DEFINITIONS AND TERMS (cont) - TM-750-245-40094

TM 750-245-4

filler metal has been added. The filler metal is not

GROOVE: The opening provided between two members

distributed in the joint by capillary attraction.

to be joined by a groove weld.

FLUX: A cleaning agent used to dissolve oxides, release

GROOVE ANGLE: The total included angle of the

trapped gases and slag and to cleanse metals for

groove between parts to be joined by a groove weld.

welding, soldering and brazing.

GROOVE FACE: That surface of a member included in

FOREHAND WELDING: A gas welding technique in

the groove.

which the flame is directed against the base metal

ahead of the completed weld.

GROOVE RADIUS: The radius of a JF or UF groove.

FORGE WELDING: A group of welding processes in

GROOVE WELD: A weld made by depositing filler

which fusion is produced by heating in a forge or

metal in a groove between two members to be joined.

furnace and by applying pressure or blows.

GROUND CONNECTION: The connection of the work

FREE BEND TEST: A method of testing weld

lead to the work.

specimens without the use of a guide.

GROUND LEAD: See work lead.

FRETTING CORROSION: Corrosion caused by

GUIDED BEND TEST: A bending test in which the test

vibration, high pressure, and oxidation. This results

specimen is bent to a definite shape by means of a jig.

when parts hold a load for a considerable period without

moving.

FRACTURED SOLDER JOINT: This is the result of

allowing soldered components to move, while the solder

HAMMER WELDING: A forge welding process.

is in a plastic state. Looks similar to a cold solder joint,

however, close examination will show fatigue-like cracks

HAND SHIELD: A device used in arc welding to protect

90 degrees to direction of movement.

the face and neck. It is equipped with a filter glass lens

and is designed to be held by hand.

FULL FILLET WELD: A fillet weld whose size is equal to

the thickness of the thinner member joined.

HARD SURFACING: The application of a hard, wear

resistant alloy to the surface of a softer metal.

FURNACE BRAZING: A process in which fusion is

produced by the furnace heat and a nonferrous filler

HEAT AFFECTED ZONE: That portion of the base

metal having a melting point above 800 deg F, but

metal whose structure or properties have been changed

below that of the base metals. The filler metal is

by the heat of welding or cutting.

distributed in the joint by capillary attraction.

HEAT TIME: The duration of each current impulse in

FUSION: A thorough and complete mixing between the

pulsation welding.

two edges of the base metal to be joined or between the

base metal and the filler metal added during welding.

HEATING GATE: The opening in a thermal mold

through which the parts to be welded are preheated.

FUSION ZONE (FILLER PENETRATION): The area of

base metal melted as determined on the cross section

HELMET: A device used in arc welding to protect the

of a weld.

face and neck. It is equipped with a filter glass and is

designed to be worn on the head.

GAS POCKET: A weld cavity caused by the trapping of

HOLDER SOLDERING IRON: A cage-like device to

gases released by the metal when cooling.

dissipate heat from a soldering iron when not in actual

use for soldering operations. The holder prevents

GAS WELDING: A process in which the welding heat is

overheating of soldering irons, thus preventing buildup

obtained from a gas flame.

of oxides on the tips. This extends the life of the tip and

provides easier soldering iron maintenance.

GOGGLES: A device with colored lenses which protect

the eyes from harmful radiation during welding and

HOLD TIME: The time that pressure is maintained at the

cutting operations.

electrodes after the welding current has stopped.

GRAVITY: Weight per volume. The petroleum industry

HORIZONTAL WELD: A bead or butt welding process

uses the specific gravity or the API scales "Gravity is of

with its linear direction horizontal or inclined at an

little significance as an index of the quality of oil."

B-8