A Modified Analytical Heat Source Model for Numerical Simulation of Temperature Field in Friction Stir Welding

Abstract

In the conventional analytical model used for heat generation in friction stir welding (FSW), the heat generated at the pin/ workpiece interface is assumed to distribute uniformly in the pin volume, and the heat flux is applied as volume heat. Besides, the tilt angle of the tool is assumed to be zero for simplicity. ese assumptions bring about simulating deviation to some extent. To better understand the physical nature of heat generation, a modified analytical model, in which the nonuniform volumetric heat flux and the tilt angle of the tool were considered, was developed. Two analytical models are then implemented in the FEM software to analyze the temperature fields in the plunge and traverse stage during FSW of AA6005A-T6 aluminum hollow extrusions. e temperature distributions including the maximum temperature and heating rate between the two models are different. e thermal cycles in different zones further revealed that the peak temperature and temperature gradient are very different in the high-temperature region. Comparison shows that the modified analytical model is accurate enough for predicting the thermal cycles and peak temperatures, and the corresponding simulating precision is higher than that of the conventional analytical model.

Study on surface thermal deformation of laser cladding screw based on path planning

“…At present, most numerical simulation of laser cladding adopts Gaussian heat source model, and planar Gaussian heat source model is a typical planar heat source distribution function [10]. This model is to apply heat in a circle with a given radius according to the distribution of heat source energy in a plane according to the Gaussian function.…”

Numerical Simulation of the Thermo-Mechanical Behavior of 6061 Aluminum Alloy during Friction-Stir Welding

“…It has been shown that the tool shoulder plays a major role in the generation of FSW heat [16]. Accordingly, the welding temperature normally decreases towards the weld root [7,8,[16][17][18][19][20][21][22][23]. In contrast, the temperature distribution in the width direction of the stir zone is often found to be nearly symmetric [8,11,19,[24][25][26][27].…”

Temperature distribution and mechanical properties of FSW medium thickness aluminum alloy 2219

“…Gadakh [11], Yaduwanshi [12], Ghetiya [13], Liu W M [14], Bonifaz [15], Liu X Q [16] based on Schmidt's heat source model, separately studied the effects of rotational speed and welding speed, axial pressure, cone angle of the tool pin, backing plate type and welding inclination angle on the temperature distribution of thin plates. Among them, Ghetiya's research showed that the tensile strength and microhardness of joints are affected by temperature.…”