钢铝搅拌摩擦焊搭接接头的机械结合与冶金结合方式

发布时间：2018-09-04 08:02

【摘要】：为了在汽车制造业中实现节能环保的目的,铝合金在车身材料中的应用是实现汽车结构轻量化的重要途径。然而,钢/铝异种材料的连接问题尚未得到解决。考虑采用搅拌摩擦焊方法连接钢/铝异种材料,通过控制搅拌针的压入量,获得两种不同结合方式的接头:一种是搅拌针进入钢材中,形成机械+冶金结合的接头;另一种是搅拌针不进入钢材中,仅通过热传递的方式将摩擦热量传输到钢/铝冶金界面上形成冶金结合的接头。对形成的异种材料接头进行剪切测试和连接界面观察。研究结果表明,钢板上的镀锌层对钢/铝接头的形成具有重要影响。在机械+冶金结合的接头中,钢/铝之间的冶金界面层较厚,主要由Al、Zn元素组成;而在冶金结合接头中,界面层的厚度仅为2~3μm,且主要由Fe、Al元素组成,并对影响接头强度的影响因素进行探讨。
[Abstract]:In order to realize the purpose of energy saving and environmental protection in automobile manufacturing, the application of aluminum alloy in body material is an important way to realize the lightweight of automobile structure. However, the connection problem of steel / aluminum dissimilar materials has not been solved. The friction stir welding method is considered to connect steel / aluminum dissimilar materials. Two kinds of joints with different bonding modes are obtained by controlling the injection amount of the stirring needle. One is that the stirring needle enters into the steel to form a mechanical metallurgical joint; The other is that the friction heat is transferred to the steel / aluminum interface to form a metallurgical joint only by heat transfer. Shear test and interface observation were carried out on the formed dissimilar material joints. The results show that the galvanized layer on the steel plate has an important effect on the formation of the steel / aluminum joint. The metallurgical interface layer between steel and aluminum is thicker, which is mainly composed of Al,Zn element, while in metallurgical joint, the thickness of interface layer is only 2 渭 m, and is mainly composed of Fe,Al element. The influence factors of joint strength are discussed.
【作者单位】：北京工业大学材料科学与工程学院;
【基金】：国家自然科学基金(51005004,51275006) 北京市自然科学基金(3132006) 北京市教委项目科研(面上)(KM2012100050010)资助项目
【分类号】：TG453.9

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