Oxygen sensors are used to detect the oxygen content in the pipeline after argon is introduced, prior to welding

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Argon can serve as an ideal and stable shielding gas, as its density is higher than that of air under normal conditions, and it is easy to remove air from the area. Tungsten inert gas welding is a type of arc welding that uses argon as the shielding gas; stable argon is introduced to displace air and continuously cover the welding area, preventing the metal in that area from coming into contact with air. This prevents reactions between gases such as oxygen and nitrogen with the arc and the welding area, thereby yielding high-quality welds. Argon is an inert gas that does not react chemically with metals; therefore, the weld metal and the tungsten electrode do not burn easily. Attached to the solder joint area, it provides vacuum protection throughout the entire TIG welding process. It also has extremely high stability; even at high temperatures of 1000 degrees Celsius, it does not react with alloy materials. Furthermore, argon is insoluble in metals, so pores are not easily formed. High-quality weld joints can be obtained through TIG welding. During the welding process, the oxygen content in the welding area should be closely monitored, and appropriate measures should be taken to control it. Oxygen is often used in welding to cut, heat, and stir metals. Adding oxygen to the welding process can increase the temperature and oxidation capacity of the flame, allowing the metal to reach higher temperatures and achieving better flame cleanliness. Furthermore, oxygen can oxidize the metal surface during welding to facilitate pool flow and gas expulsion. At the same time, attention must also be paid to the selection of welding equipment and materials to ensure that excessive oxygen is not generated during the welding process. In this way, the welds after welding can meet the desired quality and reliability requirements. When using oxygen in welding, its pressure should be between 0.2 and 0.5 MPa; this range is the most suitable. If the oxygen pressure is too high, it can lead to various dangerous situations, causing the welding process to get out of control and even resulting in an explosion. If it is below this range, the desired welding results cannot be achieved. Oxygen content measurement in argon gas can be easily carried out using the limit current-type zirconia oxygen sensor SO-D1-250-A300C. The limit-current type zirconia oxygen sensor SO-D1-250-A300C is capable of measuring oxygen concentrations ranging from 0.1 to 25%. It features high accuracy, low cross-sensitivity, and a long service life; in most cases, only a single-point calibration is required. It comes in a threaded housing with a sintered metal top, and its cable length is 3 meters. Since oxygen ions are the carriers of current in the zirconia electrolyte, when voltage is applied to the zirconia cell, oxygen is drawn toward the anode through the zirconia disc. If a perforated cover is placed on the cathode of the electrolyzer, the rate at which oxygen gas flows toward the cathode will be restricted. Limited by this rate, as the applied voltage gradually increases, the current in the electrolyzer reaches saturation. This saturation current is known as the limiting current, and it is proportional to the oxygen concentration in the surrounding environment.