HFW Pipe

High frequency welding (HFW) is mainly used for ordinary or thin-walled steel pipes. It includes contact welding and induction welding. DC welding is usually used for small diameter steel pipes. Generally speaking, HFW is one of the ERW production methods and uses high frequency welding technology.

• Material Grade

API 5L PSL 1: Gr A, Gr B, X 42, X 46, X 52, X 56, X 60, X 65, X 70
API 5L PSL 2: Gr B, X42 , X46 , X52 , X56 , X60 , X65 , X70 , X80
ASTM A 53: Gr A, Gr B
ASTM A252: GRADE1, GRADE2, GRADE3

• Production Standarts

TS EN 10217-1(EN 10217-1): P 195 TR1, P 235 TR1, P 265 TR1, P 195 TR2, P 235 TR2, P 265 TR2
EN 10224: L 235, L 275, L 360
ISO3183-2015.2: L 245NB, L 290NB, L 360NB
GOST 20295: K34,K38,K42,K50,K52, and K55

• Outer Diameter:114.3-660.4mm

Thickness: 2-100mm
Length:12M, 6M, 3-25M
Tolerance: ±10%

• Production characteristics

1. Fast heating speed, high production efficiency
Since the energy is highly concentrated in the welding zone, the weld edge of the tube is heated to the required temperature in a short time (a few percent to a few tenths of a second), and there is no "skip welding" at high speeds, so high welding speeds can be achieved.

2. Wide range of materials
High-frequency resistance welding belongs to the category of pressure welding, welding without external filler metal, avoiding the chemical metallurgical reaction between the welding material and the base metal and other problems, so it can be used for a wide range of materials, suitable for carbon steel welding, alloy steel, stainless steel and other metal materials welding.
3. Small size of welding heat-affected zone
Because of the high welding speed, the workpiece self-cooling effect is strong, so the size of the welded heat-affected zone is small, and oxidation is not easy to occur, the weld can be obtained better organizational properties.

4. uniform wall thickness of steel pipe, high dimensional accuracy
Straight seam high-frequency welded steel pipe is made of rolled steel strip by welding after cold deformation, wall thickness uniformity and surface quality is better than seamless steel pipe, especially the dimensional accuracy of the steel pipe is far better than seamless pipe or submerged arc welded pipe. At the same time, due to the use of hot rolled steel strip as raw material, the tube body of the inherent defects (such as cracks, inclusions, porosity, etc.) is very little, in more and more applications are used to replace seamless steel pipe. However, due to the limitation of molding equipment and heating power, the size of its pipe diameter and wall thickness are limited, and currently the pipe diameter is below Φ600mm and the wall thickness is below 13mm.
 

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