Deck 30: Other Welding Processes

Question 1

Resistance welding machines contain a(n) ____ to regulate the time of the weld cycle.

A) mechanical system
B) electrical circuit
C) current regulator
D) control system

Answer 1

D

Question 2

The ____ is the time during which the electrodes are not contacting the workpieces.

A) squeeze time
B) weld time
C) hold time
D) off period

Answer 2

D

Question 3

Temperatures up to ____ F are generated by electron beam welding machines.

A) 800°
B) 1,800°
C) 18,000°
D) 180,000°

Answer 3

D

Question 4

____ welding is a form of friction welding.

A) Resistance spot welding
B) Ultrasonic
C) Electron beam
D) Inertia

Question 5

Laser beams have a heat input of ____ joules.

A) 0.001 to 0.01
B) 0.01 to 0.1
C) 0.1 to 10
D) 1 to 10

Question 6

Laser welds are ____.

A) small, generally less than 0.0001 inches
B) small, sometimes less than 0.001 inches
C) always at least 0.01 inches
D) always at least 0.1 inches

Question 7

In resistance welding, ____ is applied to ensure a continuous electrical circuit and to forge the heated parts together.

A) heat
B) a chemical spray
C) a plasma arc
D) pressure

Question 8

The ____ is the time between the first application of electrode force and the first application of welding current.

A) squeeze time
B) weld time
C) hold time
D) off period

Question 9

In hardfacing, deposited layers may be as thin as ____ in.

A) 1/32
B) 1/16
C) 3/32
D) 3/16

Question 10

With SAW, ESW, and EGW, the total cost of fabrication is ____, and it provides the same or ____ service.

A) higher, better
B) higher, worse
C) lower, better
D) lower, worse

Question 11

In ____, the movement of the upper electrode is controlled by a pneumatic or hydraulic cylinder.

A) rocker-arm spot welders
B) press-type spot welders
C) portable spot welders
D) resistance welders

Question 12

____ are used in the mass production of automobiles, aircraft, railroad cars, home appliances, and similar products where relatively thin sheets are to be welded.

A) Rocker-arm spot welders
B) Press-type spot welders
C) Portable spot welders
D) Resistance welders

Question 13

In which of the following general groups are tungsten carbide and chromium electrodes classified?

A) Resistance to impact
B) Resistance to severe abrasion
C) Resistance to severe impact
D) Resistance to moderate abrasion

Question 14

Both kVa and watts are ____ measurements.

A) energy
B) heat
C) voltage
D) power

Question 15

Resistance welding machines contain a(n) ____ to hold the workpiece and apply the electrode force.

A) mechanical system
B) electrical circuit
C) current regulator
D) control system

Question 16

The heat produced in a weld is expressed in the formula ____.

A) H = I²R
B) H = IR²
C) H = IR
D) H = (IR)²

Question 17

The ____ is the period during which the electrode force is applied and the welding current is shut off.

A) squeeze time
B) weld time
C) hold time
D) off period

Question 18

In ____, the lower electrode is stationary while movement is transferred to the upper electrode by means of an arm, which moves about a pivot point.

A) rocker-arm spot welders
B) press-type spot welders
C) portable spot welders
D) resistance welders

Question 19

____ welding is accomplished by using roller-type electrodes.

A) Seam
B) Ultrasonic
C) Flash
D) Upset

Question 20

The term kVa stands for ____.

A) kilovoltage
B) kerf volt amps
C) kilovolt amps
D) kilovolt amplifier

Question 21

SAW filler metals are available in wires that come in sizes ____.

A) of 1/16 inch
B) from 1/16 inch to 1/8 inch
C) from 1/8 inch to 1/4 inch
D) from 1/16 inch to 1/4 inch

Question 22

The classification of flux depends on ____.

A) its chemical composition
B) the mechanical properties of the weld metal deposited
C) the range of manganese
D) the carbon points

Question 23

If an electrode is classified EL5K, which of the following is true?

A) It has high manganese.
B) It has 5% carbon.
C) It was drawn from silicon-killed, deoxidized steel.
D) It has no carbon.

Question 24

Strip electrodes can be as wide as ____ inches.

A) 2
B) 3
C) 4
D) 5

Question 25

More than ____ lb/hr can be deposited using large-diameter SAW wires.

A) 40
B) 50
C) 60
D) 70

Question 26

If the letter K is used in electrode classification, it refers to ____.

