Patent ID: 6843273
Filing Date: 2005-01-18
Classification: B21C,B23K,F28F,Y10T

Abstract:
1. A gilled metal pipe, particularly a heat exchanger pipe, comprising a cylindrical pipe body ( 2 ) and a gill-forming strip ( 4 ) wound onto it in a helical line, which is connected to the pipe surface by means of a weld ( 5 ) produced with an electric welding device and using an additional material, characterised in that the strip ( 4 ) is provided with a web ( 6 ) running parallel to the pipe body surface, in that the web ( 6 ) has a leg bent at roughly right angles on the strip ( 4 ) that forms the gills, in that the contact surface ( 10 ) of the web ( 6 ) is welded to the pipe body surface ( 3 ) at a region of an open wedge between the pipe body surface ( 3 ) and the contact surface ( 10 ) of the web, in that both the surface ( 3 ) of the pipe body ( 2 ) and the contact surface ( 10 ) of the web ( 6 ) to be welded to it are fused during the welding process, and in that the weld ( 5 ), consisting of additional material, is narrower than the width of the web.