NOCTI WELDING 2025/2026 QUESTIONS AND ANSWERS
GRADED A+
✔✔High Frequency - ✔✔Covers the entire frequency spectrum above 50,000 Hz. Used
in TIG welding for arc ignition and stabilization.
✔✔Hot start - ✔✔Used on some stick (SMAW) machines to make it easier to start
difficult-to-start electrodes. Used for arc starting only
✔✔Hybrid laser-arc welding - ✔✔A combination of laser and arc welding which
produces deep
penetration welds with good tolerance to poor joint fit-up.
✔✔Intermittent Weld - ✔✔Also known as stitch welding, where individual weld
segments are broken up into regularly repeating weld segments rather than a
continuous joint.
✔✔Inverter - ✔✔Power source that increases the frequency of the incoming primary
power, thus providing for a smaller size machine and improved electrical characteristics
for welding, such as
faster response time and more control for pulse welding
✔✔KVA (Kilovolt-amperes) - ✔✔The total volts times amps divided by 1,000, demanded
by a welding
power source from the primary power furnished by the utility company.
✔✔KW (Kilowatts) - ✔✔A measure of power, calculated as volts times amps divided by
1,000.
✔✔Lap joint - ✔✔A joint between two overlapping members in parallel planes.
✔✔Laser beam cutting - ✔✔A process that severs material with the heat from a
concentrated coherent beam impinging upon the work-piece.
✔✔Laser beam welding - ✔✔A process that fuses material with the heat from a
concentrated coherent beam impinging upon the members to be joined.
✔✔Laser cutting - ✔✔A technology that is used for industrial manufacturing applications
and uses a laser to cut materials.
✔✔Laser welding - ✔✔A welding process that offers low heat input and minimum
distortion of welded plates and stiffeners.
✔✔Leg size - ✔✔The leg length is usually designated as the size of the weld.
, ✔✔Lift-Arc - ✔✔This feature allows TIG arc starting without high frequency. Starts the
arc at any amperage without contaminating the weld with tungsten.
✔✔Light Amplification by Stimulated Emission of Radiation (Laser) - ✔✔A device that
provides a concentrated coherent light beam.
✔✔Machining - ✔✔Any of various processes in which a piece of raw material is cut into
a desired final shape and size by a controlled material-removal process
✔✔MIG welding - ✔✔A subtype of GMAW that uses an inert gas or gas mixture for
shielding. Typically used on aluminum and other non-ferrous metals.
✔✔Miter joint - ✔✔A joint made by beveling each of two parts to be joined, usually at a
45° angle, to form a corner, usually a 90° angle
✔✔Open root - ✔✔A weld joint where adjacent pieces to be joined are not touching and
a predefined gap or space is specified. Typically used for high strength joints that
require complete penetration (i.e. the backside of the joint is welded from the front side).
✔✔Pitch - ✔✔The measurement from midpoint to midpoint of intermittent welds (i.e.,
spacing).
✔✔Plasma Arc Welding (PAW) - ✔✔An arc welding process that uses a constricted arc
between a non-consumable electrode and the weld pool (transferred arc) or between
the electrode and the constricting nozzle (non-transferred arc). Shielding is obtained
from the ionized gas issuing from the torch.
✔✔Plasma - ✔✔A gas that has been heated to at least partially ionized condition,
enabling it to conduct an electric current.
✔✔Plasma-Arc Cutting (PAC) - ✔✔An arc cutting process using a constricted arc to
remove the
molten metal with a high-velocity jet of ionized gas from the constricting orifice.
✔✔Power Efficiency - ✔✔How well an electrical machine uses the incoming electrical
power
✔✔Power Factor Correction - ✔✔Normally used on single-phase, constant current
power sources to
reduce the amount of primary amperage while welding.
GRADED A+
✔✔High Frequency - ✔✔Covers the entire frequency spectrum above 50,000 Hz. Used
in TIG welding for arc ignition and stabilization.
✔✔Hot start - ✔✔Used on some stick (SMAW) machines to make it easier to start
difficult-to-start electrodes. Used for arc starting only
✔✔Hybrid laser-arc welding - ✔✔A combination of laser and arc welding which
produces deep
penetration welds with good tolerance to poor joint fit-up.
✔✔Intermittent Weld - ✔✔Also known as stitch welding, where individual weld
segments are broken up into regularly repeating weld segments rather than a
continuous joint.
✔✔Inverter - ✔✔Power source that increases the frequency of the incoming primary
power, thus providing for a smaller size machine and improved electrical characteristics
for welding, such as
faster response time and more control for pulse welding
✔✔KVA (Kilovolt-amperes) - ✔✔The total volts times amps divided by 1,000, demanded
by a welding
power source from the primary power furnished by the utility company.
✔✔KW (Kilowatts) - ✔✔A measure of power, calculated as volts times amps divided by
1,000.
✔✔Lap joint - ✔✔A joint between two overlapping members in parallel planes.
✔✔Laser beam cutting - ✔✔A process that severs material with the heat from a
concentrated coherent beam impinging upon the work-piece.
✔✔Laser beam welding - ✔✔A process that fuses material with the heat from a
concentrated coherent beam impinging upon the members to be joined.
✔✔Laser cutting - ✔✔A technology that is used for industrial manufacturing applications
and uses a laser to cut materials.
✔✔Laser welding - ✔✔A welding process that offers low heat input and minimum
distortion of welded plates and stiffeners.
✔✔Leg size - ✔✔The leg length is usually designated as the size of the weld.
, ✔✔Lift-Arc - ✔✔This feature allows TIG arc starting without high frequency. Starts the
arc at any amperage without contaminating the weld with tungsten.
✔✔Light Amplification by Stimulated Emission of Radiation (Laser) - ✔✔A device that
provides a concentrated coherent light beam.
✔✔Machining - ✔✔Any of various processes in which a piece of raw material is cut into
a desired final shape and size by a controlled material-removal process
✔✔MIG welding - ✔✔A subtype of GMAW that uses an inert gas or gas mixture for
shielding. Typically used on aluminum and other non-ferrous metals.
✔✔Miter joint - ✔✔A joint made by beveling each of two parts to be joined, usually at a
45° angle, to form a corner, usually a 90° angle
✔✔Open root - ✔✔A weld joint where adjacent pieces to be joined are not touching and
a predefined gap or space is specified. Typically used for high strength joints that
require complete penetration (i.e. the backside of the joint is welded from the front side).
✔✔Pitch - ✔✔The measurement from midpoint to midpoint of intermittent welds (i.e.,
spacing).
✔✔Plasma Arc Welding (PAW) - ✔✔An arc welding process that uses a constricted arc
between a non-consumable electrode and the weld pool (transferred arc) or between
the electrode and the constricting nozzle (non-transferred arc). Shielding is obtained
from the ionized gas issuing from the torch.
✔✔Plasma - ✔✔A gas that has been heated to at least partially ionized condition,
enabling it to conduct an electric current.
✔✔Plasma-Arc Cutting (PAC) - ✔✔An arc cutting process using a constricted arc to
remove the
molten metal with a high-velocity jet of ionized gas from the constricting orifice.
✔✔Power Efficiency - ✔✔How well an electrical machine uses the incoming electrical
power
✔✔Power Factor Correction - ✔✔Normally used on single-phase, constant current
power sources to
reduce the amount of primary amperage while welding.
