The surfacing guns leakage

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Even an insignificant leakage also clearly blowholes. Practice, start using a new surfacing gun, sealed, no leakage

Surfacing parts pass rate of over 98%. Gun after use for some time, since the life of the sealing member is low. Began to leak, stomatal gradually out

Currently. With the use of time, more and more serious leakage, the the surfacing layer pass rate drastically reduced. Accordingly, in the welding parameters and the other welding

Conditions remain unchanged, with the use of time, the stomatal more and more, you should consider surfacing gun leakage problem. On

Stomatal described three cases, showed a circular shape, and is not a regular distribution.

(4) powder quality must be guaranteed. The powder mass is one of the causes of blowholes. Powder quality is bad, impure powder, which mixed

Harmful impurities or hollow the silt too much.

The melting point of these harmful impurities are not identical, it is easily mixed with the molten pool, is enclosed within the solder layer surfacing when to produce a different size and shape of the gas

Holes. Stomata often after tu rning process can be found. Easily absorbing harmful gases and impurities within the hollow powder. Therefore, the powder mass

The amount must request, to make it conform to quality standards.

(5) Select the welding parameters of the joints. The lap joints of the weld porosity, which is the most common phenomenon. This problem is also a plasma arc heap

Welding widespread problem. Joints exist stomata is related to many factors, especially the current decay, if not properly controlled, can easily produced in the joints

Angry hole. The decaying current powder feed rate does not match, the part cornstarch (unmelted powder) into the molten bath. The same time, but also because in the lap

When some exhaust impurities introduced such as the surfacing welding characteristics, combined with the pneumatic accessory  welded actual production, plasma welding work < br />
The arts are discussed. Appears in plasma surfacing welding defects were studied mainly on the porosity defects processing are described china solenoid valve .

(6) should be appropriate surfacing current. Surfacing addition the current attenuation prone to porosity, in the surfacing process, since the current is selected to be

Unreasonable also blowholes. If the current is too small, so that the part of the powder is not melted into the weld layers, easy formation of pores. This stomata in turning

After processing, can clearly see the hole residual powder. But the current can not be selected too large, because an excessively large current will puddle agitation too

Severe, resulting in some floating impurities into the solder layer, the same formation of pores. So surfacing current should be a reasonable choice.