Plasma arc surfacing is used to manufacture the valve sealing surface

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Has achieved good results. The key parts of the sealing surface of pneumatic accessory  products, its high quality requirements, not only requires high hardness and anti-abrasion performance

, And does not allow any macroscopic defects, such as pores, cracks. The surfacing layer pores are the most common, but also the most difficult problem in the production. Gas

Hole reasons: oil, rust and other impurities in the surface of the workpiece; parent material weldability is poor; transfer arc current is too large, a large number of matrix mixed with solder layer;

Protect the poor or argon depletion resulting in high purity; powder humidity and impurities; powder particles the hollow lead to the gas can not escape in a timely manner (this

Welding, you can hear the crisp sound of explosions); powder containing low melting point impurities in high temperature gasification; parent material containing impurities; parent material

Chemical treatment. According to the live production experience, the plasma arc surfacing layer pores exclude a few remarks.

(1) the workpiece surface should be clean, oil, rust, etc. are not permitted. Decompose at high temperatures because of oil pollution, harmful gases, rust-shaped

The harmful oxides, surfacing layer formation of pores china solenoid valve .

(2) surfacing powder to be dried, since the wet powder containing moisture. Surfacing process, the powder is melted, while the moisture generated by the decomposition of

Gas, wherein a part of discharged while another portion is brought into the molten bath to form pores. Therefore, spray powder must go through about 200 ℃ bake

Baked, the baking time is generally not less than 2 hours. Timely use baking powder, such as placing a long time, you should re-baking.

(3) strict control of plasma arc leak surfacing guns.