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Research Papers: Materials and Fabrication

Autogenous Tungsten Inert Gas and Gas Tungsten Arc With Filler Welding of Dissimilar P91 and P92 Steels

[+] Author and Article Information
Chandan Pandey

Department of Mechanical and
Industrial Engineering,
Indian Institute of Technology Roorkee,
Roorkee 247667, Uttarakhand, India
e-mails: mansfme@gmail.com;
kumarfme@gmail.com

Manas Mohan Mahapatra

School of Mechanical Sciences,
Indian Institute of Technology,
Bhubaneswar 751013, Odisha, India

Pradeep Kumar, N. Saini

Department of Mechanical and
Industrial Engineering,
Indian Institute of Technology Roorkee,
Roorkee 247667, Uttarakhand, India

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 12, 2017; final manuscript received January 12, 2018; published online February 22, 2018. Assoc. Editor: Steve J. Hensel.

J. Pressure Vessel Technol 140(2), 021407 (Feb 22, 2018) (7 pages) Paper No: PVT-17-1205; doi: 10.1115/1.4039127 History: Received October 12, 2017; Revised January 12, 2018

Creep strength ferritic/martensitic modified 9Cr-1Mo-V-Nb (P91) steel also designated as ASTM A335 and P92 steel are used for piping, cladding, ducts, wrappers, and the pressure vessel in Gen IV nuclear reactors. In the present investigation, a comparative study of the effect of autogenous tungsten inert gas welding (A-TIG) with double pass and multipass gas tungsten arc (GTA) welding with filler on microstructure evolution in the weld fusion zone and the mechanical properties of P91 and P92 steel welded joints was carried out. The microstructure evolution was studied in as-welded and postweld heat treatment (PWHT) condition. The study also focused on the evolution of δ-ferrite patches and their influence on the tensile properties of welded joints. PWHT was carried out at 760 °C with durations from 2 to 6 h. To study the effect of δ-ferrite evolution on mechanical properties, Charpy toughness, microhardness, and tensile tests were performed. The acceptable microstructure and mechanical properties were obtained after the 6 h of PWHT for A-TIG arc welding process while for GTA weld with filler wire, it was obtained after the 2 h of PWHT at 760 °C.

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References

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Figures

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Fig. 1

Typical micrographs of (a) P91 steel, (b) P92 steel, and (c) schematic evolution of grain boundaries, lath packets, blocks, and precipitates in P91 and P92 steel [18]

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Fig. 2

Macrograph of welded joints (a) AUTOGENIOUS TIG single pass, (b) GTAW with filler wire, and (c) autogenous TIG both side pass

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Fig. 3

Optical and SEM micrographs of weld fusion zone for different weld joints: (a) and (d) autogenous TIG single pass, (b) and (e) autogenous TIG both side pass, and (c) and (f) GTAW with filler wire

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Fig. 4

Optical and SEM micrographs of weld fusion zone after PWHT of 2 h for different weld joints: (a) and (d) autogenous TIG single pass, (b) and (e) autogenous TIG both side pass, and (c) and (f) GTAW with filler wire

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Fig. 5

Optical micrographs of weld fusion zone for different weld joints after 6 h of PWHT: (a) autogenous TIG single pass, (b) autogenous TIG both side pass, and (c) GTAW with filler wire

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Fig. 6

(a) Variation in peak hardness value and (b) variation in Charpy toughness

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Fig. 7

(a) Variation in UTS and (b) variation in YS

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Fig. 8

Fractographs of tensile tested specimen (a) autogenous TIG: as-welded, (b) autogenous TIG: PWHT-2 h, (c) autogenous TIG: PWHT-6 h, (d) GTAW: as-welded, and (e) GTAW: PWHT-2 h

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