镁合金厚板激光焊接接头力学性能及微观组织研究
首发时间:2010-05-20
摘要:为了提高镁合金厚板的可焊性,采用高功率CO2激光对10mm厚镁合金激光焊接接头微观组织和拉伸性能进行了研究。研究发现:焊缝熔合区由等轴枝晶组成,随着焊接热输入的减少,其晶粒细化,β-Mg17Al12相含量增加。焊缝表面严重的凹坑缺陷和焊缝内部气孔导致激光焊接接头拉伸强度降低,最高仅为母材强度的74%。初步开展的激光补焊研究表明:通过补焊消除表面凹坑缺陷层后,接头拉伸强度得到明显提高,达到母材强度的91%。此外,补焊层内的细小晶粒同样有助于整个接头强度的提高。
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Tensile strength and microstructure of laser welded thick magnesium alloy
Abstract:For improving the weldability of thick magnesium alloys, the microstructure and tensile properties of laser welds of 10mm AZ31 magnesium alloy are studied by high power CO2 laser. The weld metal consists of dendrites and the decreasing of heat input can refine the grain size and increase theβ-Mg17Al12 phase content in weld metal. The maximum tensile strength of laser weld is only 74% of base metal, which is reduced dramatically by the serious surface concave defect and the weld porosity. The primary study of laser repair welding for the laser weld of thick magnesium ally shows that the concave defect can be well avoided. Moreover, the fine grains in laser repaired layer are also in favor of the increase of joint tensile strength. As a consequence, the joint tensile strength of laser repaired weld can reach 91% of base metal.
Keywords: Magnesium alloys Laser welding Tensile strength Microstructure Repair welding
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No.4372287534814127****
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