… or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings …
Explanatory notes
… or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings … to facilitate certain operations. The pickling process may be a finishing operation, or may be effected at an … metal and other materials . These preparations are used to make the metal surfaces to be joined adhere to each other. …