Analysis of Proportional Gas Concentration in Welding Process

Mixed gas is a mixed gas obtained by mixing two or more gases in an appropriate ratio. Using mixed gas as shielding gas can improve welding quality, weld seam quality and welding speed, thereby reducing spatter and labor costs, so it is widely used in industry. However, in order to accurately control the quality of welding, it is necessary to accurately analyze the gas concentration of each proportioned gas in the mixed gas.

A mixed gas mixing cabinet, also known as a gas proportioner, is required for the proportioning of mixed gases. It is a large-flow two-element or multi-element gas mixing device specially designed for gas protection. It is mainly used in conjunction with centralized gas supply busbars. This device can The two or more gases that need to be used are proportioned according to the requirements of use, and a uniform mixed gas is obtained. It can be widely used in various mixed gas protection occasions such as railways, ships, chemicals, machinery manufacturing, controlled atmosphere preservation, electric light source, leak detection (alarm), disinfection and sterilization.

The working principle of the mixed gas mixing cabinet: the two-element or multi-element gas that needs to be mixed enters the two-stage or multi-stage pressure balance device through the one-way valve to balance the input pressure difference, thus ensuring the absolute pressure of the component gas and the dilution gas before mixing. Same, then adjust the flow control valve, the flow of various gases can be adjusted according to the desired mixing ratio. In principle, the dynamic gas mixing method is adopted, that is, mixing and use, thus ensuring the uniformity of the mixed gas, excellent reproducibility and stable ratio.

For the above mixed gases, Wuyanji provides a variety of gas concentration analysis solutions:

0～50%/30% carbon dioxide, the rest argon, need to measure the CO2 concentration, mainly using the infrared measurement principle (NDIR, None-Dispersive Infra-Red)

0~50% carbon dioxide, the rest of nitrogen, the CO2 concentration needs to be measured, mainly using the infrared measurement principle (NDIR, None-Dispersive Infra-Red)

0~50% argon, and the rest of helium, the concentration of helium needs to be measured, mainly using the measurement principle of thermal conductivity (TCD, Thermal Conductivity Detection)

0~2% oxygen, the rest of argon, O2 concentration needs to be measured, mainly using the measurement principle of 3D ion flow (3D Limiting Current Type Oxygen Analyzer)

0~10% hydrogen, the rest of argon, the concentration of H2 needs to be measured, mainly using the measurement principle of thermal conductivity (TCD, Thermal Conductivity Detection)

0~20% oxygen, the rest argon, O2 concentration needs to be measured, mainly using the measurement principle of ion flow (3D Limiting Current Type Oxygen Analyzer)

0~5% oxygen, 0~15% carbon dioxide, and the rest of argon, the concentration of argon and O2 must be measured at the same time, mainly using the measurement principle of ion flow (3D Limiting Current Type Oxygen Analyzer)/(NDIR, None-Dispersive Infra-Red )

0~50% argon, the rest helium, no