High pressure vacuum electronic beam welding method for stator ring of air compressor of gas steam turine

Abstract

A high-voltage vacuum electronic beam welding technology for the static blade ring of air compressor in gas turbine features that a high-voltage vacuum electronic beam welder, the optimal welding parameters under 150 KV accelerating voltage, and the reasonable welding sequence are used to control the welding deformation and the quality of welded seam.

Description

technical field [0001] The invention belongs to the technical method of high-pressure vacuum electron beam welding (EBW for short) of the stator blade ring of the gas turbine compressor, and is suitable for welding deformation and weld seam quality problems existing in welding manufacturing due to structural reasons, especially the gas turbine compressor stator blade. The ring has the following characteristics: simple structure, large size, poor overall rigidity, high dimensional accuracy requirements, high parts cleanliness requirements, strict assembly clearance requirements, large number of welding seams, large welding volume, and large welds are prone to occur during the welding process Deformation and cracks. Background technique [0002] At present, there is no precedent in China for the welding production of gas turbine compressor vane rings. Foreign countries generally use medium-voltage vacuum electron beam welding, and keep technology secret in my country. Therefor...

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Problems solved by technology

[0002] At present, there is no precedent in China for the welding production of gas turbine compressor vane rings. Foreign countries generally use medium-voltage vacuum electron beam welding, and keep technology secret in my country. Therefore, there are the following difficulties in welding deformation and welding quality control: how to The blades are connected into a ring to minimize the deformation of the vane ring during the assembly process; welding shrinkage deformation in the diameter direction will inevitably occur during electron beam welding, but it is difficult to accurately control the amount of pre-shrinkage allowance and the welding sequence; because the product is The circular ring structure has strong radial rigidity and is prone to cracks during welding; it is difficult to determine the vacuum electron beam welding parameters for the stator blade ring material, especially the key parameters have a great influence on welding deformation and welding cracks; heat treatment after electron beam welding It is also prone to deformation, how to control it, etc.

Due to the lack of electron beam welding equipment and related technologies in the past, it is difficult to make a breakthrough in the welding and manufacturing technology of key components of gas turbines, which restricts the development of gas turbine manufacturing technology in China

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