When welding a loop on a jump-ring, the loop can be welded shut with a few welding spots without the risk of damaging the spring. This is a common every day situation that the PUK solves in less than a minute.

Welder used / Verwendetes Schweißgerät: [ Ссылка ]

Welding for goldsmiths and silversmiths: welding a loop / welding a chain
Schweißen für Gold- und Silberschmiede: Öse Schweißen / Kette Schweißen

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