Heat and mass transfer in laser dissimilar welding of stainless steel and nickel

被引：97

作者：

Hu, Yaowu ^{[1
]}

He, Xiuli ^{[1
]}

Yu, Gang ^{[1
]}

Ge, Zhifu ^{[1
]}

Zheng, Caiyun ^{[1
]}

Ning, Weijian ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2012年 / 258卷 / 15期

关键词：

Laser dissimilar welding; Heat transfer; Mass transfer; Fluid flow; METAL COMPOSITION CHANGE; SURFACE-ACTIVE ELEMENT; POOL DEVELOPMENT; PHASE-CHANGE; MOLTEN POOL; SOLUTE TRANSPORT; MARANGONI FLOW; SOLIDIFICATION; CONVECTION; MOMENTUM;

D O I：

10.1016/j.apsusc.2012.02.143

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Laser spot welding of stainless steel-nickel dissimilar couple has been studied experimentally and numerically. A three-dimensional heat and mass transfer model is used to simulate the welding process, based on the solution of the equations of mass, momentum, energy conservation and solute transport in weld pool. The calculated fusion zone geometry and element distributions are in good agreement with the corresponding experimental results. The role of fluid flow on temperature field and its evolution is analyzed by comparing two cases with and without considering convection. Temperature fields far away from the weld pool are quite similar, but exhibit large difference close to the heat source. During the early stage after formation of weld pool, the distribution of element Fe in weld pool is non-uniform, due to insufficient time for mixing. The speed for mass transport is the highest during the initial stage of weld pool formation and it decreases with time. Both heat and mass transport are significantly influenced by convection during laser spot welding of stainless steel and nickel. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：5914 / 5922

页数：9

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