I have a friend that works as a weld inspector that is good to bounce with, and one needs to keep a little track on things to get them good. But when done well they're not difficult to do and get without flaws. They're welded with stainless sticks to annealed steel, ><-ground joints, slow cooldown, works well and no cracks post HT ever, confident on their strength. And as I will grind them in from both sides I will always spot a flaw and be able to fix.
One tricky weld to pull off though was when I recently made a little hammer in soft steel, with welded on "hss1" tip to act as a carbide straightening hammer. Preheated the iron hammer head to full red, quick set and weld with stainless, and into stainless foil and ramp to austenitize all in one go without it cooling down