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Introduction technique; this page will be supplemented with technical information on a regular basis, so as to develop into a focal point of information and possibly a forum for discussion.
The presentation of jewellery; the cosmetic aspect is at least as important as the construction. Finishing surfaces is an extremely important part of the production process. Techniques of grinding, polishing, sandblasting of titanium and gold, and of electrochemical etching and furbishing of (inter alia) stainless steel are being used. A well-chosen finish makes shape more evident. For instance, a matt finish may give away even the tiniest imperfection, a shiny surface may do exactly the opposite.
Joints; pressing, riveting, and vacuum brazing are being used to join parts to one another; in this process jewellery is heated by an induction coil from the outside in a vacuum container made of quartz glass. Depending on the application, there is a vacuum in the container or small quantities of extremely pure argon gas or a mixture of hydrogen and nitrogen are being brought into it, all of it with only one goal: elimination of oxygen. Clearly visible joints may be very important aspects of design, not only in shape but decoratively as well.
|Picture: within a few seconds, the metal is at its melting point. Cooling water is being pumped through the induction coil. The vacuum causes the glass to stay relatively cool. The heat of the metal can dissipate only by infrared radiation.|
Picture: a glowing drop of red gold (5 grams) in the thin atmosphere of hydrogen. After cooling, the drop retains its brilliant finish.
|Picture: cooled. The small cup has condensed; after being heated it has ceramic properties.|
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