Solder Alloys, 1

Common Alloys of Solder with Melting Ranges:

% tin    % lead    % silver    Melting range

20        80                            183-275C    361-527F

30        70                            183-255C    361-491F

40        60                            183-234C    361-453F

50        50                            183-212C    361-414F

60        40                            183-188C    361-370F

63        37                            183-183C    361-361F

62        36            2              179-189C    354-372F

45        54            1              177-210C    351-410F

This shows the solder compositions of lead and tin only have a solidification temperature of 183C.  The proportions of the two metals alter the the melting point and at 63/37 the melting and solidification temperature are the same, making for excellent solder beads.

The addition of silver can reduce the solidification point but the melting point can vary significantly.  Other solder alloys can make significant alterations in the melting and solidification temperatures.

revised 3.12.24