The conventional constant current arc welding of Hastelloy X (Ni-Cr-Fe-Mo) leads to the solidification and liquation cracks in the weldment. The higher heat supplied in constant current weldment develops the secondary carbide precipitates. It promotes the development of hot cracks in the weldment. In this study, joining of Hastelloy X plates was carried out by constant current gas tungsten arc welding (GTAW) and pulsed current gas tungsten arc welding (PCGTAW) with C263 filler wire. The result discovered that no hot cracks were formed in the weldment. In constant current mode, Cr-rich and Mo-rich Cr23C6 (M23C6), Fe2MoC, Fe3Mo3C (M6C), and Cr2Ti precipitates were observed. Whereas, in pulsed current mode, Ni3(Al, Ti), Ni3Ti, Co3Ti, Cr2Ti precipitates are found due to the segregation of Co, Al, and Ti. No Cr-rich and Mo-rich carbide phases identified in pulsed current weldment due to rapid cooling rate and higher thermal gradient observed during solidification. The tensile results revealed that 8.23% increase in the ultimate tensile strength and a 29.62% increase in elongation of pulsed current mode welding compared to constant current welding. Further, the microhardness and impact toughness of PCGTAW is 3.32% and 5.45% higher than GTAW, respectively. In pulsed current welding, better mechanical properties were identified compared to constant current welding. The nonappearance of Cr and Mo-rich phases and refined microstructure in the weldment are the main reason for better strength.
Inconel alloy HX (UNS N06002).Technical data sheet. USA. Special Metal Corporation, pp.1–8.
2.
SathishkumarMNaijuCDManikandanM.Investigation of metallurgical and mechanical properties of hastelloy X by key-hole plasma arc welding process. SAE Technical Paper2019-28-0152,2019, pp.1–5.
3.
SathishkumarMManikandanM.Hot corrosion behaviour of continuous and pulsed current gas tungsten arc welded hastelloy X in different molten salts environment. Mater Res Express2019;
6: 126553.
4.
HanQMertensRMontero-SistiagaML, et al.
Laser powder bed fusion of hastelloy X: effects of hot isostatic pressing and the hot cracking mechanism. Mater Sci Eng A2018;
732: 228–239.
5.
BalKSDutta MajumdarJRoy ChoudhuryA.Optimization of melt zone area for electron beam welded hastelloy C-276 sheet and study of corrosion resistance of the optimized melt zone in 3.5 wt% NaCl aqueous solution. Arab J Sci Eng2019;
44: 1617–1630.
6.
SathishkumarMManikandanM.Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade alloy X. Proc IMechE, Part L: JMaterials: Design and Applications2020;
234: 637–653.
7.
SumeshARameshkumarKRajaA, et al.
Establishing correlation between current and voltage signatures of the arc and weld defects in GMAW process. Arab J Sci Eng2017;
42: 4649–4665.
8.
LiangTWangLLiuY, et al.
Microstructure and mechanical properties of laser welded joints of DZ125L and IN718 nickel base superalloys. Met Mater Int2018;
24: 604–615.
9.
SihotangRSung-SangPEung-RyulB.Effects of heat input on microstructure of tungsten inert gas welding used hastelloy X. Mater Res Innov2014;
18: S2-1074–S2-1080.
10.
PakniatMGhainiFMTorkamanyMJ.Hot cracking in laser welding of hastelloy X with pulsed Nd:YAG and continuous fiber lasers. Mater Des2016;
106: 177–183.
11.
BaekERParkSSSihotangRS, et al. Heat treatment of the degraded hastelloy-X for high cycle fatigue properties. In:Proceedings of the 9th international conference on fracture and the strength of solids, Jeju Island, Republic of Korea, 2013, p.91.
12.
ZhaoJCLarsenMRavikumarV.Phase precipitation and time-temperature-transformation diagram of hastelloy X. Mater Sci Eng A2000;
293: 112–119.
13.
TomusDRometschPAHeilmaierM, et al.
Effect of minor alloying elements on crack-formation characteristics of Hastelloy-X manufactured by selective laser melting. Addit Manuf2017;
16: 65–72.
14.
ManikandanSGKSivakumarDPrasad RaoK, et al.
Effect of weld cooling rate on laves phase formation in inconel 718 fusion zone. J Mater Process Technol2014;
214: 358–364.
15.
SubramaniPManikandanM.Development of welding technique to suppress the microsegregation in the aerospace grade alloy 80A by conventional current pulsing technique. J Manuf Process2018;
34: 579–592.
16.
ArulmuruganBManikandanM.Development of welding technology for improving the metallurgical and mechanical properties of 21st century nickel based superalloy 686. Mater Sci Eng A2017;
691: 126–140.
17.
ManikandanMArivazhaganNNageswara RaoM, et al.
Microstructure and mechanical properties of alloy C-276 weldments fabricated by continuous and pulsed current gas tungsten arc welding techniques. J Manuf Process2014;
16: 563–572.
18.
SubramaniPManikandanM.Development of gas tungsten arc welding using current pulsing technique to preclude chromium carbide precipitation in aerospace-grade alloy 80A. Int J Miner Metall Mater2019;
26: 210–221.
19.
