AWS Submerged Arc Welding (SAW) 4

Question 1

In SAW, what is the primary purpose of the flux layer covering the arc?

Accepted Answer

To shield the arc and molten pool from atmospheric contamination

Answer

The flux layer completely submerges the arc, protecting the weld from oxygen and nitrogen contamination while also stabilizing the arc.

Question 2

Which SAW parameter has the greatest influence on weld bead width?

Accepted Answer

Arc voltage

Answer

Arc voltage primarily controls weld bead width in SAW; higher voltage produces a wider, flatter bead.

Question 3

What type of current is most commonly used for single-wire SAW to achieve deep penetration?

Accepted Answer

DCEP (electrode positive)

Answer

DCEP provides the deepest penetration in SAW because more heat is concentrated at the work piece.

Question 4

What is 'flux consumption ratio' in SAW?

Accepted Answer

The ratio of flux melted to wire melted by weight

Answer

Flux consumption ratio (typically 1:1) is the weight of flux consumed relative to the weight of wire consumed during welding.

Question 5

When welding with tandem SAW electrodes, what is the typical relationship between the two arcs?

Accepted Answer

Lead arc uses DCEP for penetration; trail arc uses AC for fill and bead shape

Answer

Tandem SAW typically uses DCEP on the lead wire for deep penetration and AC on the trailing wire to improve deposition and bead shape while reducing arc blow.

AWS Practice Test

AWS Practice Test

AWS Submerged Arc Welding (SAW) 4