Thanks for sharing! I think it might help to study welding a bit more, good welds vs. bad welds. Unless you're intentionally trying to emulate a certain look? What's your welding reference? It looks a bit to blobby to me, so I did a quick web search of "good weld bad weld" and found some examples that might help:
Your problem is on modelling side. I see same huge shading gradients on your mesh too. And while normal map can theoretically counter-measure them in a perfectly "synced" workflow you would never get it looking perfectly right in actual game anyway . 8 bit normal map with compression just doesn't have enough precision for…
Outside application and or plugin, probably best since some time has past to jot this issue down for a later date to review and look into for next time and just go ahead and manually do it, this is a good example of why planning ahead is important. Blender might help with this idk about blender to much though & jumping…