Repair welding measures of cracks on diaphragm of steam turbine lowpressure cylinder

Huadian Technology ›› 2012, Vol. 34 ›› Issue (1): 41-42.

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Repair welding measures of cracks on diaphragm of steam turbine lowpressure cylinder

YANG Zhanjun1, WANG Lipeng2

1.Gansu Electric Power Research Institute, Lanzhou 730050, China; 2.Lanzhou Xigu Cogeneration Power Company Limited, Lanzhou 730060, China

Received:1900-01-01 Revised:1900-01-01 Online:2012-01-25 Published:2012-01-25

Abstract

Abstract: During overhaul of steam turbine No.2 of a power plant, it was found that there is an about 35mm surface crack in sixth stage diaphragm of the lowpressure cylinder, which influences on unit safe operation directly. According to comprehensive analysis of the material of the diaphragm, it was decided to repair the defect by dig grinding and patch weld, and to adopt the cold welding method for the patch weld. The patch weld process, the preparing work, the preventive measures and the inspect method were introduced. The repaired diaphragm had operated for an overhaul period, and there was not new defect occurred in the patch welded position. This shows that the patch weld technology can ensure safe operation of the repaired diaphragm completely.

Key words: steam turbine, diaphragm, crack, grey cast iron, cold repair welding, safe operation

YANG Zhanjun;WANG Lipeng. Repair welding measures of cracks on diaphragm of steam turbine lowpressure cylinder[J]. Huadian Technology, 2012, 34(1): 41-42.

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Repair welding measures of cracks on diaphragm of steam turbine lowpressure cylinder

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