Prediction of solidification cracking in pulsed laser welding of 2024 aluminum alloy

被引：118
作者：
Sheikhi, M. [1 ]
Ghaini, F. Malek [1 ]
Assadi, H. [1 ]
机构：
[1] Tarbiat Modares Univ, Dept Mat Engn, Tehran, Iran
来源：
ACTA MATERIALIA | 2015年 / 82卷
关键词：
Welding; Aluminum alloy; Laser treatment; Hot cracking criteria; Modeling; MECHANICAL-PROPERTIES; HOT CRACKING; MODEL;
D O I：
10.1016/j.actamat.2014.09.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser welding of aluminum alloys can be associated with solidification cracking. The severity of cracking in these alloys depends on various factors, such as the initial temperature of the base metal and the temporal amplitude of the laser pulse. The purpose of this investigation is to understand this correlation, and thus to put forward a criterion for solidification cracking in laser welding of 2024 aluminum alloy. The criterion for cracking is devised based on a modification of the existing criteria, to account for non-steady conditions, and interpreted with respect to the loci of the relevant isotherms and the length of the vulnerable zone in the melt pool, during the solidification stage. Based on this criterion and the respective experimental observations, it is demonstrated that welding with suitable ramping down of the laser pulse can lead to the elimination of solidification cracking in the examined alloy. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：491 / 502
页数：12
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