Brazing Alloys

 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 use

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 wettabi

 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 and

 Because stainless steel contains Cr, Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other metal elements, there are many types of surface oxides, among which chromium and titanium oxides have the best chemical stability. Must use very active flux and shielding gas or high vacuum brazing method. According to the use requirements of the brazing parts, the performance of the brazing joint, the brazing temperature, etc., different solders and brazing materials can be selected. Since chromium will form a stable oxide, a very active flux should be used. When soldering, zinc chloride hydrochloric acid solution, zinc chloride monochloromethane hydrochloric acid solution or phosphoric acid must be used. 

The oxides on the surface of carbon steel are FeO, Fe2O3 and so on. In addition to iron oxide on the surface of low-alloy structural steel, oxides of alloying elements may also be formed. Except for chromium and aluminum oxides which have greater influence, other oxides are easier to remove. When soldering carbon steel and low-alloy steel, various solders can be used, of which tin-lead solder is the most widely used. When copper, copper-based solder and silver-based solder are used for brazing, higher joint strength can be obtained.

 The main technological parameters of the brazing process are the brazing temperature and holding time. The brazing temperature is usually selected to be 25-60℃ higher than the liquidus temperature of the solder to ensure that the solder can fill the gap. The brazing holding time depends on the size of the workpiece and the intensity of the interaction between the brazing filler metal and the base metal. The holding time of large parts should be longer to ensure uniform heating. If the brazing filler metal has a strong effect on the base material, the heat preservation time should be short. Generally speaking, a certain holding time is necessary to promote the mutual diffusion of the solder and the base metal to form a firm bond. But too long holding time will lead to defects such as melting. There are many common brazing process methods, which are mainly distinguished by the equipment used and the working principle. If distinguished by heat source, there are infrared, electron beam, l

 Brazing is not suitable for welding general steel structures and heavy-duty and dynamic-loaded parts. It is mainly used to manufacture precision instruments, electrical parts, dissimilar metal components, and complex thin plate structures, such as sandwich components, honeycomb structures, etc. It is also commonly used for brazing various types of abnormal wires and carbide tools. During brazing, after cleaning the contact surface of the workpiece to be brazed, it is assembled in the form of overlap, and the brazing material is placed near the joint gap or directly into the joint gap. When the workpiece and the solder are heated to a temperature slightly higher than the melting temperature of the solder, the solder will melt and infiltrate the surface of the solder. The liquid solder will flow and spread along the joint by means of capillary action. Then the metal to be brazed and the brazing filler metal dissolve each other, penetrate each other to form an alloy layer, and form a bra

 1. The brazing heating temperature is low, which has little effect on the structure and performance of the base material; 2. The brazing joint is flat and smooth, and the appearance is beautiful; 3. The deformation of the weldment is small, especially when uniform heating is used (such as brazing in a furnace). ) Brazing method, the deformation of the weldment can be reduced to a minimum, and it is easy to ensure the dimensional accuracy of the weldment; 4. Some brazing methods can weld dozens or hundreds of brazing seams at a time, with high productivity; 5 .Can realize the connection of dissimilar metals or alloys, metals and non-metals. However, brazing also has its own shortcomings: the strength of the needle welded joint is relatively low, and the heat resistance is relatively poor. The electrochemical corrosion caused by the large difference between the base material and the solder composition results in poor corrosion resistance and relatively high assembly requirements.

Brazing refers to a welding method in which the solder below the melting point of the solder and the solder are heated to the melting temperature of the solder at the same time, and then the gap of the solid workpiece is filled with the liquid solder to connect the metal. When brazing, firstly remove the oxide film and oil stains on the contact surface of the base material, so that the capillary will play a role after the solder is melted and increase the wettability and capillary fluidity of the solder. According to the melting point of the solder, brazing is divided into brazing and soft brazing.The brazing deformation is small, and the joints are smooth and beautiful. It is suitable for welding precise, complex components and components composed of different materials, such as honeycomb structural plates, turbine blades, cemented carbide tools and printed circuit boards. The weld formed by brazing is called brazing. The filler metal used in brazing is called brazing filler metal. Th

 The aluminum flux cored wire consists of aluminum silicate alloy in strip form that is rolled around a white, powdered fluoride flux. The flux is non-corrosive and non-hygroscopic. It ‘s used to braze for joining copper to aluminum, brass to aluminum and aluminum to aluminum by flame brazing, induction brazing and furnace brazing. We have supplied the materials used by flame brazing, induction brazing and furnace brazing for air conditioners, evaporators, condensers, compressors, refrigerators, freezers, ice machines, etc.

Silver brazing alloys, suitable to join easily a wide range of ferrous and non-ferrous base materials (iron, steel, stainless steel, copper, brass, etc.).Available in many different presentation forms (rods, flux-coated rods, wires, strips, rings, preforms, pastes and powders), these alloys are very free flowing, ductile and strong.High sliver brazing aloys often chosen for its low temperature, good wetting and good flow. Suitable for torch brazing with manual feed, where heating may be inconsistent. For steel, copper and copper alloys, nickel and nickel alloys; for joining ferrous, nonferrous and dissimilar alloys with narrow tolerances.

