Title of Invention

METHOD FOR PRODUCING GILLED METAL PIPES

Abstract

Method for producing gilled metal pipes, particularly heat exchanger pipes, where at least one continuous, gill-forming strip is applied to a rotating pipe body at a tangent and wound onto the pipe body in helical line, the side of the strip facing the pipe body is connected to the pipe surface by means of an electric welding device using an additional material, and the working end of the welding device is guided in the open wedge between the pipe surface and the winding strip, characterized in that a web has a lig bent at roughly right angles on the strip (4) that forms the gills before said strip is wound onto the pipe body (2), in and the web is guided flat on the pipe body (2) during winding of the strip (4) onto the pipe body (2), while the leg positioned roughly at a right angle thereto forms the gills, in that welding is carried out in the region of the open wedge between the pipe body surface (3) and the contact surface (10) of the web (6) facing the pipe body surface, 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) produced using the additional material is narrower than the width of the web (6).

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See Section 10; rule 13] "METHOD FOR PRODUCING GILLED METAL PIPES" I, GEORG BRUNDERMANN, a German citizen of Hauptstrasse 32, 49832 Thuine, Federal Republic of Germany, The following specification particularly describes the invention and the manner in which it is to be performed: The present invention relates to a method for producing gilled metal pipes. The invention relates to a method for producing gilled metal pipes, particularly heat exchanger pipes, where at least one continuous, gill-forming strip is applied to a rotating pipe body at a tangent and wound onto the pipe body in an approximately helical line, the side of the strip facing the pipe body is connected to the pipe surface by means of a welding device using an additional material, and the working end of the welding device is guided in the open wedge between the pipe surface and the winding strip. The invention further relates to an device fox implementing the method, and to a gilled pipe manufactured by this method. A method of the type described is known from EP 0 604 439 Bl. In this known method, the strip is fed vertically to the rotating pipe body and the narrow side of the strip facing the pipe body is welded to the surface of the pipe body. In this context, the welding device is guided at the same angle relative to the pipe axis as the feed strip that forms the gills. In this case, the welding bead is as wide as the strip is thick. Very good results can already be achieved with the known method and it enables extremely fast and efficient processing. The object of the invention is to further optimise the known method and, in particular, to increase the production output and to enhance the quality of the gilled pipe to be produced. According to the invention, the object is solved in that a web has bent roughly at right angles on the strip that forms the gills before said strip is wound onto the pipe body, in that the web is guided flat on the pipe body during winding of the strip onto the pipe body, while the leg positioned roughly at a right angle thereto forms the gills, and in that welding is I Claim: 1. Method for producing gilled metal pipes, particularly heat exchanger pipes, where at least one continuous, gill-forming strip is applied to a rotating pipe body at a tangent and wound onto the pipe body in helical line, the side of the strip facing the pipe body is connected to the pipe surface by means of an electric welding device using an additional material, and the working end of the welding device is guided in the open wedge between the pipe surface and the winding strip, characterized in that a web has a lig bent at roughly right angles on the strip (4) that forms the gills before said strip is wound onto the pipe body (2), in and the web is guided flat on the pipe body (2) during winding of the strip (4) onto the pipe body (2), while the leg positioned roughly at a right angle thereto forms the gills, in that welding is carried out in the region of the open wedge between the pipe body surface (3) and the contact surface (10) of the web (6) facing the pipe body surface, 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) produced using the additional material is narrower than the width of the web (6). 2. Method as claimed in Claim 1, wherein the strip (4) forming the gills is bent into U-shape prior to winding onto the pipe body (2), and in that the roughly flat U-web (6) between the U-legs (7) is guided flat on the pipe body (2), while the two U-legs (7) positioned roughly at a right angle thereto form the gills. 3. Method as claimed in Claim 1 or 2, wherein the contact surface (10) of the web (6) is profiled prior to welding. 4. Method as claimed in Claim 3, wherein longitudinal ribs (15) are formed as the profile. 5. Method as claimed in Claim 3, wherein transverse ribs are formed as the profile. 6. Method as claimed in Claim 3, wherein nubs are formed as the profile. 7. Method as claimed in one of Claims 1 to 6, wherein the web (6) is provided with a bulge (16) facing away from its contact surface prior to welding. 8. Method as claimed in one of Claims 1 to 7, wherein with the help of the welding device and using the additional material, a welding bead is applied to the pipe surface (3) precisely in the connecting area between the web and the pipe body surface, before the web (6) to be welded contacts it, and in that the web is pressed into the still-molten welding bead. 9. Method as claimed in one of Claims 1 to 8, wherein the welding device (8) is guided at roughly the same angle to the axis of the pipe body as the feed strip (4) that forms the gills. 10. Method as claimed in one of Claims 1 to 9, wherein the web (6) is firmly pressed at least briefly against the pipe body (2) immediately after welding. 11. Gilled metal pipe as claimed in claim 1, particularly a heat exchanger pipe, comprising a cylindrical pipe body (2) and a/strip (4) wound onto it in a helical line, which is connected to the pipe surface by means of a weld produced with an electric welding device and using an additional material, characterized in that the strip (4) is provided with a web (6) running parallel to the pipe body surface/in that the contact surface (10) of the web (6) is welded to the pipe body surface (3),^ and in that the weld (5), consisting of additional material, is narrower than the width of the web. 12. Gilled pipe as claimed in Claim 11, wherein the contact surface (10) of the web (6) is profiled. 13. Gilled pipe as claimed in Claim 12, wherein longitudinal ribs (15) are provided as the profile. 14. Gilled pipe as claimed in Claim 12, wherein transverse ribs are provided as the profile. 15. Gilled pipe as claimed in Claim 12, wherein nubs are provided as the profile. 16. Gilled pipe as claimed in one of Claims 11 to 15, wherein the web (6) is provided with a bulge (16) pointing away from its contact surface (10). 17. Gilled pipe as claimed in one of Claims 11 to 16, wherein the strip is bent in L-shape, where the leg provided on the web forms the gills. 18. Gilled pipe as claimed in one of Claims 11 to 16, wherein the strip (4) is bent in U-shape, and in that the U-legs (7) provided on the U-web (6) are the same distance apart as the gills. 19. Gilled pipe as claimed in Claim 18, wherein the distance between two U-legs (7) of adjacent strip winds corresponds to the distance between the legs of the strip (4) Dated this the 4th day of October, 2002 [JAYANTA PAL] Of Remfry & Sagar Attorney for the Applicants

