[wongarsu]

In the sense that everything is chemicals, yes. But you typically wouldn't describe a butterfly growing a wing or a welder making a blue weld from metals that are normally very much not blue as "growing from chemicals". I guess you could argue about the butterfly, but I think few people would say that chemicals are involved in welding steel, despite iron, carbon and tungsten being chemical elements

[defrost]

The few people that would say that chemistry is part of welding "steel" (what type of steel? what type of metal? how about aluminium? etc) includes welders.

eg: https://youtu.be/nfNvuTMDXNg?t=1420

In which a good machinist from Queensland, Australia discovers a crack and states he'll have to get the metal tested before he can repair the crack.

You know, to match the chemical composition, expansion rates, etc.