Holding time Vacuum brazing is performed under vacuum radiant heating conditions. Although the thickness of the base material is not large, but considering that the brazed joint is partially covered after the furnace is installed, it can not be directly affected by radiant heat, resulting in a working temperature difference. We temporarily suspend the heating when heated to the temperature below the liquidus of the solder. This temperature is kept for a certain period of time, the purpose of which is to reduce the temperature gradient of the components, so that the temperature welding and cutting degree of each part is uniform.
Cooling Because the vacuum silver brazing temperature is above the melting point of the silver-copper alloy solder, and it is kept warm at a proper time, the silver-copper alloy at this time has melted into a liquid and has a certain fluidity. The silver-copper alloy has excellent electrical conductivity as a plasma arc-cutting electrode solder, wettability during brazing, and better filling ability. It is an ideal brazing material for numerically controlled plasma arc cutting electrodes. In the experiment, we first pre-cooled the components below the melting point of the solder, and then quickly cooled the N2 gas to ensure that the components are in a good position to obtain satisfactory brazing quality.
After the CNC plasma arc cutting electrode was brazed with vacuum silver, it was in good condition. Imported plasma arc cutting electrode using cutting distance plasma arc cutting electrode brazing assembly welding metallographic picture distance is 300m, and the use of vacuum silver brazing cutting distance has reached more than 500m, has been promoted and applied in some domestic key enterprises. Gradually replacing imports, it is generally well received. From the perspective of the use of cylinder head bolts, the early failure of bolts (such as bolt breakage or fatigue, etc.) is reduced. From the scene, the working environment was improved, and the original fumes filled the ground and the condition of oil stains on the ground was fundamentally improved.
Palmitic Acid,Acrylic Acid,Palmitic Stearic Acid,Stevia Organic Solvent
ShanDong DeXiang International Trade Co.,Ltd , https://www.dexiangchemical.com