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By Robert L. O'Brien

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Extra resources for Jefferson's Welding Encyclopedia, 18th Edition

Example text

The electrode coating is formulated to react exothermically, concentrating the heat and force of the arc at the point of cut. They are designed to have a slow burn-off rate, so that maximum length of cut can be achieved with each electrode. They are capable of withstanding a higher range of cutting amperages. Oxygenless arc cutting is not limited to Welding Encyclopedia ferrous metals, since it does not depend on the heat generated by the oxidation of the iron to propagate the process. Application technique is a factor to be considered when specifying electric arc cutting.

The electrodes must be of sufficient diameter to carry the required welding currents without undue heating. ) diameter electrode is suitable for currents up to 35 000 amp. and a welding time of 15 cycles, when the rate of welding is not more than 40 welds per minute. ) diameter should be used. ) diameter electrodes are satisfactory. A coating of aluminum alloy gradually forms over the face of the electrode. This alloy "pickup" is of low electrical conductivity, and eventually causes the electrodes to stick to the work and to melt the surface of the base material.

The metal recrystallizes to a very fine grained structure having the properties of moderately cold-worked metal. The magnitude of the factors required to produce a weld are functions of the thickness, surface condition, and the mechanical properties of the workpieces. See ULTRASONIC WELDING. ]) between two welding members or sonotrodes, and the vibratory energy is introduced for a brief interval. The heart of the equipment is a magnetostrictive transducer, a rectangular stack built up of “A” nickel laminations wrapped with insulated wire.

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