热输入对7A52铝合金光纤激光焊接头组织及性能的影响

发布时间：2018-03-05 20:54

本文选题：光纤激光焊　切入点：显微组织　出处：《焊接》2017年01期 　论文类型：期刊论文

【摘要】：采用IPG公司生产的YLS-6000光纤激光器,对6mm厚热轧态7A52铝合金进行焊接,研究不同焊接参数对接头组织及性能的影响。结果表明,焊缝中心为均匀分布的"雪花"状等轴晶,组织为α-Al+T(Mg_3Zn_3Al_2),与母材相同,晶粒大小随热输入的增加而长大;随热输入增加,Mg,Zn元素的烧损逐渐加重;相同热输入下,高功率、高焊速能够降低Mg,Zn元素的烧损;母材硬度最高约为110HV左右,焊缝中心硬度最低,硬度从焊缝中心向两侧母材呈"U"型分布;适当增大焊接热输入,接头的冲击吸收能量和抗拉强度均有所提高;在相同热输入情况下,高功率、高焊速的接头冲击性能降低,抗拉强度有所提高,最大抗拉强度为341MPa,约为母材的69.8%,7A52铝合金光纤激光焊接头拉伸断口形貌呈韧-脆混合断裂。
[Abstract]:The 6mm thick hot rolled 7A52 aluminum alloy was welded by YLS-6000 fiber laser produced by IPG. The effect of different welding parameters on the microstructure and properties of the joint was studied. The results show that the center of the weld is a uniform "snowflake" equiaxed crystal. The microstructure is 伪 -Al Tnmg _ 3Zn _ 3Al _ 2C _ (2), which is the same as the base metal, the grain size grows with the increase of heat input, the burning loss of mg ~ (2 +) Zn increases gradually with the increase of heat input, and the burning loss of mg ~ (2 +) Zn can be reduced by high power and high welding speed under the same heat input. The hardness of the base metal is about 110 HV, the hardness of the weld is the lowest, the hardness of the base metal is U "from the center of the weld to the two sides of the weld, the energy of impact absorption and the tensile strength of the joint are increased by increasing the welding heat input properly." Under the same heat input condition, the impact property of the joints with high power and high welding speed is decreased, and the tensile strength is improved. The maximum tensile strength is 341MPa, and the tensile fracture of 69.8% and 7A52 aluminum alloy fiber laser welding joints is ductile-brittle mixed fracture.
【作者单位】：内蒙古工业大学材料与工程学院;
【基金】：内蒙古青年科技英才领军人物基金项目(103-841025)
【分类号】：TG457.14

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