Welding of austenitic stainless steel pipe

Abstract: This thesis mainly studies the welding method and technology of austenitic stainless steel pipe butt joint. The welding of 0Cr18Ni9 austenitic stainless steel with tungsten arc welding (TIG) has special mechanical properties and performance, and it is widely used in the machining industry. . Because r18Ni9 austenitic stainless steel is being welded, the weld and heat affected zone

(HAZ) The cracks are highly sensitive and the welded joints are prone to intergranular corrosion. In order to solve this problem, this process adopts corresponding preventive measures in welding and metallurgical processes. After welding, the common welding seam defects can be overcome after welding inspection, and can meet the current requirements. Keywords: odorite stainless californium: welding process; heat-affected zone; crystal Indirect corrosion

In the 21st century, with the rapid development of my country's machining and manufacturing industry, the industrial consumption of stainless steel has increased rapidly. In 2001, the consumption exceeded 2.2 million tons and reached 5.22 million tons in 2005. After that, the consumption has increased substantially every year. By 2017, China's stainless steel crude steel output was 25.7915 million tons, which has become the world's most austenitic stainless steel. It has excellent weldability, toughness, corrosion resistance, and good mechanical processing performance, so it occupies a pivotal position in the machinery manufacturing industry in China and the world, and is widely used in dry automobile manufacturing, pressure Container storage tank, construction bridge, aerospace, ship and furniture decoration industries. In the processing and manufacturing of stainless steel workpieces, welding is an indispensable machining technology. As the application of stainless steel becomes more and more widespread, the requirements for the mechanical properties and quality of related welded parts are constantly improving, so the requirements for welding methods and processes are gradually increasing. Moreover, with the continuous introduction of new technologies in other countries with developed manufacturing industries, some foreign new materials, new welding technologies or welding processes continue to impact the domestic stainless steel market. Therefore, higher requirements are placed on the domestic stainless steel machining technology, especially Compared with the welding technology of foreign countries, especially in some manufacturing countries, my country still has a big gap, mainly in welding equipment, welding materials, welding methods and processes. In addition, some welding standards implemented in my country are relatively Relatively backward. Therefore, with the rapid development of industrial manufacturing in my country, the quality of austenitic stainless steel welding methods and processes, welding materials and welding products must be continuously improved to ensure the quality of welding products and gradually reduce the gap with foreign countries. At the same time, it is necessary to further strengthen the research and development of high-quality special stainless steel welding consumables and welding technology to meet the needs of today's domestic and foreign stainless steel consumer markets, enhance my country's own competitiveness, and contribute to my country's industrial manufacturing.