Split face laser seal coating process in gas turbine cylinder

A technology for sealing coatings and gas turbines, which is applied to metal material coating processes, coatings, etc., to achieve the effects of improving cost savings, small thermal deformation, and simple repair process operations

Active Publication Date: 2017-05-10
上海闸电燃气轮机发电有限公司
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example 1

[0022] Repairing process of facet air leakage in the turbine cylinder of a gas turbine. Due to the long-term use of the middle parting surface of the cylinder body, the cylinder body is deformed, and the middle parting surface is not tightly combined, and the gap value can reach a maximum of 1mm and a minimum of 0.2mm.

[0023] The repair steps are as follows.

[0024] 1) Inspection and preparation of gas turbine cylinder block before laser cladding.

[0025] 2) Laser cladding: a total of three parallel sealing lines are cladding, each sealing line has a width of 2mm and a height of 1mm, forming multi-level parallel soft metal sealing belts, so that the laser cladding layer can be deformed after installation and extrusion. An airbag-type sealing cavity is formed, thereby playing the role of step-by-step sealing.

[0026] The process parameters are: power: 1200W, spot diameter: 2mm, scanning speed: 75mm / min, powder thickness: 0.8mm.

[0027] The composition of the laser clad...

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Abstract

The invention relates to a split face laser seal coating process in a gas turbine cylinder. The process is characterized in that detection and preparation are carried out before laser cladding of a gas turbine cylinder body; laser cladding is carried out, wherein a all-solid-state 1KW laser is employed during laser cladding, laser cladding is carried out on split face in the gas turbine cylinder, three mutually-parallel seal lines are co-cladded, width of each seal line is 2+/-0.2 mm, and the height is 1+/-0.2 mm, multistage parallel soft metal sealing strips are formed, an air bag-type sealing chamber is formed after a laser cladding layer is subjected to compressional deformation after installation, gradual sealing effect is realized; the sealing strip is sealed after laser cladding and detected and recorded; the sealing strip is treated through pliers, height size and contact area of each point of each strip are ensured; flaw detection is carried out, dye penetrant inspection detection is carried out, no defect is generated on surface and inner part. The process employs laser sealing, and split leakage problem in the cylinder can be effectively solved under matrix performance is not damaged.

Description

technical field [0001] The invention relates to a method for repairing gas leakage from a facet in a turbine cylinder of a gas turbine, in particular to a method for repairing a facet in a turbine cylinder of a gas turbine by adopting a laser sealing coating. Background technique [0002] Due to the long-term use of the cylinder block of the gas turbine, the cylinder block is deformed, and the joint of the central subsurface is not strict, and the gap value can reach a maximum of 1mm and a minimum of 0.2mm. The conventional method to solve this problem is to apply glue to seal, but it often fails to seal, causing air leakage. According to preliminary measurements, the power of the gas turbine will drop by about 1%-2%. At the same time, the temperature of the gas turbine room will be too high, and the load of the fan in the room will be too heavy, which will greatly increase the energy consumption. [0003] As an advanced remanufacturing technology, laser cladding repair tec...

Claims

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Application Information

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IPC IPC(8): C22C19/05C23C24/10
Inventor 崔世荣朴新欣汪立成陈江朱朝军李运强
Owner 上海闸电燃气轮机发电有限公司
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