The O-ring can bring a good sealing effect, with it, can protect some items from leaking air. It's basically a circle, like the letter O. If it is broken, it should be repaired in time, otherwise it will affect the sealing effect.
1, first carefully remove cracks, even a little crack should be clear and clean, straight to the O-ring luster, no defects, groove into U shape.
2, metal removal more, the application of plastic good electrode (wire) as a base, and then trim piles of grooves. If the surfacing crack tendency is large, the bottom layer of surfacing welding adopts a transition layer with good plasticity, which can prevent the surface crack. In welding repair, it is necessary to use short arc as much as possible to reduce the area of thermal influence and prevent the deformation of the sealing surface. It is necessary to preheat before welding, keep heat and cool slowly after welding, prevent drafts and protect the O-ring sealing surface from surfacing welding. After slow cooling, reprocessing and forming. Repair welding with subarc defending, the effect will be better, ammonia is a protective gas, not absorbed by metal and welding wire, metal and welding wire alloys are not burned.
3, argon arc welding, the nozzle and the sealing surface to maintain a large or vertical Angle, so that the solution is always placed under the protection of the gas, the welding gun to make a certain swing, wire feed to be uniform, the beginning of the joint to natural transition. At the end of surfacing welding, a little more wire should be added. Then slowly open, defending the gun at the same time. However, it is necessary to continue to send argon gas, and stop the gas supply after the tungsten electrode and the molten pool are slightly cold.
4, so in order to be able to make the O-ring have a good sealing effect, we also need to do a good job of repair work, in the repair should be timely removal of excess impurities. At the same time, we try to stay away from sharp objects when using them. Prevent breakage.