IMM Welding & Fabrication 3

Question 1

In the electrode classification E7018, what does the last digit '8' indicate?

Accepted Answer

The coating type and compatible current/polarity

Answer

The last digit of an SMAW electrode classification designates the flux coating composition and specifies which current types and polarities are compatible.

Question 2

Which NDT method magnetizes ferromagnetic components and uses iron particles to reveal surface and near-surface discontinuities?

Accepted Answer

Magnetic particle testing (MT)

Answer

Magnetic particle testing (MT) induces a magnetic field in ferromagnetic material; particles accumulate at flux leakage points caused by surface or near-surface defects.

Question 3

What is the purpose of a weld test coupon?

Accepted Answer

To qualify a welding procedure or certify a welder's proficiency

Answer

A weld coupon is a test piece used to qualify Welding Procedure Specifications (WPS) or to certify welders by evaluating weld quality and mechanical properties.

Question 4

What is the primary advantage of GTAW (TIG welding) compared to GMAW (MIG welding)?

Accepted Answer

Superior weld quality and precise control, especially on thin materials and reactive alloys

Answer

GTAW provides a cleaner, more controllable arc with no spatter and independent control of heat and filler metal, making it ideal for thin sections, stainless steel, and aluminum.

Question 5

What are the primary goals of post-weld heat treatment (PWHT)?

Accepted Answer

To relieve residual stresses and improve heat-affected zone toughness

Answer

PWHT heats the welded assembly to a specified temperature and holds it there to reduce residual stresses, temper hard microstructures, and improve toughness and corrosion resistance.

IMM - Industrial Maintenance Mechanic Certified Practice Test

IMM - Industrial Maintenance Mechanic Certified Practice Test

IMM Welding & Fabrication 3