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Metals 2016, 6(9), 205; doi:10.3390/met6090205

Improvement in the Design of Welded Joints of EN 235JR Low Carbon Steel by Multiple Response Surface Methodology

1
Department of Mechanical Engineering, University of La Rioja, Logroño 26004, La Rioja, Spain
2
Built Environment and Engineering, Leeds Beckett University, Leeds LS1 3HB, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo Lopez
Received: 23 June 2016 / Revised: 3 August 2016 / Accepted: 24 August 2016 / Published: 30 August 2016
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Abstract

Gas metal arc welding (GMAW) is a joining process that is controlled by several inputs or welding parameters. However, speed, current and voltage are the parameters that are most frequently used in setting this process. Cord area, yield stress, tensile strength, residual stresses, hardness and roughness are considered to be outputs or welded joints parameters. They are widely used when the design requirements are based on the cost, manufacturing speed, strength and surface finish. This paper seeks to determine the relationship between the welding parameters and the welded joint parameters of speed, current and voltage in butt joints (X-groove) of EN 235JR by the response surface method (RSM). The optimal joints when considering the design requirements of cost, manufacturing speed, strength and surface finish were achieved by using the multi-response surface (MRS). The optimal welding parameters reached when considering the design requirements of cost were 140.593 amps, 8.192 mm/s and 29.999 volts, respectively, whereas the design requirements of manufacturing speed were 149.88 amps, 9.261 mm/s and 29.999 volts. Finally, the welding parameters for the design requirements of joint strength and surface finish were 149.086 amps, 7.139 mm/s and 28.541 volts and 150.372 amps, 8.561 mm/s and 29.877 volts, respectively. View Full-Text
Keywords: modelling and optimizing welded joints; multiple response surface methodology; residual stresses; tensile strength; hardness; roughness modelling and optimizing welded joints; multiple response surface methodology; residual stresses; tensile strength; hardness; roughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lostado Lorza, R.; Escribano García, R.; Martínez Calvo, M.Á.; Múgica Vidal, R. Improvement in the Design of Welded Joints of EN 235JR Low Carbon Steel by Multiple Response Surface Methodology. Metals 2016, 6, 205.

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