How to Select Auxiliary Gas for Laser Cutting Galvanized Steel Sheet?

Nowadays, it is common for sheet metal enterprises to use laser cutting.

The advantage of laser cutting is that it is a processing method that does not contact materials, so it will not damage the surface of the plate, and there will be no burrs on the cutting section.

It is a processing method that can greatly reduce the subsequent process.

However, laser cutting will also encounter various practical problems that are difficult to overcome.

Here we will pay attention to the cutting difficulties and solutions of galvanized steel plate, which is widely used in daily processing.

As we all know, the function of galvanized steel plate is to protect the carbon steel inside by galvanizing the surface, which is not easy to rust after long-term use.

Although this kind of plate will be slightly more expensive than ordinary carbon steel plate, it is cost-effective in terms of the cost of the whole product because it does not need subsequent processes such as spraying for rust prevention.

But after laser processing, the situation is different.

From the perspective of auxiliary gas, there are generally three cutting processes for galvanized steel plate, namely air cutting, oxygen cutting and nitrogen cutting.

Auxiliary Gas Selection for Laser Cutting Galvanized Steel Sheet

Let’s first analyze the advantages and disadvantages of these three cutting processes:

Air cutting:

The advantage is that the processing cost is extremely low.

It only needs to consider the electricity cost of the laser itself and the air compressor, and there is no need to generate high auxiliary gas cost.

However, the cutting efficiency on the thin plate can be comparable to that of nitrogen cutting, which is an economical and efficient cutting method.

However, the shortcomings in the cutting section are also obvious.

First of all, the air cut section will produce bottom burrs, and the products processed by laser must undergo secondary processing such as deburring, which is not conducive to the whole product production cycle.

Secondly, the section of air cutting is easy to blacken, which affects the quality of products.

Therefore, the advantages of laser processing without subsequent processing cannot be reflected, so many enterprises are unwilling to choose air cutting in the processing of galvanized steel plate.

Oxygen cutting:

This is the most traditional and standard cutting method.

The advantage is that the gas cost is low, and in the sheet metal processing mainly made of carbon steel, there is no need to switch the auxiliary gas frequently, which is convenient for factory management.

However, the disadvantage is that after oxygen cutting, a layer of oxide skin will be left on the surface of the cutting section.

If this product with oxide skin is directly welded, the oxide skin will naturally peel off over time.

This is one of the reasons why the galvanized sheet is easy to solder.

Nitrogen cutting:

Nitrogen is used for high-speed processing.

Because the role of nitrogen is different from that of oxygen for combustion support, it plays a protective role, so the cut section will not produce oxide skin.

Many enterprises focus on this advantage, so nitrogen is often used for cutting galvanized steel plate.

But here are the disadvantages of nitrogen cutting:

Because there is no protection on the cutting section, the product is easy to rust.

In order to prevent the product from rusting, it had to be sprayed again.

As a result, the galvanized sheet bought at a higher cost did not give full play to the characteristics of its galvanized layer, which is quite a pity.

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