SathishkumarMManikandanM.Preclusion of carbide precipitates in the hastelloy X weldment using the current pulsing technique. J Manuf Process2019;
45: 9–21.
20.
PadmanabanGBalasubramanianV.Influences of pulsed current parameters on mechanical and metallurgical properties of gas tungsten arc welded AZ31B magnesium alloys. Met Mater Int2011;
17: 831–839.
21.
KangazianJShamanianM.Effect of pulsed current on the microstructure, mechanical properties and corrosion behavior of Ni-based alloy/super duplex stainless steel dissimilar welds. Trans Indian Inst Met2019;
72: 2403–2414.
22.
JulaMDehmolaeiRAlavi ZareeSR.The comparative evaluation of AISI 316/A387-Gr.91 steels dissimilar weld metal produced by CCGTAW and PCGTAW processes. J Manuf Process2018;
36: 272–280.
23.
LouSLeeSBNamD, et al.
Microstructures and mechanical properties of bonding layers between low carbon steel and alloy 625 processed by gas tungsten arc welding. Met Mater Int2017;
23: 1168–1175.
MukherjeeMSahaSPalTK, et al.
Influence of modes of metal transfer on grain structure and direction of grain growth in low nickel austenitic stainless steel weld metals. Mater Charact2015;
102: 9–18.
26.
LiuJWRaoZHLiaoSM, et al.
Numerical investigation of weld pool behaviors and ripple formation for a moving GTA welding under pulsed currents. Int J Heat Mass Transf2015;
91: 990–1000.
27.
TomusDTianYRometschPA, et al.
Influence of post heat treatments on anisotropy of mechanical behaviour and microstructure of Hastelloy-X parts produced by selective laser melting. Mater Sci Eng A2016;
667: 42–53.
28.
ZhouKCMaLLiZY.Oxidation behaviors of electrodeposited nickel-cobalt coatings in air at 960°C. Trans Nonferrous Met Soc China (English Ed)2011;
21: 1052–1060.
29.
BatoolSKhanMJafferySHI, et al.
Analysis of weld characteristics of micro-plasma arc welding and tungsten inert gas welding of thin stainless steel (304L) sheet. Proc IMechE, Part L: J Materials: Design and Applications2016;
230: 1005–1017.
30.
LiLYangMQiB, et al.
Study of high frequency pulsed arc on molten Pool thermal properties of Ti-6Al-4V. J Manuf Process2019;
38: 308–312.
31.
WuKDingNYinT, et al.
Effects of single and double pulses on microstructure and mechanical properties of weld joints during high-power double-wire GMAW. J Manuf Process2018;
35: 728–734.
32.
FarahaniEShamanianMAshrafizadehF.A comparative study on direct and pulsed current gas tungsten arc welding of alloy 617. AMAE Int J Manuf Mater Sci2012;
2: 1–6.
33.
SathishkumarMManikandanM.Development of pulsed current arc welding to preclude carbide precipitates in hastelloy X weldment using ERNiCr-3. J Mater Eng Perform2020;
29: 5395–5408.
34.
Matthew DonachieJStephen DonachieJ.Superalloys: a technical guide. 2nd ed.
USA:
ASM International, 2002. pp.165–172.
35.
ZhangZZhouFLaverniaEJ, et al.
On the analysis of grain size in bulk nanocrystalline materials via X-Ray diffraction. Metall Mater Trans A 2003; 34:1349–55.
36.
ZhouSChaiDYuJ, et al.
Microstructure characteristic and mechanical property of pulsed laser lap-welded nickel-based superalloy and stainless steel. J Manuf Process2017;
25: 220–226.
37.
JunaidMKhanFNMirzaMR, et al.
Microstructure, mechanical properties and residual stress distribution in pulsed tungsten inert gas welding of Ti–5Al–2.5Sn alloy. Proc IMechE, Part L: J Materials: Design and Applications2019;
233: 2030–2044.
38.
VasuKChelladuraiHRamaswamyA, et al.
Effect of fusion welding processes on tensile properties of armor grade, high thickness, non-heat treatable aluminium alloy joints. Def Technol2019;
15: 353–362.
39.
Madhusudhan ReddyGSrinivasa RaoK.Microstructure and corrosion behaviour of gas tungsten arc welds of maraging steel. Def Technol2015;
11: 48–55.
40.
MurthyCVSGopala KrishnaAReddyGM.Microstructure and mechanical properties of similar and dissimilar metal gas tungsten constricted arc welds: Maraging steel to 13-8 Mo stainless steel. Def Technol2019;
15: 111–121.
41.
MastanaiahPSharmaAReddyGM.Process parameters-weld bead geometry interactions and their influence on mechanical properties: a case of dissimilar aluminium alloy electron beam welds. Def Technol2018;
14: 137–150.
42.
BalasubramanianMJayabalanVBalasubramanianV.Effect of microstructure on impact toughness of pulsed current GTA welded α-β titanium alloy. Mater Lett2008;
62: 1102–1106.
43.
SharmaSTaiwadeRVVashishthaH, et al.
Consumable selection for pulsed current gas tungsten arc welded bimetallic joints between super C-276 alloy and Ti-stabilized grade 321. J Manuf Process2018;
32: 32–47.
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