29. in smaw welding, what is \weaving\?\na) a pattern used to control the shape of the weld bead\nb) a type…

29. in smaw welding, what is \weaving\?\na) a pattern used to control the shape of the weld bead\nb) a type of electrode\nc) a technique used to strike the arc\nd) a type of welding machine\n30. what is the purpose of the post - weld cleaning process in smaw welding?\na) to add additional filler material to the weld\nb) to inspect the weld for defects\nc) to remove slag and spatter from the weld\nd) to cool the workpiece\n31. which of the following is not a type of electrode used in smaw welding?\na) e6010\nb) e7018\nc) e308\nd) e9012\n32. in smaw welding, what does \amperage\ refer to?\na) the rate of heat transfer in the welding process\nb) the size of the electrode\nc) the electrical current used in the welding process\nd) the shape of the weld bead\n33. in smaw welding, what is the purpose of the backstep technique?\na) to create a decorative pattern on the weld bead\nb) to repair defects in the weld\nc) to control the cooling rate of the weld\nd) to maintain a consistent arc length\n34. which of the following is a common cause of \undercut\ in smaw welding?\na) excessive heat input\nb) insufficient amperage\nc) incorrect electrode angle\nd) lack of preheating

29. in smaw welding, what is \weaving\?\na) a pattern used to control the shape of the weld bead\nb) a type of electrode\nc) a technique used to strike the arc\nd) a type of welding machine\n30. what is the purpose of the post - weld cleaning process in smaw welding?\na) to add additional filler material to the weld\nb) to inspect the weld for defects\nc) to remove slag and spatter from the weld\nd) to cool the workpiece\n31. which of the following is not a type of electrode used in smaw welding?\na) e6010\nb) e7018\nc) e308\nd) e9012\n32. in smaw welding, what does \amperage\ refer to?\na) the rate of heat transfer in the welding process\nb) the size of the electrode\nc) the electrical current used in the welding process\nd) the shape of the weld bead\n33. in smaw welding, what is the purpose of the backstep technique?\na) to create a decorative pattern on the weld bead\nb) to repair defects in the weld\nc) to control the cooling rate of the weld\nd) to maintain a consistent arc length\n34. which of the following is a common cause of \undercut\ in smaw welding?\na) excessive heat input\nb) insufficient amperage\nc) incorrect electrode angle\nd) lack of preheating

Answer

Brief Explanations:

  • Question 29: In SMAW (Shielded Metal Arc Welding), weaving is a pattern (side - to - side movement) used by the welder to control the shape of the weld bead. It helps in distributing heat, controlling penetration, and achieving a wider weld bead.
  • Question 30: The post - weld cleaning process in SMAW is mainly to remove slag (a by - product of the welding process) and spatter (small droplets of molten metal that have been ejected from the weld pool) from the weld. This is done to prepare the weld for inspection (if visual inspection is done immediately after cleaning) and also for aesthetic and sometimes functional reasons (if the weld is part of a structure where debris could cause issues).
  • Question 31: In SMAW, common electrode types include E6010 (used for pipe welding, deep penetration), E7018 (general - purpose, low - hydrogen electrode), and E308 (used for stainless - steel welding). E9012 is not a standard electrode type used in SMAW.
  • Question 32: Amperage in SMAW refers to the electrical current used in the welding process. The amperage setting affects the heat input (higher amperage means more heat), the melting rate of the electrode, and the penetration into the base metal.
  • Question 33: The backstep technique in SMAW is used to control the cooling rate of the weld. By welding in short segments (backsteps), it helps in reducing distortion and residual stresses in the weldment.
  • Question 34: An incorrect electrode angle is a common cause of undercut in SMAW. If the electrode is not angled correctly, it can cause the molten metal to flow in a way that leaves a groove (undercut) along the edge of the weld bead. Excessive heat input can cause other defects like burn - through or excessive penetration, insufficient amperage may lead to lack of fusion, and lack of preheating is more related to issues like cracking.

Answer:

  1. a) A pattern used to control the shape of the weld bead
  2. c) To remove slag and spatter from the weld
  3. d) E9012
  4. c) The electrical current used in the welding process
  5. c) To control the cooling rate of the weld
  6. c) Incorrect electrode angle