Long ago, people realized that stainless steel welded pipes were superior to stainless steel seamless pipes in terms of material and mechanical properties. However, the removal of internal and external weld reinforcement, especially the removal of internal weld reinforcement, has been a problem for stainless steel welded pipe production enterprises, and the application of stainless steel welded pipes has also been limited. Therefore, how to achieve seamless stainless steel welded pipes is a very important issue for welded pipe manufacturers.

Numerous schemes have been proposed in the past, such as built-in scrapers or internal grinding devices, but the results have not been ideal. This seriously hinders the further expansion of the application field of stainless steel welded pipes. It was not until Han Gao Machinery successfully developed the first domestic double push type internal leveling machine that this technical challenge was solved. Han Gao Machinery has developed a stainless steel inner and outer weld leveling device by absorbing and digesting the technology of imported equipment from abroad. It was successfully applied to two stainless steel welded pipe units of a well-known stainless steel welded pipe manufacturing company in Foshan in 2003. Since its production for nearly five years, it has been running well and has achieved good investment benefits; Since 2006, we have provided 37 internal and external weld leveling devices for companies in Foshan, Wenzhou, Wuxi, Jingmen, Shanghai, Wenling, Songyang, Jiangyin, and other places. At present, stainless steel welded pipes have replaced seamless pipes in industries such as petroleum, chemical, nuclear power, boilers, food, and medicine.

How does the internal leveling machine achieve seamless stainless steel welded pipes?

The welding seam leveling equipment of Henkel Machinery, also known as the internal leveling machine, is the first "horizontal double push technology" in China, with more stable operation and softer reversing. The internal leveling machine of Henkel uses a pair of rollers to repeatedly crush the protruding weld seam, with up to twenty times per minute. Its performance is stable and the reversing is gentle. Minimize the impact on welded pipes on the production line to achieve stable operating results. The control system and protection device of the internal leveling machine adopt PLC and proportional hydraulic automatic control, which has stable performance, high yield, convenient installation, error output, startup input, and production line linkage, ensuring the reliability and safety of the equipment

The Han Gao double push series weld seam leveling equipment achieves online processing of welded pipe welds, synchronously rolling the internal and external welds of the welded pipe repeatedly, making the transition between the weld seam and the base material smooth, and highlighting the advantages of the welded pipe. It is a specialized equipment for improving the crystal level of the weld seam.