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An Experimental Study of Mechanical and Microstructural Properties of AA7075-T6 by Using UWFSW Process
Published in Chander Prakash, Sunpreet Singh, J. Paulo Davim, Characterization, Testing, Measurement, and Metrology, 2020
Akash Sharma, V.K. Dwivedi, Shahabuddin
Forged welding is an ancient welding process used by blacksmith to join two pieces by repeated hammering of the two pieces in red-hot condition. Thermit welding is suitable for remote places and bigger components where gas and electricity are not available. Gas welding is suitable for joining thin plates. Electric arc welding is the most common popular method for welding. Resistance welding is most commonly used to join thin sheets, e.g., welding of automobile bodies. Friction stir welding (FSW) is a process to join two similar or dissimilar metals by the rotating tool in which process utilized heat generated by the rotating tool as well as plastic deformation. In FSW, work pieces being welded were rigidly clamped together on the special design fixture, and a cylindrical tool having shoulder and pin is rotated with suitable speed and plunges inside two pieces until the shoulder make a contact with the surface of the base metal (BM). Friction heat is generated by rotating tool between work piece and rotating tool as shown in Figure 10.1.
Joining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
Thermit welding makes use of an exothermic chemical reaction to supply heat energy. That reaction involves the burning of thermit, which is a mixture of fine aluminum powder and iron oxide in the form of rolling-mill scale, mixed at a ratio of about 1 to 3 by weight. Although a temperature of 5400°F (3000°C) may be attained as a result of the reaction, localized heating of the thermit mixture up to at least 2400°F (1300°C) is essential in order to start the reaction, which can be given by the following chemical formula. 8Al+3Fe3O4→9Fe+4Al2O3+heat
Power Connectors
Published in Paul G. Slade, Electrical Contacts, 2017
Thermite welding is a fusion welding process in which two metals become bonded over being heated by superheated metal that undergoes an aluminotermic reaction. The liquid metal resulting from the reaction between a metal oxide and aluminum acts as the filler metal and hangs around the conductors thus making a molecular weld. Thermite welding is extensively used for making grounding connections between copper conductors. The advantages of this process are excellent current-carrying capacity equal to or greater than that of the conductor, high stability during repeated short-circuit current pulses and excellent corrosion resistance and mechanical strength. Advantages and disadvantages of exothermic (termite) connections are presented in Table. 5.27. Figure 5.94 show typical crucible-mold setup for welding copper conductors.
The Origins of Blast-Loaded Vessels
Published in Nuclear Technology, 2021
The three companies were the General Engineering and Foundry Company headquartered in Pittsburgh, Pennsylvania with a suitable foundry located in Newcastle, Indiana; the Bethlehem Steel Corporation, located in Bethlehem, Pennsylvania; and Jones and Laughlin headquartered in Pittsburgh, Pennsylvania, with a suitable foundry located in Cleveland, Ohio. Team members met with representatives from all three companies and left the meetings with optimism about building the cast-steel vessel. The team dropped Jones and Laughlin from consideration because their representatives were vague on the exact method they would employ to fabricate the vessel. The General Engineering and Foundry Company and Bethlehem Steel Corporation both recommended tapered cast hemispherical shells joined by a heavy circumferential thermite weld around the equator. Thermite welding is a process that uses a powerful exothermic chemical reaction between iron oxide and aluminum powders to create a weld between two components.