It should be noted that HFW tube is a kind of ERW tube.

High frequency welding (HFW) is a solid resistance heat. Through the high-frequency current welding resistance, heat is generated in the contact object, so that the surface of the object is heated to a plastic state, and then forged or not forged to achieve the combination of steel.

High-frequency current passing through a metal conductor will produce two peculiar effects, the skin effect and the proximity effect. The HFW process uses the skin effect to concentrate on the surface of the steel object, and uses the proximity effect to control the position and power of the high-frequency current path. Due to the high speed, the edge of the board in contact can be heated and melted during the shore time, and then squeezed through the butt joint process. The productivity of HFW steel pipe is high, the welding speed can reach 30m/min, and the welding current frequency is equal to or greater than 70 kHz. Mainly used to manufacture pipes with welded longitudinal seams or spiral seams. Welded pipes are welded by high-frequency welding technology and are mainly used to transport pressure fluids such as water, oil, and natural gas.

Size: Outer diameter: 12"-24" Wall thickness: 1.65-20mm Length: 3m-12m

Standards: ASTM 5L, ASTM A53, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217

Advantages of HFW pipe During the welding process, HFW pipe does not need to add filler metal. Therefore, the welding speed is fast and the production efficiency is high. HFW pipes are widely used in fields such as oil and gas transportation, oil well pipelines, building structures and various mechanical pipelines. However, the quality of HFW steel pipes is affected by many factors such as raw materials and processes. And production quality control becomes difficult. Therefore, the yield and welding process need to be continuously improved.

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