CWB Welding Inspector Level III Study Guide 2024/2025 With Complete Solutions.

CWB Welding Inspector Level III Study Guide 2024/2025 With Complete Solutions. Which of the following metals has the highest thermal conductivity? (a) carbon steel (b) stainless steel (c) aluminum - Correct 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. - Correct 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. - Correct Answer-True Electricity can be conducted by: (a) atoms and electrons. (b) electrons and ions. (c) only ions. - Correct 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 - Correct Answer-(b) Thoria is added to tunsten electrodes for what purpose? - Correct Answer-To increase thermionic emission by lowering the work function. True or False? All pure metals have the same crystal structure. - Correct Answer-False. Metals generally have one of three basic structures. Which crystal structure(s) is (are) composed of close-packed planes? - Correct AnswerFCC and HCP The real strength of metals is lower than the theoretical value because: (a) real crystals always fracture along specific crystal planes. (b) grain boundary sliding occurs. (c) the presence of dislocations facilitates slip. - Correct Answer-(c).