An Investigation of TIG welding parameters on microhardness and microstructure of heat affected zone of HSLA steel

Musa, M.; Maleque, Md. Abdul; Ali, Mohammad Yeakub

doi:10.1088/1757-899x/290/1/012041

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Musa et al investigated the effect of GTAW parameters on the microstructure and microhardness of the HAZ in L450 HSLA steel. It was concluded that welding parameters had a massive effect on the hardness profile and microstructural features of welds [16]. The increase of welding heat input resulted in an increase in the width of HAZ and the growth of prior austenite grains.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Input on Microstructure and Mechanical Properties of Gas Tungsten Arc Welded HSLA S500MC Steel Joints

Kornookar

Nematzadeh

Mostaan

et al. 2022

Metals

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High-strength low alloy (HSLA) S500MC steel is widely used for chassis components, structural parts, and pressure vessels. In this study, the effects of heat input during automatic gas tungsten arc welding (GTAW) on microstructure and mechanical properties of thermomechanically controlled processed (TMP) S500MC steel were investigated. A butt joint configuration was used, and welding was performed in autogenous mode. Six different levels of heat input namely 1.764 kJ/mm, 1.995 kJ/mm, 2.035 kJ/mm, 2.132 kJ/mm, 2.229 kJ/mm, and 2.33 kJ/mm were considered. Microstructural investigations revealed a different microstructure than base metal in the fusion zone (FZ) of all welded joints which was most likely due to a lath martensitic microstructure surrounded by retained austenite. With increased heat input, the amount of retained austenite and the size of packets increased. In the heat-affected zone (HAZ), two distinct regions of coarse grain (CG-HAZ) and fine grain (FG-HAZ) were observed. Due to the presence of carbides in the HAZ, mostly a martensitic microstructure with smaller packets, compared to FZ, was formed. By increasing the heat input and through the dissolution of carbides, the dimension of packets increased. Due to microstructural changes and grain growth, in both the FZ and the HAZ, the mechanical properties produced by TMP were lost in these regions. However, failure occurred in the base metal of all samples with a maximum tensile strength of 690 MPa. Thus, tensile strength in the weld zone and HAZ were higher than the base metal even for the highest heat input indicating the formation of a good joint between S500MC plates with GTAW, regardless of heat input.

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Section: Introductionmentioning

confidence: 99%

Influence of Heat Input on Microstructure and Mechanical Properties of Gas Tungsten Arc Welded HSLA S500MC Steel Joints

Kornookar

Nematzadeh

Mostaan

et al. 2022

Metals

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“…6 With the scanning electron microscopy (SEM) investigations found that the delta ferrite was reduced with the increase in the heat input whereas the inter-dendrite length increased with the increased heat input. 6,7 To get maximum impact strength and hardness of welded joints, the effect of welding process parameters on micro-hardness, depth and microstructure of L450 HSLA steel was studied 8 and it was reported that that the increase in welding speed from 1 to 2.5 mm/s tends to increase in micro-hardness whereas decrease in the width of HAZ. 9 Codes and standards of assembly of pipe and repair associate the hardness of weld metal and HAZ with the option of SCC failure.…”

Section: Introductionmentioning

confidence: 99%

On mechanical and morphological investigations of tungsten inert gas welded SS 304 thin pipe joints

Arora

Singh

Brar

2020

Measurement and Control

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Tungsten inert gas welding is one of the established joining processes for stainless steel. But hitherto very little has been reported on induced residual stresses in circular thin pipe joints during tungsten inert gas welding of SS 304. This paper reports the effect of welding parameters such as welding speed, welding current and shielding gas flow rate of tungsten inert gas welding on micro-hardness, width of the heat-affected zone, residual stresses and microstructural properties of SS 304 thin pipe joints. The results indicate that the welding current and the welding speed have a significant effect on micro-hardness of weld bead and width of the heat-affected zone. Further changes in the microstructure of the joints were studied in terms of dendrite formation. It has been observed that there is proportional increase in depth/width of the heat-affected zone with the heat input during the joining process, resulting in a decrease of micro-hardness. The results are also supported by radiographic analysis and X-ray diffraction data to understand the nature of residual stresses which was observed as compressive at the weld bead and tensile along the axis of thin welded pipe joints. Finally, the process capability analysis based on Cp and Cpk values of ≥1 suggests that the process can be gainfully used for mass production.

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“…Under various welding conditions, some problems, such as cold cracking in welded joints and the toughness of heat-affected zone (HAZ) is asked to improve, and crack is prevented [1][2][3][4][5]. Because HAZ undergoes welding thermal cycling, its properties are different from those of base metal, and directly affect whether the welded joints can be safely applied [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and properties of reheated coarse grain heat-affected zone of 900 MPa grade HSLA steel

Qin¹,

Qiao²,

Wu³

et al. 2020

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The welding thermal simulation technology was used to simulate secondary thermal cycle of coarse grain heat-affected zone (CGHAZ) of BWELDY960Q steel, and the change of microstructure and toughness in CGHAZ after reheating was studied in detail. The results show that when the peak temperature of the secondary thermal cycle is 1200 and 1000 • C, the microstructure of reheated coarse grain heat-affected zone (RCGHAZ) is martensite; when the peak temperature is 800 • C, the microstructure of RCGHAZ constitutes of martensite, granular bainite and M-A constituent. The toughness of CGHAZ is improved undergoing secondary thermal cycle, but it is still lower than that of base metal. Compared with the mechanical properties of CGHAZ, the hardness values of inter-critical and sub-critical RCGHAZ are decreased, while the toughness of super-critical and sub-critical RCGHAZ is increased. Impact fracture exhibits evident plastic deformation, the edge of fracture has tearing edges and corners, and microscopic morphology presents the characteristics of dimp fracture. K e y w o r d s : HSLA steel, reheated coarse grain heat-affected zone, microstructure, properties

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An Investigation of TIG welding parameters on microhardness and microstructure of heat affected zone of HSLA steel

Cited by 7 publications

References 10 publications

Influence of Heat Input on Microstructure and Mechanical Properties of Gas Tungsten Arc Welded HSLA S500MC Steel Joints

Influence of Heat Input on Microstructure and Mechanical Properties of Gas Tungsten Arc Welded HSLA S500MC Steel Joints

On mechanical and morphological investigations of tungsten inert gas welded SS 304 thin pipe joints

Microstructure evolution and properties of reheated coarse grain heat-affected zone of 900 MPa grade HSLA steel

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