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CWB Welding Inspector Level 3 Study Guide
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CWB Welding Inspector Level 3 Study Guide
- Which of the following metals has the highest thermal conductivity?
(a) carbon steel (b) stainless steel (c) aluminum
Answer: (c)
- The Ellingham diagram
(a) is a plot of thermal conductivity against temperature, (b) shows the free energy of oxide formation against temperature.(c) shows the rate of oxidation of metals against temperature.
Answer: (b)
- True or False?
A metal with a high negative free energy of oxide formation will generally require greater shielding from the atmosphere during welding.
Answer: True
4. Electricity can be conducted by:
(a) atoms and electrons.(b) electrons and ions.(c) only ions.
Answer: (b)
- Which of the following elements is often present in submerged arc fluxes to improve arc
stability?(a) copper (b) potassium (c) nickel (d) tungsten
Answer: (b)
- Thoria is added to tunsten electrodes for what purpose?
Answer: To increase thermionic emission by lowering the work function.
- True or False?
All pure metals have the same crystal structure.
Answer: False. Metals generally have one of three basic structures.
- Which crystal structure(s) is (are) composed of close-packed planes?
Answer: FCC and HCP
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