2015 AGSC 1352 FINAL EXAM REVIEW
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. Flux is essential when welding gray cast iron because it _____.
a. all of the above b. prevents inclusions and porosity c. keeps the molten weld pool fluid d. prevents iron oxides from becoming trapped in the weld
____ 2. An E7014 electrode can be used with ______ current.
a. DCEP b. AC c. DCEN d. all of the above
____ 3. A welding machine is rated according to its approximate amperage capacity at 60% duty cycle.
a. True b. False
____ 4. DCEP allows deeper penetration than DCEN.
a. False b. True
____ 5. For joint efficiency in a lap joint, an overlap greater than three times the thickness of the thinnest member is recommended.
a. False b. True
____ 6. A crater is formed when the arc comes in contact with the base metal.
a. False b. True
____ 7. When moving an oxygen or acetylene cylinder, the cylinder should be carefully rolled on its bottom edge.
a. True b. False
____ 8. ____ is the shielding gas most commonly used for GMAW.
a. Oxygen b. Helium c. none of the above d. Hydrogen
____ 9. When welding with DCEP, electrons flow from the ____ to the ____.
a. electrode; workpiece b. workpiece; ground c. none of the above d. workpiece; electrode
____ 10. A(n) ______ is used to remove slag after the weld is deposited.
a. cutting torch b. none of the above c. chipping hammer d. electrode holder
____ 11. When welding a T-joint in flat position, the torch is held at a ____degree angle to the workpiece.
a. 75 b. 45 c. 30 d. 60
____ 12. Shielded metal arc welding is sometimes called stick welding.
a. True b. False
____ 13. A(n) ____ electrode is preferred for welding in overhead position.
a. fill-freeze b. fast-fill c. iron powder d. fast-freeze
____ 14. Welding as an occupation does not require specific training.
a. True b. False
____ 15. Unlike GMAM, FCAW uses a _____.
a. tubular electrode b. all of the above c. power source d. wire feeder
____ 16. Before starting a welding operation, one should _____.
a. adjust the welding machine to the approximate current b. all of the above c. inspect welding lead connections d. make sure the bench top is clean and dry
____ 17. The first two digits in an AWS numerical electrode classification designate the minimum allowable ____ of the weld metal in thousands of pounds per square inch.
a. composition b. bending strength c. compressive strength d. tensile strength
____ 18. The FCAW-S process requires a shielding gas.
a. False b. True
____ 19. All welding equipment must be installed according to provisions of the ___________.
a. owner's manual b. Occupational Safety & Health Administration c. Code of Federal Regulations d. National Electrical Code
____ 20. Welding is a more expensive process compared to other methods of joining materials.
a. False b. True
____ 21. When lighting a welding torch, one should ____________.
a. all of the above b. match the tip size to the thickness of the metal c. hold the tip downward when lighting d. always use a sparklighter to relight a flame
____ 22. When welding or cutting a hollow casting, a vent is required to allow for the release of air pressure or steam.
a. False b. True
____ 23. Welding with an arc length that is too short will produce too much penetration and melt-through in the base metal.
a. True b. False
____ 24. A number ___ torch tip is recommended for cutting metal 1/2" thick.
a. 3 b. 2 c. 1 d. 0
____ 25. The GTAW process uses an electrode that is not consumed in the weld.
a. False b. True
____ 26. Welding current that is too high results in excessive _____.
a. spatter b. bead height c. travel speed d. overlap
____ 27. In the United States, alternating current is rated at 50 Hz.
a. True b. False
____ 28. A narrow weld bead with pointed ripples results if the travel speed is too slow.
a. False b. True
____ 29. When using oxygen and acetylene cylinders, open the valves __________.
a. none of the above b. with a pair of pliers c. slowly d. quickly
____ 30. Tack welds should not penetrate the root of the groove.
a. False b. True
____ 31. A Class _____ fire is caused by most combustible materials such as wood, paper, rubber, plastic, and cloth.
a. C b. K c. A d. B
____ 32. Moisture can damage the coating on an electrode.
a. True b. False
____ 33. The rate at which the electrode is moved along the weld joint is the _____.
a. electrode angle b. scratching speed c. travel speed d. arc length
____ 34. Heat directed to the weld joint should be ____ to prevent the weld pool from becoming too large too fluid when welding butt joint in vertical position.
