Kuis

Welding

Welding Processes

Q9-1 Of the following, which is not a necessary requirement for a welding process?
a. source of energy
b. electricity
c. means of shielding molten metal
d. base material
e. none of the above
Q9-2 Which of the following are functions of the flux coating of a SMAW electrode?
a. insulating
b. alloying
c. deoxidation
d. shielding
e. all of the above
Q9-3 In the AWS system of SMAW electrode designations, the next to the last number
refers to:
a. usability
b. electrode coating
c. position
d. strength
e. none of the above
Q9-4 Which of the following is an incorrect statement about a SMAW electrode
designated as an E7024?
a. It is a low hydrogen type
b. The weld deposit has a minimum tensile strength of 70,000 psi.
c. It is suitable for use in the flat and horizontal fillet positions only.
d. all of the above
e. none of the above
Q9-5 Which of the following is not an essential part of a typical SMAW system?
a. constant current power supply
b. wire feeder
c. covered electrode
d. electrode lead
e. work lead
Q9-6 Shielding of the molten metal in GMAW is accomplished through the use of:
a. granular flux
b. slag
c. fuel gas and oxygen
d. a and b above
e. inert and reactive gases
Q9-7 Which of the following is not considered a type of metal transfer for GMAW?
a. short circuiting
b. spray
c. globular
d. droplet
e. pulsed arc
Q9-8 Which of the following types of metal transfer in GMAW is considered to be the
lowest energy, and therefore prone to incomplete fusion?
a. short circuiting
b. spray
c. globular
d. droplet
e. pulsed arc







Q9-9 What type of welding process is pictured below?

a. SMAW
b. GMAW
c. FCAW
d. SAW
e. ESW
Q9-10 Which of the following is not considered an arc welding process?
a. SMAW
b. GMAW
c. FCAW
d. ESW
e. none of the above
Q9-11 In the electrode designation system for FCAW, the second number refers to:
a. strength
b. position
c. chemical composition
d. usability
e. none of the above
Q9-12 Which of the following is not always an essential element of a FCAW system?
a. constant voltage power supply
b. tubular electrode
c. wire feeder
d. shielding gas .
e. work (ground) lead
Q9-13 What aspect of the GTAW and PAW processes is different from the other arc
welding processes?
a. nonconsumable electrode
b. power supply
c. shielding
d. all of the above
e. none of the above
Q9-14 Shielding for the GTAW and PAW processes is accomplished through the use of:
a. granular flux
b. slag
c. inert gas
d. reactive gas
e. none of the above
Q9-15 A green stripe on a tungsten electrode designates:
a. pure tungsten
b. 1 % thoriated tungsten
c. 2% thoriated tungsten
d. zirconated tungsten
e. none of the above
Q9-16 When welding aluminum with the GTAW process, what type of welding current is
most commonly used?
a. DCEP
b. DCEN
c. AC
d. a and b above
e. b and c above
Q9-17 SAW and ESW are similar in that:
a. both are arc welding processes
b. both use shielding gases
c. both use a granular flux
d. a and b above
e. a and c above
Q9-18 The diagram below depicts what welding process?

