Assessment of Tensile Strength, Hardness and Impact Toughness of API 5L Grade X65 Carbon Steel Pipe Welded Joints at the HAZ using TIG and SMAW Techniques

Stanley Okiy; Benjamin Ufuoma Oreko

Stanley Okiy Department of Welding Engineering and Offshore Technology, Petroleum Training Institute Effurun, Delta State, Nigeria
Benjamin Ufuoma Oreko Deptartment of Mechanical Engineering, Federal University of Petroleum Resources, Effurun, Delta State, Nigeria

Keywords: Carbon Steel pipe, TIG, SMAW, Heat Affected Zone, Taguchi Design

Abstract

This study examines the mechanical properties namely tensile strength, hardness and impact toughness of API 5L grade X65 carbon steel pipe at the Heat Affected Zone (HAZ) using Tungsten Inert Gas (TIG) and Shielded Metal Arc Welding (SMAW) processes. The welding parameters considered in this study were Voltage (V), Current (A) and Travel/Welding Speed (cm/min). The results obtained show that TIG welded joints at the HAZ had an optimum value for tensile strength, hardness and impact toughness of 5.879x10⁵kN/m², BHN 198.6 and 160 J/m²_,respectively. In contrast, the optimum for SMAW welded joints at the HAZ shows the tensile strength, hardness and impact toughness of 5.2235x10⁵kN/m², BHN 196.7 and 134 J/m²_,respectively. Equally too, Taguchi analysis ranked travel/welding speed, current and voltage as first, second and third, respectively, to be considered as significant to achieve optimum value at the HAZ for UTS when using TIG and SMAW techniques whereas, for hardness and impact toughness, consideration could be given to voltage first, closely followed by current and travel speed, respectively. Hence, the welding parameters considered in this study could influence the properties of API 5L grade X65 carbon steel pipe at the heat-affected zone.

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