In situ weld repair of blade tenon of steam turbine in a power plant Online publication date: Wed, 06-Feb-2008
by S.K. Albert, A.K. Bhaduri, C.R. Das, V. Ramasubbu, S. Ravi
International Journal of Nuclear Energy Science and Technology (IJNEST), Vol. 3, No. 4, 2007
Abstract: During one of the routine inspections in a nuclear power plant, it was found that a tenon of one of the third-stage blades of the Low-Pressure (LP) turbine had been worn/broken off the turbine blade, leaving only the remaining tenon riveted to the shroud piece. With only one of the two tenons remaining, the blade was at risk of getting freed from the shroud piece. Hence, it was necessary to repair the damaged tenon before the turbine was put back into service. This repair was carried out by rebuilding the damaged tenon in situ by weld build-up, using a procedure that would ensure that no welding occurred between the blade and the shroud. The rebuilt tenon is required to hold a minimum design tensile load of 3 tonnes. The blade that was repaired is made of a martensitic stainless steel and the repair was carried out by the Tungsten Inert Gas (TIG) welding process using ERNiCr-3 filler wires. This paper describes the welding procedures, mock-up studies and the inspection and testing conducted on both the actual job and the mock-up piece.
Online publication date: Wed, 06-Feb-2008
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nuclear Energy Science and Technology (IJNEST):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email email@example.com