I primarily use 3 different Platinum solders 1700, 1500, and 1300. On complex fabrication projects I may also use 1600, and 1400 solders.
For most solder seams where there is a visual break at the seam, I use 1500 solder. This solder provides good strength and with a lower melting point, it is easier to use than the higher temperature solders. There is, however, some color difference from the platinum stock and there may be some solder drag out from polishing. These are slight and on seams where the metal changes direction at the solder joint I prefer its use.
I use 1700 solder for seams that are on a level plane and color match is critical, and where strength is of utmost importance, such as sizing rings. This solder melts at a temperature less than 50 degrees lower than platinum and you need to exercise precise torch control to keep from melting the platinum surrounding the solder seam.
Although many jewelers look down their nose at using 1300 platinum solder, it has become one of my favorites. Because of its low melting temperature very fine and delicate wires can be easily soldered without the fear of melting. However, to me 1300 platinum solder’s greatest advantage is its polishing drag out. Regardless of how little solder you use, platinum solders will fill a seam and will leave evidence of its existence on the surface of the metal. On all solder seams where I want the results to look like there is no solder such as soldering a wedding set together, 1300 solder is my preferred choice. It will securely join two pieces of platinum together and after polishing it will be hard to tell there is any solder present.
On complex fabrication projects I may also use 1600 or 1400 solders to add additional temperature variance between steps. Because of the minimal heat transfer in platinum this is seldom a concern, however there are times when they are needed.
Brad
