[SV_BubbleTime]

You do not (cannot) weld steel to aluminum.

This looks like aluminum billet to me. And other than the grinder stopping, it looks like it’s cutting exactly like aluminum.

[jeffreyrogers]

Sure, it doesn't really matter if it is steel or aluminum. They are cutting into the plate that is welded to the material. It still appears to stop once it gets through the plate.