Most of the fracture of o-type sealing ring occurs on the surfacing welded sealing ring. O-type sealing ring is a kind of surface rubber sealing ring with circular cross section, and its cross section is o-type, so it is called o-type sealing ring. It is a widely used sealing element in hydraulic and pneumatic sealing system. When the material of sealing ring is brittleness, however, it is easy to produce stress crack without strictly following the welding specification and heat treatment. Or improper material selection, structure design does not conform to the system temperature and pressure, will also cause fracture phenomenon. In the process of use, the sealing surface is prone to hydrogen embrittlement and other cracks.

 

So O - seal ring broken can be repaired? Clear answer is ok, want to clear crack carefully above all, even if a bit crack also should be clear and clean, see noumance burnish, without blemish so far. Remove excess dust and material, apply plastic we

base, and then dress in piles. If the surfacing welding cracks tend to be large, the bottom layer of the surfacing welding adopts a good plastic transition layer, which can prevent the surface layer from cracking. Welding repair should be as far as po

short arc, reduce the thermal impact of the area, to prevent (sealing ring) sealing surface deformation. Preheat before repair welding, and slow cooling after welding, preventing cross ventilation during maintenance, and protecting the sealing surface of welding. Slow cooling, reprocessing and forming.

 

Professional welding tools must be used to protect the sealing ring, and the effect will be better. Ammonia gas is a protective gas, which will not be absorbed by metal and welding wire, and the alloy in metal and welding wire will not be burned. Small heat affected area, no slag, porosity, deformation and small. Keep a large or vertical Angle between the nozzle and the sealing surface, so that the solution is always placed under the protection of grams of gas, the welding gun to make a certain swing, wire feeding should be uniform. When the surfacing welding is finished, add more welding wire. Then slowly pull back, maximus gun lift at the same time, after the molten pool is slightly cold, stop the air supply to complete the repair.