Title: Method and apparatus for expanding spiralweld pipe

Abstract: This invention provides a method and apparatus for expanding spiralweld pipe. The expander head is cantilevered at a fixed location and the spiralweld pipe is advanced in stages around the expander head, moving in the direction of the pipe axis. At each stage, the pipe is stopped, and the expander head is expanded to cause expansion in the pipe. The expander head has on its surface a helically arranged recess matching the main weld of the pipe. As the pipe is moved between adjacent expansion locations, it undergoes axial and rotational motion so that the main weld tracks in registry with the recess.

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Inventors: Hookings, Paul H. (Ridgeville, CA, US)
Wade, Harry C. (Welland, CA, US)
Deijs, Phillip (Welland, CA, US)

Application Number: 698964
Filing Date: 1976-06-23
Publication_date: 1977-09-13
Assignee: The Steel Company of Canada, Limited (Hamilton, CA)
Primary Class(es): 72/370.08 29/213.1, 72/393
Other Classes:
US Patent Ref:

3503245	Mar, 1970	Brandl	72/37.
3981172	Sep, 1976	Hess et al.	72/393.

Other Refs:
Primary Examiner: Duzan, James R.
Assistant Examiner:
Attorney: Sim & McBurney