QG-109
QG-109.2 DEFINITIONS:-
brazing: a group of metal joining processes which produces coalescence of materials by heating them to a suitable temperature, and by using a filler metal having a liquidus above 840°F (450°C) and below the solidus of the base materials. The filler metal is distributed between the closely fitted surfaces of the joint by capillary action.
brazing operator: one who operates machine or automatic brazing equipment.
brazing temperature: the temperature to which the base metal(s) is heated to enable the filler metal to wet the base metal(s) and form a brazed joint.
brazing temperature range: the temperature range within which brazing can be conducted.
brazing, automatic: brazing with equipment which performs the brazing operation without constant observation and adjustment by a brazing operator. The equipment may or may not perform the loading and unloading of the work.
brazing, block (BB): a brazing process that uses heat from heated blocks applied to the joint. This is an obsolete or seldom used process.
brazing, dip (DB): a brazing process in which the heat required is furnished by a molten chemical or metal bath. When a molten chemical bath is used, the bath may act as a flux; when a molten metal bath is used, the bath provides the filler metal.
brazing, furnace (FB): a brazing process in which the workpieces are placed in a furnace and heated to the brazing temperature.
brazing, induction (IB): a brazing process that uses heat from the resistance of the workpieces to induced electric current.
brazing, machine: brazing with equipment which performs the brazing operation under the constant observation and control of a brazing operator. The equipment may or may not perform the loading and unloading of the work.
brazing, manual: a brazing operation performed and controlled completely by hand. See also automatic brazing and machine brazing.
brazing, resistance (RB): a brazing process that uses heat from the resistance to electric current flow in a circuit of which the workpieces are a part.
brazing, semiautomatic: brazing with equipment which controls only the brazing filler metal feed. The advance of the brazing is manually controlled.
brazing, torch (TB): a brazing process that uses heat from fuel gas flame.
build‐up of base metal/restoration of base metal thickness: this is the application of a weld material to a base metal so as to restore the design thickness and/or structural integrity. This build‐up may be with a chemistry different from the base metal chemistry which has been qualified via a standard butt welded test coupon. Also, may be called base metal repair or buildup.
butt joint: a joint between two members aligned approximately in the same plane.
butt-fusing cycle: pressure–time diagram for a defined fusing temperature, representing the entire butt-fusing operation.
butt-fusing pressure: the sum of the theoretical butt-fusing pressure plus the drag pressure. This is the gauge pressure used by the butt-fusing operator on the butt-fusing machine to join the pipe ends.
buttering: the addition of material, by welding, on one or both faces of a joint, prior to the preparation of the joint for final welding, for the purpose of providing a suitable transition weld deposit for the subsequent completion of the joint.
clad brazing sheet: a metal sheet on which one or both sides are clad with brazing filler metal.
coalescence: the growing together or growth into one body of the materials being joined.
complete fusion: fusion which has occurred over the entire base material surfaces intended for welding, and between all layers and beads.
composite: a material consisting of two or more discrete materials with each material retaining its physical identity.
consumable insert: filler metal that is placed at the joint root before welding, and is intended to be completely fused into the root to become part of the weld.
contact tube: a device which transfers current to a continuous electrode.
control method (FSW): the manner of monitoring and controlling the position of the rotating tool with respect to the weld joint during the friction stir welding process.
control method, force (FSW): a control method that uses a force set point, such as plunge force or travel force, to control the tool position. Under the force control method, the plunge depth or travel speed can vary, within a specified range, during welding.
control method, position (FSW): a control method that uses a set plunge position relative to the plate surface to control the tool position. Under the position control method, the plunge force can vary, within a specified range, during welding.
control method, travel (FSW): a control method that uses a set travel speed to control the tool position. Under the travel control method, the travel force can vary, within a specified range, during welding.
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