Process for cavitation repair welding of through-flow turbine set runner chamber

Abstract

The invention discloses a process for cavitation repair welding of a through-flow turbine set runner chamber. The process is characterized by comprising a first step of determining a runner chamber cavitation part; a second step of planning the shape of part of the cavitation part needing polishing according to the cavitation part; a third step of performing polishing according to the planned shape, enabling the polishing depth to be consistent with the cavitation depth, and forming a polishing groove; a fourth step of enabling a stainless steel plate matched with the planned shape and the depth of the polished part to be embedded in the polishing groove, and enabling a plurality of sieve holes which cross through the stainless steel plate to be processed in the stainless steel plate; a fifth step of adopting an argon arc welding process, performing repair welding from the sieve holes in the middle of the stainless steel plate in the directions towards two sides, finally enabling the junction of the periphery of the stainless steel plate and the polishing groove to be welded, and enabling the polishing groove to be welded into the polishing groove. The process not only can guarantee that deformation of the runner chamber which is free of dismantling and lifting and undergoes repair welding is extremely small, but also enables the repaired runner chamber to completely meet safety in turbine set running, and the cavitation resistance of the runner chamber is improved to a large extent.

Description

[0001] technical field [0002] The invention relates to a welding repair process for the cavitation part of the runner chamber of the tubular unit. In the present invention, the runner chamber can be welded and repaired after the runner water is drained in the minor repair process without dismantling and lifting the runner chamber, and the runner chamber basically does not deform after the welding repair. Background technique [0003] The runner chamber of the water turbine is an important part that converts the water wheel into mechanical energy. During the process of water energy passing through the runner body and the runner chamber, some chemical and physical reactions occur on the runner blades and the inner wall of the runner. cavitation phenomenon. [0004] This kind of cavitation can directly damage the turbine runner blades and the runner chamber, and severe cavitation can easily cause the runner chamber to rupture. Structurally, the upper part of the runner ...

AI Technical Summary

Problems solved by technology

[0006] 1. When the cavitation part on the surface of the runner is melted by a high-current electric hammer, the high temperature generated by the high-current melting will affect a large range, and the high-temperature area is large, resulting in a large thermal deformation of the runner chamber

[0007] 2. In the blowing process of using electric 铇, because it cannot be precisely controlled, it is easy to cause more serious damage to the part that has not been subjected to cavitation, so that the welding amount becomes larger in the process of using electric welding, and the electric 铇 itself adopts high-current electric welding High temperature will be generated in the way, so that the workpiece to be welded will be deformed greatly

[0008] 3. Due to the thin wall of the runner chamber of the tubular unit, a high temperature is generated when the cavitation part on the surface of the runner is melted by a high-current electric hammer, and a high temperature is generated again when electric welding is used for repairing. Such multiple high-temperature processes make the The deformation of the runner chamber is more serious

[0009] 4. The surface of the runner is melted by high-current electric iron and the cavitation part after electric welding is repaired. Due to the large roughness and deformation of the welded surface, the amount of grinding in the correction and repair is very large, and the repair time is very long. , not only is it difficult to meet the satisfactory requirements, but also the economic loss caused

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