Transactions of Materials and Heat Treatment

Title：nfluence of mold structure on welding pressure in angular porthole extrusion for AZ91 magnesium alloy pipe based on FEM

Authors： Dang Li1 Li Yunfan2 Wang Rui3 Shan Chenchen1 Ma Yaoli1 Ma Shenglong2

Unit： 1.School of Aeronautics Engine Zhengzhou Universit y of Aeronautics 2. School of Modern Information Technology Henan Vocational Technology College 3. School of Electronics and Internet Henan Vocational Technology College

KeyWords： magnesium alloy pipe porthole extrusion angular welding chamber die structure welding compressive stress

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):89-95

Abstract：

The porthole extrusion mold for angular welding chamber of magnesium alloy pipe was designed by combining the shear deformation principle of angular extrusion with porthole extrusion of magnesium alloy pipe, and the new mold increased the effective height of the welding chamber and the welding time under the premise of ensuring the rigidity of extrusion needle, which was beneficial to improve the welding performance of welding seam. Then, the finite element model of porthole extrusion for the angular welding chamber of AZ91 magnesium alloy pipe was developed based on DEFORM finite element platform, and its reliability was verified. Furthermore, the influence laws of rotation angle, porthole bridge structure and die structure size on the average compressive stress in the welding chamber were revealed based the finite element model.The results show that the average compressive stress in the welding chamber increases gradually with the increasing of rotation angle β of porthole mold and diestructure size a. For the raindrop-shaped porthole bridge structure, with the increasing of porthole bridge taper γ, the average compressive stress in the welding chamber increases, but the increase is not obvious.

Funds：

河南省科技攻关项目（212102210450）；郑州航院校级教改项目（zhjy21-(01-100)）作者简介：党利(1982-)，男，博士，讲师 E-mail：dangli8868@163.com

李奎（1989-），男，硕士，工程师 E-mail：615804786@qq.com

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