When cracks appear on a car bumper, we can use professional welding technology to repair it. The following are the specific repair steps:

　　First, you need to remove the screws at the connection between the bumper and the frame, and remove the entire bumper from the car. This is to ensure that no damage is caused to other parts of the vehicle during the repair process, and to make subsequent operations easier.

　　Next, use a plastic welding gun to weld from the back of the bumper. During the welding process, pay attention to moving the plastic welding rod while heating so that it can be welded evenly on the crack. This step requires certain professional skills and experience, so it is recommended to be performed by professional maintenance personnel.

　　If the bumper is deformed, you can push the concave and convex parts back to their original positions while the grill gun is heating. This is repair using the heating rebound characteristics of plastic materials, which is also one of the advantages of rubber and plastic bumpers.

　　It should be noted that if the bumper is only deformed due to a slight impact, we can use a hair dryer or hot water to heat the part and repair it. Plastic rebounds and returns to its original shape when heated.

　　In short, for the crack problem of car bumper, we can choose the appropriate repair method according to the specific situation. If you are not sure how to operate or need more professional repair services, it is recommended to consult a professional car repair shop or a repair center designated by the insurance company.

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