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Welding Certification — Knowledge Practice

Joints and weld terms: practice questions

Our Welding Knowledge bank has 12 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What is the heat-affected zone (HAZ)?

  1. The area of the arc
  2. The weld metal
  3. The filler metal
  4. The part of the base metal not melted but whose properties were changed by heat
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D. The part of the base metal not melted but whose properties were changed by heat — HAZ hardness and toughness matter in qualification.

Question 2

What is a 'groove weld'?

  1. A fillet weld
  2. A weld on the surface only
  3. A weld made in a groove between members, often to achieve full penetration
  4. A spot weld
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C. A weld made in a groove between members, often to achieve full penetration — Groove types include square, V, bevel, U and J.

Question 3

How is the size of an equal-leg fillet weld usually specified?

  1. By its leg length
  2. By its throat only
  3. By its width only
  4. By its color
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A. By its leg length — The effective throat is about 0.707 × leg for a 45° fillet.

Question 4

What is the 'toe' of a weld?

  1. The deepest part of the root, where the two members meet
  2. The middle of the weld face
  3. The start of the weld
  4. The junction between the weld face and the base metal
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D. The junction between the weld face and the base metal — Undercut occurs at the toe.

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