Metal fusion bonding – With means to deform work – filler – or flux portion before... – Comprising means forming one-piece blank into a tubular shape
Patent
1981-04-29
1984-03-13
Ramsey, Kenneth J.
Metal fusion bonding
With means to deform work, filler, or flux portion before...
Comprising means forming one-piece blank into a tubular shape
228 177, 228145, 72 11, 72 16, 72 49, B23K 3106
Patent
active
044362390
ABSTRACT:
In the manufacturing of a spiral pipe, there is first determined a maximum curvature which should be imparted to a strip of pipe forming material in order that a desired residual moment will be imparted to the finished pipe after the strip bent to the maximum curvature is allowed to spring back from the bent condition, which maximum curvature is determined based on the thickness, Young's modulus and yield stress of the strip, the desired curvature of the finished pipe, and the residual moment to be imparted to the finished pipe. By adjusting the position of three rows of forming rolls positioned at the apexes of a triangle, the flat strip is continuously bent into a spiral that has the thus determined maximum curvature. Then, the spirally formed strip is allowed to spring back toward its unbent shape to the diameter of the finished pipe, being stopped in the expansion due to the springback if it reaches the finished pipe diameter before completing springback or being expanded if it completes springback before it reaches the finished pipe diameter. Finally, the seam of the formed strip is welded when the strip is at the desired diameter of the finished pipe.
REFERENCES:
patent: 367494 (1887-08-01), Alden
patent: 3845645 (1974-11-01), Gebauer
patent: 3905536 (1975-09-01), Claussen
patent: 3955389 (1976-05-01), Foster
Hirokawa Toshio
Kakita Kazutoshi
Shimazaki Yasumi
Tsuyama Yoshito
Nippon Steel Corporation
Ramsey Kenneth J.
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