The pit of the single-layer body metal plate is repaired, because the metal plate is stretched, there will be micro-pits compared with the original state. At this time, you can tap gently from behind the pit with a wooden hammer or a plastic hammer, and at the same time, you should choose a suitable wooden block to pad outside the metal plate to prevent the impact of the hammer from bending around the pit.
Pit repair of sandwich metal plate
The four pits are laminated metal sheets or other reasons, so the hammer can't work behind the pits. At this point, the following methods should be adopted for repair.
① Drilling method. This method is suitable for small pits with little damage to sheet metal and paint. Drill a row of small holes in depressions or folds with a hand electric drill. The diameter and spacing of the holes should be determined according to the deformation of the body outer panel. ② Pull ring method. This method is suitable for large area damage and can reduce the damage of excessive perforation to sheet metal parts. As shown in Figure 3-3, put the towing hook into the small hole and pull it out one by one until it is fully recovered. When pulling, each hand can hold two pull rods, and both hands should exert force evenly. Pull slowly, not too hard. After flattening, weld the hole with carbon dioxide gas shielding. The welding method is as follows.
A. The welding gun is perpendicular to the surface of the board and aligned with the center of the hole.
B. Insert the welding wire into the hole, short press the switch to ignite the arc, and then release the switch.
C, the welding wire forms a molten pool in the hole, and then cools and solidifies. If the aperture is large, the welding torch will slowly move to the center of the hole along the periphery of the hole, and the welding spot will be slightly higher than the board surface, which will bring difficulties to polishing, otherwise the strength will be insufficient. @20 19