Guy at a Ohio fair told me my Russian forge weld was 'too clean' and it stuck with me
Was doing a demo at a county fair outside Dayton about 5 years back, just running basic billet welds on a coal forge I built from a brake drum. This older guy watched me for maybe 20 minutes without saying a word, then told me my welds looked 'too clean' and that he could tell I was scarfing too much and hiding bad heat. I was kind of annoyed at first but he showed me the tell on his own knife, tiny gray line right at the seam you only see under a low light. He said he was a farrier for 30 years and burned through so many bad welds he could spot one from five feet away. Now I always check my billets with a flashlight at a low angle before I ever move to the next heat. Anyone else had someone clock a flaw in their work just by looking? Curious if that low light trick is something other smiths actually use.
That would've bugged me too, but sounds like the old guy actually did you a favor. Getting called out by someone who's seen thousands of welds is way better than finding out the hard way when a blade snaps. The flashlight thing is real, my mentor showed me the same trick years ago and it catches stuff you'd never see in normal shop light.