Weir Turbo Machinery

Job site
Didcot Power Station (Turbine)

Description of Job
Weld repair badly worn blades on Diaphragm

Description of Blade preperation
Grit blast Diaphragm blades, grind all damaged areas back to suitable base metal

Welding method

Using TIG method of welding

Material of casting

12% chrome

Material used for cold repair

AWS A5.14 ERNiCr-3 consumables
Scope of work
1/ Copper shoe is to be manufactured to fit the rear of the blade so no over penetration will incur when the welding takes place, due to the limited access at the rear of the blade for profiling.
2/ After shoe is fitted a slight gas pr-heat will be incorporated before the welding is started, reason of pr-heat is castings area is in access of 15mm thick as shown in pictures and need a small amount of pr-heat which will be measured with a temperature meter.
3/ Welding process will take place using a balanced method of welding to prevent cracking at the blade base and to keep the casting temperature low so no distortion is found.

After welding
Surface to be ground, NDT tested with reports

Paper work package
All welder certification
Company welding procedures
Materials certificate
Consumables certificate
NDT reports, Risk assessment, Method statement









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12% chrome...
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