Certified Welder Welding Processes and Equipment Questions and Answers

Question 1

A welding machine is rated at 300 amps with a 60% duty cycle. How long can this machine weld continuously at 300 amps before it requires a cooling period, based on a standard 10-minute cycle?

Accepted Answer

6 minutes

Answer

3 minutes

Answer

4 minutes

Answer

10 minutes

Question 2

When performing Gas Tungsten Arc Welding (GTAW) on aluminum, which type of current and tungsten electrode tip preparation is most commonly recommended?

Accepted Answer

AC with a balled tip

Answer

DCEN with a pointed tip

Answer

DCEP with a balled tip

Answer

AC with a pointed tip

Question 3

A welder is setting up for Gas Metal Arc Welding (GMAW) on carbon steel using the short-circuit transfer method. Which of the following shielding gases would be most appropriate for this application?

Accepted Answer

75% Argon / 25% Carbon Dioxide

Answer

100% Argon

Answer

90% Argon / 10% Helium

Answer

100% Helium

Question 4

Which of the following welding processes uses a non-consumable electrode?

Accepted Answer

Gas Tungsten Arc Welding (GTAW)

Answer

Shielded Metal Arc Welding (SMAW)

Answer

Flux-Cored Arc Welding (FCAW)

Answer

Gas Metal Arc Welding (GMAW)

Question 5

In Shielded Metal Arc Welding (SMAW), selecting DCEN (Direct Current Electrode Negative) polarity generally results in:

Accepted Answer

Shallower penetration and a higher deposition rate.

Answer

Deeper penetration and a lower deposition rate.

Answer

Shallower penetration and a lower deposition rate.

Answer

Deeper penetration and a higher deposition rate.

Question 6

A welder needs to join thick sections of carbon steel in an outdoor, windy environment. Which welding process would be the most suitable choice, considering its robustness and the minimal need for external shielding gas?

Accepted Answer

Self-shielded Flux-Cored Arc Welding (FCAW-S)

Answer

Gas Tungsten Arc Welding (GTAW)

Answer

Gas Metal Arc Welding (GMAW) with spray transfer

Answer

Submerged Arc Welding (SAW)

A welding machine is rated at 300 amps with a 60% duty cycle.How long can this machine weld continuously at 300 amps before it requires a cooling period, based on a standard 10-minute cycle?

A welding machine is rated at 300 amps with a 60% duty cycle.
How long can this machine weld continuously at 300 amps before it requires a cooling period, based on a standard 10-minute cycle?