When selecting materials for sheet metal stamping, the following precautions should be taken

Bending process

Bending process is also an important process in sheet metal manufacturing. Common box type parts, such as transformers and substations, require sheet metal bending, and there are many factors that affect the bending process.

The most important ones are the bending radius and edge height:

(1) Bending radius

Generally speaking, in the process of sheet metal bending, when the thickness of the material is determined, the material is subjected to external tension. As the bending radius becomes smaller, the tensile stress will increase. Therefore, when bending, it is necessary to choose a suitable bending angle to avoid increasing tensile stress due to a small bending radius inside the bending, which may cause damage or fracture to the workpiece;

(2) Bend height

During the sheet metal bending process, multiple bending edges are generated, and the height of these edges is not arbitrarily designed. It is necessary to control the height of the bending edges based on the width of the groove and the accuracy of the bending forming.

03 Welding process

Most sheet metal products require welding, but there are many factors that affect welding and are difficult to control. After welding, deformation problems often occur. Therefore, when welding, we should choose the appropriate welding method as much as possible to avoid defective products caused by welding problems.

There are several factors that affect welding, including:

(1) Welding current

Welding current has a significant impact on welding quality and productivity. The current is too small, the arc is unstable, which can easily cause slag inclusions and unwelded defects, resulting in low production efficiency; Excessive current, easy to bite and burn defects, and increased splashing. Therefore, during welding, the appropriate current should be selected based on the type of electrode, electrode diameter, and thickness of the welded component;

(2) Arc voltage

During the welding process, if the arc is too long, it will cause unstable arc combustion, increased spatter, reduced penetration depth, and easy infiltration of external air, resulting in defects such as porosity. Therefore, the arc length must be less than or equal to the diameter of the electrode, i.e. short arc welding. When using acidic welding rods for welding, in order to preheat the welding position or reduce the temperature of the molten pool, sometimes the arc is slightly elongated, which is called long arc welding;

(3) Welding method

Due to uneven temperature during welding, different heat treatments are applied around the weld seam, resulting in corresponding changes in microstructure and properties. Common methods used in metal welding include submerged arc welding, manual welding, and carbon dioxide shielded welding. Among them, submerged arc welding has the highest heat and shrinkage deformation, manual welding is in the middle, and carbon dioxide shielded welding is secondary.


In addition to the factors that affect welding mentioned above, there are actually many other influencing factors. This is a vast discipline, and those interested can delve deeper into it. In summary, the design of sheet metal not only requires optimizing the design method, but more importantly, optimizing the sheet metal process, which will directly determine the quality of sheet metal products. There are many factors that affect sheet metal process, and we cannot completely eliminate the impact of sheet metal process on products. We can only minimize the impact as much as possible in order to produce high-quality products.