Original scientific paper

https://doi.org/10.21278/TOF.471032821

Improvement of Weld Bead Characteristics in Gas Metal Arc Welding of SA515 Carbon Steel by Applying Alternating Shielding Gas Flow Technique

Mariappan M. ; Mookambigai College of Engineering, Pudukkottai, Tamil Nadu, India
Parthasarathi N.L. ; Indira Gandhi Centre for Atomic Research - Kalpakkam, Tamil Nadu, India
Ravindran R. ; Akshaya College of Engineering and Technology, Coimbatore, Tamil Nadu, India
Lenin K. ; K. Ramakrishnan College of Engineering, Tiruchirapalli, Tamil Nadu, India
Palanisamy A. ; Surya Engineering College, Erode, Tamil Nadu, India

Abstract

High service temperature of pressure vessel components necessitates the use of welded SA515 grade carbon steel components. The gas metal arc welding (GMAW) process using CO2 as shielding gas is known for its undesirable spatter behaviour and inferior weld quality. The alternating shielding gas flow (ASGF) technique is proposed in this study using the shielding gases, viz. CO2 and argon to overcome this difficulty. The welding current, stand-off distance, and shielding gas flow were all varied to improve the bead-on-plate profile geometry. The bead profile parameters such as depth of penetration, bead width, and bead height are considered as weld bead parameters. The following methods are used: correlation analysis, analysis of variance (ANOVA), modelling, and grey relational analysis (GRA). According to the findings, the welding current and ASGF are the most influential parameters impacting the weld bead characteristics. By increasing the welding current, the bead profile parameters increase linearly. The geometry of the bead profile was improved by using the GRA.

Keywords

GMAW; alternating shielding gas flow (ASGF); weld bead geometry; correlation; analysis of variance

Hrčak ID:

300292

URI

https://hrcak.srce.hr/300292

Publication date:

19.4.2023.

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