IMM Welding & Fabrication

Question 1

Which welding process uses a consumable electrode covered with a flux coating?

Accepted Answer

SMAW (Stick welding)

Answer

GMAW (MIG welding)

Answer

GTAW (TIG welding)

Answer

FCAW (Flux-Cored Arc Welding)

Question 2

What is the primary purpose of preheating steel before welding?

Accepted Answer

To reduce the risk of hydrogen-induced cracking

Answer

To increase welding travel speed

Answer

To improve the cosmetic appearance of the weld bead

Answer

To lower the required amperage setting

Question 3

Which shielding gas is standard for GTAW (TIG) welding of stainless steel?

Accepted Answer

100% Argon

Answer

100% CO2

Answer

75% Argon / 25% CO2

Answer

100% Helium

Question 4

What does 'duty cycle' mean when referring to welding equipment?

Accepted Answer

The percentage of a 10-minute period a machine can weld at a rated output without overheating

Answer

The number of electrodes consumed per hour of operation

Answer

The amperage required for a specific electrode diameter

Answer

The frequency of scheduled preventive maintenance intervals

Question 5

Which weld defect is a groove melted into the base metal along the toe of the weld that is left unfilled by weld metal?

Accepted Answer

Undercut

Answer

Porosity

Answer

Slag inclusion

Answer

Overlap

Question 6

What is the purpose of back purging with argon when TIG welding stainless steel pipe?

Accepted Answer

To prevent oxidation on the inside (root) surface of the weld

Answer

To accelerate the cooling rate of the weld

Answer

To increase penetration depth

Answer

To reduce weld spatter

Question 7

What is the correct polarity when welding with an E7018 low-hydrogen electrode?

Accepted Answer

DCEP (Direct Current Electrode Positive)

Answer

AC (Alternating Current)

Answer

DCEN (Direct Current Electrode Negative)

Answer

High-frequency AC