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Common problems in stainless steel surface treatment and product processing:

1, weld defects: weld defects are serious, using manual mechanical grinding treatment to make up, resulting in grinding marks, resulting in uneven surface, the impact of beauty.

2, the surface is not consistent: only for the weld pickling and passivation, but also caused uneven surface, beautiful appearance.

3, scratch is difficult to remove: overall pickling passivation, also can not remove all kinds of scratches produced in the process, and can not remove carbon steel and splash, which are adhered to the stainless steel surface due to scratches and welding spatter, and lead to rust or electrochemical corrosion under the condition of corrosion medium.

4, grinding and polishing passivation is uneven: manual grinding and polishing after pickling and passivation treatment, the larger area of the workpiece, it is difficult to achieve uniform and uniform treatment effect, can not get an ideal uniform surface. And the cost of working hours, and the cost of auxiliary materials is also high.

5, pickling capacity is limited: pickling and passivation paste is not omnipotent, it is difficult to remove plasma and flame cutting and produce black oxide skin.

6, the damage caused by factors is more serious: in the process of hoisting, transportation and structure processing, the scratches caused by knock, dragging and hammering are more serious, making the surface treatment more difficult and the main reason for the corrosion after the treatment.

7, equipment factors: in profile, plate bending and bending process, scratches and creases are also the main cause of corrosion after treatment.

8, other factors: stainless steel raw materials in the procurement and storage process, due to hoisting, transportation process of bumps and scratches are also more serious, but also one of the causes of corrosion.

Two. Preventive measures:

1, storage, hoisting, transportation

1) storage of stainless steel parts: there should be a special storage frame, the shelf should be wood or surface paint carbon steel brackets or pads with rubber pads, in isolation from other metal materials such as carbon steel. When storage, the storage position should be convenient for lifting, and relative isolation from other materials storage areas, and should have protective measures to avoid pollution of dust, oil, rust and stainless steel.

2) stainless steel hoisting: when hoisting, special sling should be used, such as hoisting belt, special clamp, and so on. Steel wire rope is strictly prohibited to avoid scratching the surface; and when lifting and placing, it should avoid impact caused by bump.

3) transport of stainless steel parts: transportation, the use of transport tools (such as cars, battery cars, etc.), and should be clean and isolated protection measures, in order to prevent dust, oil, rust pollution of stainless steel. It is forbidden to drag and drag to avoid bumping and scratching.

2, processing

1) processing area: the processing area of stainless steel parts should be relatively fixed. Stainless steel processing area platform should take isolation measures, such as rubber pads. The fixed management and civilized production of stainless steel parts should be strengthened to avoid damage and pollution to stainless steel parts.

2) blanking: cutting of stainless steel parts by shearing or plasma cutting and sawing.

Shear: when shearing, it should be separated from the support, and the hopper should also be covered with rubber pads to avoid scratching.

Plasma cutting: after plasma cutting, the slag should be cleaned up. In batch cutting, the finished parts should be cleaned out in time to avoid the stain of the slag.

Sawing and cutting: when sawing and cutting, the clamping should be protected by rubber. After sawing, the oil stain and residue of the workpiece should be cleaned.

3) mechanical processing: stainless steel parts should also be protected during mechanical processing such as vehicle and milling. After finishing operations, oil stains, iron filings and other debris should be cleaned up.

4) forming process: in the process of bending and bending, effective measures should be taken to avoid scratches and creases on the surface of stainless steel parts.

5) riveting: stainless steel parts should be forced to assemble when assembling, especially avoiding flame baking. When plasma cutting is used for group alignment or production process, isolation measures should be taken to prevent slag from polluting other stainless steel parts. After cutting, the slags on the workpiece should be cleaned up.

6) welding: stainless steel parts must be carefully removed before welding, such as oil, rust, dust and other debris. Argon arc welding is adopted as far as possible when welding. Manual arc welding should adopt small current and fast welding to avoid swinging. It is strictly prohibited to strike arcs in the non welded area, and the grounding wire is properly positioned and firmly connected, so as to avoid the abrade of the electric arc. Anti splash measures should be adopted when welding, for example, whitewash. After welding, stainless steel (no carbon steel) flat shovel is used to clean slag and spatter thoroughly.

7) multilayer welding: when welding multilayer, the slag must be removed. For multilayer welding, the interlayer temperature should be controlled, generally not exceeding 60 C.

8) weld: the weld joint should be grinded, and the weld surface should not have the defects such as slag, hole, bite, spatter, crack, non fusion, and non penetration. The weld and the base material should be round and smooth and must not be lower than the parent material.

9) orthopaedics: stainless steel parts should be corrected by flame heating, especially not allowed to reheat the same area. In orthopaedics, mechanical devices should be used as far as possible or hammer hammers with rubber hammers or cushion rubber shall not be hammered by hammers, so as to avoid damaging the stainless steel parts.

10) handling: when the stainless steel parts are carried in the process of processing, the transportation tools (such as small cars, electric vehicles or sky cars, etc.) should be used, and the isolation measures should be clean to prevent dust, oil pollution and rust pollution of stainless steel. It is strictly prohibited to drag directly on the platform or the ground, and it is strictly prohibited to bump and scratch.
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