23. when striking an arc in smaw welding, why is it important to maintain a proper arc distance from the…

23. when striking an arc in smaw welding, why is it important to maintain a proper arc distance from the work piece?\na) to prevent electrical shock\nb) to keep the electrode from melting\nc) to avoid overheating the work piece\nd) to ensure a good, consistent arc\n24. which of the following is a common defect in smaw welding?\na) porosity\nb) overheating\nc) excessive penetration\nd) all of the above\n25. in smaw welding, the angle between the electrode and the workpiece is known as the:\na) arc angle\nb) travel angle\nc) electrode angle\nd) welding angle\n26. when smaw welding, if the arc is too long, what is the likely result?\na) excessive heat and penetration\nb) poor arc stability\nc) a clean and consistent weld\nd) reduced filler metal deposition\n27. what is the purpose of preheating the base metal in some smaw applications?\na) to cool the base metal\nb) to reduce the welding current\nc) to prevent cracking and improve weld quality\nd) to speed up the welding process\n28. which of the following is a common method for extinguishing the arc in smaw welding?\na) blowing on the arc\nb) tapping the electrode on the workpiece\nc) increasing the amperage\nd) none of the above

23. when striking an arc in smaw welding, why is it important to maintain a proper arc distance from the work piece?\na) to prevent electrical shock\nb) to keep the electrode from melting\nc) to avoid overheating the work piece\nd) to ensure a good, consistent arc\n24. which of the following is a common defect in smaw welding?\na) porosity\nb) overheating\nc) excessive penetration\nd) all of the above\n25. in smaw welding, the angle between the electrode and the workpiece is known as the:\na) arc angle\nb) travel angle\nc) electrode angle\nd) welding angle\n26. when smaw welding, if the arc is too long, what is the likely result?\na) excessive heat and penetration\nb) poor arc stability\nc) a clean and consistent weld\nd) reduced filler metal deposition\n27. what is the purpose of preheating the base metal in some smaw applications?\na) to cool the base metal\nb) to reduce the welding current\nc) to prevent cracking and improve weld quality\nd) to speed up the welding process\n28. which of the following is a common method for extinguishing the arc in smaw welding?\na) blowing on the arc\nb) tapping the electrode on the workpiece\nc) increasing the amperage\nd) none of the above

Answer

Brief Explanations:

  • Question 23: In SMAW welding, maintaining a proper arc distance ensures a stable and consistent arc, which is crucial for good weld quality. Options a (electrical shock prevention is more about insulation and grounding), b (electrode melting is normal and part of the process), and c (overheating workpiece is more related to current and time) are incorrect.
  • Question 24: Porosity (gas trapped in weld), overheating - related issues (though overheating itself might not be a defect in the strictest sense here as it can lead to other problems but is included in the options), and excessive penetration (if not desired) are all common in SMAW welding.
  • Question 25: The angle between electrode and workpiece is defined as the electrode angle. Arc angle is not a standard term here, travel angle is related to the direction of welding movement, and welding angle is too general.
  • Question 26: A long arc in SMAW causes poor arc stability. Excessive heat and penetration (a) occur with high current, a clean and consistent weld (c) is the opposite of what a long arc causes, and reduced filler metal deposition (d) is more related to electrode feed and current.
  • Question 27: Preheating base metal in SMAW is to prevent cracking (due to rapid cooling and thermal stress) and improve weld quality. Cooling (a), reducing welding current (b - current is set based on material and electrode), and speeding up process (d - preheating might slow it down slightly as it's an extra step) are incorrect.
  • Question 28: Blowing on arc (a - not a proper method), tapping electrode (b - can cause short - circuiting but not extinguishing in a controlled way), increasing amperage (c - makes arc stronger). None of these are standard methods for extinguishing the arc in SMAW (usually done by lifting the electrode away properly).

Answer:

  1. d) To ensure a good, consistent arc
  2. d) All of the above
  3. c) Electrode angle
  4. b) Poor arc stability
  5. c) To prevent cracking and improve weld quality
  6. d) None of the above