US3545496A - Fold flange tube and process and installation for producing such fold flange tubes - Google Patents

Fold flange tube and process and installation for producing such fold flange tubes Download PDF

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US3545496A
US3545496A US651836A US3545496DA US3545496A US 3545496 A US3545496 A US 3545496A US 651836 A US651836 A US 651836A US 3545496D A US3545496D A US 3545496DA US 3545496 A US3545496 A US 3545496A
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fold
fold flange
tubes
flange
welding
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Alfred Wogerbauer
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Voestalpine AG
Voest AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • B23K13/02—Seam welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal

Definitions

  • the invention relates to fold flange tubes made from two component sections joined by welding, at least one of said component sections comprising one or several fold flanges, and provides a process for producing such fold flange tubes from strip stock in a continuous manner and in a single plant, and an installation for carrying out this process.
  • FIG. I3 FIG. I30
  • FIG. I6 FIG. I60
  • FIG. I5 FIG. I50
  • FIG. 17 FIG. I70
  • Fold flange or lap tubes are increasingly used by building fitters, in portal building, and the like, for making doors, windows, frames, etc.
  • fold flange tubes were exclusively produced by reshaping of round tubes upon draw benches. This process is expensive, as it requires many separate steps and a considerable amount of material.
  • fold flange tubes are also produced in a tube welding plant where preshaped tubes instead of round tubes are made. Such tubes receive the desired shape by a final cold-draw. This process requires multiple-stand welding machines and complicated tooling equipment so that fold flange tubes produced by this process are expensive. With increasingly complicated shapes, this process becomes ever less economical. The limit is apparently a maximum of three fold flanges.
  • the invention aimsat avoiding these disadvantages and difficulties.
  • it has as its object to produce fold flange tubes from strip stock in a continuous manner and in a single plant.
  • a further object is the production of fold flange tubes of complicated shape, i.e. such having four to eight fold flanges, with a comparatively small set of tools.
  • the fold flange tube of the invention with which these objects are'achieved is characterized in that it is made from two component sections joined by welding, at least one of said component sections having one or several fold flanges.
  • the connecting welds lie opposite each other in a plane passing through the middle axis of the fold flange section.
  • the process of the invention for the production of fold flange tubes of the above characteristics comprises continuously passing two metal strips through successive shaping stations to form component sections of which at least one is provided with one or several fold flanges, and bringing said component sections together so that their edges to be welded face each other and joining said edges by butt welding to form a finished section.
  • the two strips are rolled into shape in. one plane parallel to each other, whereupon the component sections are twisted towards each other and'the edges are welded.
  • the strips are shaped to component sections in superposed planes and the two component sections are then vertically approached so that the edges which are to be welded contact.
  • the invention is illustrated in the drawing by way of several exemplary embodiments.
  • the process of the invention and the installations used for carrying out this process are diagrammatically illustrated in the drawing.
  • FIGS. 1, 2, 3, 4, 5, and 6 show six basic types of fold flange tubes according to the invention, FIGS. la, 2a, 3a, 4a, 5a, and 60, respectively, demonstrating the two components which are joined by welding to form the pertinent fold flange tube. These components can be traced back to the three basic shapes shown in FIGS. 7,8, and 9.
  • the basic shape shown in FIG. 7 has a trough-shaped profile and comprises the web 1, two fold flanges 2, and the projecting branches 3.
  • the basic shape according to FIG. 8 also has a trough'shaped profile and comprises web 1, one single fold flange 2, and branches 3, and the basic shape according to FIG. 9, which is simply U-shaped, comprises the web 1 and the two branches 3.
  • the height 17 of the two branches 3 as well as the width 0 of web 1 are equal in all these embodiments.
  • all combinations have the same interior cross section so that the types shown in FIGS. 1 to 6 are also interconnectable, e.g. by means of comer connections to form frames, without detracting from the stability of the construction as a whole.
  • FIGS. 10 and 10a show a modified embodiment in which, although the height of the branch is the same as shown in the basic shapes according to FIGS. 7 to 9, the width of the web 1 is smaller.
  • Such embodiments in which one dimension corresponds to that of the embodiments according to FIGS. 1 to 9 and the other dimension is smaller, can also be used in frames, for instance as cross bars.
