The production methods of high-frequency welded pipes mainly include intermittent and continuous. Discontinuous production uses a single short strip or small coil strip, without butt welding and bending needle storage equipment. Continuous production uses large steel coils, butt welding, and bending needles. Some factories do not have welding equipment and use a semi continuous production method between the two, where large roll steel is used as the raw material (or small rolls are connected to form large rolls) but there is no butt welding.
The various process flows of the main products produced on the continuous welded pipe unit are as follows: raw materials in the water and gas pipeline production process → reserve amount → unwinding → leveling → cutting head → butt welding → removing welding burrs → circulation → leveling → forming → high-frequency welded pipes → excluding burrs → water cooling → slurry → running cutting → straightening → cutting head → water pressure → inspection → sorting → changing feet and entering the warehouse.
For different steel grades, such as 1OTi and 16Mn, different process specifications are adopted during the forming welding and cooling process according to the different process characteristics to ensure complete welding quality.
The production technology of welded steel pipes in foreign countries is developing rapidly. The high-frequency welded pipe supplier has indicated that a rolling horizontal bending needle device has been developed. This unit adopts a dual radius combination hole type. Most high-frequency frequency strings are between 3.5 and 450000 cycles. In recent years, over 50000 cycles with a frequency of over 5000 [0004e20] have been used to produce thick walled steel pipes. The welding speed can reach up to 130 → 150 meters per minute. The internal burr removal process can be carried out in steel pipe production, with an inner diameter of 15 → 20mm. Perform various non-destructive tests on the homework line and offline.
In addition to general high-frequency welding, welding machines also use DC welding, square wave welding, tungsten inert gas shielded welding, plasma welding, and electron beam welding. Some companies install pressure reducing devices after welding pipe units to produce small steel pipes. Widely used steel pipes, including thin-walled pipes, thick walled pipes, irregular pipes, pot protection pipes, oil pipes, and stainless steel pipes. The high-frequency welded pipe supplier indicates that it also has advanced continuous galvanizing and surface coating processes. Many innovations have also been made in the layout and design of units
In recent years, welded pipes have achieved rapid development, and the production of welded pipes abroad accounts for about 60% of all steel pipes. In recent years, welded pipe units have also developed rapidly in China. However, due to the lack of powder raw materials, mismatched equipment, and low mechanization process, production capacity has not been fully utilized.
