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.