| Summary: | Brazing is one of the most important techniques known in joining two similar/dissimilar metals/metal–nonmetal
combinations for structural, mechanical, and aerospace applications. Brazing joints are formed by melting pure or
alloyed foil called braze. Braze is melted in between the two substrates to be joined, and the joint is formed due to
inherent adhesion and reactivity between braze and substrate. Copper and nickel are most commonly used brazes
in the industry. Copper behavioral studies are mostly aimed at stainless steels (SS), and lot of research is carried
out in Cu–SS systems. But, what is the copper behavior with medium carbon steels? What is the grain boundary
behavior of copper and its mechanism when the alloying elements in steel are very low? Sandwich experiments
were conducted with C45/Cu/C45 systems under an inert gas environment at 1100 °C. Cu was found to be wetting
and penetrating the grain boundaries of medium carbon steel such as C45. The depth of penetration varied depending
on holding times. The microstructure of the interface was characterized by SEM, and penetration depth was measured
by image analysis software for better resolution and accuracy.
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