  • FIGS. 11, 11a, 12, 12a, 13, 13a, 14, 14a, 15, 15a, 16, 16a, 17, 17a, and 18, 18a show further embodiments of fold flange tubes derivable from basic shapes of FIGS. 19 to 21 and eventually from those of FIGS. 7 to 9.
  • the basic shape according to FIG. 19 differs in that the web 1" has a steplike recess 4 continued in a fold flange 2, to which the one branch 3, which is longer by the thickness of the metal sheet than the other branch 3, is attached at right angles.
  • FIG. 20 shows two fold flanges 2 and 2 arranged at right angles to each other and to the one branch 3.
  • the basic shape according to FIG. 21 is characterized in that the fold flanges 2" are longer than in the previously described embodiments, and flexed, and have shorter branches 3.
  • the fold flange tube according to FIG. 11 is composed of a basic shape according to FIG. 19 and one according to FIG. 8; the fold flange tube according to FIG. 12 of one basic shape according to FIG. 19 and one according to FIG. 9, the fold flange tube according to FIG. 13 of one basic shape according to FIG. 8 and one according to FIG. 20, etc.
  • the fold flange tube according to FIG. 18 is composed of two basic shapes according to FIG. 21.
  • the welding seams 10 and 10 are arranged opposite each other in a plane x-x extending through the middle axis of the fold flange tubes.
  • FIGS. 22 and 23 one showing a lateral view and the other a top view, illustrate the process according to the invention in its continuous steps.
  • the starting material are two strips arranged in parallel in a horizontal plane, said strips being drawn off supply cylinders 100, The strips 11, 11 are passed over guide pulleys 12, 12' to form a loop and are then shaped to one of the basic shapes according to FIG. 8 (strip 11) or FIG.
  • strip 11 in a series of pairs ofshaping rolls: l3,13',14,14',15,l5',l6,16',l7,l7 as well as rolls 15a and 16a for strip 11, and pairs of shaping rolls 130, 140, 150, 160, 170, as well as rolls 150a and 160a for strip 11'. It must be remarked that in practice, depending upon the kind of component section to be made, more than five shaping stations are required.
  • FIG. 24 illustrates the production of a section similar to that of FIG. 19, showing the successive stages of the shaping process.
  • Stage (a) shows a flat strip 11 between two guide pulleys 110 and 11.0; in stage (b) a bead longitudinal of the direction of the strip is shaped by means of two shaping rolls 200, 200' and in stage (c) is rolled by means of two shaping rolls 201a to form a flat flange 2, while a further, smooth roll prevents warping of the shaped strip.
  • stages (d) and (e) the side flanges 2 and branches 3, 3' are preshaped by further shaping rolls 202, 202', and 203, 203.
  • stages (f) and (g) the flanges 2 and branches 3, 3' receive their final shape through rolls 204, 204, 205, 205', and the pair of rolls 2040.
  • stage (h) the step 4 in web 1' is formed by the rolls 206, 206', and the pair of rolls 206a.
  • the shaping rolls may be assembled from component parts so that sections of varying width can be produced with a small number of roll parts.
  • all the basic shapes according to FIGS. 7 to 9 and 19 to 21, respectively, as well as any desired modifications of these basic shapes can be produced.
  • FIGS. 22a and 23a show the continuation of the installation illustrated in FIGS. 22 and 23.
  • the component fold flange sections and 20' are twisted towards each other between the last pair of shaping rolls (17, 17', and 170, 170; FIGS. 22 and 23) and a twisting roll stand 210 comprising rolls 21, 21, 21" so that the branches 3, ,3 come to face each other, as shown in FIGS. 1a to 6a and 11a to 18a.
  • the facing component sections 20, 20' enter the welding machine 220.
  • the welding machine comprises, as known per se, a straddling device 230, e'.'g.
  • the welding process is based on the principle of bringing the edges of branches 3,,3' together at an acute angle to form a so-called notch wherearound the electric current circulates in'high concentration and effects the welding.
  • Numeral 26 denotes a rectifier', 2,7 a high frequency generator and 28a matching transformer.
  • 22 isfa cooling deviceand 30 a set of stretching and straighteningrollers'.
  • FIG. shows amedified version of the production process in which two series of shape rolling stands comprising pairs of shaping rolls are arranged in staggered relationship in a verti cal plane rather than side, by side'asin F IG. 23.
  • Strip ll enters the first series of shape rolling stands, three of which, 31, 31', 32, 32', and 33, 33, are illustrated, whereinstrip 11 isshaped as shown inFlG. 25:1 ,whilestrip 11' remains unshaped.
