The welding method repair and improving of low pressure steam turbine blades damaged by erosion
Conference
·
OSTI ID:82739
- Inst. de Investigaciones Electricas, Cuernavaca (Mexico). Div. Sistemas Mecanicos
The development of a welding technology for the butt welding of 6B cobalt-bearing Stellite solid bar-nose erosion shields to the leading edges of low pressure steam turbine moving blades is described. The welded solid bar-nose design was incorporated to improve erosion resistance and eliminate shield loss associated with the previously brazed shields. The repair technology and refurbishment of the L-O blades of a 300 MW steam turbine is fully described. The repair process included the blade geometry measurement by a 3D digital measuring machine, the design of a welded joint between the Stellite solid bar-nose and the blade leading edge, cutting off of worn blade leading edges, manufacture of the solid Stellite inserts, deposition of welds, stress relief, and blade polishing to recover the original profile. Finally quality control including natural frequency tests before and after the repair, and x-ray tests were applied. Also, the special jigs and tools for fabrication were designed.
- OSTI ID:
- 82739
- Report Number(s):
- CONF-941007--; ISBN 0-7918-1382-7
- Country of Publication:
- United States
- Language:
- English
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