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

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 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.