Which of the following is not one of the major differences between soldering and brazing?

The color of the joint is not considered one of the major differences between soldering and brazing. Both processes involve the joining of metals by melting a filler material, and while the final appearance of the joint can vary based on the materials used and the conditions of the process, the color itself does not fundamentally differentiate soldering from brazing.

In contrast, the type of flux used, composition of the filler metal, and the amount of heat required are significant factors that define the two techniques. Soldering generally uses lower melting point filler metals and fluxes designed for that temperature range, whereas brazing requires higher temperatures and typically features a different composition of filler metals capable of forming strong joints at those elevated temperatures. The amount of heat required distinctly sets these processes apart, with brazing usually necessitating more heat to achieve the higher melting point of the filler materials.