Electric heating – Metal heating – Of cylinders
Patent
1993-05-20
1995-04-04
Evans, Geoffrey S.
Electric heating
Metal heating
Of cylinders
52729, 219617, B23K 1100, B23K 1301, E04C 332
Patent
active
054039860
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a structural member and a process for continuous formation of said structural members.
Processes for continuous formation of structural members are well known. U.S. Pat. No. 3,427,427, for example describes a process for forming finned metal tubes by welding a double strip of metal helically about or longitudinally of a tubular member and then forcing apart the adjacent strips to form parallel helical or longitudinal cooling fins. A tubular member having one or more transverse flanges may also be formed by welding a double strip of metal to a planar flange member.
Reference is also made in U.S. Pat. No. 3,827,117 to a process and apparatus for forming truss members which comprise simultaneously forming channel members from a pair of endless strips, forming strut members from an endless third strip, then guiding the channels in a predetermined relation to each other with a continuous folded strut member therebetween and thereafter welding the apices of the struts to the channel members.
It is known in the art to form solid structural members such as I-beams, H-beams, Z-beams and T-beams wherein coils of steel are slit to width, designated as either flanges or webs and continuously fed through a high frequency forge welding mill wherein electrical contacts induce high frequency current which in turn creates a hot plastic metal region on the edges of the web and in the middle of the flanges. High pressure rolls then forge the plastic regions of the steels together metallurgically to produce a true forged weld without the use of filler materials. Exemplary of this process is U.S. Pat. No 3,713,205 which relates to a process for producing structural members such as I- or T-beams having one or two solid flanges attached to a web.
Other methods of producing solid flange structural members are descried in U.S. Pat. No. 3,199,174 which attaches flange strips to longitudinal edges of a web by fillet welds. U.S. Pat. Nos. 3,760,781, 3,713,205 and 4,586,646 also describe similar methods of forming structural members.
Conventional solid structural members have certain disadvantages which are described fully in Patent Specification PCT/AU89/00313 to the present applicant. These briefly include: increased costs for both corrosion protection and fire proofing; and reductions in section load bearing capacity due to local buckling considerations and the method of manufacture leads to production of substantial mill scale and rust.
The aforementioned PCT specification describes a structural member having a central web and a hollow flange extending along each edge thereof. This structural member is formed continuously from a single sheet of metal by a roll forming process. This structural member was found to be useful in many ways in that it simulated the strength characteristics of traditional hot rolled steel structural members such a I-beams, H-beams and RSJ's but without many of the disadvantages of such traditional structural members.
Hollow flanged structural members are described in Merson U.S. Pat. No. 3,342,007 and U.S. Pat. No. 1,377,251. The hollow side flanges are formed with a free edge positioned adjacent the web member but unsecured thereto. Other relevant prior art structural members are disclosed in Australian Design Registrations 81038, 81034, 82833 or 84401 which each disclosed a structural member formed from a multiplicity of separate components comprising a web and a pair of hollow flange sections all made from thin sheet material and wherein the edges of the web were received in the interior of each of the hollow end sections and abutted an internal surface of same. In each of these cases the process of formation was not described and thus the hollow flange sections could be press formed or roll formed for example. The web presumably would be attached to each hollow flange section by a spot welding process for example and thus does not suggest the economics of a continuous process nor does it suggest the strength characteristics inherent in structural members formed in accordance
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Evans Geoffrey S.
Tube Technology Pty. Ltd.
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