CWB Module 9 Exam with Correct Answers

CWB Module 9 Exam with Correct Answers Adjacent to the molten metal is a zone that reaches high temperatures, but does not melt? - ️️ Heat affected zone Heating, melting, and solidification (cooling) of metal leave us with two important aspects to consider: - ️️ Metallurgical transformations and stresses and strains may be induced causing distortion and possible cracking The rate at which a lamp converts electrical energy into heat and light is given by: - ️️ current times voltage The units of current times voltage is: - ️️ amps x volts = joules per second (or watts) The proportion of total heat energy that enters the plate is known as: - ️️ Efficiency Which welding process has the highest efficiency? - ️️ Submerged arc welding 90- 99% Which welding process has the lowest efficiency? - ️️ Gas tungsten arc welding 20- 50% The energy input is an important parameter that relates to the - ️️ size of weld, the width of the HAZ, and the cooling time In general the higher the energy input - ️️ the larger the weld, the wider the HAZ, and the slower the cooling rate