Low Temperature Characteristics of Lead - free Welded

Lead-free solder used in the solder composition is not the same, resulting in a lot of low-temperature characteristics of natural difference. Pure tin in the case of less than -13 degrees will produce the phenomenon of tin epidemic, solder into a gray tin, the texture of the powder, in the event of tin, rapid infection, making the welding of good components desoldering, can not be restored, in fact, This phenomenon occurs in early solar cell modules, especially in alpine regions, where the ambient temperature is below -40 degrees, and in extreme cases it will reach -60 degrees, and the number of solder in general will lead to gray tin, resulting in component output Power drop, gray tin caused by the power drop is irreversible.

     There are many solutions to the phenomenon of gray tin, a more mature program is to add metal bismuth in the solder, metal bismuth extra electrons in the low temperature tin in the replacement, so as to avoid the occurrence of tin epidemic.

     I prepared the company's tin silver copper bismuth lead-free quaternary solder fully consider the welding melting point, low temperature characteristics, solder flow, solder and the fatigue life of many factors, the PV module can be used in harsh environments More complete solution.