Self-Test B-6.4: Use Arc Welding Equipment

Complete Self-Test B-6.4 and check your answers.

1. Which of the following best describes the amount of weld produced with 1″ of electrode when correct speed is used?
   1. 1″
   2. 1 1/2″
   3. 2″
   4. 3″
2. Which of the following best describes the correct angle for the electrode?
   1. 20–30° off perpendicular in direction of travel
   2. 20–30° off perpendicular away from direction of travel
   3. Perpendicular to work
   4. 45° off perpendicular in direction of travel
3. What What does a hissing sound during welding indicate?
   1. Electrode too far from work
   2. Electrode too close to work
   3. Electrode ideal distance from work
   4. Amperage is too high
4. What is the most common cause of undersized welds?
   1. Rate of travel that is too fast
   2. Welding current that is too low
   3. Incorrect polarity
   4. Rate of travel that is too slow
5. Which weld defect is shown in Figure 1?

   1. 

      Incomplete penetration

   2. Cracking
   3. Porosity
   4. Undercut
6. Which defect is shown in Figure 2?

   1. 

      Porosity

   2. Cracking
   3. Lack of fusion
   4. Slag inclusion
7. Which of the following is the major cause of incomplete penetration?
   1. Incorrect joint design
   2. Too small an electrode
   3. Failure to heat the base metal
   4. Rate of travel is too slow
8. Which of the following suffers from hot cracking?
   1. Mild steel
   2. High-alloy steel
   3. Low-hydrogen electrodes
   4. Joints that are cooled slowly
9. In which of the following conditions do crater cracks often occur?
   1. Current is too low
   2. Electrode is defective
   3. Welding has been interrupted
   4. Base metal has been preheated
10. Which of the following actions will help prevent slag inclusion?
    1. Extending the arc length
    2. Reducing the current setting
    3. Using coated electrodes or fluxes
    4. Cleaning all slag from the surface of the previous bead
11. Which of the following is the most common cause of undercut?
    1. Too little current
    2. Too rapid cooling
    3. Improper electrode manipulation
    4. Improper cleaning of base metal
12. Which of the following is the most common cause of distortion?
    1. Porosity in the weld metal
    2. Pre- and post-heat treatments
    3. Hot cracking in the weld metal
    4. Uneven expansion and contraction within a metal
13. Which of the following is a mechanical means of preventing distortion?
    1. Pre-bending
    2. Multi-pass welding
    3. Intermittent welding
    4. Back-step sequences
14. Which of the following butt joint preparations is most prone to angular distortion?
    1. U-butt joint
    2. Double vee joint
    3. Square butt joint
    4. Single vee butt joint
15. Which of the following terms describe a serious defect in which excess weld metal is deposited at the toe of the weld and is most often a sign of poor fusion between the weld and parent metal?
    1. Overlap
    2. Porosity
    3. Undercut
    4. Distortion

Answer Key: Self-Test B-6.4 is on the next page.