A) the normal carbon point
B) the range of manganese
C) silicon-killed, deoxidized steel
D) an electrode

Question 27

The letter that refers to the range of manganese can either be ____.

A) M, N, or K
B) E, F, or G
C) L, M, or H
D) E, F, or K

Question 28

Which of the following is true of electroslag welding?

A) The arc is produced below the molten flux surface.
B) The heat for welding is produced by current transferred from the electrode to the work.
C) The slags produced are highly conductive in a molten state.
D) The slags must be relatively shallow to maintain the circuit.

Question 29

In SAW, the heat is produced from ____.

A) a chemical reaction in the flux
B) an arc between the work and a metal electrode
C) heat applied to granular flux material
D) the atmosphere reacting with the flux

Question 30

Submerged arc welding was introduced in the ____.

A) 1930s
B) 1940s
C) 1950s
D) 1960s

Question 31

What shielding gas or gases work(s) well with electrogas welding?

A) Helium (He)
B) Nitrogen (N)
C) Argon (Ar)
D) A mixture of carbon dioxide (CO₂) and argon (Ar)

Question 32

In the flux classification system, the letter Z indicates ____.

A) no impact strength test is required
B) no tensile strength test is required
C) the flux passed the minimum impact strength test
D) the flux passed the minimum tensile strength test

Question 33

In the flux classification system, the letter P indicates the ____.

A) psi minimum tensile strength of the weld
B) weld metal was tested in pre-weld condition
C) weld was tested after the postweld heat treatment
D) foot-pound impact strength test

Question 34

____ is(are) used for surfacing applications in SAW.

A) Strip electrodes
B) Backing strips
C) Twisted wire
D) Bulk wire

Question 35

In EGW, the molten weld pool is protected from the atmosphere by ____ or by a flux core in the filler electrode.

A) oxygen in the atmosphere
B) a thick blanket of slag
C) shielding gas
D) a thick blanket of molten flux

Question 36

Which of the following is an advantage of electroslag welding?

A) Inexpensive welding equipment
B) Quick setup time
C) Can be used on any thickness of plate
D) Minimum distortion

Question 37

If a flux is classified as F3A2, it has ____ psi minimum tensile strength.

A) 3
B) 2,000
C) 20,000
D) 30,000

Question 38

The basic flux classification is prefixed with the letter ____.

A) E
B) F
C) K
D) L

Question 39

AWS electrode classifications are prefixed with the letter ____.

A) E
B) F
C) K
D) L

Question 40

In AWS electrode classification, one carbon point equals ____% carbon.

A) 0.01
B) 0.1
C) 1
D) 10

Question 41

Explain the resistance projection welding process.

Question 42

What benefit is provided by surfacing as performed with a combination of laser beam and GMAW?

Question 43

In ____________________ welding, fusion is obtained simultaneously over the entire area of the contacting surfaces.

Question 44

Automation has made ____ a highly reliable way to achieve welds with 100% weld integrity.

A) FSW
B) SW
C) PAW
D) MPW

Question 45

Summarize the process of thermal spraying.

Question 46

The addition of ____________________ to the GTAW process greatly expands its range of benefits.

Question 47

Explain how electron beam welding works.

Question 48

____________________ welding is a semiautomatic or automatic arc welding process in which an arc is drawn between a metal stud and the surface to which it is to be joined.

Question 49

In ____________________ welding, a plasma jet is produced by forcing gas to flow along an arc restricted electromagnetically as it passes through a nozzle.

Question 50

____________________ is the term used to describe vapors of materials that are raised to a higher energy level than the ordinary gaseous state.

Question 51

____________________ welding is a process where fusion between the parts' surfaces occurs as a result of the heat produced by the electric resistance between the parts' contacting surfaces.

Question 52

____________________ is the process of obtaining desired properties or dimensions by applying an integral layer of metal of one composition onto a surface of a base metal of another composition.

Question 53

In ____________________ welding, fusion is produced over the ends of stock by heat produced from the resistance to the flow of electric current between the two surfaces.

Question 54

Combining LBW and GMAW results in which significant enhancement?

A) Decreased GMA welding speed
B) Improved strength, ductility, corrosion tolerance, and machinability
C) Reduced weld reinforcement
D) Increased slag

Question 55

____________________ welding is a process for joining similar and dissimilar metals by introducing high-frequency vibrations into the overlapping metals in the area to be joined.

Question 56

Explain how laser beams work.

Question 57

In ____________________ welding, fusion is obtained by directing a highly concentrated beam of coherent light to a very small spot.