新型铝钢搅拌摩擦焊对接工艺分析

发布时间：2018-03-27 23:41

本文选题：搅拌摩擦焊　切入点：Q钢　出处：《轻合金加工技术》2017年04期

【摘要】：以3 mm厚的碳素结构钢Q235与3 mm厚的2A12铝合金为基材,通过机械加工的方式沿厚度方向将钢端面加工成倾斜的锯齿形状,运用搅拌摩擦偏心焊完成钢和铝异种金属的连接,以异种金属的对接焊接接头为研究对象。从焊缝宏观组织可以看到,在搅拌针的搅拌与轴向顶锻力的共同作用下,锯齿顶部的钢发生软化并随搅拌针的搅拌迁移到铝基体中。运用XRD分析表明,结合界面处除了铁和铝之外,还形成了Fe Al、Fe Al2等金属间化合物,靠近铝侧的焊缝显微硬度比铝母材的硬度要高,原因是形成的金属间化合物使得其硬度增高,通过扫描电镜与元素能谱分析,锯齿的底部铝钢结合界面形成了一层比较薄的过渡层,铝钢接头以冶金和机械结合的方式为主。
[Abstract]:Taking the carbon structure steel Q235 with the thickness of 3 mm and the 2A12 aluminum alloy with the thickness of 3 mm as the base material, the end face of the steel was machined along the thickness direction to form an inclined sawtooth shape by mechanical processing. Friction stir eccentric welding was used to complete the connection between the steel and the aluminum dissimilar metal. Taking butt welded joints of dissimilar metals as the research object, it can be seen from the macroscopic structure of welding seam that under the joint action of stirring needle and axial forging force, The steel at the top of the sawtooth softens and migrates to the aluminum matrix with the stirring needle. The XRD analysis shows that in addition to iron and aluminum, the intermetallic compounds such as Fe Alnife Al2 are formed at the interface. The microhardness of the weld near the aluminum side is higher than that of the aluminum base metal, because the hardness of the weld metal is increased due to the formation of the intermetallic compound. A thin transition layer was formed at the interface between aluminum and steel at the bottom of the sawtooth.
【作者单位】：兰州理工大学甘肃省有色金属新材料国家重点实验室;
【基金】：国家自然科学基金资助项(51265030) 甘肃省自然科学基金(2014GS03264)
【分类号】：TG453.9

【相似文献】