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 HF welded products, manufactured to API specifications for line pipe and oil well casing, require heat treatment in the weld zone. This process, known as seam annealing or normalizing is carried out to restore the grain structure in the weld zone to a finer structure which is equal to that of the parent metal. This refining process is done to prevent possible stress or corrosion cracking at the weld seam. Seam annealing units are available for inline and offline applications and for both longitudinally and spirally welded pipes. Recent advances in inductor design make it possible to seam normalize tubes as small as 0.75" (19.0 mm) and spiral pipe welds with any helix angle.
If desired the seam annealing system can be equipped with a fully automatic weld seam tracking. This system will ensure complete annealing of the weld seam even if it should vary from the vertical position due to cambered strip or incorrect mill set-up. |
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