1. bookVolume 26 (2019): Issue 4 (December 2019)
Journal Details
License
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Journal
First Published
20 Dec 2019
Publication timeframe
4 times per year
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English
access type Open Access

Analysis of Possibility of Repairing Welding of Selected of the Steam Turbines

Published Online: 24 Apr 2020
Page range: 265 - 271
Received: 03 Aug 2019
Accepted: 18 Dec 2019
Journal Details
License
Format
Journal
First Published
20 Dec 2019
Publication timeframe
4 times per year
Languages
English

The article presents the results of the study on the possibilities of repair by welding methods of exploitation steam turbine bodies. Two hull were investigation after a lifetime of more than 200.000 hours. Repair welding study were carried out on the L17HMF cast steel body in the immediately after exploitation condition, whereas the L21HMF cast steel body underwent a revitalization after the exploitation, and then the welding repair research were performed. On the material taken from the L17HMF cast steel hull, welding repairs were made by welding the previously cut four grooves measuring 200 mm 50 mm 50 mm, which were simulations of material defected. All samples were made in areas where maximum steam temperatures were operating. Welds were tested with destructive and non-destructive methods to determine their quality and define non-compliances detected. The L21HMF cast steel was subjected to a revitalization process, which consisted the hull in subjecting heat treatment in order to obtain favourable structural changes and improve the strength properties. Non-destructive examinations and hardness tests were carried out on the remedial weld, indicating the required quality of repairing remedial weld. Comparative study is aimed at demonstrating the main welding problems during the repair welding of exploitation steam turbine hulls.

Keywords

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