Stress corrosion cracking, solder brittleness of 1.0038 | S235JR | K01500 with CuAlNi2 solder

In this special form of stress corrosion cracking, the liquid Cu solder represents the corrosion medium. The Cu diffuses into the construction steel along the grain boundaries under tensile stress. As a result, intergranular cracks form in the base metal. In the cracks, the reddish color of the causer is very clearly visible.