• Ahmed, Mohammad Hassan
• Abdel-Aleem, Hamed Ahmed
• Abbass, Mahmoud Ibrahim
• Ahmed, Essam

Abstract

<jats:title>Abstract</jats:title><jats:p>In this research, the electro-gas welding process (EGW) was compared with a shielded metal arc welding process (SMAW) from a mechanical properties point of view. Visual and radiographic inspections confirmed the soundness of weldments produced by both EGW and SMAW techniques. Various assessments, including hardness, tensile strength, V-notch impact toughness, macrostructure, microstructure, and electrochemical tests, were performed. The mechanical properties of the two welding processes were closely matched, with an average tensile strength of 590 MPa for EGW and 585 MPa for SMAW. The impact of welding variables, such as groove design and heat input, on the quality, mechanical properties, and electrochemical behavior of the welded joints was thoroughly examined. Dilution estimates, particularly for the EGW process, were around 35%, and a significant similarity was observed between the chemical composition determined through dilution calculations and that obtained from chemical analysis using an arc spark emission spectrometer. Notably, the EGW process demonstrated exceptional productivity, surpassing the SMAW process by more than 11 times. The optimal welding parameters for the EGW process were identified to achieve superior mechanical properties, low corrosion rates, and reduced consumption of the welding electrodes. This included adopting a single V type and groove angle of 300 instead of 600, resulting in a 23% reduction in economic costs. Selecting an appropriate heat input within the range of 12 to 14 kJ/mm further contributed to enhancing overall welding efficiency.&amp;#xD;</jats:p>

Topics

• microstructure
• corrosion
• strength
• steel
• hardness
• chemical composition
• tensile strength