When joining multiple pieces of silver, it is crucial to plan out the sequence in which the pieces will be joined. If several joints need to be placed in close proximity, it is wise to use several grades of solder. The sequence of solder joints should run from the hardest grade of solder being used first, to the softest grade last.
Once a joint is soldered, it will take more heat to melt the solder a second time. This is because some of the zinc that is commonly used in solder will be vapourised during soldering, and repeated heating will result in a solder alloy that is harder as it becomes more like the surrounding silver. With experience, this effect can also be utilised when working on adjacent solder joins.