a. SMAW
b. ESW
c. FCAW
d. SAW
e. PAW
Q9-19 Solidification cracking due to improper width-to-depth ratio of the weld nugget
may be a problem with which welding process?
a. OFW
b. SW
c. SAW
d. all of the above
e. none of the above
Q9-20 A welding process done essentially in the flat position with welding progressing
from the bottom to top of the weld joint positioned vertically identifies:
a. GMAW
b. SAW
c. ESW
d. a and b above
e. b and c above
Q9-21 Which of the following are not common to both GTAW and PAW?
a. nonconsumable tungsten electrode
b. copper constricting nozzle
c. shielding gas nozzle
d. externally-applied filler metal
e. none of the above
Q9-22 What technique is employed with PAW to produce full penetration welds?
a. stringer beads
b. weave beads
c. keyhole `
d. backstep
e. none of the above
Q9-23 What welding process produces welds in the flat position, in a single pass, with the
progression vertically upward along the joint?
a. SAW
b. ESW
c. FCAW
d. a and b above
e. b and c above
Q9-24 Which of the following is not an advantage of the ESW process?
a. high deposition rate
b. ease of setup
c. capable of joining thick sections
d. no tendency for angular distortion
e. none of the above
Q9-25 Which welding process is considered to be a chemical welding process?
a. SMAW
b. ESW
c. SAW
d. OAW
e. none of the above
Q9-26 Which arc welding process provides an efficient means of joining attachments to
some planar surface?
a. OAW.
b. SW
c. GMAW
d. GTAW
e. SMAW
Q9-27 Brazing differs from welding in that:
a. no filler metal is used.
b. an oxyfuel flame is used.
c. the base metal is not melted.
d. all of the above
e. none of the above
Q9-28 For satisfactory results, a braze joint should have:
a. a large surface area.
b. a small gap between pieces to be joined.
c. a precise bevel.
d, a and b above
e. b and c above
Q9-29 Which of the following is not an advantage of brazing?
a. ease of joining thick sections
b. ability to join dissimilar metals
c. ability to join thin sections
d. a and b above
e. b and c above
Q9-30 Of the following met s, which cannot be effectively cut using OFC? a. high carbon
steel
b. low carbon steel
c. medium carbon steel
d. stainless steel
e. none of the above
Q9-31 Which of the following gases can be used to perform OFC?
a. MAPP
b. propane
c. acetylene
d. natural
e. all of the above
Q9-32 Which of the following cutting processes can be used to cut any metal?
a. OFC
b. CAC-A
c. PAC
d. a and b above
e. band c above .
Q9-33 The width of a cut is technically referred to as the:
a. gap
b. dross
c. kerf
d. drag
e. none of the above








Q9-34 Which process is illustrated below?

a. GMAW
b. PAW
c. GTAW
d. BMAW
e. CAW
Q9-35 ESW designates which process?
a. electric slag arc welding
b. electroslag arc welding
c. electric slag welding
d. electroslag welding
e. electric stud welding







Q9-36 Which process is illustrated below?

a. GMAW
b. PAW
c. GTAW
d. TIG
e. CAW
Q9-37 Which process is illustrated below?

a. GMAW
b. PAW
c. GTAW
d. TIG
e. CAW
Q9-38 Which process is illustrated below?

