Usually according to the requirements of the drawings. When penetration is needed, a gap of more than 0.5+ shall be left according to the actual situation to ensure penetration. Of course, the size of the gap affects the deformation of the sheet metal part, the appearance of the weld, the bearing capacity and so on. In particular, the welds of some special materials should be strictly in accordance with the standards. In short, according to the drawings and standards, control the body design and peripheral clearance.
Repair method of sheet metal depression
A method for repairing automotive sheet metal parts is to put a suction cup in a concave part, use a vacuum pump to remove air from the suction cup, then pull the concave part out by pulling the suction cup, and then knock it back.
In fact, car dent repair is different from sheet metal. Sheet metal is only roughly shaped, but the dent repair of automobile needs to be slightly shaped while retaining the original car paint. Put a sucker in the concave part, use a vacuum pump to suck the air out of the sucker, then pull the sucker out of the concave part and knock it back.
The repair of automobile dents requires micro-shaping while retaining the original car paint. The reason why the dents in the metal plate are repaired from the inside is that the force needs to act directly on the steel plate and has no effect on the paint surface itself. But in general, when the dent is large, the glue stick is used to operate directly on the paint surface, because the glue stick will stick to the dent after heating and will not damage the paint surface during drawing.