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Surface breaking cracks in resistance spot welds of dual phase steels with electrogalvanised and hot dip zinc coating
Scania CV AB.
RISE, Swerea, Swerea KIMAB.
RISE, Swerea, Swerea KIMAB.
2012 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 18, no 1, p. 25-31Article in journal (Refereed)
Abstract [en]

In normal production of resistance spot welded galvanised structures, it is difficult to completely avoid surface breaking cracks. Known key factors to cause cracking are zinc coating, electrode wear during subsequent welding and insufficient electrode cooling. In this report, an embrittlement mechanism was investigated that could be coupled to the galvanisation method for dual phase steels. With identical bulk material and weld parameters, the first 50 spot welds were crack free with electrogalvanised coating, while only 10 out of 50 were crack free with hot dip galvanised coating. Energy dispersive X-ray spectroscopy analysis of the worn electrode surfaces used for welding of the hot dip galvanised coating revealed areas of aluminium oxide. Since aluminium oxide is a very strong isolator, the electrical resistance will increase, which in turn is suggested to increase the surface temperature of the spot weld and thereby increase the probability for liquid metal embrittlement and surface cracks. © 2013 Institute of Materials, Minerals and Mining.

Place, publisher, year, edition, pages
2012. Vol. 18, no 1, p. 25-31
Keywords [en]
Advanced high strength steel, Liquid metal embrittlement, Resistance spot welding, Surface cracking
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12826DOI: 10.1179/1362171812Y.0000000068Scopus ID: 2-s2.0-84871349725OAI: oai:DiVA.org:ri-12826DiVA, id: diva2:973019
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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Science and technology of welding and joining
Materials Engineering

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