| 摘要 |
A method for roll embossing an enhancement pattern into a surface of a metal strip. The method is intended for use in manufacturing roll formed seam welded metal tubing having interior or exterior surface enhancements to improve the heat transfer characteristics of the tube. Metal strip produced by use of the method has a weld zone adjacent each edge of the strip that does not have the surface pattern embossed upon it but has been rolled to a thickness less than the initial thickness of the strip feedstock. The amount by which the rolled thickness of the strip in the weld zones is reduced from the initial thickness is such that the portions of the strip in the weld zones undergo the same elongation as the central portion of the strip which receives the roll embossed surface enhancement. In this way no tensile stresses are introduced into the weld zone and it has a uniform and predictable thickness that will ensure a good welded seam during later welding into finished tubing.
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