As someone else mentioned try Zirconiated tungstan. It is a bit spendy but last a lot longer than pure. I was lucky and a couple years ago got to tap into the knowledge of someone that has welded for 40+ years. He became like a father to me and taught me and refined my skills. Gas lense was another suggestion he made. don't worry about the cost, you will recover that cost in savings of argon within just a couple bottles. I have never taken the gas lense back off since I put it on ~2yrs ago. (they do need changed occasionally though).