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Welding
NOCTI Study Guide
1. A class A fire extinguisher can be safely used on a/an ________ fire.
a) b) c) d)
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a) Woodb) Greasec) Electrical d) Magnesium
2. When welding in a confined space, the welder must have
a) b) c) d)
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a) All equipment in the confined space
b) A second welder inside the space
c) An approved breathing device
d) A watchperson outside the space
3. When medium gas welding, a number _______ filter lens should be used.
a) b) c) d)
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a) 2b) 4c) 6d) 8
4. On a drawing with a scale of 1‐inch equals 15‐feet, a line _______ inches represents 40 feet.
a) b) c) d)
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a) 1.27‐inchesb) 1.45‐inchesc) 2.67‐inchesd) 2.85‐inches
5. Information contained in the tail of a welding symbol might include
a) b) c) d)
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a) Type of weldb) Location of weldc) Welding dimensionsd) Welding process
6. Referring to the symbol below, the flag signifies a _________ weld
a) b) c) d)
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o
a) Fieldb) Filletc) Beveld) Groove
7. A neutral oxygen‐acetylene flame has a temperature range of
a) b) c) d)
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a) 500 to 550 ˚Fb) 580 to 630 ˚Fc) 5000 to 5500 ˚Fd) 5800 to 6300 ˚F
8. Use the same style cutting tip for both natural gas and
a) b) c) d)
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a) Acetyleneb) Propanec) Propylened) Mapp
9. When opening an acetylene cylinder, rotate the cylinder valve a maximum of
a) b) c) d)
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a) ½ turnb) 1 turnc) 1½ turnsd) 2 turns
10. Electrodes used for CAC‐A are made of graphite or
a) b) c) d)
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a) Brassb) Carbonc) Magnesiumd) Steel
11. In air carbon arc cutting, compressed air is used to
a) b) c) d)
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a) Cool the work pieceb) Dislodge molten
materialc) Oxidize with fueld) Provide ventilation
12. Which of the following is a ferrous metal?
a) b) c) d)
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a) Aluminumb) Ironc) Copperd) Gold
13. The process of heating a metal and slow cooling it in order to toughen it and reduce brittleness is known as
a) b) c) d)
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a) Temperingb) Carbonizingc) Annealingd) Smelting
14. The ability of a metal to withstand shock loading is known as its
a) b) c) d)
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a) Toughnessb) Hardnessc) Ductilityd) Malleability
***15. In the graphic below, the part of the grooved weld known as the toe is the part labeled number(NOT ENOUGH INFO IN PICTURE – SKIP)
a) b) c) d)
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a) 1b) 2c) 3d) 4
16. If one pound of E‐6010 SMAW electrode costs $0.452 per pound, 80 pounds would cost
a) b) c) d)
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a) $34.27b) $36.16c) $38.53d) $40.12
17. What is the measurement on the 1‐inch scale below?
a) b) c) d)
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a) 1/16b) ⅛c) 3/16d) ¼
18. When using reverse polarity, the electrode will be
a) b) c) d)
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a) Positiveb) Negativec) Alternatingd) Neutral
19. When a transformer type welding machine with a rectifier is in operation, the electrode is supplied with
a) b) c) d)
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a) Alternating currentb) Direct currentc) Higher amperagesd) Higher voltages
20. What is the tensile strength of an E6012 electrode?
a) b) c) d)
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a) 600 psib) 6000 psic) 60,000 psid) 600,000 psi
21. A common welding problem is poor penetration. One of the causes of this problem is
a) b) c) d)
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a) Electrode too smallb) Parts clamped
incorrectlyc) Current too lowd) Arc too long
22. In GMAW and FCAW, __________ or carbon dioxide is added to the shielding gas to improve arc stability and weld
puddle fluidity.
a) b) c) d)
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a) Oxygenb) Nitrogenc) Hydrogend) Helium
23. In GMAW, pieces of electrode sticking to the weld joint are known as
a) b) c) d)
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a) Projectorsb) Stragglersc) Hairlinesd) Whiskers
24. One possible type of metal transfer when employing the GMAW consumable electrode process is ____________
transfer.
a) b) c) d)
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a) Constantb) Circuitedc) Intermittentd) Globular
25. On GMAW welding machine controls, the wire feed speed is used to control
a) b) c) d)
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a) Voltageb) Amperagec) Polarityd) Resistance
26. A consumable in the GTAW process would include
a) b) c) d)
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a) Colletsb) Gas linesc) Regulatorsd) Torch hoses
27. A constant current power supply is required for
a) b) c) d)
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a) GMAWb) GTAWc) FCAWd) SAW
28. An example of an inert gas is
a) b) c) d)
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a) Heliumb) Oxygenc) Chlorined) Nitrogen dioxide
29. In GTAW of aluminum, the most common shielding gas used is
a) b) c) d)
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a) Pure argonb) 75% argon / 25% heliumc) 10% argon / 90% heliumd) Pure helium