• INDUCTION SOLDERING (IS)

    A soldering process in which the heat required is obtained from the resistance of the workpieces to induced electric current. 

  • INDUCTION UPSET WELDING (UW-I)

    An upset welding process variation in which high-frequency welding current is induced in the work-pieces. See Figure 1-7. See also HIGH FREQUENCY RESISTANCE WELDING and UPSET WELDING. 

  • INDUCTION WORK COIL

    The inductor used when welding, brazing, or soldering with induction heating equipment. See Figure 1-7. 

  • INDUSTRIAL WELDING MACHINES

    Arc welding machines with a 60% or higher duty cycle generally used for industrial production. They can be transformer, motor-drive, engine-drive or solid state machines. They may be either ac, dc or a combination of both. 

  • INERT GAS

    A gas that does not normally combine chemically with materials. See PROTECTIVE ATMOSPHERE.

    Inert gases such as argon or helium may be used as shielding gases in welding operations because they will not react with the materials being welded and they prevent atmospheric contamination of the puddle and the electrode.

    Nitrogen is sometimes considered to be an inert gas; however, under certain conditions it will react to produce nitrides, which are undesirable. See ARGON, HELIUM, GAS METAL ARC WELDING, and GAS TUNGSTEN ARC WELDING. 

  • INERT GAS CARBON ARC WELDING

    An obsolete, rarely-used arc welding process in which joining is produced by heating with an electric arc between a carbon electrode and the work. Shielding is obtained from an inert gas, such as helium or argon. Pressure and filler metal may or may not be used. 

  • INERT GAS METAL ARC WELDING

    A nonstandard term for GAS METAL ARC WELDING (GMAW). See GAS METAL ARC WELDING.

    The GMAW process is popularly called MZG (metal inert gas); also C02welding. The terms MZG and C02 welding are in general use in the industry, although for technical reasons they are not listed among the standard terms of the American Welding Society. 

  • INERT GAS SHIELDED ARC WELDING

    A nonstandard term for GAS TUNGSTEN ARC WELDING (GTAW).

    The GTAW process is popularly called TZG; this term is in general use in the welding industry, although for technical reasons it is not listed as a standard term by the American Welding Society. See GAS TUNGSTEN ARC WELDING. 

  • INERT GAS TUNGSTEN ARC WELDING

    A nonstandard term for GAS TUNGSTEN ARC WELDING (GTAW). See GAS TUNGSTEN ARC WELDING. 

  • INERTIA FRICTION WELDING

    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 Figure 1-8. 

  • INFRARED BRAZING (IRB)

    A brazing process that uses heat from infrared radiation. 

  • INFRARED RADIATION

    Electromagnetic energy with wave lengths from 770 to 12000 nanometers. 

  • INFRARED RAYS

    Part of the light spectrum produced by arc welding, which can have harmful effects on the eyes. See EYE PROTECTION. 

  • INFRARED SOLDERING (IRS)

    A soldering process in which the heat required is furnished by infrared radiation.

     

  • INFRARED WELDING, Plastics

    Heating by infrared lamps has been developed as a method for heating large polymeric structures. In infrared welding, infrared lamps scan the joining surface to melt the polymer. When a suitable temperature is reached, as controlled by sensors, the infrared lamps are withdrawn and the parts are joined or pressed together. 

  • INGOT IRON

    An open hearth iron very low in manganese, carbon and other impurities. 

  • INITIAL CURRENT

    The current after starting the arc but before establishment of welding current. 

  • INNER CONE

    The brilliant, short part of an oxyacetylene flame immediately adjacent to the orifice of the torch tip.

  • INTERGRANULAR PENETRATION

    The penetration of a filler metal along the grain boundaries of a base metal. 

  • INTERMEDIATE FLUX

    A soldering flux with a residue that generally does not attack the base metal. The original composition may be corrosive.

  • INTERMllTENT WELD

    A weld in which the continuity is broken by recurring unwelded spaces.

    Chain Intermittent Fillet Welds

    Two lines of intermittent fillet welding in a T- or lap joint, in which the increments of welding in one line are approximately opposite to those in the other line.

    Staggered Intermittent Fillet Welds

    Two lines of intermittent fillet welding in a T- or lap joint, in which the increments of welding in one line are staggered with respect to those in the other line. See also SKIP WELDING.

  • INTERNATIONAL ACETYLENE ASSOCIATION

    An organization of manufacturers and users of acetylene and oxygen, and equipment using these gases, which was formed in 1898and disbanded in 1963. The Compressed Gas Association assumed the activities of this organization. 

  • INTERPASS TEMPERATURE, Thermal Spraying

    In multipass thermal spraying, the temperature of the thermal spray area between thermal spray passes. 

  • INTERPASS TEMPERATURE, Welding

    In a multipass weld, the temperature of the weld between weld passes. 

  • INTERPULSE TIME, Resistance Welding

    The time between successive pulses of current within the same impulse.

    See Figure H-3.