1- Knob welding: in which a wick with adhesive material is passed through the hole in the direction from outside the frame to inside it, using a metal machine that has a handle, then cut the excess of the wick that appears from the outside. This type is often damaged and air leakage occurs from it as it reduces The tire is old and should not be used.
2- Patch welding: A patch with adhesive material is attached to the hole from the inner side of the tire, which is good to some extent, but its defect is that the hole is closed from the inside only, but from the outside, the tire remains with a sunken part (the place of the hole from the outside) and thus is vulnerable to dust and water When water enters this part, it touches the internal wires of the frame, and it rusts and damages the frame.. Also, this type of welding may damage and leak air.
3- Hot welding: It is like patch welding, but it increases the exposure of the pierced place and the welding patch – during the welding process – to a hot-temperature piston.. Its disadvantages are the same as the defects of the previous type in addition to another defect that the temperature affects the frame negatively and weakens the part that was exposed to heat and should not be used.
4- Welding mushrooms: It is the best type of welding that international tire companies recommend using. It is a welding patch with an adhesive substance, from the middle of which a rubber tube with adhesive material comes out to the middle and at the end of a metal part. The thickness of the diameter of the tube varies from a large thickness inside (the side of the patch) to a lower thickness at the end and is Its use is to pass the rubber tube with its metal tip from inside the tire to the outside through the hole and then tighten it from the outside well and then cut the excess part.. There are also a set of technical steps carried out by the technician who is conducting the repair process for the tire, including determining a circular shape of the hole and smoothing its edges with a sharp tool Smoothing and scraping the inner part of the tire surrounding the hole and applying an adhesive substance to the patch after it has been glued to ensure that no air leaks and other treatments and technical operations.
This service and this type of welding can be obtained at major tire repair centers.
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