Effect of Welding Parameters on TIG Welding of Inconel 718 to AISI 4140 Steel

Anuradha, M.; Das, Vemulapalli Chittaranjan; Susila, P.; Cheepu, Muralimohan; Venkateswarlu, D.

doi:10.1007/s12666-020-01926-8

Cited by 16 publications

(5 citation statements)

References 17 publications

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“…At the same time, Inconel steel (IN718) has excellent corrosion resistance and heat resistance, and its strength hardly deteriorates even at high temperatures. [16][17][18] It is used in electric heaters parts and exhaust valves of aircraft, due to its non-oxidizing property even above 900 C. Friction welding of dissimilar materials using structural steel and cast alloy is hardly performed. Particularly, parts that are exposed to extreme heat, such as gas turbine burners, are made of expensive Inconel castings, and other parts are made of structural alloy steel.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the mechanical properties of Inconel 718 to SCM 440 dissimilar friction welding through real-time monitoring of the acoustic emission system

Kong

Cheepu²,

Lee

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Friction welding was chosen for its versatility in the joining of dissimilar materials with high quality. The aim of this study is to determine the optimal welding conditions for attaining quality joints by using online monitoring of acoustic emission system signals. During friction welding, the formation of cracks, defects, or any abnormalities in the joining process which have a detrimental effect on the joints quality was identified. The most widely used materials in the aerospace industry—Inconel 718 and molybdenum steel—were joined by friction welding. The precision of the joints, internal defects, and quality are major concerns for aerospace parts. The results of the present research determined the optimal welding conditions for high tensile strength by nondestructively inducing acoustic emission signals. During friction time and upset time periods, the typical waveforms and frequency spectrum of the acoustic emission signals were recorded, and their energy level, average frequency, cumulative count, and amplitude were analyzed. Both cumulative count and amplitude were found to be useful parameters for deriving the optimal welding conditions. In the initial stage of friction welding, a very high voltage of continuous form was generated with frequency characteristics of 0.44 MHz and 0.54 MHz. The signals generated during the upset stage had a low voltage, but a very high frequency of 1.56 MHz and 1.74 MHz with a burst-type signal. The amplitude of the signal generated for the optimally welded joints was about 100 dB at the friction time and about 45 dB at the upset time.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the mechanical properties of Inconel 718 to SCM 440 dissimilar friction welding through real-time monitoring of the acoustic emission system

Kong

Cheepu²,

Lee

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Welding parameters were mainly determined based on our previous study [21] and Anuradha et al [22]. In present work, the current usage under 30 A and upper 80 A caused undesired results for 1 mm thick Inconel 718 sheets as shown in Fig.…”

Section: Experimental Studiesmentioning

confidence: 86%

“…It was used direct current electrode negative (DCEN) and 220 Volt energy. Alternative current (AC) and direct current electrode positive (DCEP) are rarely preferred for Inconel 718 welding on the literature [22][23][24]. DCEN provided better weldability compared with AC and DCEP.…”

Section: Experimental Studiesmentioning

confidence: 99%

The Effect of TIG Welding Parameters and Automatization for Non-Heat Treated Inconel 718 Sheets

2021

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Inconel 718 alloy is widely used in applications that require advanced strength properties especially at high temperature conditions. Combust room walls, exhaust parts, jet tribune blades and gas tribune equipment are the most known using areas. This alloy can be welded with various fusion welding methods, but TIG (Tungsten Inert Gas) welding is preferred since, it provides simply application, mobility and low cost. This study was aimed to clarify that how adjusting the welding parameters and welding automatically can help to achieve promising mechanical properties before heat treatments. The welding experiments were conducted on three different welding current values and attention was paid to provide full penetration for each condition. The results showed that the highest welding current value which did not cause welding defects lead to decrease heat input due to the high transverse speed usage. Moreover, by automatically welding, the heat input was decreased to a minimum level that provided excellent tensile strength and elongation properties. Dendrites turned to cellular from colon. Hazardous zones, such as HAZ and PMZ, narrowed down. The Laves phase ratio and grain size also decreased. Microhardness results confirmed these microstructure observations. The crack observations after tensile tests showed that failures were near HAZ in high-heat input conditions. However, failures were observed in FZ for low-heat input conditions. Additionally, ductile fracture and fracture similar to cleavage mechanisms were observed together due to adjusting the parameters and automatization.

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“…Nevertheless, in some studies the formation of such a structure was avoided by rapid cooling from the liquid state [17][18][19]23]. To overcome this problem, an additional layer between vanadium and iron layers, for example, copper was used [15] or nickel, which is well welded with most iron-based alloys [27][28][29][30][31][32][33]. However, a layer of pure copper signi cantly impairs corrosion resistance and reduces the whole structure strength due to the low strength properties of copper [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Combined titanium-steel structures formation by directed energy deposition using vanadium and nickel interlayers

Terentyev,

Borodavkina,

Kozyrev

et al. 2024

Preprint

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The possibility of obtaining a combined titanium-steel construction by directed energy deposition using vanadium or vanadium/nickel interlayers. Vanadium wire VnPr-1, nickel wire NP1 grade and welding wires Sv-08G2S, 316L, MSG NiFe-1 grades were used for deposition on the end of the titanium plate VT1-0. The use of vanadium as an interlayer deposited on titanium makes it possible to provide a joining with a stable structure, steady hardness distribution and acceptable manufacturability. The content of dissolved titanium in the vanadium layer negatively influence on the subsequent deposition of steel, nickel or iron-nickel alloy. Therefore, the titanium content was reduced to the level of ˂0.5% by deposition at least 4 vanadium beads. The results of tensile tests showed that all specimens failed in the elastic section mostly along the interlayers between vanadium and subsequent layers of low-carbon steel, nickel and iron-nickel alloys deposited on it. The only specimen was destroyed along the titanium-vanadium interlayer probably due to brittle ω–phase formation.

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Effect of Welding Parameters on TIG Welding of Inconel 718 to AISI 4140 Steel

Cited by 16 publications

References 17 publications

Evaluation of the mechanical properties of Inconel 718 to SCM 440 dissimilar friction welding through real-time monitoring of the acoustic emission system

Evaluation of the mechanical properties of Inconel 718 to SCM 440 dissimilar friction welding through real-time monitoring of the acoustic emission system

The Effect of TIG Welding Parameters and Automatization for Non-Heat Treated Inconel 718 Sheets

Combined titanium-steel structures formation by directed energy deposition using vanadium and nickel interlayers

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