1. Welding: Welding methods mainly include arc welding, electroslag welding, gas welding, plasma arc welding, fusion welding, pressure welding, and brazing. The welding of sheet metal products is mainly arc Welding, gas welding. Arc welding has the advantages of flexibility, mobility, wide applicability, and can be used for all-round welding; the equipment used is simple, durable, and low maintenance costs. However, the labor intensity is high and the quality is not stable, which depends on the level of the operator. Suitable for welding carbon steel, low-alloy steel, stainless steel, copper, aluminum and other non-ferrous alloys above 3mm. The gas welding flame temperature and properties can be adjusted. The heat source of arc welding is wider than the heat affected zone, and the heat is not as concentrated as the arc, and the productivity is low. It is used for thin walls. Welding of structures and small parts can weld steel, cast iron, aluminum, copper and its alloys, hard alloys, etc.

2. Stretching: The radius of the fillet between the bottom of the stretched part and the straight wall should be greater than the thickness of the board, that is, r1≥t. In order to make the stretching process more smoothly, generally r1=(3~5)t, and the fillet radius should be less than or equal to 8 times the plate thickness, that is, r1≤8t. Because the tensile parts are subjected to different stresses everywhere, the thickness of the material after stretching will change. Generally speaking, the center of the bottom maintains the original thickness, the material at the bottom rounded corners becomes thinner, the material at the top near the flange becomes thicker, and the material at the rounded corners around the rectangular stretched part becomes thicker.

3. Blanking: According to the different processing methods, the blanking can be divided into normal punching, number punching, shear cutting, laser cutting, and wind cutting, because of the processing method The processing technology of the blanking is also different. Sheet metal blanking methods are mainly digital punching and laser cutting.

Four. Bending: When the material is bent, the outer layer is stretched on the rounded corners, while the inner layer is compressed. When the thickness of the material is punctual, the smaller the inner r, the more severe the stretching and contraction of the material; when the tensile stress of the outer fillet exceeds the ultimate strength of the material, cracks and breaks will occur. Therefore, the bending of the part The structure design should prevent the bend radius from being too small.

V. Forming: Pressing ribs on the plate-shaped metal parts helps increase the structural rigidity. The shutters are generally used for various covers or casings to provide ventilation and heat dissipation. The forming method is to cut the material with one edge of the punch, and the rest of the punch will stretch the material together to form a high and low shape with one side opening.