Mechanical properties and microstructures of resistance spot welded DP980 steel joints using pulsed current pattern. (January 2014)

• Record Type: Journal Article
• Authors: Sawanishi, C.; Ogura, T.; Taniguchi, K.; Ikeda, R.; Oi, K.; Yasuda, K.; Hirose, A.
• Is Part Of: Science and technology of welding & joining. Volume 19:Number 1(2014:Jan.)
• Page Start: 52
• Page End: 59
• Publication Date: 2014-01
• Subjects: Welding -- Periodicals; Joints (Engineering) -- Periodicals; Surfaces (Technology) -- Periodicals; 671.52
• DOI: 10.1179/1362171813Y.0000000165
• Languages: English
• ISSNs: 1743-2936

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>Dual phase 980 MPa grade (DP980) steel sheets were resistance spot welded using a pulsed current, and the effects of the pulsed current on the strength properties of the joints were investigated. The pulsed current improved the mechanical properties of the joints in cross tensile tests. <italic>In situ</italic> observations during tear tests revealed that the ductility of the nugget was improved and that the propagation of cracks into the nugget was inhibited when the pulsed current was used. Microstructural observations and electron probe microanalysis (EPMA) of the nugget showed that the segregation of phosphorus at the nugget was reduced in the joint welded using the pulsed current, suggesting that the pulsed current improved the ductility of the nugget by altering their microstructures.</p> </abstract>