Tubular upper a-arms - Should I be worried?

Good info. Let's not hijack too much. Metals will discolor but a grey or sooty colored weld, is either from lack of shielding has or too much heat. As mentioned, heat is the enemy to metals...that's why everything I TIG is manually pulsed with my foot so that when I am not needing the heat, it is not being out into the metal. Back on topic...sorry.