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Method for strengthening surface of metal turbine runner blade through combination of electric spark deposition and welding

A technology of electric spark deposition and runner blades, which is applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of insufficient hardness and strength of welding rods, short service life, and damage to the bonding layer, and achieve low cost and price , long service life and large coating thickness

Inactive Publication Date: 2016-05-25
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyurethane elastic coating protection has good anti-wear performance, its mechanical strength is poor and it is easy to be scratched. Once it is partially scratched, the adjacent area will be torn; Chemical breakdown, the adhesive layer is destroyed, causing the coating to fall off
[0004] Surface surfacing wear-resistant materials is the main way to repair the wear of turbine runners, but the hardness and strength of the welding electrodes for surfacing repairs are not high enough, the wear resistance is poor, and the service life is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In concrete implementation, the present invention is realized by the following steps:

[0016] (1) Treat the runner of the turbine to remove oil stains, rust spots and oxides, and weld the martensitic stainless steel welding wire to the surface of the runner blade of the turbine with the gas shielded welding equipment. When welding, the current is 230-240A, The arc voltage is 32-36V, the welding speed is 20-30cm / min, the polarity of the power supply is DC reversed, the diameter of the welding wire is 1.1-1.2mm, the length of the welding wire is 15-18mm, and the mixed gas protection of argon and carbon dioxide is used. The volume ratio is 95:5 (that is, the volume percentage is: 95% argon, 5% carbon dioxide), the gas flow is 18-23L / min, and the preheating temperature of the welding zone of the turbine runner is 105-115°C;

[0017] (2) Polish the surface of the welded layer of the turbine runner blade with sand to make the surface smooth, free of cracks, pores, and tracho...

Embodiment 2

[0021] In concrete implementation, the present invention can be realized by the following steps:

[0022] (1) Treat the runner of the turbine to remove oil stains, rust spots and oxides, and weld the martensitic stainless steel welding wire on the surface of the runner blade of the turbine with the gas metal shielded welding equipment. When welding, the current is 235A, and the arc voltage is 34V, welding speed 25cm / min, power supply polarity reversed, wire diameter 1.2mm, wire extension length 16mm, mixed gas protection of argon and carbon dioxide, the volume ratio of argon and carbon dioxide is 95:5, the gas flow 20L / min, the preheating temperature of the welding zone of the turbine runner is 110°C;

[0023] (2) Polish the surface of the welded layer of the turbine runner blade with sand to make the surface smooth, free of cracks, pores, and trachoma;

[0024] (3) Use electric spark deposition equipment to connect the clip connected to the ground wire with the water turbine...

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Abstract

The invention relates to a method for strengthening the surface of a metal turbine runner blade through combination of electric spark deposition and welding. By means of the method, hardness, wear resistance, corrosion resistance, impact resistance and other performance of the surface of the turbine runner blade are effectively achieved, and the service life of a metal turbine runner is prolonged. The method includes the steps of processing the turbine runner to remove greasy dirt, rusty spots and oxide; welding a martensitic stainless steel welding wire to the surface of the turbine runner blade through a consumable electrode gas protection welding device; conducting surface polishing and grinding on the welding layer through an abrasive piece; connecting a clamp with the turbine runner serving as the cathode through an electric spark deposition device, wherein the clamp is connected with a ground wire; depositing a submicron WC-Co ceramic hard alloy electrode stick on a chuck of a deposition gun as the anode; conducting electric spark deposition on the turbine runner blade so that a compound coating and the turbine runner blade can be combined in a metallurgical mode. The method is simple and easy to operate, the thickness of the coating is large, the surface of the blade is high in hardness, good in compactness and good in wear resistance, the service life is long, and cost is low.

Description

technical field [0001] The invention relates to a hydroelectric power generation machine, in particular to a method for strengthening the surface of a runner blade of a metal water turbine by using electric spark deposition combined with welding. Background technique [0002] Water turbine is an important equipment commonly used in hydropower generation. Hydropower generation is one of the important sources of electric energy. In particular, my country is a country rich in hydropower resources in the world. Hydropower has become one of the renewable energy sources that my country focuses on. Hydropower can be developed. The capacity is 380 million kw, and the annual power generation capacity is 1.9 trillion kw.h, which is equivalent to the power generation capacity of 1.1 billion tons of raw coal. One of the characteristics of my country's rivers is the high sediment content. There are 115 rivers with an average annual sediment discharge of more than 10 million tons, and the ...

Claims

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Application Information

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IPC IPC(8): B23P15/02B23P23/04B23K9/167C23C26/02
CPCB23P15/02B23K9/167B23P23/04C23C26/02
Inventor 王建升吴金妹张瑞华李刚唐明奇冯在强王星星
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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