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

Shaohua Yan; Hui Chen; Chuanping Ma; Yuan Nie; Xiaomin Wang; Qing H. Qin

doi:10.1016/j.matdes.2015.08.140

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

Shaohua Yan, Hui Chen^*, Chuanping Ma, Yuan Nie, Xiaomin Wang, Qing H. Qin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1353-1365
Number of pages	13
Journal	Materials and Design
Volume	88
DOIs	https://doi.org/10.1016/j.matdes.2015.08.140
Publication status	Published - 25 Dec 2015

Access to Document

10.1016/j.matdes.2015.08.140

Cite this

@article{aa15c10bf1524355a899f5581c8da40d,

title = "Local corrosion behaviour of hybrid laser-MIG welded Al-Zn-Mg alloy joints",

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.",

keywords = "Aluminium alloys, Hybrid laser-MIG welding, SCC",

author = "Shaohua Yan and Hui Chen and Chuanping Ma and Yuan Nie and Xiaomin Wang and Qin, {Qing H.}",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = dec,

day = "25",

doi = "10.1016/j.matdes.2015.08.140",

language = "English",

volume = "88",

pages = "1353--1365",

journal = "Materials and Design",

issn = "0264-1275",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Local corrosion behaviour of hybrid laser-MIG welded Al-Zn-Mg alloy joints

AU - Yan, Shaohua

AU - Chen, Hui

AU - Ma, Chuanping

AU - Nie, Yuan

AU - Wang, Xiaomin

AU - Qin, Qing H.

PY - 2015/12/25

Y1 - 2015/12/25

N2 - 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.

AB - 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.

KW - Aluminium alloys

KW - Hybrid laser-MIG welding

KW - SCC

UR - http://www.scopus.com/inward/record.url?scp=84944382427&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2015.08.140

DO - 10.1016/j.matdes.2015.08.140

M3 - Article

SN - 0264-1275

VL - 88

SP - 1353

EP - 1365

JO - Materials and Design

JF - Materials and Design

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this