Processing and storage of stainless steel parts

Processing and storage of stainless steel parts

Storage of stainless steel parts: There should be a special storage rack. The storage rack should be made of wood or painted carbon steel bracket or mat with rubber mat to isolate it from other metal materials such as carbon steel. When storing, the storage location should be easy to lift, and relatively isolated from other material storage areas. Protective measures should be taken to avoid contamination of stainless steel by dust, oil and rust.

Problems in the processing of stainless steel products!

1. Weld defect: The weld defect is serious, and it is compensated by manual mechanical grinding method. The resulting grinding marks cause uneven surface and affect the appearance.

2. Inconsistent surface: only the pickling passivation of the weld seam, also caused the surface to be uneven, affecting the appearance.

3. Scratch is difficult to remove: the whole pickling passivation can not remove all kinds of scratches generated during the process, and it can not remove carbon steel, splash and other impurities adhered to the stainless steel surface due to scratches and welding splashes. Causes rusting due to chemical or electrochemical corrosion in the presence of corrosive media.

4. Grinding and polishing passivation unevenness: pickling and polishing after pickling and polishing, it is difficult to achieve uniform and uniform treatment effect on the workpiece with large area, and the ideal uniform surface cannot be obtained. And the cost of working hours and the cost of accessories are also high.

5. Limited pickling ability: Pickling passivation paste is not omnipotent. It is difficult to remove for plasma cutting, flame cutting and black scale.

6. Scratches caused by human factors are more serious: in the process of hoisting, transportation and structural processing, the scratches caused by human factors such as bumping, dragging and hammering are serious, which makes the surface treatment more difficult and also causes corrosion after treatment. The main reason.

7. Equipment factors: In the process of profile, sheet bending and bending, scratches and creases are also the main cause of corrosion after treatment.

8. Other factors: During the process of purchasing and storing stainless steel raw materials, bumps and scratches caused by lifting and transportation are also serious, and it is also one of the causes of rust.

Stainless steel hoisting: When hoisting, special slings should be used, such as slings, special chucks, etc. It is strictly forbidden to use steel wire rope to avoid scratching the surface; and when lifting and placing, avoid impact and bumping.

Transportation of stainless steel parts: When transporting, use transportation tools (such as trolleys, battery cars, etc.), and clean and isolate protective measures to prevent dust, oil and rust from contaminating stainless steel. Do not drag and drop to avoid bumps and scratches.

Processing of stainless steel parts

1. Processing area: The processing area of stainless steel parts should be relatively fixed. The platform of the stainless steel processing zone should be isolated, such as rubber mats. The fixed management and civilized production of the processing zone of stainless steel parts should be strengthened to avoid damage and pollution of stainless steel parts.

2. Unloading: The cutting of stainless steel parts adopts shearing or plasma cutting, sawing and the like.

a. Shearing: When cutting, it should be isolated from the feeding bracket. The falling hopper should also be covered with rubber mat to avoid scratching.

b. Plasma cutting: After plasma cutting, the cutting slag should be cleaned. When cutting in batches, the existing parts should be cleaned up in time to avoid smudging of the workpiece.

c. Sawing and cutting: When sawing and cutting, the clamping should be protected by rubber. After sawing, the oil and residue on the workpiece should be cleaned.

Machining: Stainless steel parts should also be protected during machining such as turning, milling, etc. The oil stains, iron filings and other debris on the surface of the workpiece should be cleaned up.

Molding processing: In the process of coiling and bending, effective measures should be taken to avoid scratching and creases on the surface of stainless steel parts.

Welding of stainless steel parts

Stud welding: When the stainless steel parts are paired, the forced assembly should be avoided, especially the flame grilling assembly is avoided. If there is temporary plasma cutting in the group or manufacturing process, isolation measures should be taken to avoid contamination of other stainless steel parts by the slag. After cutting, the cut slag on the workpiece should be cleaned.

Welding: Stainless steel parts must be carefully cleaned of oil, rust, dust and other debris before welding. When welding, argon arc welding should be used as much as possible. When using manual arc welding, small current and fast welding should be used to avoid swinging. It is strictly forbidden to start arcing in the non-welding area. The grounding wire is in proper position and connected firmly to avoid arc abrasion. Anti-splash measures (such as brushing white ash) should be taken during welding. After welding, use stainless steel (not carbon steel) flat shovel to thoroughly clean the slag and splash.

Multi-layer welding: When welding in multiple layers, the interlayer slag must be removed. For multi-layer welding, the interlayer temperature should be controlled, generally not exceeding 60 °C.

Weld: Weld joints shall be ground. The surface of the weld shall be free of defects such as slag, pores, undercuts, splashes, cracks, unfused, and incomplete penetration. The weld and the base metal shall be smoothly transitioned, not lower than the base metal. .

Orthopaedic: The orthopedics of stainless steel parts should avoid the use of flame heating methods, especially the repeated heating of the same area. When orthopedic, try to use mechanical devices, or use a wooden hammer (rubber hammer) or a rubber pad to hammer, do not hammer with a hammer to avoid damage to stainless steel parts.