This tip will only work if you want to completely remove Devcon Plastic Weld from an armor part, say as if you had catastrophic failure in gluing your shins…)

If you don’t mind removing all the glue from the piece you can throw it in the freezer for a few hours. After that flex it a little and the glue should pop off with a little effort.

Be careful, as I haven’t tested this myself and remember the cold can make your ABS armor fragile.