Development of pulsed current gas tungsten arc welding technique for dissimilar joints of marine grade alloys

2016 ◽  
Vol 21 ◽  
pp. 201-213 ◽  
Author(s):  
K. Devendranath Ramkumar ◽  
Shah Vitesh Naren ◽  
Venkata Rama Karthik Paga ◽  
Ambuj Tiwari ◽  
N. Arivazhagan
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Pulsed Current ◽  
Dissimilar Joints ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Welding Technique

Influence of pulsed current arc welding to preclude the topological phases in the aerospace grade Alloy X

2020 ◽  
Vol 234 (4) ◽  
pp. 637-653 ◽  
Author(s):  
M Sathishkumar ◽  
M Manikandan
Keyword(s):  
Tensile Strength ◽  
Arc Welding ◽  
Optical Microscope ◽  
Gas Tungsten Arc Welding ◽  
Pulsed Current ◽  
Secondary Phases ◽  
Gas Tungsten Arc ◽  
Topologically Close Packed ◽  
Gas Tungsten ◽  
Welding Technique

Alloy X is prone to liquation and solidification cracks in the weldments, because of the development of topologically close-packed precipitates such as σ, P, M6C, and M23C6 carbides during arc welding methods. The present work examines the possibility of alleviating the segregation of Cr and Mo content to eliminate the development of topologically close-packed phases using a conventional arc welding technique. The welding of Alloy X has been achieved with ERNiCrMo-2 filler material by gas tungsten arc welding and pulsed current gas tungsten arc welding technique. The optical microscope shows the refined microstructure in pulsed current gas tungsten arc with respect to gas tungsten arc welding. The Mo-rich segregation was identified in gas tungsten arc weldment, and the same was absent in pulsed current gas tungsten arc. These segregations of Mo-rich content encourage the development of M3C and M6C secondary precipitates in gas tungsten arc welding. Pulsed current gas tungsten arc welding shows the existence of NiCrCoMo precipitate. The present work confirmed the absence of P, σ, and M23C6 in both the weldments of Alloy X. The ultimate tensile strength, microhardness, and impact strength of pulsed current gas tungsten arc welding are increased by 3.39, 9.17, and 21.62%, respectively, with gas tungsten arc welding. The observed Mo-rich M3C and M6C secondary phases in the gas tungsten arc welding affect the tensile strength of the weldments.

Heat Transfer Modelling and Investigation of the Effect of Pulse Frequency and Current in Pulsed Current Gas Tungsten Arc Welding

2014 ◽  
Vol 592-594 ◽  
pp. 395-399
Author(s):  
A. Prabakaran ◽  
R. Sellamuthu ◽  
Sanjivi Arul
Keyword(s):  
Heat Transfer ◽  
Weld Pool ◽  
Arc Welding ◽  
Gta Welding ◽  
Gas Tungsten Arc Welding ◽  
Transfer Model ◽  
Pulsed Current ◽  
Current Frequency ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Gas Tungsten Arc Welding (GTAW) involves several process parameters. In Pulsed Current GTAW frequency of pulse and pulse to time ratio differentiates the characteristics of weld pool geometry of from GTAW. In the present work a simple heat transfer model for Pulsed Current GTA welding was developed and the weld pool dimensions were experimentally verified with AISI 1020 steel. Relationship between speed and pulsed current frequency on weld pool dimension was studied. Weld pool dimension of pulsed and non-pulsed GTAW is studied.

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