A general purpose Flux Coated Rod that combines flux and the brazing filler metal into a single form.  It’s ideal for everyday repairs of steel, cast iron and copper metals. Can save labor cost. With highly versatile and strong, it’s widely used for Oxygen/Acetylene Welding/Brazing and can also be used on galvanized iron, brass, stainless, copper and chrome-plated materials, or any combination of them. Provides strong corrosion resistance. This rod can be used to join similar and also dissimilar metals such as mild steel to galvanized steel, stainless steel to copper, mild steel to stainless, stainless to copper nickel and mild steel to cast iron.Welding Material should be heated evenly to brazing temperature, avoid putting direct flame onto flux coating.

Brass brazing alloys can be used for brazing and for the Oxy-Fuel Gas Braze-Welding process, with liquid flux spread through the torch flame.  Brass Brazing Alloys are mainly used for welding among copper, steel and iron.  Most of the common (and easy to use) brazing alloys. It’s a low cost and good physical ability brazing alloy brazing carbon steel, cast iron, hard carbide tools etc.  Brass brazing alloys are widely used in bicycle frame, diamond tools, metal process, marine repair industries.

 The Phosphorus Copper alloys are extensively used to join copper and copper alloy base metals (brass, bronzes). Phos-Copper is extensively used in Non-Ferrous Industry.They have self-fluxing properties when used on copper and may or may not contain Silver.Continuous service operating temperatures of joints brazed with these alloys range up to approx 200℃.Corrosion resistance is satisfactory, except when the joints are exposed to sulfurous environments, especially at elevated temperatures.Phosphorous Copper alloys should not be used on ferrous, nickel based alloys, or copper-nickel alloys with more of 10% nickel, in order to avoid premature failure of the joint due to the formation of brittle intermetallic phases.

The metal alloy material used to fill the weld, surfacing layer and brazing seam during welding is called solder. At present, there are mainly two types of solders: lead-free and lead-containing, and the forms include soldering wire, soldering rod, and solder. There is also semi-liquid solder paste. Lead-tin solder. Mainly tin-lead alloy, and some tin solder also contains a small amount of antimony. A tin alloy containing 37% lead and 63% tin is commonly called solder, with a melting point of about 183°C. This is the most common tin-lead soldering.The difference in the content of tin-lead and the added metal results in the difference in the melting point, thermal expansion coefficient, inherent stress and solidification time of tin-lead solder. Therefore, look at what you need and choose a solder with the right melting point and performance.

 There are many common brazing process methods, which are mainly distinguished by the equipment used and the working principle. If distinguished by heat source, there are infrared, electron beam, laser, plasma, glow discharge brazing, etc.; according to the working process, there are contact reaction brazing and diffusion brazing. Contact reaction brazing utilizes the reaction of the brazing filler metal and the base metal to generate a liquid phase to fill the joint gap. Diffusion brazing is to increase the heat preservation and diffusion time, so that the weld and the base metal are fully homogenized, so as to obtain a joint with the same performance as the base metal. Soldering iron soldering Used for soft soldering of small simple or thin parts. Wave soldering is used for the assembly and soldering of large quantities of printed circuit boards and electronic components. When welding, the molten solder at about 250°C passes through the narrow seam to form a wave crest under the pres

 Welding heating temperature higher than 450 ℃ is called brazing, brazing joints have high strength, and some can work at high temperatures. There are many types of brazing filler metals, with aluminum, silver, copper, manganese and nickel based filler metals being the most widely used. Aluminum-based brazing filler metal is often used for brazing aluminum products. Silver-based and copper-based solders are often used for brazing copper and iron parts. Manganese-based and nickel-based solders are mostly used to weld parts such as stainless steel, heat-resistant steel, and high-temperature alloys that work at high temperatures. For welding refractory metals such as beryllium, titanium and zirconium, as well as materials such as graphite and ceramics, brazing materials such as palladium-based, zirconium-based and titanium-based are commonly used. The characteristics of the base material and the requirements for joint performance should be considered when selecting the brazing filler meta

 The welding heating temperature is lower than 450 ℃ called soft soldering, and soft soldering is mostly used for the welding of conductive, airtight and watertight devices in the electronics and food industries. Tin-lead alloy as the solder is most commonly used. The solder generally needs to use a flux to remove the oxide film and improve the wetting performance of the solder. There are many types of flux, and rosin alcohol solution is used for soft soldering in the electronics industry. The residue after soldering of this kind of flux has no corrosive effect on the workpiece and is called non-corrosive flux. The flux used when welding copper, iron and other materials is composed of zinc chloride, ammonium chloride and petroleum jelly. When welding aluminum, it is necessary to use fluoride and fluoroborate as the flux, and also use hydrochloric acid and zinc chloride as the flux. The residue after welding of these fluxes has a corrosive effect, which is called corrosive flux, which m

A welding method in which a metal material with a lower melting point than the base material is used as the solder, and the liquid solder is used to wet the base material and fill the gap between the workpiece interface and make it diffuse with the base material. The brazing deformation is small, and the joints are smooth and beautiful. It is suitable for welding precise, complex components and components composed of different materials, such as honeycomb structural plates, turbine blades, cemented carbide tools and printed circuit boards. Before brazing, the workpiece must be carefully processed and strictly cleaned to remove oil stains and excessively thick oxide film to ensure the interface assembly gap. The gap is generally required to be between 0.01 and 0.1 mm. According to the different welding temperature, brazing can be divided into two categories. Welding heating temperature lower than 450 ℃ is called soft soldering, higher than 450 ℃ called brazing.