US Patent 7988908 Filler metal alloy compositions

Provided is a filler metal alloy composition capable of improving appearance of a welded zone and fluidity, penetration, etc., of an inexpensive filler metal by minimizing a content of silver (Ag) and adding tin (Sn) and silicon (Si) components. The filler metal alloy composition, brazed to a joint between parent metals to stably join the parent metals formed of the same material or different materials, is characterized in that the composition comprises silver (Ag), copper (Cu), zinc (Zn), tin (Sn), silicon (Si), and other unavoidable impurities.