[exabrial]

One may need to use an angle grinder correctly in a video to convince me. The demo where they plunge the angle grinder straight into the material is no different than the effect on hardened steel. Typically you would start at an edge to minimize the contact area of the cut. That's why lock shackles are rounded.

[SV_BubbleTime]

Yea. I can absolutely guarantee they wouldn’t get nearly as far as they did with a really hard steel like 600-series stainless (Inconel).

I’m certain this is a novel approach with their “jelly filled with nuggets” but it’s still jelly... let me know when they embed nugget in steel.

[jeffreyrogers]

I think they are cutting into the steel plate that they welded to it. Doesn't look like they get that far into the actual material. I agree with the point about using the grinder correctly though.

[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.