WCL Welding Processes & Techniques 3

Question 1

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

Accepted Answer

FCAW-S is self-shielded; FCAW-G requires external shielding gas

Answer

FCAW-S is self-shielded (flux in the core provides shielding), while FCAW-G requires an external shielding gas for protection.

Question 2

What is the correct direction of travel for SMAW to prevent slag inclusions?

Accepted Answer

Keep the electrode angle so slag stays behind the arc, not ahead of it

Answer

Proper electrode angle ensures slag flows behind the arc; if slag runs ahead, it becomes trapped and causes inclusions.

Question 3

Which AWS filler metal classification is used for mild steel GTAW (TIG) welding?

Accepted Answer

ER70S-6

Answer

ER70S-6 is the most common solid wire/filler rod for TIG welding mild (carbon) steel, offering good deoxidizer content.

Question 4

What is 'undercutting' in a weld, and what causes it?

Accepted Answer

A groove melted into the base metal along the weld toe, caused by excessive heat or improper angle

Answer

Undercutting is a notch melted into the base metal at the weld toe, typically caused by excessive current, improper electrode angle, or fast travel speed.

Question 5

For plasma arc cutting (PAC), which gas is typically used as the plasma gas for cutting carbon steel?

Accepted Answer

Nitrogen or compressed air

Answer

Nitrogen or compressed air is commonly used as the plasma gas for cutting carbon steel due to cost-effectiveness and clean cut quality.

(WCL) Welding Certification Los Angeles Practice Test

(WCL) Welding Certification Los Angeles Practice Test

WCL Welding Processes & Techniques 3