a. GMAW
b. SAW
c. GTAW
d. SW
e. SMAW
Q9-39 SMAW designates which process?
a. stick metal arc welding
b. shielded metal arc welding
c. submerged arc welding
d. seam metal arc welding
e. short circuiting metal arc welding
Q9-40 SW designates which process?
a. stud welding
b. stud arc welding
c. submerged welding
d. stick welding
e. submerged arc welding
Q9-41 SAW designates which process?
a. stud welding
b. stud arc welding
c. submerged welding
d. stick welding
e. submerged arc welding
Q9-42 FCAW designates which process?
a. flux cored arc welding
b. flux centered arc welding
c. furnace controlled arc welding
d. friction arc welding
e. flow arc welding
Q9-43 GMAW designates which process?
a. gas machine arc welding
b. gas method arc welding
c. gas material arc welding
d. gas metal arc welding
e. general material arc welding
Q9-44 GTAW designates which process?
a. gas tungsten arc welding
b. general tungsten arc welding
c. globular transfer arc welding
d. gas torch arc welding
e. none of the above
Q9-45 PAW designates which process?
a. plasma arc welding
b. pressure arc welding `
c. plate arc welding
d. percussion arc welding
e. none of the above
Q9-46 Which of the following could result in the creation of porosity in the GTAW of 6061-
T6 aluminum structural members for an aircraft application? a. insufficient cleaning of the
weld joint
b. contaminated. filler metal
c. leak in the shielding gas hose
d. presence of drafts during the welding operation
e. all of the above
Q9-47 An ER70S-6 electrode can be used with which of the processes?
a. GTAW
b. GMAW
c. PAW
d. all of the above
e. none of the above
Q9-48 A granular flux is a characteristic of which of the following?
a. ESW
b. SAW
c. SMAW
d. both a and b W
c. both b and c
Q9-49 Which of the classifications listed below produces the strongest weld metal?
a. ER70S-6
b. E70T-5
c. E7018
d. F7A2-EM12K
e. no difference
Q9-50 Which process is classified as a chemical welding method?
a. GTAW
b. GMAW
c. ESW
d. PAW
e. OAW
Q9-51 Which cutting methods use electricity?
a. PAC
b. CAC-A
c. OAC
d. a and b above
e. b and c above
Q9-52 A tubular electrode is a significant characteristic of which process? a. SAW
b. ESW
c. FCAW
d. SMAW
e. GMAW
Q9-53 Which arc welding process is used very effectively for the welding of various types
of attachments to surfaces of plates and structural members?
a. SMA /W
b. GMAW
c. FCAW
d. SW
e. ESW
Q9-54 Molding shoes is a term associated with which process?
a. SAW
b. GTAW
c. ESW
d. FCAW
e. GMAW
Q9-55 Short circuiting metal transfer is a mode of operation for:
a. GTAW
b. FCAW
c. SMAW
d. none of the above
e. all of the above
Q9-56 The need for electrode holding ovens for some types of its filler metal is
a disadvantage of which process below?
a. SMAW
b. FCAW
c. SAW
d. all of the above
e. a and b
Q9-57 Which process uses a carbon electrode?
a. SMAW
b. GMAW
c. GTAW
d. CAC-A
e. PAC
Q9-58 EWTh-1 is an electrode designation for which of those processes listed below?
a. GTAW
b. PAW
c. GMAW
d. a and b above
e. b and c above
Q9-59 Of the following which brazing process is preferred when the parts to be brazed can
be assembled with the filler metal preplaced near or in the joint?
a. torch
b. induction
c. furnace
d. diffusion
e. none of the above
Q9-60 F7P6-EM 12 is a filler metal designation for:
a. SMAW
b. GMAW
c. FCAW
d. SAW
e. PAW
Q9-61 The ability to perform keyhole welding is a primary advantage of:
a. GTAW
b. PAW
c. SMAW
d. FCAW
e. SAW
Q9-62 Which gases can be used for OFW?
a. MAPP
b. acetylene
c. natural gas
d. propane
e. all of the above
Q9-63 Which gases below can be used for TB?
a. acetylene
b. oxygen
c. natural gas
d. propane
e. all of the above
Q9-64 A ferrule is an item used for shielding in which process below?
a. ESW
b. PAW
c. PAC
d. SW
e. FB
Q9-65 When GTAW is used, what type of current results in the greatest amount
of penetration?
a. dcen
b. dcep
c. ac
d. hwac
e. no difference
Q9-66 A constricting nozzle is one of the components for which welding process?
a. PAW
b. GTAW
c. SAW
d. GMAW
e. SW
Q9-67 What gases can be used for GMAW?
a. carbon dioxide
b. argon
c. 75% argon-25% carbon dioxide
d. 98% argon-2% oxygen
e. all of the above
Q9-68 The process which can be used either with or without an external shielding gas is:
a. GMAW
b. SMAW
c. FCAW
d. GTAW
e. PAW.
Q9-69 Which of the welding processes below is generally considered to provide the
highest deposition rate?
a. SAW
b. ESW
c. FCAW
d. SMAW.
e. GMAW
Q9-70 When welding carbon steel with the OAW process, the torch should be adjusted to
provide:
a. an oxidizing flame
b. a carburizing flame
c. a neutral flame
d. a heating flame
e. none of the above
Q9-71 Of the following which of the processes make use of water-injected torches to
minimize the effect of irregular kerf?
a. PAC
b. CAC-A
c. GTAW
d. a and b above
e. b and c above
Q9-72 The use of a constricting orifice, is the distinguishing feature of which of
the following?
a. GTAW
b. GMAW
c. FCAW
d. PAW
e. none of the above
Q9-73 Which of the following processes utilize a flux to provide necessary shielding?
a. SMAW
b. SAW
c. GMAW
d. a and b above
e. all of the above

