Today's sheet metal companies, the use of laser cutting has long been commonplace. The advantage of laser cutting is that it is a non-contact material processing means, so it will not damage the surface of the board, and the cutting surface will not leave a burr, is a can greatly reduce the process after the processing method. However, most powerful laser cutting will encounter a variety of practical difficult to overcome the problem. Here we are concerned about the daily processing of the more commonly used in the galvanized steel cutting difficulties and solutions.
We all know that the role of galvanized steel is through the surface of zinc to protect the inside of carbon steel, long-term use is not easy to rust a plate. Although this plate will be slightly more expensive than ordinary carbon steel plate, but because there is no need for rust and other spray after the process, so the cost of the entire product, or cost-effective.
But after laser processing, the situation is not the same. From the auxiliary gas point of view, the general galvanized steel plate has three cutting processes, namely air cutting, oxygen cutting and nitrogen cutting. We first analyze the three cutting the advantages and disadvantages of their respective processes:
Air cutting: the advantage is very low processing costs, only need to consider the green astronomy laser itself and air compressor electricity can be, without the need to produce high auxiliary gas costs, and cutting efficiency in the sheet can match the nitrogen cutting, is a kind of economic And efficient cutting method. But the shortcomings in the cutting surface is also obvious. First of all, the air cutting section will produce the bottom of the burr, laser processing products must also go through the deburring and other secondary processing, is not conducive to the entire product production cycle. Second, the air cutting section is easy to black, affecting the quality of the product. Therefore, the green laser pointer processing without the need for follow-up can not be reflected, so in the galvanized steel for the processing, many companies are reluctant to choose the way of air cutting.
Oxygen cutting: This is the most traditional and most standard cutting method. The advantage is that the gas cost is low, and in the carbon steel-based sheet metal processing, without frequent switching auxiliary gas, easy to plant management. But the disadvantage is that after the oxygen cut, cut in the surface will leave a layer of oxide, if directly with this oxide products with welding, then a long time, the scale will naturally peel off. This is one of the reasons for the easy soldering of galvanized sheet welding.
Nitrogen cutting: the use of nitrogen for high-speed processing, due to the role of nitrogen is different from the combustion of oxygen, but play a protective role, so the cutting section does not produce oxide. Many companies that is fancy this advantage, so the galvanized steel cutting is often the use of nitrogen for processing. But the shortcomings of nitrogen burning laser pen cutting is here: because the cutting section is completely unprotected, so the product is easy to rust. And in order to prevent the product rust, then had to spray again, the results, more cost to buy back the galvanized sheet, but did not play the characteristics of its galvanized layer, had to say quite a pity.