CWI Fundamentals Tech 5

Question 1

Which type of weld discontinuity is described as a groove melted into the base metal adjacent to the weld toe?

Accepted Answer

Undercut

Answer

Undercut is a groove or channel melted into the base metal at the weld toe, reducing the effective throat and creating a stress concentration.

Question 2

What is the significance of the 'A number' classification in AWS filler metal standards?

Accepted Answer

Classifies deposited weld metal chemical composition

Answer

The A-number system classifies deposited weld metal according to chemical composition, primarily used for stainless steel and alloy filler metals.

Question 3

During visual inspection, a CWI finds a crater crack at the end of a weld. What is the most likely cause?

Accepted Answer

Improper termination of the arc without filling the crater

Answer

Crater cracks form when the arc is extinguished abruptly, leaving an unfilled, rapidly cooling crater that cracks as it shrinks.

Question 4

Which AWS electrode classification represents a low-hydrogen SMAW electrode?

Accepted Answer

E7018

Answer

E7018 is a low-hydrogen electrode (indicated by the '8' suffix), requiring controlled storage to prevent moisture absorption.

Question 5

What is the function of the flux coating on an SMAW electrode?

Accepted Answer

To provide shielding gas, deoxidizers, and slag for weld protection

Answer

The flux coating generates shielding gases to protect the molten weld pool, provides deoxidizers, and forms a slag blanket that protects the solidifying weld.

CWI Practice Test

CWI Practice Test

CWI Fundamentals Tech 5