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Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds

Resistance spot welds of dual phase (DP) steels are prone to low fracture toughness due to the formation of brittle martensitic structure in the fusion zone (FZ). In-process tempering of martensite via applying second pulse current is considered a new pathway to improve mechanical performance of the...

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Main Authors: Soomro, I.A., Pedapati, S.R., Awang, M.
Format: Article
Published: Elsevier Ltd 2021
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098959159&doi=10.1016%2fj.msea.2020.140713&partnerID=40&md5=f1fe1ad25e5ada19e58cd5446a240e75
http://eprints.utp.edu.my/23692/
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spelling my.utp.eprints.236922021-08-19T08:20:10Z Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds Soomro, I.A. Pedapati, S.R. Awang, M. Resistance spot welds of dual phase (DP) steels are prone to low fracture toughness due to the formation of brittle martensitic structure in the fusion zone (FZ). In-process tempering of martensite via applying second pulse current is considered a new pathway to improve mechanical performance of the welds. The success of in-process tempering depends upon precise controlling the amount of heat input and uniform temperature distribution which in turn influenced by postweld tempering pulse parameters. This paper aims to investigate the effect of three postweld tempering pulse parameters such as welding current, welding time and cooling time applied after main pulse current on microstructure and mechanical properties of DP590 steel resistance spot weld. Mechanical properties in terms of peak load and failure energy were determined after performing cross tension (CT) test. Taguchi quality design based on L16 orthogonal array has been used to determine the optimum conditions for maximum peak load and failure energy. Moreover, microstructure-property relationship is also studied. The results show that at optimum conditions maximum improvement of 62 in peak load and 62.3 in failure energy is achieved in double pulse welds compared with conventional single pulse weld. It was found that improvement in peak load and failure energy resulted from (i) enhanced weld nugget size (WNS) and (ii) tempering of martensite in FZ and heat affected zone (HAZ). These factors are influenced by heat input (Q) during postweld heating cycle (PWHC) which in turn increased with increasing second pulse current and time. © 2020 Elsevier B.V. Elsevier Ltd 2021 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098959159&doi=10.1016%2fj.msea.2020.140713&partnerID=40&md5=f1fe1ad25e5ada19e58cd5446a240e75 Soomro, I.A. and Pedapati, S.R. and Awang, M. (2021) Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds. Materials Science and Engineering A, 803 . http://eprints.utp.edu.my/23692/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Resistance spot welds of dual phase (DP) steels are prone to low fracture toughness due to the formation of brittle martensitic structure in the fusion zone (FZ). In-process tempering of martensite via applying second pulse current is considered a new pathway to improve mechanical performance of the welds. The success of in-process tempering depends upon precise controlling the amount of heat input and uniform temperature distribution which in turn influenced by postweld tempering pulse parameters. This paper aims to investigate the effect of three postweld tempering pulse parameters such as welding current, welding time and cooling time applied after main pulse current on microstructure and mechanical properties of DP590 steel resistance spot weld. Mechanical properties in terms of peak load and failure energy were determined after performing cross tension (CT) test. Taguchi quality design based on L16 orthogonal array has been used to determine the optimum conditions for maximum peak load and failure energy. Moreover, microstructure-property relationship is also studied. The results show that at optimum conditions maximum improvement of 62 in peak load and 62.3 in failure energy is achieved in double pulse welds compared with conventional single pulse weld. It was found that improvement in peak load and failure energy resulted from (i) enhanced weld nugget size (WNS) and (ii) tempering of martensite in FZ and heat affected zone (HAZ). These factors are influenced by heat input (Q) during postweld heating cycle (PWHC) which in turn increased with increasing second pulse current and time. © 2020 Elsevier B.V.
format Article
author Soomro, I.A.
Pedapati, S.R.
Awang, M.
spellingShingle Soomro, I.A.
Pedapati, S.R.
Awang, M.
Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
author_facet Soomro, I.A.
Pedapati, S.R.
Awang, M.
author_sort Soomro, I.A.
title Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
title_short Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
title_full Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
title_fullStr Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
title_full_unstemmed Optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (DP590) steel resistance spot welds
title_sort optimization of postweld tempering pulse parameters for maximum load bearing and failure energy absorption in dual phase (dp590) steel resistance spot welds
publisher Elsevier Ltd
publishDate 2021
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098959159&doi=10.1016%2fj.msea.2020.140713&partnerID=40&md5=f1fe1ad25e5ada19e58cd5446a240e75
http://eprints.utp.edu.my/23692/
_version_ 1738656508166537216
score 13.211869

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