Study on the influence of groove shape on the tensile strength of commercial steel

Abstract

In industry, welding is well known. There is a great demand for effective and quality welding. Manufacturers seek to remain competitive in the market. They rely on their manufacturing engineers and production personnel to quickly and effectively set up manufacturing processes for new products. Gas metal arc welding is one of the most widely used processes in the industry. Input factors such as welding current, welding voltage, Gas flow rate, wire feed speed, wire size and welding speed play a significant role in determining the welding quality. Taguchi's design has been a powerful and efficient optimization tool for better quality and performance output of manufacturing processes. In this study, Gas metal arc welding has welded commercial steel under preset factors of welding voltage, wire feed speed and groove shape. Base metal groove shape X welding obtained lower tensile strength and hardness than base metal groove shape V. Taguchi's design is to determine the optimal process factors for higher tensile strength and hardness. The analysis found that welding groove shape V had higher effect on the tensile strength and hardness of the welding, while the welding voltage has obtained higher tensile strength and hardness values. The optimum combination of welding factors was base metal groove shape V, 20 V and wire feed speed of 5.9 m/min.

Study the Influence of Welding Parameters by Taguchi’s Design on the Mechanical Properties of Welded Mild Steel (S235jr)

“…Previous similar studies concluded that tensile strength increased with decreasing welding voltage, welding current, and WFS [19,20,21]. The groove shape was also reported to affect the mechanical properties of welding, where V-shaped welding obtained higher tensile strength and hardness than double V-shaped welding [20].…”

“…The relationship between tensile strength and hardness was reported before [19,20,21]. Calderón et al (2021) concluded that the tensile strength and hardness of FZ and HAZ were also studied because they affect the mechanical properties of welding due to the different properties of the welding and adjacent regions [22].…”

“…Researchers have studied the effect of welding parameters according to Taguchi's design on the mild steel welding tensile strength and hardness [14,15,16,17,18,19,20,21]. For instance, in the study on welding penetration depth, Ogbonna et al (2023) found that welding voltage has the highest influence on the tensile strength of AISI 1008 mild steel heterogeneous welding over welding current and gas flow rate [14]; Om Prakash et al (2019) found that welding WFS had a higher effect on the tensile strength of AISI 11040 steel welding over the welding voltage and welding speed [15]; and Assefa et al…”

“…Another study by Khan et al (2020) found that welding current has a higher influence on EN8 mild steel with dissimilar welding hardness [17]; Khamari et al (2019) stated that a higher current contributed to a higher welding tensile strength [18]. Previous similar studies concluded that tensile strength increased with decreasing welding voltage, welding current, and WFS [19,20,21]. The groove shape was also reported to affect the mechanical properties of welding, where V-shaped welding obtained higher tensile strength and hardness than double V-shaped welding [20].…”

Effect of GTAW on the Tensile Strength and Hardness of Mild Steel

“…However, Talabi et al [12] concluded that the welding that has higher tensile strength has lower hardness. In general, both the tensile strength and hardness of the welding decrease with the increase of the welding voltage and current [13,14]. Because of the increase, it increases the heat input in the weld pool, causing internal stresses in the fusion zone (FZ) and HAZ and consequently the welding's mechanical properties' deterioration such as tensile strength and hardness while the toughness increases [11].…”