The results show that silver based electric materials ought to be smelted by graphite crucible, the clay crucible is suitable for smelting silver based solder.

Influence of Sn and in in silver filler metal on spreadability and joint strength is studied. Microstructure of filler metals and the mechanism of effect of Sn and in are analyzed.

The existential states of bismuth in silver filler metals is also analyzed. And the continuous course of phase transition is studied. The mechanism of the influence is revealed.