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Classification Of Brazing Paste
Jun 30, 2017

              Shan Soft brazing: brazing solder melting point is lower than 450, joint strength is lower (less than MPA). Soft brazing is used for the welding of conductive, airtight and watertight devices in electronic and food industry. Tin-lead alloys are the most commonly used for soldering solder. The soft solder usually needs to use the filler to remove the oxide film and improve the wetting property of the filler. Many kinds of brazing agent, the electronic industry uses rosin alcohol solution soft brazing. The solder residue after welding has no corrosive effect on the workpiece, which is called non-corrosive brazing agent. Soldering copper, iron and other materials used in the solder, from zinc chloride, ammonium chloride and Vaseline and other components. It is necessary to use fluoride and fluorine borate as brazing agent in the welding of aluminum, and it is also useful as brazing agent for hydrochloric acid plus zinc chloride. The solder residue after welding has corrosive effect, known as corrosive solder, must be cleaned after welding.Brazing Paste

              Shan hard brazing: brazing solder melting point is higher than 450, joint strength is higher (greater than MPA). Hard brazed joints have high strength and some can work at high temperatures. There are a wide variety of brazing filler, the most widely used brazing materials are aluminum, silver, copper, manganese and nickel. Aluminum base brazing is often used for brazing of aluminum products. Silver and copper-based brazing materials are often used for brazing of copper and iron parts. The manganese base and the nickel base solder are used to weld the stainless steel, the heat-resisting steel and the high-temperature alloy. Welding beryllium, titanium, zirconium and other refractory metals, graphite and ceramics and other materials commonly used palladium, zirconium and titanium base, such as filler. The characteristics of the masterbatch and the requirements for the performance of the joints should be taken into account when selecting brazing materials. Brazing solder is usually made of alkali metal and heavy metal chloride and fluoride, or borax, boric acid, fluorine borate, etc., can be prepared into powdery, mushy and liquid. Lithium, boron and phosphorus are added to some solders to enhance their ability to remove oxide membranes and wetting. The solder residue is cleaned with warm water, citric acid or oxalic acid.Brazing Paste

            Note: The contact surface of the parent material should be very clean, so use the solder. The effect of the solder is to remove the oxide and oil impurities on the surface of the masterbatch and solder, to protect the contact surface of the solder and the base material from being oxidized, and to increase the wettability and capillary fluidity of the solder material. The melting point of the brazing agent should be lower than that of the solder, and the corrosion of the solder residue on the base material and the joint should be less. Soldering commonly used in soft soldering is rosin or zinc chloride solution, and brazing agent is a mixture of borax, boric acid and alkaline fluoride.Brazing Paste


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