Pressure Vessel is a closed device that holds a gas or liquid and carries a certain pressure. A pressure vessel is a closed vessel that can withstand pressure. Pressure vessels are extremely versatile and have an important position and role in many sectors such as industry, civil, military, and scientific research. Among them, pressure vessels used most in the chemical industry and petrochemical industry, and only used in the petrochemical industry account for about 50% of the total number of pressure vessels.
Pressure vessels are used in the chemical and petrochemical industries, mainly for heat transfer, mass transfer, reaction and other processes, as well as storage and transportation of pressurized gas or liquefied gas; they are also widely used in other industrial and civil fields, such as air. compressor. All kinds of special compressors and auxiliary compressors for refrigeration compressors (coolers, buffers, oil-water separators, gas storage tanks, evaporators, liquid refrigerant storage tanks, etc.) are all pressure vessels.
1. The manufacturing process of the pressure vessel can be generally divided into: raw material acceptance process, scribing process, cutting process, descaling process, machining (including planing, etc.) process, rolling process, group-pairing process, welding process (product welding test) Board), non-destructive testing process, hole drilling process, general inspection process, heat treatment process, pressure test process, anti-corrosion process.
2. Different welding methods have different welding processes. The welding process is mainly determined according to the material, grade, chemical composition, weldment structure type and welding performance requirements of the workpiece to be welded. First of all, we must determine the welding methods, such as hand arc welding, submerged arc welding, tungsten argon arc welding, gas metal arc welding, etc.
There are many types of welding methods, which can only be selected according to specific conditions. After the welding method is determined, the welding process parameters are determined, and the types of welding process parameters are different. For example, hand arc welding mainly includes: welding rod type (or brand), diameter, current, voltage, welding power source type, polarity connection, welding Number of layers, number of tracks, test methods, etc.
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