响。研究表明，避免焊缝中心的低熔点相成分是振动降低热裂纹敏感性的一个影响因素。
Hot cracking is one of the main issues in welding of 6xxx aluminum alloys. Aim of this study is to identify the influence of applied vibrations on the hot cracking susceptibility during laser welding. Close-edge welding of EN AW-6082 sheets with and without vibrations was carried out. The total length of the centerline hot cracks and the resulting grain structure of the welds were determined. The silicon and magnesium element distributions were quantified by wavelength dispersive X-ray spectroscopy. The presence of low melting phases close to the centerline was analyzed by differential scanning calorimetry. The results show that the total length of hot cracks was significantly reduced by the applied vibration while the grain size and structure were not affected in the case of the used excitation conditions at a welding velocity of 6 m/min, whereas no significant influence was observed at lower welding velocities. The weld seams do not show an enrichment of silicon and magnesium close to the center line—macrosegregations—or an influence of the excitation on their distributions. The study shows that the avoidance of low melting phase compositions in the seam center is an influencing factor regarding the reduction of the hot cracking susceptibility by vibrations.