Certified Welder Welding Processes & Techniques 2

Question 1

Which welding process uses a consumable electrode wire fed automatically through a welding gun with shielding gas supplied externally?

Accepted Answer

GMAW

Answer

GMAW (Gas Metal Arc Welding / MIG) uses a continuously fed consumable wire electrode and externally supplied shielding gas.

Question 2

In submerged arc welding (SAW), the arc is shielded by:

Accepted Answer

A granular flux blanket

Answer

SAW uses a granular flux that completely submerges the arc, preventing spatter and providing excellent shielding.

Question 3

What is the primary advantage of plasma arc welding (PAW) over GTAW?

Accepted Answer

Higher energy density and faster travel speeds

Answer

PAW constricts the arc through a nozzle orifice, producing a higher energy density plasma column that allows faster travel speeds and deeper penetration.

Question 4

Which FCAW mode uses only the flux inside the tubular electrode for shielding with no external gas supply?

Accepted Answer

Self-shielded FCAW

Answer

Self-shielded FCAW (FCAW-S) relies entirely on the flux core of the electrode for shielding, requiring no external gas supply.

Question 5

During GTAW welding of aluminum, which current type is typically recommended?

Accepted Answer

AC (alternating current)

Answer

AC current is used for GTAW on aluminum because the positive half-cycle provides cathodic cleaning action to break up the oxide layer.

Certified Welder Practice Test

Certified Welder Practice Test

Certified Welder Welding Processes & Techniques 2