6082-T6铝合金填料搅拌摩擦焊工艺

PInvestigation of friction stir welded 6082-T6 Al alloy with fillers

针对轨道列车车体铝合金搅拌摩擦焊过程中产生的装配间隙问题,采用在间隙处填充焊丝与焊片的方式对6082-T6铝合金进行搅拌摩擦焊接。结果表明,两种填充方式的FSW接头在拉伸过程中均断裂于热影响区,填充的焊丝与焊片并不会导致焊核区在拉伸过程中开裂,进而影响接头力学性能。提高焊接速度有助于增强填充焊片接头的拉伸强度,最优焊接参数为转速1200 r/min,焊接速度600 mm/min,其抗拉强度达到245 MPa;而对于填充焊丝的接头,其抗拉强度略有降低,为235 MPa。本研究为铝合金长直搅拌摩擦焊缝间隙问题提供了一种有效的解决方案。

In order to solve the assembly gap problem in the process of friction stir welding for aluminum alloy of rail car body,this paper adopts the method of filling welding wire and welding pad in the gap to carry out friction stir welding of 6082-T6 aluminum alloy.It was found that the fracture posi-tion located at heat affect zone for the tensile specimens of both FSW joints.The filling of welding wire and welding sheet did not cause crack formation in weld nugget and further affect the mechanical properties.Moreover,increasing the welding speed was helpful to improve the tensile strength of FSW joints with adding welding wire and welding sheet.A high ultimate tensile strength(UTS)of 245 MPa was obtained in the FSW joint with adding welding sheet under an optimal parameter of 1200 r/min and 600 mm/min;while the UTS reduced to 235 MPa for FSW joint with adding welding wire.This study provides an efficient method to solve the assembly gaps in the FSW of long Al alloy welds.