Experimental relationship of tensile strength and hardness of welded structural steel

Calderón, L.; Bohórquez, O.; Rojas, Mario A.; Pertuz, A.

doi:10.1088/1742-6596/2046/1/012065

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…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]. Other studies reported the hardness and microstructure of the welding regionsthe fusion zone (FZ) and the heat affected zone (HAZ)-and related their effect on the tensile strength of welding.…”

Section: Introductionmentioning

confidence: 94%

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

Elfallah

2023

Jurnal Teknologi

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Gas metal arc welding is a leading process in fusion welding with increased productivity and good quality. The welding parameters are crucial in determining welding quality, cost, and productivity. In this study, mild steel with a 10-mm-thick sheet was welded by gas metal arc welding under predetermined parameters of welding voltage, wire feed speed, and groove shape. The analysis made by Taguchi’s design to investigate the effect of these parameters on tensile strength and Vickers micro-hardness of welding. The microstructure of the fusion zone and heat-affected zone is analyzed to monitor their change concerning the mechanical properties. The results showed that tensile strength decreased with decreased hardness. Also, the tensile strength and hardness were higher (a maximum of 305 MPa and 2170 HVN) at welding made at a lower voltage (20 volts), lower wire feed speed (5.9 m/min), and V-shaped base metal groove. The increased precipitation of perlite structure was shown during welding, which has lower tensile strength and hardness. Widmanstatten ferrite and coarser α-ferrite were presented for welding with a lower cooling time. Taguchi’s design showed that voltage at 20 volts has the highest effect on tensile strength, followed by wire feed speed at 5.9 m/min and V-shaped welding.

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Section: Introductionmentioning

confidence: 94%

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

Elfallah

2023

Jurnal Teknologi

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“…Several researchers studied the effect of GMAW variables on the mechanical properties [3][4][5][6][7][8][10][11][12][13][14][15][16][17] and microstructure [4-6, 9, 10, 15] of mild steel welding. The welding tensile strength [3, 5-8, 10-12, 14-17] and hardness [3-8, 10, 13, 15, 16] are important mechanical properties that affect the quality of the welding and have been studied intensely.…”

Section: Introductionmentioning

confidence: 99%

“…The tensile strength and hardness of FZ and HAZ were also studied, due to the different properties of the welding and adjacent regions; they affect the mechanical properties of welding. In general, the tensile strength of welding is reported to be higher than the base metal [3,5,7], while it has shown lower toughness [3,5,7,17]. Multiple studies showed that FZ has a lower hardness than HAZ [5,8,9,10,13,15], and the base metal has a lower hardness than FZ and HAZ [3,5,8,10,13,15].…”

Section: Introductionmentioning

confidence: 99%

“…In general, the tensile strength of welding is reported to be higher than the base metal [3,5,7], while it has shown lower toughness [3,5,7,17]. Multiple studies showed that FZ has a lower hardness than HAZ [5,8,9,10,13,15], and the base metal has a lower hardness than FZ and HAZ [3,5,8,10,13,15]. The HAZ was shown to have higher yield strength than FZ and base metal [5,6,25].…”

Section: Introductionmentioning

confidence: 99%

“…The HAZ was shown to have higher yield strength than FZ and base metal [5,6,25]. However, Calderón et al [3] found that FZ has higher hardness than HAZ. Studies confirm that the microstructure behavior of welding affects their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties Analysis of Mild Steel with Different Groove Shape Welded Using GMAW

Elfallah

Allafi²

2023

MSF

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This paper will discuss the effect of welding variables on the transverse tensile strength and hardness of mild steel welding made by GMAW. The welding variables included are base metal thickness, welding voltage, wire feed speed (WFS), and base metal groove shape. The results show that higher welding transverse tensile strength has obtained higher FZ hardness, while they both increased with decreased welding heat input. E.g., the highest tensile strength (238 MPa) has shown 2162 HV at 768 J/mm heat input, while the lowest tensile strength (120 MPa) of welding made at 2376 J/mm has shown 2108 HV. The FZ of welding made at V groove-shaped base metal has higher hardness and transverse tensile strength, as shown 2159.5 HV and 215 MPa in order when compared to 177 MPa and 2147 HV for X groove-shaped. The hardness at V groove-shaped FZ had an average of 2159.5 HV, while the hardness at X groove-shaped had an average of 2147 HV at 10 mm base metal thickness. The increased hardness of V groove-shaped FZ could be related to the increased stresses at V groove-shaped due to interpass heat input. The intricate physical shape of FZ and HAZ for X groove configuration possibly contributes to the lower transverse tensile strength of welding. A favorably increased hardness and transverse tensile strength are associated with softer and finer ferritic and perlitic grains in FZ and less dendritic perlite structure in HAZ. The Widmanstatten ferrite has contributed to decreased tensile strength.

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Experimental relationship of tensile strength and hardness of welded structural steel

Cited by 2 publications

References 5 publications

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

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

Microstructure and Mechanical Properties Analysis of Mild Steel with Different Groove Shape Welded Using GMAW

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