Problems and Solutions in the Processing of Forged Stainless Steel Flanges

Release time:

2020-09-22

The machining of stainless steel forged flanges requires understanding and attention to the following issues: 1. Welding defects: Once welding defects appear in stainless steel forged flanges, they can become quite serious. If manual mechanical grinding is used to rectify these defects, the resulting grinding marks will lead to an uneven surface, adversely affecting the appearance. 2. Uneven polishing and passivation: After manual polishing and buffing, the subsequent pickling and passivation treatment is difficult to achieve a uniform effect over large areas of stainless steel forged flanges, making it impossible to obtain an ideally uniform surface. Additionally, this process has drawbacks such as high labor costs and elevated costs for auxiliary materials.

The machining of stainless steel forged flanges requires understanding and attention to the following issues:

1. Welding defects: Once weld defects appear in stainless steel forged flanges, they tend to be quite serious. If manual mechanical grinding is used to rectify these defects, the resulting grinding marks can lead to an uneven surface, thereby affecting the appearance.

2. Uneven grinding, polishing, and passivation: After manual grinding and polishing, the subsequent pickling and passivation treatment makes it difficult to achieve uniform results over large areas of stainless steel forged flanges, thus failing to produce an ideally uniform surface. Additionally, this process suffers from drawbacks such as high labor costs and elevated expenses for auxiliary materials.

3. Scratches are difficult to remove: In the presence of corrosive media, stainless steel forged flanges undergo overall pickling and passivation, chemical corrosion, or electrochemical corrosion, making it impossible to remove rust. Carbon steel, spatter, and other impurities adhere to the surface of stainless steel forged flanges due to scratching and welding spatter.

Given the many challenges involved in manufacturing stainless steel forged flanges, how can these processing issues be addressed?

1 Select the hidden option. Once completed, proceed to the next step. Different stainless steel forged flange workpieces will employ corresponding processes based on their specific machining requirements.

2 When bending, it is essential to first determine the thickness of the stainless steel seamless steel pipe based on the dimensions specified in the drawing. The key to selecting the upper die is to avoid deformation of both the product and the cutting tool during bending due to collisions between the tool and the groove (different types of upper dies can be used for the same product). The selection of the lower die depends on the thickness of the stainless steel forged flange plate.

3 To achieve a strong weld, protrusions are formed on the workpieces to be welded. Before applying electric current for welding, these protrusions can make uniform contact with the plates, ensuring that each spot of the stainless steel forged flange is heated consistently. At the same time, this setup allows for precise determination of the welding positions. Welding parameters—such as preheating time, holding time, maintenance time, and cooling/rest periods—must be carefully adjusted to ensure a solid spot weld on the workpieces.