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100
gas marks
A condition that can occur in gas shielded flux cored welding in which a gas bubble evolved from the arc does not escape through the molten slag and becomes trapped in the molten weld puddle. The slag then solidifies and the trapped gas bubble marks the weld bead. It appears as a divot or pock mark and is a visual defect and can lead to physical defects. Also called worm tracking.
100
gas metal arc welding – spray arc
A gas metal arc welding process variation in which the consumable electrode is propelled axially across the arc in small droplets.
100
hand shield
A protective device, used in arc welding, for shielding the eyes, face, and neck. A hand shield is equipped with a filter plate and is designed to be held by the hand.
100
impact strength
The ability of a metal to withstand a sharp high-velocity blow without fracturing. It is usually measured in foot-lbs., which is a unit of energy or work, and is measured at different temperature gradients.
100
lamellar tear
A terrace-like fracture in the base metal with a basic orientation parallel to the wrought surface. It is caused by high stress in the thickness direction that results from welding.
200
gas metal arc welding
(GMAW) An arc welding process that produces coalescence of metals by heating them with an arc between a continuous filler metal electrode and the workpieces. Shielding is obtained entirely from an externally supplied gas.
200
gas pocket
A non-standard term for porosity or holes in the weld.
200
hardfacing
A surfacing variation in which surfacing metal is deposited to reduce wear.
200
impedance
In electricity, the slowing down of current flowing in a circuit. It is the resistance in alternating current (AC), and is brought about by the building and collapsing field of AC.
200
lap joint
A joint between two overlapping members in parallel planes.
300
gas metal arc welding – globular arc
(GMAW-G) A gas metal arc welding process variation in which the molten metal transfer is in large drops across the arc. Generally, this is a violent metal transfer with a considerable amount of spatter.
300
gas regulator
A device for controlling the delivery of gas at some substantially constant pressure.
300
horizontal position (fillet weld)
The position in which welding is performed on the upper side of an approximately horizontal surface and against an approximately vertical surface.
300
included angle
A non-standard term for groove angle.
300
lead angle
A non-standard term for travel angle.
400
gas metal arc welding - pulsed arc
(GMAW-P) A gas metal arc welding process variation in which the welding current is pulsed between two current levels: a peak current and a background current rather than one consistent current level.
400
gas shielded arc welding
A general term used to describe GMAW, GTAW, and FCAW when gas shielding is employed.
400
horizontal position (groove weld)
The position of welding in which the weld axis lies in an approximately horizontal plane and the weld face lies in an approximately vertical plane.
400
interpass temperature –
In a multi-pass weld, the temperature of the weld metal before the next pass is started.
400
load voltage
The voltage that is measured across the output terminals while under load (while someone is welding). It includes the arc voltage plus any voltage drop that occurs along the length of the cables.
500
gas metal arc welding – short circuit arc
A gas metal arc welding process variation in which the consumable electrode is deposited during repeated short circuits. When a short circuit is produced, voltage goes to zero and amperage accelerates at a fast pace. Weld metal is deposited when the current reaches a high enough level to “break-off” a ball of wire.
500
gas tungsten arc welding
(GTAW) An arc welding process that produces coalescence of metals by heating them with an arc between a tungsten electrode (non-consumable) and the workpieces. Shielding is obtained from a gas. Pressure may or may not be used, and filler metal may or may not be used.
500
horizontal rolled position (pipe welding)
The position of a pipe joint in which the axis of the pipe is approximately horizontal, and welding is performed in the flat position by rotating the pipe.
500
inverter
A power supply that elevates the incoming AC frequency from 50 Hz or 60 Hz to ranges such as 20,000 Hz. By doing this, the machine is more efficient, smaller in size, and has a smoother DC welding arc. Adjusting the output characteristics (waveforms) is also possible with an inverter, therefore, improving the arc characteristics
500
longitudinal crack
A crack with its major axis orientation approximately parallel to the weld axis.