The filler metal in brazed joints melts at what temperature range?

• A. 842
• B. 400
• C. 1000
• D. 1200

Answer: (A)

In brazing, the filler metal must melt to flow into the joint while the base metals remain solid, so the filler’s melting point is chosen well above solder temperatures but below the base metals’ melting points. A typical brazing filler metal melts around 842°F (about 450°C). Heating to this range allows the filler to liquefy and flow into the joint by capillary action, then cools to form a strong bond without melting the base metals. The other temperatures are outside the usual brazing filler metal range—one is low enough for soft solder, while the others are higher temperatures associated with different alloys.