88tpce009009 - ir.nctu.edu.tw pta welding on repairing land-based gas turbine components. high...
TRANSCRIPT
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PTA Repairing of Superalloy Turbine Blades
�����NSC 88-TPC-E-009-009
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��Plasma Transfer red Arc, PTA� !�
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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",
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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
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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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