... special protection, so it is quite easy with equipped tools.2.It's don't need other energy , ... joined, are located in the Weld Cavity as shown, and the Mold is closed. A steel Retaining Disc ( ... the crucible, to retain the Weld Powder (8) and Starting Power (9) which are poured in on the ... copper alloy. This instantaneously melts the retaining disc, and flows down the tap hole, to the weld cavity, where ...