a. weld pool b. filler metal c. none of the above d. base metal
____ 35. A transformer ________.
a. may have an arc booster to increase current b. all of the above c. produces alternating current d. changes voltage from one level to another
____ 36. The root pass should not penetrate the bottom of the joint more than ____".
a. 1/4 b. 3/8 c. none of the above d. 3/16
____ 37. When carrying a weld pool without filler metal, the inner cone of the flame is held approximately 1/8 inch from the workpiece.
a. True b. False
____ 38. The correct diameter filler metal is approximately ____ the thickness of the base metal.
a. one-half b. none of the above c. equal to d. twice
____ 39. To ignite the flame on the cutting torch, the ____ is opened first.
a. oxygen needle valve b. acetylene needle valve c. none of the above d. oxygen control lever
____ 40. Amperage is the quantity of electricity measured in a circuit.
a. False b. True
____ 41. The four basic welding positions are flat, horizontal, vertical, and overhead.
a. True b. False
____ 42. Acetylene gas _______________________.
a. must be used in a mixture with MAPP gas b. has a very distinctive, nauseating odor c. is yellow in color d. none of the above
____ 43. _______ can be used to determine the correct connections to be made when using oxygen and acetylene gases.
a. Notched connecting nuts b. all of the above c. Hose color d. Right-handed threads
____ 44. An oxidizing flame has a slight feather extending from the inner cone of the flame.
a. False b. True
____ 45. _________ must be considered when selecting a weld joint.
a. Whether a load is in tension or compression and if bending, fatigue, or impact stresses will be encountered b. all of the above c. Whether a load is a steady, impact, or variable load d. Direction of the load
____ 46. FCAW produces less distortion than SMAW and smooth, uniform beads.
a. False b. True
____ 47. Peening is performed prior to preheating the structure to be repaired.
a. False b. True
____ 48. The work angle of an electrode is approximately 90 degrees when depositing continuous beads.
a. False b. True
____ 49. The gas tungsten arc welding process was used before the oxyacetylene welding process was developed.
a. True b. False
____ 50. _____ is the last step to take when shutting off the entire welding unit after all welding is complete.
a. Shutting off both the acetylene and oxygen cylinder valves b. Releasing the adjusting screws on the pressure regulators c. none of the above d. Removing pressure on the working gauges by opening the needle valves until the lines are drained, than promptly closing the needle valves
____ 51. The preferred shielding gas for welding thin copper is argon.
a. True b. False
____ 52. When welding, a humming noise usually indicates that the current and arc length are correct.
a. False b. True
____ 53. Any form of horseplay on a job site is dangerous and can lead to an accident.
a. False b. True
____ 54. An E6010 electrode produces a flat bead and can be used in all positions.
a. False b. True
____ 55. E6010 and E6011 electrodes are commonly used for pipe welding.
a. True b. False
____ 56. In most GMAW operations, the electrode is positive and the work is negative.
a. True b. False
____ 57. The oxygen cylinder valve is opened with a wrench.
a. False b. True
____ 58. Resistance is the force that causes current to move in a circuit.
a. False b. True
____ 59. When welding a butt joint in vertical position, more of the flame should be directed on the weld pool.
a. True b. False
____ 60. Filler metal is added ________ to prevent undercutting.
a. on top of the torch flame b. closer to the bottom workpiece c. closer to the top workpiece d. none of the above
