﻿ TA15钛合金搅拌摩擦焊金属流动的有限元模拟

# TA15钛合金搅拌摩擦焊金属流动的有限元模拟 Finite Element Modeling of Plastic Metal Flow in Friction Stir Welding of TA15 Titanium

Abstract:
Metal flow field around the rotation tool in friction stir welding workpiece is simulated numerically by using finite element method analysis software DEFORM-3D. The welding parameters are as follows: the rotation tool rotates at a rate of 800 rmp, and marches at a speed of 36 mm/min. The whole metal flow field shows that the metal around the rotation tool flows into a hopper-like zone similar to the shape of rotation tool, and the flowing field is asymmetrical with the welding central seam. It is found that linear velocities increase with the radial distance from central axis of welding tool increasing, and material’s flowing ability gets weakened at bottom of workpiece compared to the surface. By changing the rotating rate and marching speed, heat input is affected. Heat input increases with the rotating rate increasing within a certain range, leading to a better flowing ability of metal and a better welding seam forming. The similar conclusion is indicated with the decrease of marching speed.

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