Face cutting both would be easiest and a start point.

Some studies of 'welded' surfaces would be useful, however, just like with the Hutchinson fused dissimilar materials and the filing cabinet from 911 (apparently managed to 'melt' but not burn paper) I would expect them to only have inter-metallics or alloys where pure metals interacted, and even then rarely.

Just look at how that thing 'melted', kind of like scrunched up, but in a plastic amorphous way. I used to run a burger stall on a Sunday for years, with a charcoal barbecue in half of an oil drum - I never saw anything like this.