High Frequency Induction (HFI) Welded Pipe

In High Frequency Induction (HFI) production process, hot rolled steel coils are fed with a high capacity accumulator in order to achieve continuous welding.

HIGH-FREQUENCY WELDING is a welding process in which the heat source used to melt the joining surfaces is obtained from high-frequency (HF) alternating current (ac) resistance heating.
Coil edges are milled using carbide cutters in order to assure a high quality weld. Coils are then formed by cold forming method using a set of cage rolls and fin passes, and then joined using high frequency currents using induction or alternatively conduction methods.

Using its specialist expertise in high frequency welding, TWI has supported industry with a range of project and consultancy work which has included:

mechanical properties of welded pipe
metallurgical studies on welds
defect examination
optimisation studies on HF butt welding of tailored blanks


testing facilities for fracture mechanics studies
corrosion & metallurgical test equipment
non-destructive testing
process advice & troubleshooting
tailored training courses

Application Areas

HFW welded steel pipes are widely preferred in Oil, Natural Gas, Water and other liquids transportation and distribution lines, heating, cooling, ventilation piping and steel structures for construction and other general purposes by means of precise production tolerances and high capacity manufacturing method.