How to ensure the cutting quality of Q345B steel plate below 20mm?

The preheating temperature and flame power of Q345B steel plate, including the flow of acetylene and oxygen, increase with the increase of plate thickness. If the nozzle adopts diffusion type and oxygen curtain type, the power of flame should be larger when cutting medium and heavy plate below 20 mm, so as to speed up the cutting speed and make the cutting speed enough.

When cutting thick plate, light carbonization flame should be used to avoid collapse of the upper edge of the incision. If the carbon content of steel or alloy composition is relatively high, the use of flame power is larger. When cutting with gas, the flame should be adjusted to oxidation flame first, and then to neutral flame after cutting, so as to improve the cutting efficiency of medium and heavy plate.

Abnormal spark will be produced when cutting Q345B steel plate. This situation will affect the quality of the cutting section of the part. At this time, if other parameters are normal, the following conditions should be considered: the loss of laser head nozzle should be replaced in time.