Brazing is an economical method for making strong, permanent metal joints. Compared with welding, brazing requires relatively low temperatures, is readily automated, and can join dissimilar metals. Brazing filler materials come in a wide range of compositions, shapes, and sizes to suit most applications. There are a number of options when it comes to joining metal parts, including adhesive bonding, nuts and bolts, and many other types of mechanical fasteners. But for strong and permanent metal joints, the choice usually comes down to either welding or brazing. Welding joins metals by melting and fusing them, usually adding a filler material. Fusion requires concentrated heat directly at the joint, and temperatures must exceed the melting point of the metals and filler. Welded joints are usually as strong or stronger than the base materials. Brazing differs from welding in that the temperature is considerably lower and does not melt the base metals. Rather, the heat source melts a filler metal and draws it into the joint by capillary action. It creates a metallurgical bond between the filler metal and part surfaces. Like welding, joint strength often exceeds that of the individual parts. For instance, the tensile strength of stainlesssteeljoints can exceed 130,000 psi. But because brazing temperatures are lower, generally 1,150 to 1,600°F, most physical properties remain unaffected. Distortion and warping are minimal, and it minimizes stresses in the joint area. Lower temperatures also
Products & Services
Welding alloys are used to melt and fuse pieces of metal together.
Solders include low melting point metal alloys usually in wire, powder, preform or paste forms. Solders are metal alloys with low melting points that are used to join metals together.
Plastic welders consist of torches, ultrasonic welding equipment, heat guns, hot rod welders, RF or dielectric welders, and hot plate welders used to join thermoplastic materials.
Braze and Brazing Alloys
Braze and brazing alloys join metals or other materials without extensive fusion of the substrates. Brazes have a higher melting point (>800° F) than solders and cause little or no metal vaporization, gain growth, stress corrosion, or distortion.
Topics of Interest
34.1 Introduction and Cross-Reference
Soldering and brazing are useful, fairly simple joining processes in which metals are wetted and joined together by a dissimilar metal of lower melting...
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A. Soldering and Brazing
Soldering and brazing are closely related methods for joining separate components. In both cases, a filler metal that melts at a lower temperature than the melting or...
Brazing joins parts by heating them to more than 840°F and applying a filler metal that has a melting temperature below that of the base metal. Filler metal flows into the joint by capillary...
Soldering and brazing are important industrial methods of bonding metals, and are especially widely used in connection with mass production. They have their given applications in...