Welding Discontinuities Quiz

Where can hydrogen-induced cold cracking occur?

• Only in the weld metal

• Only in the heat-affected zone

• In the weld metal or the heat-affected zone

• In the base metal

What type of cracks are usually observed in the heat-affected zone?

• Transverse cracks

• Longitudinal cracks

• Toe cracks

• Crater cracks

How are fine micro-cracks usually detected?

• By visual examination

• By nondestructive methods

• By ultrasonic testing

• By magnetic particle testing

When should nondestructive examination be carried out after completion of the welds?

• 48 hours later

• 24 hours later

• 72 hours later

• Immediately

What are design-related discontinuities attributed to?

• Improper welding conditions

• Incorrect weld metal composition

• Problems within the design of the structural details

• Defective properties of the base metal

What mechanical properties may be defective if procedures are not followed?

• Tensile strength, yield strength, ductility

• Tensile strength, yield strength, corrosion resistance

• Hardness, impact, corrosion resistance

• Ductility, hardness, impact

What may result in lack of corrosion resistance in weldments?

• Improper welding conditions

• Incorrect welding procedures

• Defective properties of the base metal

• High hydrogen level

What should be done if there are problems with the base metal?

• The entire weldment should be re-welded

• The base metal should be repaired

• Only the welded joint should be removed

• The entire weldment may not be acceptable for use

What is the purpose of the exam exercise in the study guide?

• To assess the student's prior knowledge

• To provide extra credit for the student

• To give an indication of whether the student has learned the material

• To test the student's speed in completing the module

What is the recommended approach for studying the text?

• Read the text quickly and move on to the next section

• Underline sections when reading

• Highlight important sections on the first read

• Read each section three times thoroughly before highlighting anything