AWS AWS Welding Processes & Equipment 4

Question 1

In flux-cored arc welding (FCAW), what is the primary difference between FCAW-S and FCAW-G?

Accepted Answer

FCAW-S is self-shielded requiring no external gas while FCAW-G requires external shielding gas

Answer

FCAW-S (self-shielded) generates its own shielding from flux compounds inside the tubular wire, while FCAW-G (gas-shielded) requires an external shielding gas supply.

Question 2

Which welding process uses a non-consumable tungsten electrode and is best suited for welding thin aluminum sections?

Accepted Answer

GTAW

Answer

Gas tungsten arc welding (GTAW/TIG) uses a non-consumable tungsten electrode and provides precise heat control ideal for thin aluminum.

Question 3

What is the purpose of a contactor in a welding power source?

Accepted Answer

To energize the welding output terminals only when the arc is struck or the torch trigger is pressed

Answer

A contactor is a high-current switch that keeps the welding output terminals de-energized until the welder initiates an arc, improving operator safety.

Question 4

During submerged arc welding (SAW), what function does the granular flux serve?

Accepted Answer

It shields the arc and weld pool from atmospheric contamination and can add alloying elements

Answer

In SAW, the granular flux completely covers the arc and molten pool, protecting it from the atmosphere and potentially contributing alloying elements to the weld.

Question 5

A welding power source rated at 300A/32V with a 60% duty cycle can be used continuously at rated output for how many minutes out of every 10-minute period?

Accepted Answer

6 minutes

Answer

A 60% duty cycle means the machine can operate at rated output for 60% of a 10-minute period, which equals 6 minutes on and 4 minutes off.

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AWS AWS Welding Processes & Equipment 4