After each GTAW bead is completed on a fillet weld, what must be done to the bead prior to starting ...

After each GTAW bead is completed on a fillet weld, what must be done to the bead prior to starting the next
  bead?
 
  a. Let it cool.
  b. Preheat it.
  c. Clean it with a grinder.
  d. Clean it with a wire brush.

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[Ques. 2] When making a GTAW fillet weld in the horizontal (2F) position, pay close attention to the _
 
  a. weld starts
  b. torch angles
  c. weld terminations
  d. percentage

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[Ques. 3] When running the fourth bead of a GTAW fillet weld in the 1F position, how much of the second bead should
  you overlap?
 
  a. 1/4
  b. 1/3
  c. 1/2
  d. 3/4

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[Ques. 4] When terminating a GTAW weld, the crater must be filled to the full cross section of the weld to prevent _____.
 
  a. cracking
  b. overfill
  c. melt-through
  d. root fusio

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[Ques. 5] The welding procedure that is done by working the weld puddle back and forth across the axis of the weld,
  producing a weld bead much wider than the puddle width, is the _____.
 
  a. stringer bead
  b. weave bead
  c. groove weld
  d. fillet weld