CPM CPM - Certified Plant Mechanic Welding and Fabrication Techniques

Question 1

What does the acronym MIG stand for in the MIG welding process?

Accepted Answer

Metal Inert Gas

Answer

Manual Iron Grind

Answer

Magnetic Induction Gun

Answer

Metal Ionization Gauge

Question 2

What shielding gas mixture is most commonly used when MIG welding mild steel in a plant maintenance setting?

Accepted Answer

75% argon / 25% CO2 (C25)

Answer

Pure argon

Answer

Pure CO2

Answer

Helium and nitrogen blend

Question 3

Which welding process uses a non-consumable tungsten electrode and is best suited for precision welds on stainless steel and aluminum?

Accepted Answer

GTAW (TIG)

Answer

SMAW (Stick)

Answer

FCAW (Flux-Cored)

Answer

SAW (Submerged Arc)

Question 4

In SMAW (Stick) welding, what is the primary function of the flux coating on the electrode?

Accepted Answer

Protect the weld pool from atmospheric contamination

Answer

Conduct electricity to the base metal

Answer

Preheat the base metal

Answer

Act as filler metal only

Question 5

What is the purpose of preheating base metal before welding in plant maintenance applications?

Accepted Answer

Reduce the risk of hydrogen cracking in high-carbon or thick materials

Answer

Increase electrode burn-off rate

Answer

Speed up weld pool solidification

Answer

Lower the required shielding gas flow rate

Question 6

What does PWHT stand for and when is it typically required in plant fabrication?

Accepted Answer

Post Weld Heat Treatment; used to relieve residual stresses and improve toughness after welding

Answer

Pre-Weld Handling Technique; used to clean metal before welding

Answer

Partial Weld Heat Test; a non-destructive test method

Answer

Pressurized Weld Hardness Test; used to measure weld hardness