IMM Welding & Fabrication 2

Question 1

In the electrode designation E7018, what does the number '70' represent?

Accepted Answer

Minimum tensile strength of the deposited weld metal in ksi

Answer

Electrode diameter in thousandths of an inch

Answer

Recommended welding current in amperes

Answer

Percentage of iron powder in the flux coating

Question 2

What type of oxy-acetylene flame is used when welding cast iron?

Accepted Answer

Carburizing (reducing) flame

Answer

Oxidizing flame

Answer

Neutral flame

Answer

Hydrogen flame

Question 3

What does FCAW stand for?

Accepted Answer

Flux-Cored Arc Welding

Answer

Full-Current Arc Welding

Answer

Flux-Coated Arc Welding

Answer

Forge-Control Arc Welding

Question 4

What is the primary purpose of a backing bar (backing strip) placed behind a weld joint?

Accepted Answer

To support the molten weld pool and ensure full root penetration on single-sided welds

Answer

To preheat the base metal to welding temperature

Answer

To regulate amperage fluctuations during welding

Answer

To prevent warping of thin sheet metal

Question 5

What causes porosity in a completed weld?

Accepted Answer

Gas entrapped in the solidifying weld metal forming voids

Answer

Excessively slow travel speed during welding

Answer

Amperage set too high for the electrode diameter

Answer

Improper groove angle on the joint preparation

Question 6

What travel angle is typically used with a drag technique during flat-position SMAW welding?

Accepted Answer

10–15° from vertical in the direction of travel

Answer

90° perpendicular to the base metal surface

Answer

45° to the direction of travel

Answer

30° away from the direction of travel

Question 7

Which weld joint configuration is formed when two pieces of metal are aligned end to end in the same plane?

Accepted Answer

Butt joint

Answer

T-joint

Answer

Lap joint

Answer

Corner joint