Brazing filler metals typically contain what percentage of silver?

• A. 0-4%
• B. 5-56%
• C. 60-80%
• D. 90-100%

Answer: (B)

The key idea is how much silver is typically used in brazing fillers. For most brazing applications, filler metals are copper-based alloys and include enough silver to improve melting behavior, wetting, and strength, but not so much that the material becomes expensive or hard to hot-work. In practice, the common silver content is in a mid-range that covers roughly 5% to 56% silver. This range provides a good balance of a workable melting temperature, good capillary flow into joints, and cost. Higher-silver alloys (60% and above) exist for specialized high-strength needs, but they’re not the usual choice for everyday brazing. So the typical silver content you’ll encounter is 5–56%.