[Modena]

I watched a short youtube video once of a guy showing how to weld thin car panels, and apparently a similar technique can be used on al. Basically squeeze and release, move ~5mm, squeeze and release, doing this quickly to retain heat, so its really an ongoing overlapping line of spot welds. Comes out in a pretty nice stack of dimes if you do it well. I've only done this on steel, never tried al (yet)