Chap 30-31

Question 1

Nonconsumable electrode arc welding process in which a tungsten electrode is used, the filler metal is supplied from a filler wire, and flux is not used

Answer 1

gas tungsten arc welding

Question 2

Consumable electrode arc welding process in which an electric arc is generated by touching the tip of a coated electrode against the workpiece and withdrawing it quickly to a distance sufficient to maintain the arc; the end of the electrode and its coating melt in this process and the melted electrode coating deoxidizes the weld area and provides a shielding gas to protect it from oxygen and the environment

Answer 2

shielded metal arc welding

Question 3

Consumable electrode arc welding process in which the weld arc is shielded by a granular flux that is fed into the weld zone from a hopper by gravity flow through a nozzle; the thick layer of flux completely covers the molten metal, preventing spatter and sparks, and acting as a thermal insulator that promotes deep penetration of heat into the workpiece

Answer 3

submerged arc welding

Question 4

Consumable electrode arc welding process in which shielded gas is supplied through electrode

Answer 4

gas metal arc welding

Question 5

Consumable electrode arc welding process where the electrode is tubular in shape and is filled with flux

Answer 5

flux cored arc welding

Question 6

Welding process in which heat is generated by high-velocity, narrow-beam electrons; the kinetic energy of the electrons in converted into heat as they strike the workpiece; the process requires special equipment to focus the electrons, typically in a vacuum; the sizes of the welds are much smaller than those produced by conventional (oxyfuel gas or arc) welding processes

Answer 6

electron beam welding

Question 7

Process that utilizes a high-power laser beam as the source of heat to produce a weld; it does not require a vacuum

Answer 7

laser beam welding

Question 8

Type of discontinuity in a welded joint in which undesirable compounds such as oxides, fluxes, and/or electrode coating materials are trapped in the weld zone

Answer 8

inclusions

Question 9

General term for a family of joining processes in which parts are combined via diffusion, pressure, and/or relative interfacial movements; the combining of parts is accomplished without melting the parts at the interface where they are to be joined and without the use of a filler material; no liquid or molten phase is present at the joint

Answer 9

solid state welding

Question 10

cold welding process involves the use of rolls to squeeze two materials together; it may be accomplished at elevated temperatures; examples are cladding of (A) pure aluminum over precipitation-hardened aluminum alloy sheet and (B) stainless steel over mild steel

Answer 10

roll bonding