MT L2 question of the day · 14 November 2026

Today's MT L2 practice question

Types of Discontinuities

After a structural repair weld on a steel member, MT shows a tight cluster of short, fine cracks inside a spot about 6 mm across on the base metal, 40 mm from the weld toe. The fabricator confirms the electrode holder was briefly struck there to start an arc. What is the most likely cause?

Crater cracking left where a weld bead was stopped and the arc was brokenIncomplete fusion along the boundary between adjacent weld passesA hard, brittle spot made by quick heating and chilling at the strikeStress-corrosion cracking from exposure to a process chemical

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Today's MT L2 practice question

After a structural repair weld on a steel member, MT shows a tight cluster of short, fine cracks inside a spot about 6 mm across on the base metal, 40 mm from the weld toe. The fabricator confirms the electrode holder was briefly struck there to start an arc. What is the most likely cause?

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