Temperature gradient dT/dt

This represents the gradient or the first derivative of the temperature curve. The temperature gradient is extremely important for joining processes, as the temperature change per time dT/dt has a major influence on the thermo-mechanical stresses in the assembly.

If the gradient is too high, fractures and cracks can occur in the material due to the high stresses. A low gradient can result in excessive grain growth of the joining material, which affects the lifetime.

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