Method for producing helical seam pipes

US4061264A · kind A · utility

Assignee

• Blohm & Voss GmbH · DE

Inventors

• Werner Bartels
• Heinz Krakow · Hamburg, DE

Key dates

• Filing date: May 4, 1976
• Grant date: Dec 6, 1977
• Expiry date: May 4, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K9/0325
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

In winding a continuous strip of sheet metal having chamfered edges into a helical seam pipe, the chamfered edges define an inside seam and an outside seam in the pipe. Initially, after forming the pipe, a tack weld is formed in the outside seam and then a finish weld is provided in the inside seam. Next, the pipe is cut into lengths and finally a finish weld is made in the previously tack welded outside seam. The cross sectional area of the inside seam is kept to a minimum and though different thicknesses of strip can be used for forming the pipe, the cross sectional area of the inside seam is maintained a constant over the range of strip thicknesses used to assure that the inside seam is finish welded in as short a time as possible with the pipe moving axially at the highest possible speed.