LY12搅拌摩擦焊接过程中搅拌针摩擦行为的研究  

Analysis of Friction Action in LY12 Friction Stir Welding

作　　者：王希靖[1] 李晶[1] 达朝炳[1] 王天宇[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料国家重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2006年第3期18-21,共4页Hot Working Technology

基　　金：甘肃省科技攻关项目(GS012-A52-069)

摘　　要：搅拌摩擦焊是一种依靠搅拌头与被焊金属之间的摩擦来实现焊接的焊接方法,二者之间的摩擦系数直接影响到最终的焊接效果。本试验对LY12铝合金摩擦系数随温度等因素的变化情况进行了研究,试验结果表明:由于温度对铝合金的表面状态的影响非常大,所以铝合金的摩擦系数在高温下的变化也很大。通过试验数据建立了LY12铝合金与高速钢的摩擦系数与温度之间的关系曲线,发现二者之间的摩擦系数随温度的增加先增大,达到金属的熔点下限后开始减小。并且对LY12铝合金搅拌摩擦焊焊接过程中的摩擦行为进行了分析。Friction stir welding （FSW） is a welding method depends on the friction between welding tool and welded material. The frictional coefficient between them affects the welding quality directly. The change of the frictional coefficient of LY12 aluminum alloy along with the change of temperature was analyzed. The results show：Since the effect of the temperature on surface state of the aluminum alloy is great, the change of the frictional coefficient of aluminum alloy at high temperature is great. The relation curve of frictional coefficient between LY 12 aluminum alloy and high-speed steel is established through the experimental data. It is found that the fiictional coefficient between them increases along with the increase of the temperature, then, decreases along with the increase of the temperature after the temperature exceeds the melting point of the aluminum alloy. The frictional action of LY 12 aluminum alloy in FSW is also analyzed in this study.

关 键 词：搅拌摩擦焊 摩擦机制 摩擦系数 

分 类 号：TG453[金属学及工艺—焊接]