A356铝合金搅拌摩擦焊接热力耦合分析  

Thermal Mechanical Coupling Analysis of Friction Stirring Welding Aluminum Alloy A356 Based on Finite Element Method

作　　者：朱金芳[1] 

机构地区：[1]浙江工业职业技术学院

出　　处：《特种铸造及有色合金》2015年第8期813-817,共5页Special Casting & Nonferrous Alloys

基　　金：浙江省科技计划资助项目(2012C31018)

摘　　要：借助多场耦合求解技术,利用Comsol Multiphysics软件建立了A356.0-T61铝合金搅拌摩擦焊接热力耦合的有限元模型。并利用JMatPro定义了随温度变化的A356铝合金的热物理属性,着重分析轴向下压力、旋转速度、焊接速度等工艺因素对搅拌摩擦焊A356铝合金温度场和应力分布演变规律的影响。结果表明,焊接速度对FSW等温线椭圆形分布形状的椭圆率影响很大;在SAZ的外边缘处焊接等效应力最大,在SAZ的外缘附近区域出现呈离散状态分布的低应力小区域。A356铝合金FSW温度场分布的工艺参数影响的显著性顺序为:焊接速度>搅拌头旋转速度>轴向下压力;焊接应力分布的工艺参数影响的显著性顺序为:轴向下压力>焊接速度>搅拌头旋转速度。Based on the technical characteristics of friction stirring welding, with the help of multi-field coupling reasonable solution techniques, Comsol Multiphysics software was used to establish thermal mechanical coupling finite element model of friction stirring welding A356.0-T61 aluminum alloy. JMat- Pro was applied for defining thermo-physical properties of A356 aluminum alloy material with temperature changes, and effects of axial down-pressure, rotation speed, welding speed and other factors on the temperature field and stress distribution evolution of friction stirring welding A356 aluminum alloy were analyzed mainly. The results show that the welding speed has domonant in influence on ellipticity of elliptic distribution of FSW isotherm shape. The largest welding equivalent stress is located at outside edge of SAZ, near which the small areas of low stress distribution shows discrete state. The effect significance order of process parameters on friction stirring welded A356 aluminum alloy temperature field distribution is presented as follows： welding speed 〉 head rotation speed 〉 axial downward pressure, and the effect significance order of process parameters on friction stirring welded A356 aluminum alloy stress distribution is presented as follows： axial downward pressure 〉 welding speed 〉 rotation speed.

关 键 词：A356铝合金 焊接工艺 有限元分析 搅拌摩擦焊接 

分 类 号：TG453.9[金属学及工艺—焊接] TG146.21[一般工业技术—材料科学与工程]