As the saying goes, if you want to do well, you must first sharpen your tools. Before we use stainless steel fans, a correct choice is conducive to the subsequent production efficiency and effect. Why do you say that? Let's take a brief look at Suzhou Panli fans. In order to improve the corrosion resistance of stainless steel fans, the following issues should be paid attention to during welding:
Random arc welding on the surface of stainless steel fan solder joints is prohibited, because local burns on the surface of the solder joints are the source of corrosion, especially stainless steel solder joints with high corrosion resistance; high requirements on the surface of stainless steel should be on both sides of the welding groove during the welding process Apply powder solder paste within the range of 50mm to prevent metal sputtering from destroying the stainless steel surface during the soldering process and affecting the corrosion resistance of the solder.
When assembling tack welding, the tack weld should be accurately welded inside the groove and weldment, and should not move to the surface of the weldment outside the groove; the electrode used for tack welding should be the same as that used for welding, and it is absolutely not allowed to replace it with carbon steel electrode .
The surface of the stainless steel centrifugal fan weldment shall not have nicks, arc marks, stains and slag shells after welding. Otherwise it will cause corrosion of the stainless steel surface, which cannot be ignored. The corrosion resistance of stainless steel can be improved by carefully cleaning or polishing its surface. The surface of stainless steel with small surface roughness can produce a dense and uniform oxide film to protect the internal metal from oxidation and corrosion.
When welding is completed or interrupted, craters should be filled to prevent craters and cracks. When welding, the weldment should be in close contact with the grounding wire to avoid poor contact between the weldment and the grounding wire, causing arc burns on the stainless steel surface and affecting its corrosion resistance. In order to avoid the mixing of carbon and impurities in the weld and affect the corrosion resistance of the stainless steel weld, the side of the weld should be cleaned with acetone within 20-30mm before welding.
Stainless steel fans should not be mixed with ordinary steel during storage or transportation to avoid contamination by impurities such as rust.
The stainless steel surface should avoid scratches or collisions. Especially when scratching materials, do not use scars and punching. Otherwise, it will directly affect the corrosion resistance. Stainless steel solder joints should not be processed by carbon arc to avoid carburization, which is not conducive to the resistance of solder joints to intergranular corrosion.
When calibrating the stainless steel fan casing, direct hammering is not allowed to cause the surface of the workpiece and parts to dent and affect its corrosion resistance. The head and other parts of the container should be formed by cold pressing rather than hot pressing. If hot pressing is required, the change in corrosion resistance should be checked and corresponding heat treatment should be carried out.
When the stainless steel fan is subjected to post-weld heat treatment, no oil, grease and other dirt should remain on the steel surface before heating, and it must be cleaned during heating to avoid carburization. Heat evenly. When the stress relief treatment is carried out above 800~900℃, the heating should be carried out slowly below 850℃. However, the temperature rise above 850°C should be rapid to avoid increasing the tendency of grain growth.
The surface treatment of stainless steel fans, such as grinding, polishing, pickling, passivation, etc., cannot be carried out easily. The treatment process must comply with the operating regulations and the steel surface should be uniformly silver.
Random arc welding on the surface of stainless steel fan solder joints is prohibited, because local burns on the surface of the solder joints are the source of corrosion, especially stainless steel solder joints with high corrosion resistance; high requirements on the surface of stainless steel should be on both sides of the welding groove during the welding process Apply powder solder paste within the range of 50mm to prevent metal sputtering from destroying the stainless steel surface during the soldering process and affecting the corrosion resistance of the solder.
When assembling tack welding, the tack weld should be accurately welded inside the groove and weldment, and should not move to the surface of the weldment outside the groove; the electrode used for tack welding should be the same as that used for welding, and it is absolutely not allowed to replace it with carbon steel electrode .
The surface of the stainless steel centrifugal fan weldment shall not have nicks, arc marks, stains and slag shells after welding. Otherwise it will cause corrosion of the stainless steel surface, which cannot be ignored. The corrosion resistance of stainless steel can be improved by carefully cleaning or polishing its surface. The surface of stainless steel with small surface roughness can produce a dense and uniform oxide film to protect the internal metal from oxidation and corrosion.
When welding is completed or interrupted, craters should be filled to prevent craters and cracks. When welding, the weldment should be in close contact with the grounding wire to avoid poor contact between the weldment and the grounding wire, causing arc burns on the stainless steel surface and affecting its corrosion resistance. In order to avoid the mixing of carbon and impurities in the weld and affect the corrosion resistance of the stainless steel weld, the side of the weld should be cleaned with acetone within 20-30mm before welding.
Stainless steel fans should not be mixed with ordinary steel during storage or transportation to avoid contamination by impurities such as rust.
The stainless steel surface should avoid scratches or collisions. Especially when scratching materials, do not use scars and punching. Otherwise, it will directly affect the corrosion resistance. Stainless steel solder joints should not be processed by carbon arc to avoid carburization, which is not conducive to the resistance of solder joints to intergranular corrosion.
When calibrating the stainless steel fan casing, direct hammering is not allowed to cause the surface of the workpiece and parts to dent and affect its corrosion resistance. The head and other parts of the container should be formed by cold pressing rather than hot pressing. If hot pressing is required, the change in corrosion resistance should be checked and corresponding heat treatment should be carried out.
When the stainless steel fan is subjected to post-weld heat treatment, no oil, grease and other dirt should remain on the steel surface before heating, and it must be cleaned during heating to avoid carburization. Heat evenly. When the stress relief treatment is carried out above 800~900℃, the heating should be carried out slowly below 850℃. However, the temperature rise above 850°C should be rapid to avoid increasing the tendency of grain growth.
The surface treatment of stainless steel fans, such as grinding, polishing, pickling, passivation, etc., cannot be carried out easily. The treatment process must comply with the operating regulations and the steel surface should be uniformly silver.