  • the second series of shape mung stands arranged behind and below the first series, whereof again three roll .pairs are designated by 310, 310', 320, 320', and 330, 330', the section 20 remains undeformed, as shown in FIG.
  • 25 is to be preferredif comparatively complicated profiles also in relation to each other, according to the dimensions e, d.
  • This adjustability has the purpose that, when using low frequency welding current, and when the fold flange tubes are unsymmetrical, the problem arises of uniformly heating the two butting branches.
  • a U-section branch having a fold flange lies opposite another branch having no such flange, the
  • FIGS. 28 and 29 show a preferred method of welding using:
  • the welding current is sup plied by way of an induction coil 41 surrounding the section at an even distance, which induces an adequate current in component sections 20 and 20' the circuit being closed by the buttingbranch edges which are thereby heated and joined.
  • Numerals 38 and 39 again denote the pressure rollers and numeral,40 the straddling'rollers.
  • a fold flange tube comprising, a pair of longitudinal component sections joinedtogether by butt welding, the welding seams being disposed opposite each other in a plane passing through the middle axis of said tube, at least one of said component sections having at least one fold flange disposed in a plane parallel to the plane defined by said welding seams.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Description

United States Patent [72] Inventor Alfred Wogerhauer Linz, Austria [21 Appl. No. 651,836 [22] Filed July 7, 1967 [45] Patented Dec. 8, 1970 [73] Assignee Vereinlgte Osterrelchische Eisen-und Stahlwerke Aktlengesellschalt Llnz, Austria 4 a company of Austria [32] Priority Aug. 9, 1966 [3 3] Austria [31 No. A7605/66 54] FOLD FLANGE TUBE AND PROCESS AND INSTALLATION FOR PRODUCING SUCH FOLD FLANGE TUBES 1 Claim, 50 Drawing Figs.
[52] U.S.Cl. 138/171, 219/59. 219/67; 138/156. 138/178 [51 Int. Cl. F161 9/22 Primary Examiner- Herbert F. Ross Atrorney- Brumbaugh, Graves, Donohue & Raymond ABSTRACT: The invention relates to fold flange tubes made from two component sections joined by welding, at least one of said component sections comprising one or several fold flanges, and provides a process for producing such fold flange tubes from strip stock in a continuous manner and in a single plant, and an installation for carrying out this process.
111/ II'I'III'III/IIIIIII/ PATENTED 050 81970 SHEEI 1 0F 7 F/G. F/G. la 4 H63 F/G.3a
FIG. 60
FIG. 50
FIG.9
FIG-7.7
FIG/O v NINVENTOR ALFRED WOGERBAUER HIS ATTORNEYS PATENTEU DEC 8 I970 saw 2 or 7 FIG. I? FIG. I20
FIG. I3 FIG. I30
FIG. I6 FIG. I60
FIG. I5 FIG. I50
F IG. I8 FIG. I80
FIG. 17 FIG. I70
FIG. 2/
FIG. 20
' FIG. 19'
HINVENTOR ALFRED WOGERBAUER HIS AT TORNEYS mama] 0E0 8mm 8.545496 sum 3 or 7 9 INVENTOR ALFRED WOGERBAUER HIS AT TORN EYS PATENTED DEB 81970 SHEET '4 0F 7 ww mt INVENTOR ALFRED WOGERBAUER HIS ATTORNEYS PATENTEDDEB 8197B SHEEI 6 0F 7 HIS AT TORNEYS PATENTED DEC 81910 SHEET 7 0F 7 INVENTOR ALFRED WOGERBAUER HIS ATTORNEYS FOLD FLANGE TUBE AND PROCESS AND INSTALLATION FOR PRODUCING SUCH FOLD FLANGE TUBES The invention relates to. a fold flange tube and to processes and installations for producing such fold flange tubes from metal strips.
Fold flange or lap tubes are increasingly used by building fitters, in portal building, and the like, for making doors, windows, frames, etc. Originally, fold flange tubes were exclusively produced by reshaping of round tubes upon draw benches. This process is expensive, as it requires many separate steps and a considerable amount of material. Further, fold flange tubes are also produced in a tube welding plant where preshaped tubes instead of round tubes are made. Such tubes receive the desired shape by a final cold-draw. This process requires multiple-stand welding machines and complicated tooling equipment so that fold flange tubes produced by this process are expensive. With increasingly complicated shapes, this process becomes ever less economical. The limit is apparently a maximum of three fold flanges.
