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How to protect the appearance of forgings?

Update:21-01-2021
Summary:

Forging refers to a workpiece or blank obtained by forg […]

Forging refers to a workpiece or blank obtained by forging and deforming a metal blank. By applying pressure to the metal blank, it produces plastic deformation, which can change its mechanical properties. According to the temperature of the blank during processing, forgings can be divided into cold forging and warm forging and hot forging. Cold forging is generally processed at room temperature, and hot forging is processed at a temperature higher than the recrystallization temperature of the metal blank.
The protection of the appearance of forgings should include forging storage, forging lifting, forging transportation, processing area, welding, etc.
Forging storage: there should be a special storage rack, the storage rack should be wooden or painted carbon steel bracket or pad with rubber pad to isolate it from carbon steel and other metal materials. When storing, the storage location should be convenient for hoisting, relatively isolated from other material storage areas, and protective measures should be taken to avoid contamination of stainless steel by dust, oil, and rust.

 

Forging

Hoisting of forgings: When hoisting, special hoisting tools, such as hoisting belts, special chucks, etc., should be used. Wire ropes are strictly prohibited to avoid scratching the surface, and when hoisting and placing, avoid impacts and scratches.
Forging transportation: When transporting, use transportation tools (such as trolleys, battery carts, etc.), and should be clean with isolation and protection measures to prevent dust, oil, and rust from polluting stainless steel. Procrastination is strictly prohibited to avoid bumps and scratches.
Processing area: The processing area of ​​the forging should be relatively fixed. The platform of the forging processing area should be isolated with rubber pads. The fixed management and civilized production of the forging processing area should be strengthened to avoid damage and pollution to the forging.
Blanking: The blanking of forgings adopts shearing, plasma cutting, sawing, etc.
Machining: Forgings should also be protected during machining such as turning and milling. After the operation is completed, the surface of the workpiece should be cleaned of oil, iron filings and other debris.
Forming processing: In the process of coiling and bending, effective measures should be taken to avoid scratches and creases on the surface of stainless steel parts.
Riveting welding: when forgings are assembled, compulsory assembly should be avoided, especially flame baking assembly should be avoided. If plasma cutting is used temporarily during the assembly or production process, isolation measures should be taken to avoid contamination of other stainless steel parts by cutting slag. After cutting, the cutting residue on the workpiece should be cleaned up.
Welding: The oil, rust, dust and other debris must be carefully removed before forgings are welded. When welding, use argon arc welding as much as possible. When using manual arc welding, use low current and fast welding to avoid swinging. It is strictly forbidden to ignite the arc in the non-welded area, and the ground wire is located properly and connected firmly to avoid arc damage. Anti-splash measures (such as white ash, etc.) should be taken during welding. After welding, use a stainless steel (no carbon steel) flat shovel to thoroughly clean the slag and spatter.
Multi-layer welding: When multi-layer welding, the slag between layers must be removed. During multilayer welding, the temperature between layers should be controlled, generally not exceeding 60°C.

Forging

Welding seam: The welded seam should be ground. The surface of the welded seam should not have defects such as slag, pores, undercut, spatter, cracks, lack of fusion, and incomplete penetration. The weld and the base metal should be smoothly transitioned and not lower than the base metal. .
Orthopedics: For the orthopedics of forgings, flame heating methods should be avoided, especially repeated heating of the same area is not allowed. When orthopedic, try to use mechanical devices, or hammer with a wooden hammer (rubber hammer) or a rubber pad, and it is forbidden to hammer with an iron hammer to avoid damage to the forging.
Handling: When forgings are handled during processing, transportation tools (such as trolleys, battery carts or cranes, etc.) should be used, and isolation and protection measures should be taken to prevent dust, oil, and rust from polluting the stainless steel. It is strictly forbidden to drag directly on the platform or the ground, and it is strictly forbidden to bump and scratch.More about:hot forging steel Manufacturers

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