How To Weld Cast Aluminum Engine Block. I have fixed a ton of cast and billet aluminum blocks and headsno mater what process you use the weld area will loose the original heat treati have a Miller aerowave tig welder and it welds so hot and the arc profile is such that you get killer penetration with no pre heat The less heat you have to use the less of an area that you loose the. Aluminum welding has its own cons as it is more prone to cracking.
You can do either OR you -can- mig aluminum but i wouldnt recommend it. For best results clean and bevel the cast iron before welding. For cast iron heads this includes furnace welding flame spray welding or brazing.
I have fixed a ton of cast and billet aluminum blocks and headsno mater what process you use the weld area will loose the original heat treati have a Miller aerowave tig welder and it welds so hot and the arc profile is such that you get killer penetration with no pre heat The less heat you have to use the less of an area that you loose the.
To stop the crack make sure you drill a very small hole at the base of it to keep it from spreading. Pick your poison and go. Its being used in a wide field where submarine- or in general large ship motor blocks have to be repaired eg. The 319 alloy is 858 to 915 aluminum 55 to 65 silicon 3 to 4 copper 035 nickel 025 titanium 05 manganese 1 iron 1 zinc and 01 magnesium.