Kumar, Nikhil, Dhara, Sisir, Masters, Iain and Das, Abhishek (2022) Substituting resistance spot welding with flexible laser spot welding to join ultra-thin foil of Inconel 718 to thick 410 steel. Materials, 15 (9). p. 3405. doi:10.3390/ma15093405 ISSN 1996-1944.

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Abstract

This paper investigated various aspects of replacing existing micro-resistance spot welding (micro-RSW) with micro-laser spot welding for joining Inconel 718 thin foils to thick 410 steel stack-up to allow faster, non-contact joining together with flexibility in spot positioning and removal of tip dressing required for RSW electrodes. The joint quality was evaluated based on the mechanical strength, microstructural characteristics and joint strength at elevated temperature as these joints are often used for high-temperature applications. Experimental investigations were performed using micro-RSW and micro-laser spot welding to obtain the 90° peel and lap shear specimens, each comprising four spots. The obtained strength from laser joints was significantly higher than that of micro-RSW joints due to larger weld nugget formation and interface width. The process map for obtaining good quality welds was also identified, and about a 17% reduction in joint strength was obtained when welded specimens were subjected to elevated temperature (i.e., 500 °C) in comparison with room temperature. This reduction was compensated for using the flexibility of laser welding to add two extra spots. The overall performance of the micro-laser spot welds was found to be better than the micro-RSW considering joint strength, flexibility in placing the spots and time to produce the welds.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TS Manufactures
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Electric welding , Electric welding -- Electrodes, Inconel , Inconel -- Welding, Heat resistant alloys -- Welding
Journal or Publication Title:	Materials
Publisher:	M D P I AG
ISSN:	1996-1944
Official Date:	May 2022
Dates:	Date Event May 2022 Published 9 May 2022 Available 7 May 2022 Accepted 1 April 2022 Submitted
Volume:	15
Number:	9
Page Range:	p. 3405
DOI:	10.3390/ma15093405
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	7 June 2022
Date of first compliant Open Access:	8 June 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID UNSPECIFIED University of Warwick http://dx.doi.org/10.13039/501100000741

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