Induction can also be used to do amazing things when repairing construction machinery and commercial vehicles

It was in the workshop of the Dobler construction company in Kaufbeuren. A very well-prepared demonstration, as there were plenty of tight screws and thick, long bolts that could not be loosened. And fortunately, the situations were repeated: When asked to heat the bolt HEAD with the inductor, the astonished response was ‘but that’s exactly the wrong place, isn’t it going to expand? A few minutes of heating later (the heat is drawn into the screw, which actually expands much more than all the surrounding material) – let it cool down!

Then the priceless moment: the screw opens easily with the normal spanner. Why? Because the expanding screw has simply pushed out all the rust and incrustations. At that moment, of course, everything jams even more. After cooling down, however, the screw is free of rust – and it runs again.

After this ‘compulsory exercise’ – the freestyle. The loosening of stuck bolts. The situation: The bolt fits perfectly during assembly and even has a little play. Over the course of use, this play increases. With rust and other incrustations. The attempt to knock the bolt out, even with the biggest hammer, ends in disaster. The bolt bends and no longer fits through the hole anyway!