CPM - Certified Plant Mechanic Welding and Fabrication Techniques Flashcards
6 cards from real CPM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CPM - Certified Plant Mechanic Welding and Fabrication Techniques flashcards as text
What does tensile strength represent for a material used in plant equipment fabrication?
Answer: The maximum stress a material can withstand before fracturing under tension
Tensile strength is the maximum uniaxial stress a material can endure before breaking and is a key specification for selecting structural and pressure-containing materials.
What property does a Rockwell hardness test measure in a metal used in plant fabrication?
Answer: Resistance to permanent surface indentation
Rockwell hardness measures a material's resistance to plastic deformation by pressing a standardized indenter into the surface under a known load.
What is the purpose of annealing a metal part during plant fabrication or repair?
Answer: Soften the metal and relieve internal stresses by controlled heating and slow cooling
Annealing involves heating metal to a specific temperature and cooling it slowly to reduce hardness, relieve residual stresses, and improve machinability and ductility.
What is the fundamental difference between ferrous and non-ferrous metals as classified in plant maintenance?
Answer: Ferrous metals contain iron as a primary element; non-ferrous metals do not contain iron
Ferrous metals—including carbon steel, stainless steel, and cast iron—contain iron as their primary constituent, whereas non-ferrous metals such as aluminum, copper, and brass do not.
What metallurgical phenomenon is responsible for work hardening when a metal is cold-formed or cold-worked?
Answer: Increase in dislocation density due to plastic deformation at room temperature
Cold working increases the number and entanglement of dislocations in the crystal structure, restricting further movement and making the metal harder and stronger.
What type of surface defects can liquid penetrant testing (LPT) reliably detect on a fabricated or repaired plant component?
Answer: Cracks, laps, seams, and other discontinuities open to the surface
Liquid penetrant testing uses a dye that seeps into surface-breaking defects; after removing excess penetrant, a developer draws the dye out to reveal the location and extent of flaws.