We also need to be generally clear about the welding process of stainless steel welded pipes, and we also need to be generally clear about the common welding methods. Let's talk about the common welding methods of stainless steel welded pipes.

Stainless steel welded pipe technology - argon arc welding
Stainless steel welded pipes require deep penetration, no oxide inclusions, and as small a heat-affected zone as possible. Tungsten inert gas shielded argon arc welding has good adaptability, high welding quality and good penetration performance. It is widely used in nuclear industry and food industry.
The disadvantage of argon arc welding is that the welding speed is not high. In order to improve the welding speed, argon arc welding with three electric torches is generally used. Welding quality is also improved. The combination of argon arc welding and plasma welding can weld steel pipes with larger wall thickness. In addition, 5-10% hydrogen in argon gas, and then high-frequency pulse welding power source can also increase the welding speed.

Stainless Steel Welded Pipe Technology - High Frequency Welding
Frequency welding has higher power supply, and can achieve higher welding speed for steel pipes with different materials and outer diameters and wall thicknesses. Compared with argon arc welding, its welding speed is more than 10 times. Therefore, the production of general-purpose stainless steel pipes has high productivity.
Because of the high speed of high-frequency welding, it is difficult to remove the burrs in the welded pipe. At present, high-frequency welded stainless steel pipes cannot be accepted by the chemical and nuclear industries, which is one of the reasons. From the perspective of welding materials, high-frequency welding can weld various types of austenitic stainless steel pipes. At the same time, the development of new steel grades and the advancement of forming welding methods have also successfully welded steel grades such as ferritic stainless steel AISI409.

Stainless Steel Welded Pipe Technology - Combined Welding Technology
Combination welding methods include: argon arc welding plus plasma welding, high frequency welding plus plasma welding, high frequency preheating plus three-torch argon arc welding, and high frequency preheating plus plasma plus argon arc welding. Combination welding increases the welding speed very significantly. For the combination welded steel pipe using high frequency preheating, the weld quality is comparable to that of conventional argon arc welding and plasma welding, the welding operation is simple, and the entire welding system is easy to realize automation. This combination is easy to connect with the existing high frequency welding equipment. Low cost and good benefit.

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