Effects of surface conditions on resistance spot welding of Mg alloy AZ31

L. Liu; S. Q. Zhou; Y. H. Tian; J. C. Feng; J. P. Jung; Y. N. Zhou

doi:10.1179/136217108X394726

Effects of surface conditions on resistance spot welding of Mg alloy AZ31

L. Liu, S. Q. Zhou, Y. H. Tian, J. C. Feng, J. P. Jung, Y. N. Zhou

Department of Materials Science and Engineering

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

32 Scopus citations

Abstract

In this work, resistance spot welding of Mg alloy AZ31 sheets was investigated in as received and acid cleaned surface conditions. As received sheets had higher contact resistance which required lower current thresholds for weld initiation and for four root t nugget size (where t is sheet thickness). However, it also led to both serious expulsion and internal defects. The fracture mode of welds in as received sheets was interfacial failure while that of the acid cleaned specimens shifted from interfacial to nugget pullout and exhibited better strength. The acid cleaned sheets also produced less damage on electrode tip faces.

Original language	English
Pages (from-to)	356-361
Number of pages	6
Journal	Science and Technology of Welding and Joining
Volume	14
Issue number	4
DOIs	https://doi.org/10.1179/136217108X394726
State	Published - May 2009

Keywords

Contact resistance
Magnesium alloy
Resistance spot welding
Surface condition

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abstract = "In this work, resistance spot welding of Mg alloy AZ31 sheets was investigated in as received and acid cleaned surface conditions. As received sheets had higher contact resistance which required lower current thresholds for weld initiation and for four root t nugget size (where t is sheet thickness). However, it also led to both serious expulsion and internal defects. The fracture mode of welds in as received sheets was interfacial failure while that of the acid cleaned specimens shifted from interfacial to nugget pullout and exhibited better strength. The acid cleaned sheets also produced less damage on electrode tip faces.",

keywords = "Contact resistance, Magnesium alloy, Resistance spot welding, Surface condition",

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AU - Liu, L.

AU - Zhou, S. Q.

AU - Tian, Y. H.

AU - Feng, J. C.

AU - Jung, J. P.

AU - Zhou, Y. N.

PY - 2009/5

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N2 - In this work, resistance spot welding of Mg alloy AZ31 sheets was investigated in as received and acid cleaned surface conditions. As received sheets had higher contact resistance which required lower current thresholds for weld initiation and for four root t nugget size (where t is sheet thickness). However, it also led to both serious expulsion and internal defects. The fracture mode of welds in as received sheets was interfacial failure while that of the acid cleaned specimens shifted from interfacial to nugget pullout and exhibited better strength. The acid cleaned sheets also produced less damage on electrode tip faces.

AB - In this work, resistance spot welding of Mg alloy AZ31 sheets was investigated in as received and acid cleaned surface conditions. As received sheets had higher contact resistance which required lower current thresholds for weld initiation and for four root t nugget size (where t is sheet thickness). However, it also led to both serious expulsion and internal defects. The fracture mode of welds in as received sheets was interfacial failure while that of the acid cleaned specimens shifted from interfacial to nugget pullout and exhibited better strength. The acid cleaned sheets also produced less damage on electrode tip faces.

KW - Contact resistance

KW - Magnesium alloy

KW - Resistance spot welding

KW - Surface condition

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JF - Science and Technology of Welding and Joining

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Effects of surface conditions on resistance spot welding of Mg alloy AZ31

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