My kid went to welding summer camp when he was 8. 12 kids, one instructor; they learnt welding, brazing, soldering, other stuff I don't know the English for. Everyone had a good time and made some amazing things. Nobody suggested there was anything to worry about, but then again those parents wouldn't have signed their kids up. But I never met German parent who were particularly paranoid.

German kids videos and books can be really good too, like the 'was ist was' series that, say, really shows you how internal combustion engines work. I say "can be" because there's a lot of crap there too.