Method of manufacturing multilayer screw seam pipes and device for carrying out the method
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United States of America Patent
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-
Nov 4, 1986
Grant Date -
N/A
app pub date -
Aug 10, 1984
filing date -
Aug 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method of manufacturing multilayer helical seam pipes from strips or bands lying loosely over each other to prevent porous welding seams due to heated air escaping from resultant gaps between the layers of strips, comprising feeding the strips to a deformation station at an angle of entry corresponding to the pipe diameter, arc welding seams of the band edges with several arc welding heads, and arc welding a seam to the inside contact points of the area containing the band seams with another welding head to connect the adjacent bands.
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