The first method: ordinary automotive sheet metal method.

This method is aimed at places with relatively flat depressions. Through careful observation, we can know that when welding the stretching point with electric welding machine, we should start from the periphery of the depression first, not from the center, and it is best to use slow force instead of the impact of the sheet metal hammer.

The second method: it can be repaired by frost heaving method.

This method is aimed at the large sag, that is, first drain the oil in the tank, unload the tank from the frame, flush the inside and outside of the tank with water, then turn off the switch of the tank and fill it with clear water. Tighten the box cover, and then put the oil tank filled with clean water into the freezing pool (there are such pools in cold storage, cold storage factories and places where popsicles and sorbets are made) for freezing, and pay attention to slightly exposing the depression to the freezing liquid level.

Extended data:

In addition, it can also be repaired by stretching, crowbar and other methods:

1, which can be repaired by stretching method.

This method is used when the concave area of the fuel tank is small, that is, first, the gasoline in the fuel tank is discharged, then the fuel tank is unloaded from the frame, and then an iron bar with appropriate thickness is found, and one end of the iron bar is welded to the concave part of the fuel tank with tin;

Then clamp the other end of the iron bar in a vise, hold the oil tank with both hands and pull it outward, and repeat it several times, and the sunken part can be restored to its original state. Then iron the iron bar with a soldering iron, clean up the sunken recycling part, and finally paint the sunken recycling part according to the color of the oil tank. After the paint is dried, it can be loaded for use.

2. Clever operation of crowbar

This method is used when the concave area of the fuel tank is small. This method tests patience and eyesight, and is suitable for oil tanks with undamaged paint, especially painted oil tanks. First of all, we should prepare crowbars with various bending angles and small hammers with rubber heads, and rubber heads should also be installed on crowbars. Secondly, lamps with strip lights should be equipped. Finally, enough patience and time are needed.