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Solid Materials: Joining Processes
Published in Leo Alting, Geoffrey Boothroyd, Manufacturing Engineering Processes, 2020
Salt bath brazing, where the preloaded and fastened assemblies are dipped into molten salt kept at a temperature slightly above the melting point of the brazing metal, is used primarily for larger components and where very thin or very thick sections are brazed. Induction brazing, where high-frequency induction currents heat the preloaded assemblies, is a fast production method that lends itself to some automation. It is widely used in industry, especially for assemblies with a good surface finish. Resistance brazing is mainly used in the electrical industry to braze conductors, connections, and so on, and the heat is supplied through electrodes of graphite. Metal bath or dip brazing, where the assemblies are dipped in a molten bath of the brazing metal, is used principally for small components, typically for the fastening of wires in the electrical industry. In soldering, the metal bath or dip heating is used extensively, and the application of induction heating is increasing. Much soldering is done with electrical soldering irons, which is a versatile and cheap method.
Joining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
In induction brazing, the components to be brazed are heated by placing them in an alternating magnetic field that, in turn, induces an alternating current in the components that rapidly reverses its direction. Special coils made of copper, referred to as inductors, are employed for generating the magnetic field. The filler metal is often placed in the joint area before brazing but can also be hand-fed by the operator. This technique has a clear advantage, which is the possibility of obtaining a very closely controlled heating area.
Laser power effects on properties of laser brazing diamond coating
Published in Surface Engineering, 2020
Weimin Long, Dashuang Liu, Xian Dong, Aiping Wu
In recent years, the methods for manufacturing single-layer diamond tools have received much attention. The main methods are brazing in a vacuum furnace and induction heating brazing [4–7]. However, both methods have their own shortcomings. Brazing in a vacuum furnace has a lower production efficiency, and the diamond grits will be exposed to high temperature for a long time, which will cause severe thermal damage to the diamond grits and affect their quality. The limitations of high-frequency induction brazing are mainly the complicated design and manufacture of the coil and the heating range is affected by the shape of the coil [8,9]. Since the laser beam energy with its inherently higher efficiency makes the extent of thermal damage of the diamond grits, and the thermal deformation of the substrate during the laser brazing process better controlled, this method of selecting laser beam for brazing can not only solve the deficiencies in the above two processes, but also obtain a machining tool with good grinding performance [10,11].
Laser technique in diaphragm cum rupture disc for defence oriented silver oxide zinc reserve batteries
Published in Materials and Manufacturing Processes, 2019
Venugopal Devasenapathy, G A Pathanjali, Natarajan Srinivasan
The reasons to choose fiber lasers for selecting these parameters were: high beam quality, high peak power and long pulse durations that were considered good for high speed scoring, engraving and micro machining applications. Figure 5 indicates uniform depth of scoring mark that was measured by WLI.[23] The reason for selecting induction brazing was that heating occurred without physical contact through transfer of energy from the inductor to the sample and got heated by means of electromagnetic fields.[24,25] Due to this, silver diaphragm material structure, subjected to laser exposure was not affected and condition of the component remained the same.
Influence of solder and flux composition on thermal stability of brazed PDC cutters
Published in Welding International, 2021
I. N. Pashkov, V. E. Misnikov, V. A. Morozov, M. Gadzhiev, T. A. Bazlova
Oil and gas wells are drilled in soft, medium and hard rock using drilling bits, cutters, inserts and other types of tools, equipped with cutting elements in the form of diamond/hard alloy cutters (DHAC). The cutter consists of a plate of polycrystalline diamond and a hard-alloy substrate. The cutter is joined to the body of the bit or cutter by brazing, most often induction brazing. The hard-alloy substrate is brazed to a steel body.