Mostly just visual in terms of shine vs matte. For the quality of the joint itself, lead-free has a higher melting point so you need more heat to keep it flowing nicely.
Your joints will do what they’re supposed so, so they’re fine. Chasing perfection is just a fun minigame.
It’s lead free solder. I think that affects how the joints look.
There are lots of LF alloys, some shiny some not. Your joints are fine, regardless of the alloy :)
Mostly just visual in terms of shine vs matte. For the quality of the joint itself, lead-free has a higher melting point so you need more heat to keep it flowing nicely.
Your joints will do what they’re supposed so, so they’re fine. Chasing perfection is just a fun minigame.
Chasing perfection was my sanity back when I was a welder.