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PTA Repairing of Superalloy Turbine Blades

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Abstract

This research was to investigate the

repairing weldability of Nikel-base superalloy

IN-738LC. The objective of this investigation

was to study the ef fect of Plasma Transfer red

Arc�PTA�welding on repairing land-based

gas turbine components. High temperature

tensile test and high temperature cyclic

oxidation test were carried out to determine

its mechanical strength and the ability of

antioxidation. With weld pool shape analysis,

microhardness measuring, metallography and

SEM examination, its microstructure and the

type of failure surface were determined.

From experimental results, the best PTA

parameters are 115A current, 240mm/min

weld speed and with prewelded soluted

treatment. It had also better per formance in

high temperature range. The result also shows

that, with plasma tmsferred arc welding, the

PTA repaired specimens can reach 96%

tensile strength of IN-738LC parent metal.

Even the weakest one can reach 89%. The

ability of antioxidation of the PTA repaired

one is not worser than IN-738LC parent metal.

KeywordsNikel-based superalloy, Plasma

Transferred Arc, Land-based gas turbine

components, cyclic oxidation

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1.R. Castillo, A.K. Koul and E.H. Toscano,

Journal o f Engineering for Gas Turbines and

Power, January l987, 99-106.

2.J.R. Kattus, "NONFERROUS ALLOYS",

March l984, Code 4217, 1-25.

3.D. Stellite, "PTA TRAINING MANUAL",

1992.

4.M.J. Donachie, JR., "SuperalloysìSource

Book", ASM, 1984.

5.B. Jahnke, Welding Journal, November l982,

343s-347s.

6.H.E. Boyer and T.L. Gall, "Metals

Handbook", 1985.

7.E. Craig, Welding Journal, February 1988,

19-25.

8.J.F. Lancaster, "Metallurgy of Welding",

1993.

9.P. Burgardt and C.R. Heiple, Welding

Journal, June 1986, l50s-155s.

10.Kou Sindo, "Welding Metallurgy", 1987.

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