CONSTRUCTION METHOD FOR ON-SITE WELDING REPAIR OF HYDRAULIC MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a construction method for an on-site welding repair of a hydraulic machine capable of reducing residual stress and recovering ductility, hardness and impulse value of the welding section to the original characteristics of the materials since no repair machine processing of the whole machine is required and no specially large-scaled heat treatment furnace is required without deforming the whole machine as in the case that the whole machine is entered into a heat treatment furnace for the welding repair work when cavitation damage occurs due to wear and cavitation generated to the hydraulic machine after the hydraulic machine is installed on-site and operated.

SOLUTION: In case that cavitation damage occurs after on-site installation of the hydraulic machine is completed and operated, the hydraulic machine is on-site welding repaired and after welding, the welded section is heat-treated at such temperatures that reach annealing temperatures proper to the materials.

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