Download Introduction to Production Welding

Introduction to Production Welding
Quiz #1 – Arc Fundamentals
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1. Current is the force with which electrons flow in a circuit.
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2. Amperage is a measure of the opposition to current in a circuit.
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3. Voltage is the number of electrons that pass a certain point in a given amount of time.
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4. Resistance creates the heat in a welding circuit.
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5. In DCEN welding, most of the heat is at the work piece.
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6. The DCEP arc is a mild, non-digging arc with high deposition rate.
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7. Arc blow is a major disadvantage of AC welding.
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8. Molten metal does not need to be shielded from atmospheric oxygen, nitrogen, and hydrogen.
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9. In AC welding, the work piece has practically all of the arc heat.
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10. The ground lead provides means for holding the electrode.
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Intro to Production Welding
Quiz #2 – SMAW
1. The stick electrode coating helps to shield the molten puddle from the atmosphere.
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2. The stick electrode coating helps to speed up the cooling rate of the weld deposit.
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3. A 6013 electrode has a cellulose coating which gives a fast-freezing puddle.
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4. A 6010 electrode is classified for use in the flat and horizontal positions only.
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5. A 6013 electrode can be used with AC only.
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6. DCEN will provide deeper penetration than DCEP.
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7. When arc length is increased, voltage increases.
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8. When arc length is too long, the weld bead gets high and narrow.
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9. When travel speed is too fast, the weld bead gets narrow.
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10. When amperage is too high the weld bead gets wide, very fluid, and hard to control.
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Intro to Production Welding
Quiz #3 – GMAW/FCAW
1. Short circuit transfer produces a very fluid puddle and can only be used in the flat position.
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2. Excessive WFS can result in stubbing and wire pile up.
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3. The larger the wire diameter, the more WFS required to achieve a desired amperage.
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4. When stickout is increased, amperage also increases.
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5. When voltage is increased, arc length also increases.
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6. Penetration is primarily determined by WFS.
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7. Hydrogen and nitrogen are the most common shielding gases for GMAW.
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8. Spray transfer occurs at lower amperages and voltages than short circuit transfer.
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9. Excessive voltage can result in too flat a bead, with undercut at the toes.
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10. The wire travels through the gun cable in the liner.
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Intro to Production Welding
Quiz #4 – GTAW
1. Most GTAW is done with DCEP.
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2. A smaller diameter tungsten electrode will carry more current than a larger one.
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3. All GTAW is done with filler material.
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4. Amperage can be controlled with a remote device such as a foot pedal.
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5. Arc length has no effect on weld appearance.
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6. The postflow function allows the shielding gas to flow after the arc is extinguished.
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7. Hydrogen and oxygen are the most common shielding gases for GTAW.
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8. Tungsten has a lower melting temperature than most other metals.
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9. The high frequency function allows arc starting without touching the electrode to the work.
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10. GTAW can only be used for mild steel.
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