is written that when you tig , in this case chrome moly, and you touch tung in the molten puddle ,or the filler rod goes out of the shilding gas( argon), or you don`t use a dedicate wheel when you grind the tung, or your pre and post flow is not apprppriate, contaminations occur. what consequence you are going to have in your weldings even if they show nice and well done?