WCL Welding Processes & Techniques 5

Question 1

What is 'spray transfer' in GMAW, and what shielding gas is required for it?

Accepted Answer

A stream of fine droplets axially transferred across the arc, requiring at least 80% argon in the shielding gas

Answer

Spray transfer produces a smooth stream of fine droplets across the arc and requires a shielding gas with at least 80% argon to achieve the transition current threshold.

Question 2

Which document governs qualification of welding procedures and welders for most structural steel work in the US?

Accepted Answer

AWS D1.1 Structural Welding Code — Steel

Answer

AWS D1.1 is the primary structural welding code for steel in the US, governing WPS qualification, welder qualification, and inspection requirements.

Question 3

What does 'PWHT' stand for, and what is its primary purpose in welding?

Accepted Answer

Post-Weld Heat Treatment; relieves residual stresses and tempers the HAZ after welding

Answer

PWHT (Post-Weld Heat Treatment) involves controlled heating and cooling of the completed weld to relieve residual stresses and improve HAZ toughness.

Question 4

In SMAW, what does the last two digits of an electrode classification (e.g., E7018) indicate?

Accepted Answer

The type of coating and usable welding current

Answer

The last two digits of an SMAW electrode classification indicate the type of flux coating and the compatible welding current (AC, DC+, DC-).

Question 5

What is the purpose of a 'root opening' (root gap) in a groove weld joint?

Accepted Answer

To allow access for the root pass to achieve complete joint penetration

Answer

The root opening provides space at the bottom of the groove so the welder can achieve complete joint penetration with the root pass.

(WCL) Welding Certification Los Angeles Practice Test

(WCL) Welding Certification Los Angeles Practice Test

WCL Welding Processes & Techniques 5