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- * Aluminum can burst into bright
- flame and self-destruct.
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- So, to weld aluminum, you have
- to work a bit differently.
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- Let's do a practice session on a
- typical application.
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- STEP 1
- Get a housing from a small
- transmission, a motorcycle or
- moped engine casing or a washing
- machine gear box. Clean an area
- to weld some beads. Aluminum
- must not only be clean, but must
- be sanded or filed to remove an
- invisibe thin layer of oxide
- that forms. This should be done
- just moments before welding.
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- STEP 2
- Support the piece to be welded
- from underneath as well as by
- its edges. Use blocks of steel
- as furniture. Unsupported
- aluminum often sags and warps
- out of shape when welded.
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- STEP 3
- Light the torch using less gas
- velocity and one size larger tip
- than you would for steel. Normal
- gas velocity would blow light
- weight liquid aluminum away.
- Less gas velocity does not work
- with steel because the sparks
- would backfire the flame, but
- aluminum creates no sparks.
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