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MP CH30 Flashcards - Cram.com Welding Processes Ch 30

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MP CH30 Flashcards - Cram.com

30.1 The feature that distinguishes fusion welding from solid-state welding is that melting of the fayingsurfaces occurs during fusion welding but not in solid-state welding: (a) true or (b) false?

30.2 Which of the following processes are classified as fusion welding (three correct answers): (a)electrogas welding, (b) electron-beam welding, (c) explosion welding, (d) forge welding, (e) laserbeamwelding, and (f) ultrasonic welding?

MP CH30 Flashcards - Cram.com welding processes ch 30

Answer. (a), (b), and (e).

30.3 Which of the following processes are classified as fusion welding (two correct answers): (a)diffusion welding, (b) friction welding, (c) pressure gas welding, (d) resistance welding, and (e) rollwelding?

30.4 Which of the following processes are classified as solid-state welding (three correct answers): (a)diffusion welding, (b) friction stir welding, (c) resistance spot welding, (d) roll welding, (e) thermitwelding, and (f) upset welding?

Answer. (a), (b), and (d).

30.5 An electric arc is a discharge of current across a gap in an electrical circuit. The arc is sustained inarc welding processes by the transfer of molten metal across the gap between the electrode and thework: (a) true or (b) false?

MP CH30 Flashcards - Cram.com welding processes ch 30

Answer. (b). The arc is sustained, not by the transfer of molten metal, but by the presence of athermally ionized column of gas through which the current flows.

30.6 Which one of the following arc welding processes uses a nonconsumable electrode: (a) FCAW, (b)GMAW, (c) GTAW, or (d) SMAW?

30.7 MIG welding is a term sometimes applied when referring to which one of the following processes:(a) FCAW, (b) GMAW, (c) GTAW, or (d) SMAW?

30.8 "Stick" welding is a term sometimes applied when referring to which one of the followingprocesses: (a) FCAW, (b) GMAW, (c) GTAW, or (d) SMAW?

30.9 Which one of the following AW processes uses an electrode consisting of continuous consumabletubing containing flux and other ingredients in its core: (a) FCAW, (b) GMAW, (c) GTAW, or (d)SMAW?

MP CH30 Flashcards - Cram.com welding processes ch 30

30.10 Which one of the following arc-welding processes produces the highest temperatures: (a) CAW, (b)PAW, (c) SAW, or (a) TIG welding?

30.11 Resistance-welding processes make use of the heat generated by electrical resistance to achievefusion of the two parts to be joined; no pressure is used in these processes, and no filler metal isadded: (a) true or (b) false?

Answer. (b). Pressure is applied in RW processes and is key to the success of these processes.

30.12 Metals that are easiest to weld in resistance welding are ones that have low resistivities since lowresistivity assists in the flow of electrical current: (a) true or (b) false?

Answer. (b). Metals with low resistivities, such as aluminum and copper, are difficult to weld inRW. Higher resistance is required in the conversion of electrical power to heat energy; hence,metals with high resistivity are generally preferable.

MP CH30 Flashcards - Cram.com welding processes ch 30

30.13 Oxyacetylene welding is the most widely used oxyfuel welding process because acetylene mixedwith an equal volume of oxygen burns hotter than any other commercially available fuel: (a) true or(b) false?

30.14 The term "laser" stands for "light actuated system for effective reflection": (a) true or (b) false?

Answer. (b). Laser stands for "light amplification by stimulated emission of radiation."

30.15 Which of the following solid-state welding processes applies heat from an external source (two bestanswers): (a) diffusion welding, (b) forge welding, (c) friction welding, and (d) ultrasonic welding?

30.16 The term weldability takes into account not only the ease with which a welding operation can beperformed, but also the quality of the resulting weld: (a) true or (b) false?

MP CH30 Flashcards - Cram.com welding processes ch 30

30.17 Copper is a relatively easy metal to weld because its thermal conductivity is high: (a) true or (b)false?

Answer. (b). True that copper has a high thermal conductivity, one of the highest of any metal, butthis is one of the main reasons why copper is generally difficult to weld. The heat readily flows intothe body of the parts that are to be welded, rather than remaining at the localized region where thejoint is to be made.

MP CH30 Flashcards - Cram.com

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