Welder Red Seal · Question
Which of the following is an essential condition, in addition to a susceptible microstructure and a source of hydrogen, for hydrogen-induced cracking (HIC) to occur?
The 'triangle of cracking' for HIC involves three necessary conditions: a source of diffusible hydrogen (from moisture, etc.), a susceptible, hardened microstru
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Question: Which of the following is an essential condition, in addition to a susceptible microstructure and a source of hydrogen, for hydrogen-induced cracking (HIC) to occur?
Answer options:
- High travel speed
- Low ambient temperature ✅ Tensile stress
- Alternating current
Correct answer: Tensile stress
Explanation: The 'triangle of cracking' for HIC involves three necessary conditions: a source of diffusible hydrogen (from moisture, etc.), a susceptible, hardened microstructure (like martensite), and tensile stresses (residual or applied) to drive crack propagation.
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Question explanations
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