METHOD FOR PRODUCING GUIDE RINGS FOR WATER TURBINES AND PUMP TURBINES.

摘要

A method of manufacturing a stay ring for a water turbine or pump turbine having an upper annular disc, a lower annular disc and a plurality of circumferentially equal-distantly spaced stay vanes extending between the upper and lower annular discs. The method includes forming openings in the upper and lower annular discs at locations where the stay vanes are to be positioned, locating the upper and the lower annular discs such that the openings in the upper and lower annular discs are put in vertical alignment, placing a plurality of molds each having therein a space of a shape conforming to that of the stay vane, such that the spaces in the molds are brought into communication with respective pairs of openings of the upper and the lower discs, and effecting an electroslag welding in the space in each mold through respective openings of the upper annular disc to fill the space with the welding metal, thereby to form the stay vanes and, at the same time, to connect the upper and lower annular discs through thus formed stay vanes.