Final answer:
The coatings of fluxes used in welding can contain metal particles, flux residue, oxidation products, and welding fumes.
Step-by-step explanation:
The coatings of several types of fluxes used in welding contain different substances. Some of the substances found in these coatings include:
- Metal particles: Fluxes may contain small metal particles that can help with the welding process.
- Flux residue: Fluxes leave behind a residue after welding, which helps protect the weld from oxidation.
- Oxidation products: During the welding process, oxidation reactions can occur, and the coatings of fluxes may contain the resulting oxidation products.
- Welding fumes: When welding, fumes can be generated, including those from the fluxes used.