The invention aimsat avoiding these disadvantages and difficulties. In particular, it has as its object to produce fold flange tubes from strip stock in a continuous manner and in a single plant.
A further object is the production of fold flange tubes of complicated shape, i.e. such having four to eight fold flanges, with a comparatively small set of tools.
The fold flange tube of the invention with which these objects are'achieved is characterized in that it is made from two component sections joined by welding, at least one of said component sections having one or several fold flanges.
Preferably, the connecting welds lie opposite each other in a plane passing through the middle axis of the fold flange section.
The process of the invention for the production of fold flange tubes of the above characteristics comprises continuously passing two metal strips through successive shaping stations to form component sections of which at least one is provided with one or several fold flanges, and bringing said component sections together so that their edges to be welded face each other and joining said edges by butt welding to form a finished section.
According to a modified embodiment, the two strips are rolled into shape in. one plane parallel to each other, whereupon the component sections are twisted towards each other and'the edges are welded.
According to another embodiment, the strips are shaped to component sections in superposed planes and the two component sections are then vertically approached so that the edges which are to be welded contact.
The invention is illustrated in the drawing by way of several exemplary embodiments. In addition, the process of the invention and the installations used for carrying out this process are diagrammatically illustrated in the drawing.
FIGS. 1, 2, 3, 4, 5, and 6 show six basic types of fold flange tubes according to the invention, FIGS. la, 2a, 3a, 4a, 5a, and 60, respectively, demonstrating the two components which are joined by welding to form the pertinent fold flange tube. These components can be traced back to the three basic shapes shown in FIGS. 7,8, and 9. The basic shape shown in FIG. 7 has a trough-shaped profile and comprises the web 1, two fold flanges 2, and the projecting branches 3. The basic shape according to FIG. 8 also has a trough'shaped profile and comprises web 1, one single fold flange 2, and branches 3, and the basic shape according to FIG. 9, which is simply U-shaped, comprises the web 1 and the two branches 3.
The fold flange tube according to FIG. 1 is thus composed of two component sections according to FIG. 8 having only one fold flange 2, the fold flange tube according to FIG. 2 of one basic shape according to FIG. 8 and one according to FIG. 9, the fold flange tube according to FIG. 3 of one basic shape according to FIG. 9 and one according to FIG. 7, etc., as evident from the drawing.
As shown in FIGS. 1 to 9, the height 17 of the two branches 3 as well as the width 0 of web 1 are equal in all these embodiments. Thus, all combinations have the same interior cross section so that the types shown in FIGS. 1 to 6 are also interconnectable, e.g. by means of comer connections to form frames, without detracting from the stability of the construction as a whole.
FIGS. 10 and 10a show a modified embodiment in which, although the height of the branch is the same as shown in the basic shapes according to FIGS. 7 to 9, the width of the web 1 is smaller. Such embodiments in which one dimension corresponds to that of the embodiments according to FIGS. 1 to 9 and the other dimension is smaller, can also be used in frames, for instance as cross bars.
FIGS. 11, 11a, 12, 12a, 13, 13a, 14, 14a, 15, 15a, 16, 16a, 17, 17a, and 18, 18a show further embodiments of fold flange tubes derivable from basic shapes of FIGS. 19 to 21 and eventually from those of FIGS. 7 to 9. For instance, the basic shape according to FIG. 19 differs in that the web 1" has a steplike recess 4 continued in a fold flange 2, to which the one branch 3, which is longer by the thickness of the metal sheet than the other branch 3, is attached at right angles. FIG. 20 shows two fold flanges 2 and 2 arranged at right angles to each other and to the one branch 3. The basic shape according to FIG. 21 is characterized in that the fold flanges 2" are longer than in the previously described embodiments, and flexed, and have shorter branches 3.
As shown, the fold flange tube according to FIG. 11 is composed of a basic shape according to FIG. 19 and one according to FIG. 8; the fold flange tube according to FIG. 12 of one basic shape according to FIG. 19 and one according to FIG. 9, the fold flange tube according to FIG. 13 of one basic shape according to FIG. 8 and one according to FIG. 20, etc. The fold flange tube according to FIG. 18 is composed of two basic shapes according to FIG. 21.
In all these embodiments, the welding seams 10 and 10 are arranged opposite each other in a plane x-x extending through the middle axis of the fold flange tubes.
