Z94.12.7 Welding

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PASS. A single longitudinal progression of a welding operation along a joint or weld deposit. The result of a pass is a weld bead.

PERCUSSION WELDING. A resistance-welding process wherein coalescence is produced simultaneously over the entire abutting surfaces by the heat obtained from an arc produced by a rapid discharge of electrical energy with pressure percussively applied during or immediately following the electrical discharge.

PLASMA ARC-WELDING. An arc-welding process wherein coalescence is produced by heating with a constructed arc between an electrode and the work piece (transferred arc) or the electrode and the constricting nozzle (non-transferred arc). Shielding is obtained from the hot, ionized gas issuing from the orifice which may be supplemented by an auxiliary source of shielding gas. Shielding gas may be an inert gas or a mixture of gases. Pressure may or may not be used, and filler metal may or may not be supplied.

PLATEN. A member with a substantially flat surface to which dies, fixtures, backups, or electrode holders are attached, and which transmits the electrode force or upsetting force in a resistance-welding machine.

PLATEN FORCE. The force available at the movable platen to cause upsetting in flash or upset welding. This force may be dynamic, theoretical, or static.

PLUG WELD. A circular weld made through a hole in one member of a lap or tee joint joining that member to the other. The walls of the hole may or may not be parallel and the hole may be partially or completely filled with weld metal. (A fillet-welded hole or a spot weld should not be construed as conforming to this definition.)

POROSITY. Gas pockets or voids in metal.

POSTHEAT CURRENT. The current through the welding circuit during postheat time in resistance welding.

POSTHEATING. The application of heat to an assembly after welding, brazing, soldering, or cutting operations.

PREHEATING. The application of heat to the base metal immediately before welding, brazing, soldering, or cutting.

PREHEAT TEMPERATURE. The temperature specified that the base metal must attain in the welding, brazing, soldering, or cutting area immediately before these operations are performed.

PRESSURE GAS WELDING. Gas-welding process wherein coalescence is produced, simultaneously, over the entire area of abutting surfaces, by heating with gas flames obtained from the combustion of a fuel gas with oxygen and by the application of pressure, without the use of filler metal.

PROCEDURE QUALIFICATION. The demonstration that welds made by a specific procedure can meet prescribed standards.

PROJECTION WELDING. A resistance-welding process wherein coalescence is produced by the heat obtained from resistance to electric current through the work parts held together under pressure by electrodes. The resulting welds are localized at predetermined points, by projections, embossments, or intersections.

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