4TH CLASS POWER ENGINEERING UNIT A6 CHAPTER 2 INTRODUCTION TO WELDING QUESTIONS AND ANSWERS WITH SOLUTIONS 2024/25

To prevent rapid cooling of the HAZ during welding, the entire area surrounding the weld joint can be: Select one: a. preheated in a furnace or with hand held torches b. re-heated with a process known as post weld heat treatment c. kept under a heating zone during the welding process d. pre-heat the welded area to about 5500 C - ANSWER a When brought into an oxygen rich atmosphere, steel will burn at: Select one: a. 870 C b. 5070 C c. 6700 C d. 3300 C - ANSWER a The process to reheat the hardened metals and then cooling metal rapidly by dipping metal in oil is known as: Select one: a. quenching b. smoldering c. refining d. controlled cooling - ANSWER a Which of the following is the colour for an acetylene hose: Select one: a. red b. green c. blue