Stainless steel tube welding process

Non-air oxidation maintenance steam continuous heating furnace is used in the quenching and tempering treatment of stainless steel pipes in foreign markets. The intermediate quenching and tempering treatment and the final commodity quenching and tempering treatment are carried out in the production process. The traditional pickling process is eliminated, because a bright surface layer without air oxidation can be obtained. The use of this type of heat treatment method not only improves the quality of seamless steel pipes, but also gets rid of the environmental pollution of pickling passivation to the natural environment.

According to the development trend of today's society, most of the bright continuous furnaces can be divided into three types:

The stainless steel welded pipe has a specified penetration depth, no compound mixing, and the smallest possible heat hazard area. The tungsten inert gas maintenance argon arc welding machine has excellent adaptability, high welding quality, and good penetration characteristics. The commodity market is used in chemical plants and nuclear power plants. Industry and other industries. Manufacturing and food industry.

Low electric welding rate is the defect of argon arc welding machine. In order to increase the welding rate of electric welding, various welding processes have been developed and designed overseas. Among them, a single-metal electrode single welder was developed, and a multi-metal electrode multi-welder welding process was used in the production. In the 1970s of the 20th century, France chose multi-welders arranged along the parallel lines of the electric welding azimuths, which produced a long hot gas, which further improved the welding speed of electric welding. Generally use three-metal electrode welding machine and argon arc welding machine. The wall thickness of the welded steel pipe exceeds 2mm, the electric welding speed is -4 times that of the single welder, and the electric welding quality is also improved. The argon arc welding machine is closely combined with low-temperature plasma electric welding, which can weld seamless steel pipes with a large wall thickness. In addition, the high-frequency single-pulse electric welding switching power supply with 5-10% radon added to the argon gas can also increase the welding speed of electric welding.

Multi-welder argon arc welding machine is suitable for electric welding of ferrite and stainless steel round pipes.

High-frequency welding has a history of more than 40 years in the manufacture of alloy steel welded steel pipes, but this is a relatively new stainless steel pipe welding method. The rationality of its manufacturing has made its products more commonly used in industries such as architectural decoration design, electrical products, and mechanical structures.

High-frequency welding has a higher switching power supply, and can maintain a higher electric welding rate for seamless steel pipes of different materials, different diameters, and different wall thicknesses. Compared with argon arc welding machine, the welding speed of electric welding is about 10 times that of argon arc welding machine. Therefore, the production of stainless steel pipes for general main purposes has a higher output rate.

Because high-frequency welding is faster, the chatter marks in the welded steel pipe cannot be removed. At this stage, high-frequency welded stainless steel pipes can no longer be accepted by chemical plants and the nuclear industry. This is one of the reasons.

From the point of view of welding consumables, high-frequency welding can weld many types of low-alloy steel pipes by electric welding. In addition, the development trend of new alloy structural steel and the development of forming welding technology have also achieved successful electric welding of stainless steel round pipe AISI409 and other alloy structural steels.

Various welding processes for stainless steel welded pipe have advantages and disadvantages. How to give full play to the strengths, prevent shortcomings, integrate a variety of welding processes, and produce new welding techniques to consider everyone's regulations on the quality and productivity of stainless steel welded pipes is the trend of technical development of stainless steel welded pipes.

After recent years of exploration and scientific research, the composition welding method has been developed, and the stainless steel welded pipe manufacturing in Japan, the Netherlands and other countries has grasped a certain composition welding method.

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