What is cold cutting and hot cutting of medium steel plate?

Cold cutting includes water jet cutting, shearing, sawing or abrasive cutting; thermal cutting includes flame cutting, plasma cutting and laser cutting.

The flame cutting method of high-grade thick steel plate is as simple as the cutting of ordinary low-carbon and low-alloy steel, but when cutting thick steel plates, you need to pay attention!

As the thickness and hardness of the steel plate increase, the tendency to crack at the cutting edge increases. In order to prevent steel plate cutting cracks, the following suggestions should be followed when cutting:

Cutting crack:

Steel plate cutting cracks are similar to hydrogen-induced cracks during welding. If the steel plate cuts edges, it will appear within 48 hours to several weeks of thickness.

Therefore, cutting cracks are delayed cracks. The greater the thickness and hardness of the steel plate, the larger the cutting cracks will appear.

An effective way to prevent steel plate cutting cracks is to preheat before cutting.

Before flame cutting, the steel plate is usually preheated. The preheating temperature mainly depends on the quality of the steel plate and the thickness of the steel plate. The preheating method can be carried out by flame burner, electronic heating pad, or heating furnace.

In order to determine the preheating effect of the steel plate, the required temperature should be tested at the heating point.

Note: Pay special attention to preheating to make the interface of the steel plate evenly heated to avoid local overheating in the area contacting the heat source.

If it is not possible to preheat the entire page, you can use the partial preheating method instead.

Low speed cutting: Another way to avoid cutting cracks is to reduce the cutting speed.