1, carbon steel after welding, don't exceed 800 degrees, more than 800 degrees high temperature will crack;

2, if you want to ensure that the weld does not crack, there are the following schemes:

1), when assembling welded components, never let the weld bear too much external force;

2) preheating is needed when welding high carbon steel;

3), open-air welding to set up the wind wall;

4) The cooling rate of the weld between high carbon steel and medium carbon steel should not be too fast, otherwise cracks will sometimes occur.