Characteristics of argon hydrogen gas flow in the

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Plasma cutting argon hydrogen gas flow characteristics

in the use of plasma cutting machines, argon hydrogen is relatively less used as an auxiliary cutting, which is mainly used for the cutting and processing of some non-ferrous metal materials. Due to the disadvantages of using the mode of cost phase, it will be shown that it is more separated than air, but the detection neutron cutting of loading soft copper or annealed copper rod is larger, and many enterprises will be unfamiliar with argon hydrogen plasma cutting for the first time

the working gas that Dongguan zhenleili electromechanical will introduce to you in detail below is working gas, including cutting gas and auxiliary gas. Some equipment also requires arc starting gas. Usually, the appropriate working gas should be selected according to the type, thickness and cutting method of cutting materials. Cutting gas should not only ensure the formation of plasma jet, but also ensure the removal of molten metal and oxide in the incision. Excessive gas flow will take away more arc heat, making the length of the jet shorter, leading to the decline of cutting ability and instability of the arc; Too small gas flow will make the plasma arc lose its due straightness and make the cutting depth shallow, and it is also easy to produce slag; Therefore, the gas flow must be well matched with the cutting current and speed. Nowadays, most plasma arc cutting machines rely on gas pressure to control the flow, because when the gun aperture is certain, controlling the gas pressure also controls the flow. The gas pressure used for cutting materials with a certain thickness is usually selected according to the data provided by the equipment manufacturer. If there are other special applications, the gas pressure needs to be determined through the actual cutting test. The most commonly used working gases are argon, nitrogen, oxygen, air, H35, argon nitrogen mixture, etc

1. Argon hardly reacts with any metal at high temperature, and argon plasma arc is very stable. Moreover, the nozzle used has a long service life for plastic coated parts and electrodes. However, the voltage of argon plasma arc is low, the enthalpy is not high, and the cutting ability is limited. Compared with air cutting, its cutting thickness will be reduced by about 25%. In addition, in argon protected environment, the surface tension of molten metal is larger, which is about 30% higher than that in nitrogen environment, so there will be more slag hanging problems. Even if the mixture of argon and other gases is used for cutting, there will be a tendency of slag sticking

therefore, pure argon is rarely used for plasma cutting alone

2. Hydrogen is usually used as an auxiliary gas to mix with other gases. For example, the famous gas H35 (the volume fraction of hydrogen is 35%, and the rest is argon) is one of the gases with the strongest plasma arc cutting ability, which is mainly beneficial to hydrogen. Because hydrogen can significantly increase the arc voltage, the hydrogen plasma jet has a high enthalpy. When mixed with argon, the cutting ability of the plasma jet is greatly improved. Generally, argon + hydrogen is often used as cutting gas for metal materials with a thickness of more than 70mm. If water jet is used to further compress argon + hydrogen plasma arc, higher cutting efficiency can also be obtained, which can be displayed in three ways. (end)

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