What is the difference between a brazed joint and a soldered joint when it comes to temperature range?

• A. Brazing uses higher temperatures with filler alloys above 450°C.
• B. Soldering uses higher temperatures with filler alloys above 450°C.
• C. Brazing uses lower temperatures with filler alloys below 450°C.
• D. Soldering uses lower temperatures with filler alloys below 450°C.

Answer: (D)

The main idea is how hot you have to heat for the filler metal to melt. In soldering, the filler metal melts at relatively low temperatures, below 450°C, while the base metals stay solid. This is why soldered joints are made with solders that melt in that lower range and are typical for electronics and light plumbing.

In brazing, you heat much higher, causing the filler metal to melt above 450°C and flow into the joint while the base metals remain solid. This higher heat level is what creates stronger joints and the ability to join dissimilar metals more robustly.

So the correct statement captures the temperature difference: soldering uses lower temperatures with filler alloys that melt below 450°C. The other options describe the temperature direction incorrectly for soldering or mix up the distinction.