Question

identify the following weld defect.

whiskers
undercut
cold start
cracking
porosity

Explanation:

Analyze the visual evidence

The image shows a close-up of a weld joint inside a pipe or groove. A distinct piece of electrode wire is visible protruding completely through the root of the weld joint to the inside of the pipe/structure. This specific defect occurs in Gas Metal Arc Welding (GMAW) when the welding wire advances faster than the arc can melt it, pushing the unmelted wire through the root opening where it remains trapped and exposed on the root side.

Identify the defect name

Using the Welding Defects knowledge point

• Whiskers: This term refers specifically to short lengths of electrode wire that extend through the root of a groove weld, exactly as shown in the image.
• Undercut: A groove melted into the base metal adjacent to the weld toe or root and left unfilled.
• Cold start: Lack of fusion at the beginning of a weld pass due to insufficient heat.
• Cracking: A fracture-type discontinuity.
• Porosity: Gas pockets or cavities.

Therefore, the defect shown is "Whiskers".

Answer:

• Whiskers (Correct answer)
• Undercut
• Cold start
• Cracking
• Porosity