Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions
Microstructure, hardness profile and tensile strength in welds of AA6013 T6 extrusions
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AA6013 T6 挤压材焊缝的微观结构、硬度分布和抗拉强度
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
E. Zschech
中科院分区：
文献类型：
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作者：
L. A. Guitterez;G. Neye;E. Zschech
AA6013合金可以很容易地通过传统的弧焊工艺以及高能量密度工艺焊接。然而，在焊接过程中，必须考虑所有铝合金固有的一些物理性能。与钢相比，铝合金的高导热系数要求使用更高的焊接热输入。这是通过在铝合金GTAW过程中获得更大的焊接电流来实现的。铝合金LBW的主要问题之一是表面反射率高。特别是，铝的小孔形成的阈值强度比钢高得多。最后，铝合金，特别是可热处理的合金，对焊接裂纹很敏感。通过选择合适的焊料和母材合金，以及适当的焊料稀释，可以避免这种现象。为了提高Al-Mg-Si焊接件的力学性能，有必要对FZ和HAZ的微观组织以及残余应力分布进行研究。研究了AA6013-T6挤压件钨极气体保护焊(GTA)和激光焊接AA6013-T6的显微组织、硬度分布和拉伸强度的差异。此外，还讨论了晶界熔化和热撕裂。
Alloy AA6013 is easily welded by conventional arc welding processes as well as by high-energy-density processes. However, some physical properties, which are inherent to all aluminum alloys, have to be considered during welding. In comparison to steel, the high thermal conductivity of aluminum alloys requires the use of higher heat input for welding. This is realized by a greater welding current during GTAW of aluminum alloys. One of the main problems associated with LBW of aluminum alloys is the high surface reflectivity. In particular, the threshold intensity for the development of a keyhole is much higher for aluminum than for steel. Finally, aluminum alloys, and particularly the heat-treatable alloys, are sensitive to weld cracking. This phenomenon can be avoided by proper filler and base metal alloy selection and adequate filler metal dilution. In order to improve the mechanical integrity of Al-Mg-Si weldments, it would be desirable to study the microstructure of the FZ and of the HAZ, as well as the residual stress distribution. The present study was performed in order to show differences in microstructure, hardness profile and tensile strength of gas tungsten arc (GTA) and laser beam (LB) welded AA6013-T6 extrusions. In addition, grain boundary liquations and hotmore » tearing are discussed.« less