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Local corrosion behaviour of hybrid laser-MIG welded Al-Zn-Mg alloy joints

Date

2015

Authors

Yan, Shaohua
Chen, Hui
Ma, Chuanping
Nie, Yuan
Wang, Xiaomin
Qin, Qing Hua

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

The local corrosion behaviour of a hybrid laser-metal-inert-gas (MIG) welded Al–Zn–Mg alloy joint is studied using pre-cracked bending samples immersed in 3.5% NaCl solution. To gain insight into the SCC susceptibility in different zones including the base metal (BM), heat affected zone (HAZ) and fusion zone (FZ), the corrosion surface, fractured surface and SCC propagation are investigated experimentally. The results illustrate that the BM in natural ageing (NA) state is more prone to induce SCC than the HAZ, a finding that differs from previous reports that the HAZ is more prone to induce SCC. The reason is explained via the welding process and corrosion method. Influence of post-weld heat treatment (PWHT) on SCC resistance of the hybrid laser-MIG Al–Zn–Mg joint is examined as well. The results show that the resistance of the welded joint to SCC can be enhanced by PWHT. The microstructure change due to PWHT is shown to be responsible for this improvement.

Description

Keywords

Citation

Source

Materials and Design

Type

Journal article

Book Title

Entity type

Access Statement

License Rights

DOI

10.1016/j.matdes.2015.08.140

Restricted until

2037-12-31