O-RING FRACTURE CAUSES AND REPAIR MEASURES

As a common sealing element, O-ring plays an important role in mechanical, hydraulic, pneumatic and other fields. However, in practical applications, the O-ring sometimes breaks, which will not only affect the normal operation of the equipment, but also may lead to serious problems such as leakage. The following is a detailed discussion of the various reasons for the fracture of the O-ring.

Overload: If the O-ring works beyond its design load, it may lead to fracture. For example, if the rated load that the rubber ring can withstand is 10N and the working environment is 20N, it is easy to break under this overload.

Hydraulic aging: Material aging is an important cause of fracture. Over time, the rubber material will gradually become brittle due to oxidation, ozone, thermal energy, etc., and eventually lead to fracture.

Corrosivity: In a chemically corrosive environment, if an inappropriate material is used, it may cause the O-ring to break quickly.

Excessive compression rate: If the O-ring is overcompressed, it may lead to damage, cracks, etc.

Extrusion: If the pressure is too high and the gap between the sealing surface is too large, the O-ring may be squeezed out and crack.

Thermal failure: Overcooling or overheating may cause the O-ring to lose its elasticity and mechanical strength and eventually break.

Chemical failure: Contact with chemicals may lead to elastomer cross-linked fracture, elastomer hardening and embrittlement.

Improper design: The design of the O-ring is unreasonable. If the groove is not properly designed, it may also lead to fracture.

Installation problems: If the O-ring is subjected to tensile or compression stress during installation, it may also lead to fracture.

Material problem: O-rings made of poor quality materials may be easy to break.

After the O-shaped sealing ring is broken, it can be repaired and used. According to the search results, the following are some suggestions and steps to repair the O-shaped seal:

Clean the gap: First of all, it is necessary to remove the dust and residue at the fracture to ensure that the gap is smooth and dust-free.

Use welding wire: Select the welding wire with good plasticity as the inner match, and then spray welding. If the crack is large, the connection layer may be applied.

Welding process: In the welding process, it is recommended to use a short arc to reduce the damage of heat to the O-type seal ring. It should be heated before welding and cooled slowly after welding to avoid the occurrence of heat-affected areas.

Professional welding tools: In the welding process, professional welding tools should be used to ensure that the welding nozzle and protrusion surface are vertical or left at a certain angle, and the welding machine should be uniform.

Note: The repaired O-shaped seal should avoid excessive load and rapidly changing temperature when using it to extend its service life.

Regular inspection: In order to ensure that the repaired O-shaped seal can be used effectively for a long time, it is recommended to check regularly to find and deal with possible problems in time.