Not sure why this is happening, but here goes. Before I can get even a spot weld started the tips are burning off. I mean these are actually welding/burning off before I can get a bead started. This morning I went through 5 tips with not even a 1/2″ of weld. I’ve checked everything. Changed settings, unhooked spool gun and reassembled, changed argon flow, etc. Nothing works. I have used this gun before, so it’s not like it’s brand new and it has worked. Just haven’t used it very much. My first thought is something went wrong with the gun. Any thoughts from anyone? I really need this gun to work. Please help.