The hot wall vacuum brazing furnace type

The hot wall vacuum brazing furnace type

Hot-wall vacuum brazing furnace used than the parent metal of low melting point metal materials as solder, use liquid solder wetting fill material and workpiece interface gap and make it with the parent metal diffusion welding method. Suitable for welding precision, complex, and composed of different materials.
According to different welding temperature, the hot wall vacuum brazing furnace can be divided into two broad categories. Welding heating temperature below 450 ℃ is called soft soldering, higher than 450 ℃ is called the brazing. Soft soldering used in electronic and food industries more conductive, airtight and watertight devices of welding. In a tin lead alloys as solder tin welding is the most commonly used. Soft solder generally need to use solder, to remove oxide film, and can improve the wettability of solder. Flux is a lot of more phyletic, the electronic industrial use of rosin alcohol solution soft soldering. The solder residue after welding workpiece non-corrosive effect, called no corrosive soldering flux. Welding flux used in materials such as copper, iron, the zinc chloride, ammonium chloride and vaseline, etc. The need when welding aluminum with fluoride and fluorine boric acid salt as flux, and hydrochloric acid and zinc chloride as flux, etc. The solder residue after welding have corrosion effect, called the corrosive soldering flux, must be cleaned after welding.
Braze welding head high strength, can work under high temperature. There is a wide variety of brazing filler metals, aluminum, silver, copper, manganese and nickel as the base of the most widely used solder. Aluminum solder used in aluminum brazing. Silver base, copper base filler metals are often used for brazing of copper, iron parts. Manganese and nickel based solder used to weld more working under high temperature, such as stainless steel, heat-resistant steel and high temperature alloy parts. Welding of beryllium, titanium, zirconium and other refractory metals, graphite and ceramic materials are commonly used palladium base, zirconium and titanium based solder, etc. The characteristics of the parent metal and should consider when choose solder joint performance requirements. Brazing flux are usually made of alkali and heavy metal chloride and fluoride, or borax, boric acid and fluoboric acid salt, etc, can be made into powder, paste and liquid. Join in some solder lithium, boron, phosphorus, to enhance its ability to remove the oxide film and wetting. After welding flux residue rinse off with warm water, citric acid or oxalic acid.