"' Induction brazing "'is a process in which two or more materials are joined together by a filler metal that has a lower melting point than the base materials using induction heating.
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Similar to torch welding, GTAW normally requires two hands, since most applications require that the welder manually feed a filler metal into the weld area with one hand while manipulating the welding torch in the other.
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It provides mechanical properties, heat treatment, heat and product chemical composition and analysis, test specimens, and methodologies of testing for welding rods, filler metals and electrodes used in the construction of pressure vessels.
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In most cases, the filler metal in the form of a rod is added to the weld pool manually, but some applications call for an automatically fed filler metal, which often is stored on spools or coils.
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In most cases, the filler metal in the form of a rod is added to the weld pool manually, but some applications call for an automatically fed filler metal, which often is stored on spools or coils.
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The impurities can be removed by mechanical cleaning or by chemical means, but the elevated temperatures required to melt the filler metal ( the solder ) encourages the work piece ( and the solder ) to re-oxidize.
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Soft soldering is characterized by having a melting point of the filler metal below approximately, whereas silver soldering and brazing use higher temperatures, typically requiring a flame or carbon arc torch to achieve the melting of the filler.
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For successful soldering and brazing, the oxide layer has to be removed from both the surfaces of the materials and the surface of the filler metal preform; the exposed surfaces also have to be protected against oxidation during heating.
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The weld area is protected from atmospheric contamination by a shielding gas ( usually an inert gas such as argon ), and a filler metal is normally used, though some welds, known as autogenous welds, do not require it.
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In the cases of soldering direct to glasses and ceramics, ultrasonic soldering filler metals need to be modified with active elements such as In, Ti, Hf, Zr and rare earth elements ( Ce, La, and Lu ).
