The surface of stainless steel pipes needs to be treated before welding3Some preparations, do you understand? The surface of stainless steel pipes needs to be treated before welding3Some preparations, do you understand? Regarding this issue, the editor has looked up some materials and summarized them3Point:10%H2SO4,15%HC,5%HNO3,Surplus water. Pickling temperature100℃Pickling moment30s,Then use15%HNO3The aqueous solution is used for gloss treatment.
Solution temperature100℃At the appointed time10s6%H2SO2,10%HNO3,50g/LHFThe aqueous solution of. Pickling temperature20℃Pickling moment10min.Use after acid washing60-70℃Wash carefully with hot water10min,Then60-70℃It is dry in the hot air.NO,50g/LNaF,85%H2OSolution.
Erosion at room temperature5~10min,Then wash it with hot water100120℃Dry at a certain temperature. Sometimes, when it is necessary to use a certain filler metal or brazing process for some reason, the filler metal may not be easily moistened by the base metal. At this time, a thin layer of metal that is easily moistened by the filler metal can be plated on the surface of the base metal before brazing. Copper and nickel are commonly used as coating materials.
Because no matter which brazing method is adopted, the oxide film and oil stains on the surface of the workpiece need to be cleaned and removed before welding. Oil removal can be carried out by methods such as gas-phase oil removal, solvent cleaning, and cleaning with sodium hydroxide water solution. Degreasing solvents include ethanol, ether, methanol, acetone and industrial degreasing agents. Among them, cleaning the oil stains on the surface of small-batch workpieces with acetone is a simple method.
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