Electron Beam Machining
1. In electron beam machine, just after the cathode, there is/are _____
a) deflector coils
b) a magnetic lens
c) bias grid
d) port for vacuum gauge
Explanation: Just after the cathode, there is an annular bias grid. A high negative bias
is applied to this grid so that the electrons generated by this cathode do not diverge
and approach the next element, the annular anode, in the form of a beam.

2. Electron is accelerated by _____
a) cathode cartridge
b) electromagnetic coils
c) aperture
d) annular anode
Explanation: The annular anode now attracts the electron beam and gradually gets
accelerated. As they leave the anode section, the electrons may achieve a velocity as
high as half the velocity of light.

3. _____ determines the mode of an electron beam.
a) Applied voltage
b) Operating pressure
c) Position of magnetic lens
d) The nature of biasing
Explanation: The nature of biasing just after the cathode controls the flow of
electrons and the biased grid is used as a switch to operate the electron beam gun in
pulsed mode.

4. After the anode, the electron beam passes through _____
a) cathode cartridge
b) deflector coils
c) bias grid
d) a series of lenses
Explanation: After the anode, the electron beam passes through a series of magnetic
lenses and apertures. The magnetic lenses shape the beam and try to reduce the
divergence.

5. In the electron beam gun, apertures ______
a) allow only convergent electrons to pass
b) absorb convergent electrons
 c) allow divergent electrons to pass
d) accelerate the electron beam
Explanation: The magnetic lenses shape the beam and try to reduce the divergence.
Apertures on the other hand allow only the convergent electrons to pass and
capture the divergent low energy electrons from the fringes. This way, the aperture
and the magnetic lenses improve the quality of the electron beam.

6. In the final section of the electron beam gun, electron beam passes through the
electromagnetic lens and deflection coil.
a) True
b) False
Explanation: After the apertures, the electron beam passes through the final section
of the electromagnetic lens and deflection coil. The electromagnetic lens focuses the
electron beam to the desired spot. The deflection coil can manoeuvre the electron
beam, though by small amount, to improve the shape of the machined holes.

7. What is the purpose of a series of slotted rotating discs provided between the
electron beam gun and the workpiece?
a) It increases the accuracy of the beam
b) It can increase the intensity of the beam (if needed)
c) It prevents power losses
d) It prevents vapour generated during machining to reach the gun
Explanation: Generally in between the electron beam gun and the workpiece, which
is also under vacuum, there would be a series of slotted rotating discs. Such discs
allow the electron beam to pass and machine materials but helpfully prevent metal
fumes and vapour generated during machining to reach the gun. Thus it is essential
to synchronize the motion of the rotating disc and pulsing of the electron beam gun.

8. For alignment of the beam, _____ is provided.
a) a lens
b) a telescope
c) magnifier
d) microscope
Explanation: Electron beam guns are also provided with illumination facility and a
telescope for alignment of the beam with the workpiece. Lens are provided to focus
the beam.

9. The workpiece is mounted on a CNC table.
a) True
b) False
 Explanation: In electron beam machining, the workpiece is mounted on a CNC table
so that holes of any shape can be machined using the CNC control and beam
deflection in-built in the gun.

10. Level of vacuum within the gun is in the order of _____
a) 10-4 to 10-6 Torr
b) 10-1 to 10-3 Torr
c) 10-.0.65 to 10-1 Torr
d) 1 to 2 Torr
Explanation: One of the major requirements of EBM operation of electron beam gun
is maintenance of desired vacuum. Level of vacuum within the gun is in the order of
10-4 to 10-6 Torr {1 Torr = 1mm of Hg}.