Method and device for welding water-wheel socket ring

Abstract

The invention provides a method and a device for welding a water-wheel socket ring. The method includes that for generation of welding tracks, establishing a three-dimensional model of a water-wheel socket ring according to size, assembly and positional relation of each part, taking feature points on an intersection line of fixed guide vanes and upper and lower annular plates every other 50-100mm, and matching all control points to obtain the continuous welding tracks of an individual fixed guide vane; integrally translating the welding tracks of the individual fixed guide vanes on the three-dimensional model of the water-wheel socket ring to perform local modification, and continuously generating the welding tracks of the whole water-wheel socket ring; assembling the water-wheel socket ring; pre-heating prior to welding; using a robot welding gun for automatic welding. By the method, a robot welding process is continuous and stable, welding quality stability is remarkably improved, and welding efficiency is improved by 3-4 times as compared to that of manual welding; labor intensity and security risk of a welding operator are lowered; welding lines generated are regular in shape and attractive, and the qualified rate of flaw detection is higher than that of the same type by manual welding.

Description

technical field [0001] The invention relates to the technical field of manufacturing a seat ring of a hydroelectric generator, in particular to a robot automatic welding method and a device for a seat ring of a water turbine. Background technique [0002] The seat ring is an important buried part of the hydro-generator, which will bear the weight of the unit, the weight of the concrete, the axial water thrust of the runner and the internal water pressure of the volute, and should have sufficient strength, rigidity and stability. The process places extremely high demands. The seat ring is mainly welded by an upper ring plate, a lower ring plate and a certain number of fixed guide vanes, and each fixed guide vane is connected to the upper and lower ring plates by welding. The structure of the seat ring is relatively complex, the welding is difficult, and the quality of the weld seam is high, which puts forward high requirements for welding technology. [0003] Judging from t...

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Problems solved by technology

[0005] (2) High welding preheating temperature

In a small semi-enclosed space, high temperature greatly affects the operator's safety and welding level;

[0006] (3) Seat ring components are all thick plates, with a large amount of welding filling and a long duration

However, the submerged arc welding process in this scheme is only used for the tailor welding of individual parts of the upper and lower ring plates, and is not suitable for the connection weld between the fixed guide vane and the upper and lower ring plates after the seat ring structure is assembled, so it is not suitable The above-mentioned difficulty in seat ring assembly and welding is not solved

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