Z94.12.7 Welding

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EDGE JOINT. A joint between the edges of two or more parallel or nearly parallel members.

EDGE PREPARATION. The contour prepared on the edge of a member of welding.

ELECTRODE HOLDER. A device used for mechanically holding the electrode and conducting current to it.

ELECTRON BEAM WELDING. A welding process wherein coalescence is produced by the heat obtained from a concentrated beam composed primarily of high velocity electrons impinging upon the surfaces to be joined.

ELECTRONIC HEAT CONTROL. A device for adjusting the heating value (rms value) of the current in making a resistance weld by controlling the ignition or firing of the tubes in an electronic contractor. The current is initiated each half-cycle at an adjustable time with respect to the zero point on the voltage wave.

ELECTROSLAG WELDING. A welding process wherein coalescence is produced by molten slag which melts the filler metal and the surfaces of the work to be welded. The weld pool is shielded by this slag which moves along the full cross section of the joint as welding progresses. The conductive slag is maintained molten by its resistance to electric current passing between the electrode and the work.

EXPLOSIVE WELDING. A process where an explosive material, usually in the form of a sheet, is placed on the top of two layers of metal and detonated progressively. A compressive stress wave, on the order of thousands of megapascals, progresses across the surface of the plates, so that a small open angle is formed between the two colliding surfaces. Surface films are liquefied or scarfed off the surfaces and jetted out of the interface, leaving clean surfaces which coalesce under the high pressure. The result is a cold weld having a wavy configuration at the interface. The progress is used primarily for bonding sheets of corrosion resistant metals to heavier plates of base metals (cladding).

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