Seam-welded metal pipe and method of making the same without...

Details Seam-welded metal pipe and method of making the same without... Seam-welded metal pipe and method of making the same without...

2006-04-25

2006-04-25

Stoner, Kiley S. (Department: 1725)

Metal fusion bonding

Process

With subsequent treating other than heating of bonded parts...

C219S06000A, C219S607000, C219S617000

Reexamination Certificate

active

07032809

ABSTRACT:
An apparatus and method for making a seam-welded steel pipe free of untempered martensite without seam anneal. The method includes selecting a steel containing a carbon concentration below a predetermined level, for example, 0.14% or 0.12% by weight. The method also includes flooding both outside and inside of the strip with a coolant while the weld seam is being formed, and continuing to immerse the welded strip for a sufficient time after the weld seam is formed to prevent the formation of untempered martensite. The apparatus includes a heater capable of heating the strip to a temperature sufficient to form a welded seam, a cooling module configured to supply a coolant to the welded seam both inside and outside of the strip as the weld seam is being formed, and another cooling module configured to immerse the welded strip in a coolant after the weld seam is formed for a sufficient length of time to prevent the formation of untempered martensite.

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