Method for guaranteeing electron beam welding coaxiality of large-diameter drum of gas turbine

Abstract

A method for guaranteeing the electron beam welding coaxiality of a large-diameter drum of a gas turbine comprises the steps that: a welding clamp base plate and a shaft are assembled into a combined body, the combined body is placed on a plane rotary table, the combined body is aligned on the plane rotary table, and the combined body is fixed to the plane rotary table; a certain-stage disc of the drum is placed on the welding clamp base plate, the certain-stage disc of the drum is aligned on the welding clamp base plate, and the certain-stage disc of the drum is fixed to the welding clamp base plate; the next-stage disc of the certain-stage disc is placed on the fixed certain-stage disc, and the next-stage disc is aligned on the certain-stage disc; spot welding, positioning and fixing are carried out on a welding seam of the next-stage disc of the certain-stage disc through argon arc welding; according to the assembling, alignment and spot welding steps of the certain-stage disc and the next-stage disc, assembling, alignment and spot welding of other stages of discs are completed; and a top cover of the welding clamp is placed on the disc located on the topmost layer of the drum, the top cover is fixed to the combined body, and at the moment, all the stages of discs of the drum are centered before electron beam welding.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing of gas turbine drum parts, and in particular relates to a method for ensuring the coaxiality of electron beam welding of a gas turbine large-diameter drum. Background technique [0002] At present, the following two methods are mainly used to ensure the coaxiality of the electron beam welding of the large-diameter drum of the gas turbine: [0003] Method ①: Guarantee the coaxiality through the bottom-locked butt joint of the drum with interference fit. [0004] However, when the method ① is adopted, hot fitting is required during the assembly of the drum, so the assembly conditions are harsh and the assembly is likely to be inappropriate. At the same time, the interference fit is not conducive to the discharge of metal vapor during welding, and it is easy to cause welding defects. Lead to high parts scrap rate. [0005] Method ②: through the simple adjustment of the butt joint gap ...

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Problems solved by technology

[0006]However, when adopting method ②, the centering accuracy before welding is insufficient, and the butt joint gap of the bottom lock is not uniform and stable during welding, which may cause burn-through due to excessive local gap. Moreover, the accuracy of welding coaxiality is not high, and there are problems such as low qualified rate of one-time submission of parts and frequent reprocessing, resulting in unstable product quality, increasing production cycle and increasing production cost

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