Observation and analysis of metal transfer phenomena for high-current super-TIG welding process

Jun, Jae Ho; Park, Jung Hyun; Cheepu, Muralimohan; Cho, Sang Myung

doi:10.1080/13621718.2019.1637172

Cited by 19 publications

(6 citation statements)

References 19 publications

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“…Among them, pulsed current GTAW showed refined grain structure, high toughness, and joint strength. 21,22 Later, the studies identified that reducing the welding area by a narrow gap reduces the multi-pass heat input to the welded joint. The narrow gap welding using GTAW welding showed significant improvements in the prevention of cracking and the yield strength to tensile strength ratio.…”

Section: Introductionmentioning

confidence: 99%

Investigation of microstructure, mechanical, and corrosion properties of Inconel 617 joints welded by laser–MIG hybrid welding

Kumar

Balasubramanian

Prabhakar

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The demand for Nickel-based superalloy of Inconel 617 material is increasing for manufacturing hot section components of gas turbines, chemical, and nuclear power plants. It has excellent corrosion resistance in high-temperature environments. In the present study, laser–MIG hybrid welding consisting of a 3.5 kW CO2 laser in combination with a MIG welding system was utilized to weld 10 mm thick Inconel 617 plates with the wire feed rates (WFR) of 10 and 11 m/min in a single pass to analyze the welds microstructure, mechanical, and corrosion properties. The results revealed that the microstructure of the weld zone is composed of cellular crystals with dendrites and equiaxed sub-grains. Electron backscattered diffraction (EBSD) studies revealed coarse columnar dendrites and equiaxed grains at the center of weld joints with the same crystallographic orientation across the fusion boundary. The XRD analysis revealed the dominant gamma and gamma prime (γ/γ′) [(Ni/Ni3(AlTi))] phases along with the presence of minor carbide peaks such as Ti (C, N), M23C6, Cr (C, N), and M6C. The BM has a lower hardness (232 HV) and higher impact energy (236 J) than the weld joints. Similarly, the increase in WFR results in a decrease in microhardness (268–256 HV) values and an increase in impact energy (199–212 J). The weld joints exhibit good bend ductility without any cracks. The potentiodynamic polarization results revealed a lower corrosion rate of 0.212 mpy for the base metal than for the weld joints. The increase of WFR increased the weld metal corrosion rate from 0.342 to 0.427 mpy due to an increase in heat input (0.516–0.615 kJ/mm) and solidification time, which caused the coarsening of the grains resulting in lower grain boundary density and anode reaction to accelerate, which deteriorated the corrosion resistance of the welds.

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Section: Introductionmentioning

confidence: 99%

Investigation of microstructure, mechanical, and corrosion properties of Inconel 617 joints welded by laser–MIG hybrid welding

Kumar

Balasubramanian

Prabhakar

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…One of the solutions to these problems is the automation of the welding process and the possibility of using welding speeds much higher than those in the manual process. As a result of automation, an increase in the repeatability of welding production is observed, as well as an increase in efficiency with a reduced amount of heat input into the material [14][15][16][17][18][19][20]. The use of automated welding processes also makes it possible to change the method of preparing the edges for welding, as in manual welding the groove (bevel) must be wide so that the welder can reach the arc and observe the weld pool, and for the automated process it is unnecessary.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Microstructure and Mechanical Properties of the Butt-Welded Joints of Spiral Pipes Made of L485ME (X70) Steel

Tuz

2023

Materials

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The expansion of the gas pipeline network makes it necessary, on the one hand, to meet the requirements of standards regarding the materials used, but on the other hand, it is necessary to weld them. In the case of natural gas as a fuel, the welding process is widely used, but in the case of replacing natural gas with a mixture of this gas and hydrogen, the requirements regarding the quality of the process must be significantly increased or the process must be completely changed. This article presents the results of testing welded joints for a newly developed welding technology for the transmission of a hydrogen mixture. Material tests were carried out on a butt-circumferential-welded joint made between two spiral pipes with an outer diameter of 711 mm and wall thickness of 11 mm in the X70 grade. The developed welding technology is distinguished by a change in the beveling method of the edges, which allows the heat input to the material to be limited. The technology was developed for use in natural on-shore and off-shore gas pipelines with the addition of hydrogen. As a result, additional requirements in terms of joint plasticity had to be met during welding. The test results obtained indicate that the joints are characterized by high strength (more than 581 MPa), higher than that of the base material (fracture in the base material) and good impact strength at reduced temperature (more than 129 J). In transverse corrosion, a hardness below 250 HV and a favorable structure of ferrite with different morphologies were obtained.

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“…1) The main limitation in TIG welding is the maximum depth of penetration in a single pass which leads to joining thick sections with multi passes. 3) In TIG, welding fluxes are not used because of the formation of slag, causing corrosion on weld metals. Further welding current is another factor affecting the weld joint.…”

Section: Introductionmentioning

confidence: 99%

Interrelationship Modeling Among Weld Strength Improvement by Parametric Approach in TIG Welding using DEMATEL Software

Tiwadi,

Brij Mohan Sharma,

Saraswat

et al. 2023

Evergreen

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Tungsten Inert Gas (TIG) welding is an important and versatile welding technique used across the globe to join ferrous materials such as mild steel and nonferrous materials like stainless steel, aluminum alloys, and copper alloys. TIG welding technique has various parameters like current type, depth of penetration, length of the arc, welding speed, inert gas flow rate, and much more. These parameters are essential in obtaining a weld with desired strength and properties. By controlling these parameters, a sound and strong weld joint can be obtained. In this paper, five important parameters are selected, and a cause and effect diagram is plotted using DEMATEL (Decision Making Trail and Evaluation Laboratory) software. Then the degree of importance is calculated to find which of the five parameters are causes and which of the given parameters are effects. Further, a sensitivity test is done to check whether the results obtained from the used approach are feasible or not.

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Observation and analysis of metal transfer phenomena for high-current super-TIG welding process

Cited by 19 publications

References 19 publications

Investigation of microstructure, mechanical, and corrosion properties of Inconel 617 joints welded by laser–MIG hybrid welding

Investigation of microstructure, mechanical, and corrosion properties of Inconel 617 joints welded by laser–MIG hybrid welding

Evaluation of the Microstructure and Mechanical Properties of the Butt-Welded Joints of Spiral Pipes Made of L485ME (X70) Steel

Interrelationship Modeling Among Weld Strength Improvement by Parametric Approach in TIG Welding using DEMATEL Software

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