LY12搅拌摩擦焊接技术

Friction Stir Welding Technology of YL12 Alloys

搅拌摩擦焊接是一种新兴的焊接工艺 ,本文作者在立式铣床上配置辅助夹具 ,对LY12铝合金做了大量的搅拌摩擦焊接 (FrictionStirWelding)工艺试验 ,在焊接过程中捕捉到一些与接头形成相关的理化信息 ,进而探讨了FSW接头的的形成机理 ,初步优化了LY12铝合金FSW工艺参数 ,分析研究了搅拌头形状、旋转速度、焊接速度对FSW接头质量的影响。试验结果表明 ,焊接厚度为 4mm的LY12铝合金 ,夹持器与特形指棒直径之比 3 :1为好 ,特形指棒直径与焊件厚度之比 1:1为好。焊接速度选择 3 7.5mm/min ,搅拌头旋转速度选择 2 0 0 0r/min时 ,接头质量良好。本文试验结果为进一步研究开发搅拌摩擦焊接技术奠定了一定的理论与试验基础。

Friction Stir Welding is a new and developing welding technology.With the vertical milling machine equiped with auxiliary fixture,a lot of technological experiments on Friction Stir Welding of LY12 alloy had been done,and some theoretic information about the joint figuration was found.Preceding to the next step,the mechanism of Friction Stir Welding and the influence of the stirrer′s shape,rotation speed,and welding speed on joint quality were studied.The experiment result shows that when the thickness of LY12 alloy is 4mm,the diameter rate of rotation tool shoulder and the welding pin with special profile is 3:1,the rate of the diameter of the pin and the thickness of welded material is 1:1,the welding speed is 37.5mm/min and the rotation speed is 2000r/min,a joint of high quality is formed.The result has laid a theoretical and experimental foundation for further research for Friction Stir Welding.