Welding Certification — Knowledge Practice
Metallurgy and procedures: practice questions
Our Welding Knowledge bank has 19 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
Which property describes a metal's ability to deform without breaking?
- Hardness
- Ductility
- Conductivity
- Brittleness
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B. Ductility — Bend tests check ductility.
Question 2
What is interpass temperature?
- The temperature of the finished weld after cooling overnight to room temperature
- The electrode temperature
- The temperature of the shop
- The temperature of the weld area between passes in a multi-pass weld
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D. The temperature of the weld area between passes in a multi-pass weld — Procedures may set minimum and maximum interpass temperatures.
Question 3
What is preheating used for?
- To cool the weld faster
- To change the color
- To reduce cooling rate and lower the risk of cracking in thick or high-carbon steels
- To clean the metal
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C. To reduce cooling rate and lower the risk of cracking in thick or high-carbon steels — Preheat temperatures are specified in procedures.
Question 4
Why is aluminium harder to weld than steel in some ways?
- It conducts heat quickly and has a tough oxide layer that melts at a higher temperature
- It melts at a higher temperature than steel
- It is magnetic
- It cannot be welded
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A. It conducts heat quickly and has a tough oxide layer that melts at a higher temperature — AC GTAW or pulsed GMAW is often used.
Question 5
Which code is commonly used for structural steel welding in the U.S.?
- API 1104
- AWS D1.1
- ASME Section IX
- NFPA 70
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B. AWS D1.1 — ASME IX covers pressure equipment; API 1104 covers pipelines.