Electron beam welding process for heavy duty gas turbine compressor rotor and turbine assembly

Abstract

The invention discloses an electron beam welding process for a heavy duty gas turbine compressor rotor and a turbine assembly, which is characterized by an empirical calculating formula of a margin ofthe electron beam welding process for the heavy duty gas turbine compressor rotor and the turbine assembly, namely eta=(0.4-0.6)*S*(Wr<2> / Wf*Wm)*10<-n). a, when a big and thick piece made of a 0Cr11Ni2MoNbV material is subjected to electron beam welding, an alloy added to prevent crack defects from being generated is a GH536 plate of which the thickness is between 1.0 and 2.0mm; and b, an empirical calculating formula of a specification of the added GH536 alloy plate is as follows: delta=0.1(S1-B1). The electron beam welding process has the advantages that: the quality of weld seams is qualified; various technical indexes such as dimensional accuracy and the like meet the requirements; particularly, one-time gang welding of 5 to 10-level drums of an air compressor finishes six weld seams,which marks that the independent research and development of a heavy duty gas turbine in China breaks through key manufacturing technology and a core special process for a large gas turbine is mastered; and the technology fills up the domestic blank and achieves the international advanced level.

Description

technical field [0001] The invention relates to the field of welding, and in particular provides an electron beam welding process for a rotor of a heavy-duty gas turbine compressor and a turbine assembly. Background technique [0002] The heavy-duty gas turbine is a national 863 plan project, and it is the first heavy-duty gas turbine independently developed in China. Its 1-17 compressor rotors and turbine components have the following characteristics: large forgings (the maximum diameter of the compressor component is Φ1901mm, and the turbine component The maximum diameter is Φ2101mm), the thickness to be welded is large (the maximum thickness to be welded is 80mm), the weight is large (the maximum assembly weight in the compressor is 5 tons), the grain of the material to be welded is coarse (free forging process), and the number of welds is large (A total of 22 pieces on the compressor, 5 pieces on the turbine assembly), new materials to be welded (the material of the comp...

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Problems solved by technology

In addition, the drums of stages 5-10 and stages 11-17 in the compressor assembly require one-time combined welding, and all single disks are processed to dimensional accuracy. Electron beam welding must ensure both structural dimensional accuracy and various Technical index requirements, there is no research and development foundation in China, and no institution has carried out similar and related basic tests and research work on welding process, material weldability, welding deformation and shortening process margin

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