Effect of Heat Input on Evolution of Microstructure and Tensile Properties of Gas Tungsten Constricted Arc (GTCA) Welded Inconel 718 Alloy Sheets

2020 ◽  
Vol 9 (3) ◽  
pp. 369-392 ◽  
Author(s):  
Tushar Sonar ◽  
V. Balasubramanian ◽  
S. Malarvizhi ◽  
T. Venkateswaran ◽  
D. Sivakumar
Keyword(s):  
Tensile Properties ◽  
Heat Input ◽  
Inconel 718 ◽  
Inconel 718 Alloy ◽  
Gas Tungsten ◽  
Evolution Of Microstructure

scholarly journals Effect of Delta Current and Delta Current Frequency on tensile properties and microstructure of Gas Tungsten Constricted Arc (GTCA) welded Inconel 718 sheets

2019 ◽  
Vol 28 (1) ◽  
pp. 186-200 ◽  
Author(s):  
Tushar Sonar ◽  
Visvalingam Balasubramanian ◽  
Sudersanan Malarvizhi ◽  
Thiruvenkatam Venkateswaran ◽  
Dhenuvakonda Sivakumar
Keyword(s):  
Tensile Properties ◽  
Heat Input ◽  
Arc Welding ◽  
Inconel 718 ◽  
High Heat ◽  
Inconel 718 Alloy ◽  
Current Frequency ◽  
High Heat Input ◽  
Gtaw Process ◽  
Gas Tungsten

AbstractInconel 718 is a nickel-based superalloy which finds major applications in lightweight welded frames and other parts in gas turbine engines. This alloy is frequently joined by gas tungsten arc welding (GTAW) process for clean and precise welds. However, the weldability of Inconel 718 alloy is limited by the high heat input and slower cooling rate in GTAW process. It leads to the segregation of alloying elements and detrimental laves phase formation in weld metal which significantly reduces the tensile properties of the welded joints. To overcome this problem, a newly developed gas tungsten constricted arc welding (GTCAW) process is used for joining Inconel 718 alloy. The main effect of Delta Current (DC) and Delta Current Frequency (DCF) on the tensile properties and microstructure of GTCA welded 2 mm thick Inconel 718 alloy sheets was investigated. Superior tensile properties were exhibited at Delta Current of 50 A and Delta Current Frequency of 4 kHz due to the refinement in fusion zone. Delta Current and Delta Current Frequency showed deleterious effect at higher levels due to the high heat input.

scholarly journals Comprehensive Analysis of TIG Welded Inconel–718 Alloy for Different Heat Input Conditions

2018 ◽  
Vol 7 (3.6) ◽  
pp. 206
Author(s):  
P Jerold Jose ◽  
M Dev Anand
Keyword(s):  
Tensile Properties ◽  
Heat Input ◽  
Inconel 718 ◽  
Welding Process ◽  
Welding Current ◽  
Tig Welding ◽  
Welding Parameters ◽  
Inconel 718 Alloy ◽  
Weld Joints ◽  
Welding Heat Input

In this research, the effects of heat input on tensile properties and microstructure were investigated for super alloy Inconel-718 sheets weld by Tungsten Inert Gas (TIG) welding process. The tensile properties and microstructure of weld joints were evaluated. The experiment was conducted with six different combinations of welding parameters like welding current, voltage and welding speed, which were give in six different welding heat input combinations of welding parameters. The experimental results shows that the welding joints weld with low welding heat input was yield higher tensile properties. From the experimentation it was understand that the tensile properties increases when the welding heat input decrease. Drastic grain coarsening was evidenced when the heat input was increases. For the weld joints experimented in this research it was also observed that amount of laves phase was increased with increase in the welding heat input which is the major fact for noticeable variation in the ultimate tensile strength of the weld joints welded by TIG welding process with different welding heat input. 

Assessment of gas tungsten arc welding thermal cycles on Inconel 718 alloy

2019 ◽  
Vol 29 (3) ◽  
pp. 579-587 ◽  
Author(s):  
M. HERNÁNDEZ ◽  
R.R. AMBRIZ ◽  
R. CORTÉS ◽  
C.M. GÓMORA ◽  
G. PLASCENCIA ◽  
...  
Keyword(s):  
Arc Welding ◽  
Inconel 718 ◽  
Gas Tungsten Arc Welding ◽  
Thermal Cycles ◽  
Inconel 718 Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten
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