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Aluminum can be welded with reverse polarity DC, but it takes very large and expensive tungsten electrodes, very expensive helium and a large water cooled torch.
That is how they used to tig weld aluminum in the 50s and 60s back before advanced welding inverter technology. They did have motor generator welders for higher frequency 100 to 1000Hz A/C and high frequency arc stabilizes for 60Hz welding, but helium and big tugsten was cheap so none of that really caught on until the 80's or 90's.
Most automotive alternators appear to be 6 or 12 pole.
Wye can only put out more amps than delta if it's a 4 wire wye. Other wise all your hifjer amp rated stuff appears to be delta. For example if you can add a neutral to a 3 wire wye connected transformer those power wires can handle something like 74% more power.
Going 4 wire makes wye a totally different animal.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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