Meisterprüfung Spengler Practice Questions - Meisterprüfung Für Das Handwerk Spengler (Austrian Master Craftsman Examination In Sheet Metal & Tinsmithing) Exam

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According to ÖNORM B 3521 and EN 988 guidelines, what is the minimum permissible material temperature for folding, bending, and seaming titanium zinc on a construction site without preheating?

-5 °C (as long as folding machines are lubricated with oil) +0 °C (freezing point of water) +10 °C (material temperature; below which folding causes brittle micro-cracking / Sprödbruch unless preheated with warm air) +25 °C (room temperature required for all bending operations)

Correct Answer:

+10 °C (material temperature; below which folding causes brittle micro-cracking / Sprödbruch unless preheated with warm air)

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