Brazing Alloys

A filler metal is a metal added in the making of a joint through welding, brazing, or soldering. Four types of filler metals exist—covered electrodes, bare electrode wire or rod, tubular electrode wire, and welding fluxes. Sometimes non-consumable electrodes are included as well, but since these metals are not consumed by the welding process, they are normally excluded.   A variety of alloys are used as filler metals for brazing depending on the intended use or application method. Such as Copper, Copper-zinc(brass), Nickel alloy and Silver. In general, braze alloys are made up of three or more metals to form an alloy with the desired properties. The filler metal for a particular application is chosen based on its ability to: wet the base metals, withstand the service conditions required, and melt at a lower temperature than the base metals or at a very specific temperature. Braze alloy is generally available as rod, ribbon/strips, powde...

 Characteristics of brazing: 1. The surface of the joint is smooth and clean, the air tightness is good, the shape and size are stable, the structure and performance of the weldment have little change, and the same or different metals and some non-metals can be connected. When brazing, heating the workpiece as a whole can also be used to weld many welds at one time, which improves productivity. However, the strength of brazed joints is low, and lap joints are often used to increase the strength of the joint by increasing the length of the lap; in addition, the preparation work before brazing requires higher. 2. The solder melts but the weldment does not melt. In order to make the brazing part firmly connected and enhance the adhesion of the brazing material, brazing flux should be used during brazing to remove the oxides on the surface of the brazing material and the weldment. 3. The brazing filler metal has high strength and can be used to connect load-bearing parts. It is widely...

Northeast Asia copper-aluminum welding materials are simple in operation process, convenient to use, and have strong fluidity. No professional welding equipment and workers are needed. The most common flame brazing (oxygen acetylene, oxygen propane or oxygen liquefied petroleum gas) can be used to easily complete the welding. The following two welding processes can complete the welding of copper-aluminum or aluminum-aluminum: 1. Copper and aluminum flux cored wire After pretreatment of degreasing and rust removal, move the welding torch to evenly heat the parts to be welded. When the temperature reaches about 420℃, add flux-cored wire to make it heated and melt and flow into the joint evenly. After the weld is full, remove the torch and cool down. That's it. 2.Flux paste is matched with brazing wire After the pretreatment of degreasing and rust removal, apply the flux paste to the part that needs to be welded, move the welding gun to evenly heat the part that has been coated with t...

Brazing is a joining process whereby a non-ferrous filler metal alloy is heated to melting temperature (above 800°F) and distributed between two or more close-fitting parts by capillary attraction. At its liquidus temperature, the molten filler metal interacts with a thin layer of the base metal, cooling to form an exceptionally strong, sealed joint due to grain structure interaction. The brazed joint becomes a sandwich of different layers, each metallurgically linked to each other.The brazing process can employ various heat sources such as torch, flame, acetylene, gas/air, induction, resistance, infrared, oven, and furnace. The process of brazing uses filler metals and alloys such as silver, copper, and zinc. Flux is necessary for brazing to remove and prevent reformulation of surface oxides on the base metals.The brazing process produces strong, sealed, leak-proof joints. Brazing uses filler metals in solid form (such as rings and wire, slugs, washers, powder) as well as paste. Prop...

If the brazing operation is not filled with inert gas or in an environment of reduction reaction (ie a furnace), the flux must prevent the formation of oxides when the metal is heated. The flux can also clean the contaminants on the soldering surface. The application of flux can be in the following forms, including slurry, liquid, powder, or prefabricated solder paste that combines flux and solder metal powder. The flux can also be coated on the outer layer of the electrode and embedded in the core of the wire. In these two cases, the free flux will enter the weld bead along with the molten filler metal during heating and joining. Excessive flux should be removed at the end of soldering, because the flux residue in the weld bead can cause corrosion and hinder surface treatment and weld bead inspection. Phosphorus-containing alloy solder is self-fluxing during copper-to-copper welding. The general selection of fluxes is based on their performance on the base metal. In order to be effect...

 Brazing is a welding method. The molten filler whose melting point is lower than the workpiece to be connected is heated to higher than the melting point, so that it has sufficient fluidity, and it is fully filled between the two workpieces by capillary action, and the two are joined after solidification A method of joining together is traditionally called brazing (brazing) when the temperature is higher than 800°F (427°C) in the United States, and vice versa is called soldering (soft soldering). In order to obtain high-quality welded joints, the parts must be tightly installed and the base material must be exceptionally clean and free of oxides. In most cases, the recommended best weld gap is 0.03 to 0.08 mm (0.0012 to 0.0031 inches) to give full play to the capillary joint force. However, it is not uncommon for the weld gap to be as large as 0.6 mm (0.024in) in some cases. The cleanliness of the welding surface is very important, because any contamination will result in poor wet...

 First, the surface of the joint is smooth, airtight, stable in shape and size, and the structure and performance of the weldment does not change much, and the same or different metals and some non-metals can be connected. When brazing, heating the workpiece as a whole can also be used to weld many welds at one time, which improves productivity. However, the strength of brazed joints is low, and lap joints are often used to increase the strength of the joint by increasing the length of the lap; in addition, the preparation work before brazing requires higher. The second is that the solder melts but the weldment does not melt. In order to make the brazing part firmly connected and enhance the adhesion of the brazing material, flux should be used during brazing to remove the oxides on the surface of the brazing material and the weldment. The brazing filler metal has high strength and can be used to connect load-bearing parts. It is widely used, such as cemented carbide cutting tools ...