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Inert gas. A gas that does not react chemically with materials. See also protective atmosphere. Inertia Friction Welding (FRW-I). A variation of friction welding in which the energy required to make the weld is supplied primarily by the stored rotational kinetic energy of the welding machine. See also direct drive friction welding. Infrared Brazing (IRB). A brazing process using heat from infrared radiation. Infrared Soldering (IRS). A soldering process in which the heat required is furnished by infrared ra-diation. Infrared radiation. Electromagnetic energy with wave lengths from 770 nanometers to 12,000 nanometers [7,700 Å to 120,000 Å]. Insulating nozzle. A device at the exit end of the welding gun protecting the contact tip from spatter and possibly increasing the electrode extension while maintaining a shorter stick-out (self-shielded flux cored arc welding). Intermediate flux. A soldering flux with a residue that generally does not attack the base metal. The original composition may be corrosive. Intermediate weld pass. A single progression of welding along a joint subsequent to the root pass(es) and prior to the cover pass(es). Intermediate weld bead. A weld bead resulting from an intermediate weld pass. Intermittent weld. A weld in which continuity is interrupted by recurring unwelded spaces. Interpass temperature. In multipass thermal spraying, the temperature of the thermal spray area between thermal spray passes (thermal spraying). In a multipass weld, the temperature of the weld area between weld passes (welding). Iron Soldering (INS). A soldering process obtained from a soldering iron. J Joining. Any process used for connecting materials. Joint. The junction of the workpiece(s) that are to be joined or have been joined. Joint type. A weld joint classification based on the relative orienta-