I use the german spotwelder of Lampert Werktechnik GmbH. It is an
electric welder that pulls back the tip and this way prevents it from
sticking to the metal. They have a website www.Lampert.info. I took a
big risk with the welder as it was new on the market, but it payed
out. I use it for tacking together and repairs as well. Obviosly it
is best on gold or Platinum but it works satisfactory on silver.