DEFINITIONS AND TERMS (cont) - TM-750-245-40091

TM 750-245-4

BEAD WELD: A type of weld composed of one or more

BUTT WELD: A weld in a butt joint.

string or weave beads deposited on an unbroken

surface.

BEADING: See string bead and weave bead.

CAPILLARY ATTRACTION: The phenomenon by which

adhesion between the molten filler metal and the base

BEVEL ANGLE: The angle formed between the

metals, together with surface tension of the molten filler

prepared edge of a member and a plane perpendicular

metal, causes distribution of the filler metal between the

to the surface of the member.

properly fitted surfaces of the joint to be brazed.

BLACKSMITH WELDING: See forge welding.

CARBON ARC CUTTING: A process of severing metals

with the heat of a carbon arc.

BLOCK BRAZING: A brazing process in which fusion is

produced by the heat obtained from heated blocks

CARBON ARC WELDING: A welding process in which

applied to the parts to be joined and by a nonferrous

fusion is produced by placing an arc between a carbon

filler metal having a melting point above 800 deg F, but

electrode and the work. Pressure and / or filler metal

below that of the base metal. The filler metal is

and / or shielding may or may not be used.

distributed in the joint by capillary attraction.

CARBON RESIDUE: The carbon deposit left after

BLOCK SEQUENCE: A building up sequence of

subjecting an oil to high temperatures.

continuous multipass welds in which separated lengths

of the weld are completely or partially built up before

CARBURIZING FLAME: An oxy-acetylene 'flame in

intervening lengths and deposited.

See buildup

which there is an excess of acetylene. Also called

sequence.

excess acetylene or reducing flame.

BLOW HOLE: See gas pocket.

CASCADE SEQUENCE: Subsequent beads are stopped

short of a previous bead giving a cascade effect.

BOND: The junction of the welding metal and the base

metal.

CHAIN INTERMITTENT FILLET WELDS: Two lines of

intermittent filler welds in a T or lap joint in which the

BOXING: The operation of continuing a fillet weld

welds in one line are approximately opposite those in

around a corner of a member as an extension of the

the other line.

principal weld.

CHAMFERING: The preparation of a contour, other than

BRAZE WELDING: A method of welding in which a

for a square groove weld for welding on the edge of a

groove, fillet, plug or slot weld is made by using a

member.

nonferrous fillet metal having a melting point below that

of the base metals but above 800 deg F. The filler

CLEANING MATERIAL: Clean, white, lint-free cloth or

metal is not distributed in the joint by capillary attraction.

tissue used with approved solvents to clean soldered

joints.

BRAZING: A group of welding processes in which fusion

is produced by heating to a suitable temperature above

CLEANING

SOLVENTS:

Tetrachloroethylene,

800 deg F, and by using a nonferrous filler metal having

Perchloroethylene, Trichloroethane and Isopropy

a melting point below that of the base metals. Filler

Alcohol are the approved cleaning solvents for cleaning

metal is distributed between the closely fitted surfaces

solder connections.

of the joint by capillary attraction.

COATED ELECTRODE: An electrode having a flux

BRIDGING: A welding defect caused by poor

applied externally by dipping, spraying, painting or other

penetration. A void at the root of the weld is spanned by

similar methods. Upon burning the coat produces a gas

weld metal.

around the arc.

BUCKLING: Distortion caused by the heat of a welding

COLD SOLDER JOINT: A cold solder joint is the result

process.

of insufficient heat to enable the solder to flow. Quite

recognizable, this joint has a piled up, rough surface,

BUILDUP SEQUENCE: The order in which the weld

chalky, without metallic luster.

beads of a multipass weld are deposited with respect to

the cross section of a joint. See block sequence.

COMMUTATORY CONTROLLED WELDING: The

making of a number of spot or projection welds in which

BUTT JOINT: A joint between two base metals in such a

several electrodes, in simultaneous contact with the

manner that the weld joining the parts is between the

work, progressively function under the control of an

surface planes of both the parts joined.

electrical commutating device.

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