CWS Welding Processes & Techniques

Question 1

After a hermetically sealed can is opened, which SMAW electrode must be kept in a heated holding oven to control moisture pickup?

Accepted Answer

E7018

Answer

E7018 is a low-hydrogen electrode whose coating absorbs moisture, so it must be stored in a holding oven (typically about 250°F minimum) to prevent hydrogen cracking.

Question 2

Which GMAW metal transfer mode has the lowest heat input and is best suited for thin sheet and out-of-position welding?

Accepted Answer

Short-circuiting transfer

Answer

In short-circuiting transfer the wire touches the weld pool many times per second at low voltage and current, giving low heat input.

Question 3

A field crew must weld structural steel outdoors in windy conditions with no wind screens. Which process is most suitable?

Accepted Answer

Self-shielded FCAW (FCAW-S)

Answer

FCAW-S makes its own shielding from the core ingredients, so wind does not blow away an external shielding gas.

Question 4

In GTAW with direct current electrode negative (DCEN), roughly how much of the arc heat goes into the workpiece?

Accepted Answer

About two-thirds

Answer

With DCEN about two-thirds (roughly 70%) of the heat goes into the work, which gives deep penetration and keeps the tungsten cool.

Question 5

Which arc welding process is normally limited to the flat and horizontal fillet positions because of its granular flux blanket?

Accepted Answer

Submerged arc welding

Answer

SAW uses loose granular flux that must lie over the joint, so it is generally restricted to flat and horizontal positions.

CWS - Certified Welding Supervisor Practice Test

CWS - Certified Welding Supervisor Practice Test

CWS Welding Processes & Techniques