Every expert knows that too much heat can change the strength properties of metal. But whereas with a flame…

…the temperature rises uncontrollably and, above all, over a large area, induction can be used to heat very selectively. In order to achieve a certain thermal expansion, a flame with large excess temperatures from the surface would have to be used, and damage to the surrounding area is inevitable.

A series of temperature measurements were carried out in the test, which showed that not even 300°C was reached in the actual tie rod when loosening a tie rod nut using induction. This is far outside the range of strength changes.