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High frequency welding, HFI pipe

In High Frequency Welded (HFW) pipe 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.

Expertise

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

Resource:

• 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.

 

All SSE's Pipes and fittings are conducted to ISO 9001 quality standard
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