____ 61. An MSDS provides information about every hazardous component o fa material's content.
a. True b. False
____ 62. When using a constant-voltage welding machine, the ___ changes with a change in the arc length.
a. current b. none of the above c. voltage d. gas flow
____ 63. Welding with too much current causes the electrode to stick.
a. True b. False
____ 64. A transformer produces AC current.
a. False b. True
____ 65. A course in _____ is helpful to a person considering a career as a welder
a. all of the above b. blueprint reading c. metals d. mathematic
____ 66. ____ may be required after weld repair to restore mechancial properties.
a. Root welding b. Tack welding c. Preheating d. Postheating
____ 67. A ____ is made by the penetration of the root pass and must be completely filled when restarting the root pass.
a. crater b. slag inclusion c. keyhole d. tack weld
____ 68. The oxygen working-pressure gauge is marked with a warning color above 15 psi.
a. True b. False
____ 69. When welding a multiple-pass fillet lap weld, the last pass is deposited with a(n) ____.
a. intermediate weld pass b. small-diameter electrode c. 90 degree travel angle d. weaving motion
____ 70. Undercutting can occur if the current is set too high.
a. False b. True
____ 71. Oxyfuel welding processes use heat from the combination of a mixture of oxygen and fuel for welding.
a. True b. False
____ 72. Preheat holes are used to blow the molten metal away from the cutting section.
a. True b. False
____ 73. _____ is the distance between the electrode and the workpiece.
a. Travel angle b. Arc length c. Current length d. Electrode gap
____ 74. The ______ welding process is known for its mobility and flexibility.
a. gas metal arc b. shielded metal arc c. resistance d. none of the above
____ 75. Factors such as size and type of electrode, current, and welding position all affect the travel speed.
a. False b. True
____ 76. MAPP gas is more sensitive to shock than acetylene.
a. False b. True
____ 77. The penetration of a deposited bead should equal _____ the total thickness of the weld bead.
a. one-third to one-half b. two times c. two to three times d. one-eighth to one-third
____ 78. As the current is increased, _____ is greater.
a. electrode burn-off b. penetration c. all of the above d. heat
____ 79. Weld metal deposited should have approximately the same mechanical properties as the ___.
a. slag b. shielding gas c. base metal d. flux coating
____ 80. A respirator is used when welding metals that give off _____________ fumes.
a. toxic b. electrode c. acetylene d. oxygen
____ 81. Two types of regulators are the single-stage and the two-stage.
a. True b. False
____ 82. _________________ gives off toxic fumes when welding.
a. Galvanized steel b. High carbon steel c. none of the above d. Aluminum
____ 83. The acetylene needle valve should be opened fully to ensure quick lighting of the torch.
a. False b. True
____ 84. An _____ is a fill-freeze electrode.
a. E6011 b. E6010 c. E7028 d. E6013
____ 85. An electrode should always be used until it is burned down to a 4 inch stub.
a. True b. False
____ 86. A __________ allows the flow of liquid or gas in one direction only.
a. check valve b. tip c. flash arrestor d. needle valve
____ 87. An _____ is a fast-freeze electrode.
a. E6012 b. E6024 c. E6010 d. E6020
____ 88. ____ is not a consideration when selecting an electrode.
a. Welding position b. None of the above c. Welding current and polarity d. Electrode diameter
____ 89. A weaving motion is often used when depositing a root bead.
a. True b. False
____ 90. The ____ of the base metal determines the diameter of the filler metal used.
a. thickness b. surface c. all of the above d. composition
____ 91. Voltage is increased by increasing the wire feed speed in a GMAW process.
a. True b. False
____ 92. Oxygen comnprises 78% of air.
a. True b. False
____ 93. The size of a welding tip depends on the amount of pressure used.
a. False b. True
____ 94. The heat of the torch should be concentrated on the base metal when depositing weld beads with filler metal.
a. False b. True
____ 95. With DCEN, more heat is directed to the electrode than to the workpiece.
a. False b. True
____ 96. Some electrodes have coatings that include iron powder, which converts to steel and becomes part of the weld deposit.
a. False b. True
____ 97. Accidents occur because of _________________.
a. all of the above b. carelessness c. lack of information d. indifference to regulations
____ 98. Measures that can be taken to prevent arc blow includes ____.