Use a knife to cut the slope of the plastic layer at a 45-degree angle to a plastic block or strip of the same shape, color, and thickness. After fixing it with a pliers or a screwdriver, use a hot air speed welding gun and then use copper foil to compact it. , Compaction, flattening, and finally spark test, no breakdown is qualified.

The plastic defect is scraped with a knife, and the recessed part is filled with the same plastic strip under the action of a hot wind plastic welding torch, then flattened, pressed and compacted with a copper piece at the defect repairing place, and the spark test is performed without breakdown. Qualified.