Documents:

in-pct-2002-1375-mum-cancelled pages(13-06-2007).pdf

in-pct-2002-1375-mum-claims(granted)-(13-06-2007).doc

in-pct-2002-1375-mum-claims(granted)-(13-06-2007).pdf

in-pct-2002-1375-mum-correspondence(27-06-2007).pdf

in-pct-2002-1375-mum-correspondence(ipo)-(26-06-2007).pdf

in-pct-2002-1375-mum-form 1(13-06-2007).pdf

in-pct-2002-1375-mum-form 1(25-06-2007).pdf

in-pct-2002-1375-mum-form 18(16-03-2004).pdf

in-pct-2002-1375-mum-form 1a(04-10-2002).pdf

in-pct-2002-1375-mum-form 2(granted)-(13-06-2007).doc

in-pct-2002-1375-mum-form 2(granted)-(13-06-2007).pdf

in-pct-2002-1375-mum-form 3(04-10-2002).pdf

in-pct-2002-1375-mum-form 3(13-06-2007).pdf

in-pct-2002-1375-mum-form 5(04-10-2002).pdf

in-pct-2002-1375-mum-form 5(13-06-2002).pdf

in-pct-2002-1375-mum-form-pct-ipea-409(13-06-2007).pdf

in-pct-2002-1375-mum-form-pct-isa-210(13-06-2007).pdf

in-pct-2002-1375-mum-petition under rule 137(13-06-2007).pdf

in-pct-2002-1375-mum-power of authority(13-06-2007).pdf

in-pct-2002-1375-mum-power of authority(16-10-2002).pdf