You can't weld steel 4340/4140/etc to tungsten, so what you're doing is welding a lip to the hole you're filling and making that solid. A TIG welder can put a little weave over those pieces in the crank without even taking it out of the engine. When going to heavier parts, you're often stuck filling holes with weld, vice trying to put tungsten into existing drilled holes where you'll have minimal press.
This isn't best practice, but no need to lose sleep over it once you get it TIG'd. S/F....Ken M
