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What types of metal tubing can be expanded with this set?
This kit is explicitly designed for soft copper pipes commonly utilized in HVAC and air conditioner installations. Do not attempt to use these bits on hard copper or rigid steel pipes, as this can degrade or damage the HHS steel tips.
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How does the friction-based swaging mechanism work?
When coupled with an active hand drill, the flat, blunt spade tip rotates inside the soft copper pipe. This rotation generates localized friction heat, allowing the metal to soften and gently expand to the designated inner diameter without splitting or requiring expensive external copper couplings.
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Are there any precautions regarding speed and temperature?
Yes. Keep the drill rotation at a moderate, controlled speed; spinning too quickly can cause thermal over-stress. Additionally, because the expansion relies entirely on heat generated by friction, the pipe and bit will become extremely hot. Always wear safety goggles and anti-scalding gloves during operation.