R. Sasidharan, C. Rajendran, Tushar Sonar, Mikhail Ivanov
{"title":"Investigation on tensile strength of CMT and P-CMT joints of AA8011 aluminum alloy","authors":"R. Sasidharan, C. Rajendran, Tushar Sonar, Mikhail Ivanov","doi":"10.1680/jemmr.23.00102","DOIUrl":null,"url":null,"abstract":"The advanced variant of gas metal arc welding (GMAW) known as cold metal transfer (CMT) developed by Fronius in Austria is used to overcome the heat input and fusion related issues such as porosity and cracking in welding of AA8011-H18 alloy sheets. The 3 mm thick sheets of AA8011-H18 alloy were welded using normal CMT-GMAW and pulsed CMT (PCMT-GMAW) processes. The microstructure of weld metal (WM) and heat affected zone (HAZ) was analysed using optical microscope. The tensile properties and hardness of joints were evaluated and compared. Results revealed that the PCMT-GMAW joints showed 26.45%, 48.97% and 40.42% improvement in tensile strength, yield strength and elongation compared to CMT-GMAW joints. The superior tensile performance of PCMT-GMAW joints compared to CMT-GMAW joints is due to the current pulsing effects along with wire retraction mechanism which aids in reducing the heat input and controlled droplet transfer.","PeriodicalId":11537,"journal":{"name":"Emerging Materials Research","volume":null,"pages":null},"PeriodicalIF":1.3000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Emerging Materials Research","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1680/jemmr.23.00102","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The advanced variant of gas metal arc welding (GMAW) known as cold metal transfer (CMT) developed by Fronius in Austria is used to overcome the heat input and fusion related issues such as porosity and cracking in welding of AA8011-H18 alloy sheets. The 3 mm thick sheets of AA8011-H18 alloy were welded using normal CMT-GMAW and pulsed CMT (PCMT-GMAW) processes. The microstructure of weld metal (WM) and heat affected zone (HAZ) was analysed using optical microscope. The tensile properties and hardness of joints were evaluated and compared. Results revealed that the PCMT-GMAW joints showed 26.45%, 48.97% and 40.42% improvement in tensile strength, yield strength and elongation compared to CMT-GMAW joints. The superior tensile performance of PCMT-GMAW joints compared to CMT-GMAW joints is due to the current pulsing effects along with wire retraction mechanism which aids in reducing the heat input and controlled droplet transfer.
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Materials Research is constantly evolving and correlations between process, structure, properties and performance which are application specific require expert understanding at the macro-, micro- and nano-scale. The ability to intelligently manipulate material properties and tailor them for desired applications is of constant interest and challenge within universities, national labs and industry.
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