FIGS. 22 and 23, one showing a lateral view and the other a top view, illustrate the process according to the invention in its continuous steps. According to this illustration, the starting material are two strips arranged in parallel in a horizontal plane, said strips being drawn off supply cylinders 100, The strips 11, 11 are passed over guide pulleys 12, 12' to form a loop and are then shaped to one of the basic shapes according to FIG. 8 (strip 11) or FIG. 19 (strip 11) in a series of pairs ofshaping rolls: l3,13',14,14',15,l5',l6,16',l7,l7 as well as rolls 15a and 16a for strip 11, and pairs of shaping rolls 130, 140, 150, 160, 170, as well as rolls 150a and 160a for strip 11'. It must be remarked that in practice, depending upon the kind of component section to be made, more than five shaping stations are required.
FIG. 24 illustrates the production of a section similar to that of FIG. 19, showing the successive stages of the shaping process. Stage (a) shows a flat strip 11 between two guide pulleys 110 and 11.0; in stage (b) a bead longitudinal of the direction of the strip is shaped by means of two shaping rolls 200, 200' and in stage (c) is rolled by means of two shaping rolls 201a to form a flat flange 2, while a further, smooth roll prevents warping of the shaped strip. In stages (d) and (e), the side flanges 2 and branches 3, 3' are preshaped by further shaping rolls 202, 202', and 203, 203. In stages (f) and (g), the flanges 2 and branches 3, 3' receive their final shape through rolls 204, 204, 205, 205', and the pair of rolls 2040. In stage (h), the step 4 in web 1' is formed by the rolls 206, 206', and the pair of rolls 206a.
The shaping rolls may be assembled from component parts so that sections of varying width can be produced with a small number of roll parts. In a similar manner, all the basic shapes according to FIGS. 7 to 9 and 19 to 21, respectively, as well as any desired modifications of these basic shapes can be produced.
FIGS. 22a and 23a show the continuation of the installation illustrated in FIGS. 22 and 23. The component fold flange sections and 20' are twisted towards each other between the last pair of shaping rolls (17, 17', and 170, 170; FIGS. 22 and 23) and a twisting roll stand 210 comprising rolls 21, 21, 21" so that the branches 3, ,3 come to face each other, as shown in FIGS. 1a to 6a and 11a to 18a. In this position, the facing component sections 20, 20' enter the welding machine 220. The welding machine comprises, as known per se, a straddling device 230, e'.'g. a mandrel 23 or pulleys 40, pressure rollers 24 24', 24", and two welding jaws 22 pressed against component sections 20,20, by means of a spring 22', said welding jaws receiving thej'requir'ed current through a welding current line 25. The welding process is based on the principle of bringing the edges of branches 3,,3' together at an acute angle to form a so-called notch wherearound the electric current circulates in'high concentration and effects the welding. Numeral 26 denotes a rectifier', 2,7 a high frequency generator and 28a matching transformer. 22 isfa cooling deviceand 30 a set of stretching and straighteningrollers'.
FIG. shows amedified version of the production process in which two series of shape rolling stands comprising pairs of shaping rolls are arranged in staggered relationship in a verti cal plane rather than side, by side'asin F IG. 23. Strip ll enters the first series of shape rolling stands, three of which, 31, 31', 32, 32', and 33, 33, are illustrated, whereinstrip 11 isshaped as shown inFlG. 25:1 ,whilestrip 11' remains unshaped. In the second series of shape mung stands arranged behind and below the first series, whereof again three roll .pairs are designated by 310, 310', 320, 320', and 330, 330', the section 20 remains undeformed, as shown in FIG. 25b, while the strip 11' is shaped to section 20'. In this modified version of the process the sections need not betwisted towards each other, but are vertically approached until the branch edges to be welded come to face each other, and are then welded in welding machine 220. The production process as illustrated in FIG.
25 is to be preferredif comparatively complicated profiles also in relation to each other, according to the dimensions e, d.
This adjustability has the purpose that, when using low frequency welding current, and when the fold flange tubes are unsymmetrical, the problem arises of uniformly heating the two butting branches. When a U-section branch having a fold flange lies opposite another branch having no such flange, the
branch of the U-section with fold flange would remain cooler than the branch without fold flange. The adjustability of the current supply rollers makes it possible to exclude differential heating.
FIGS. 28 and 29show a preferred method of welding using:
high frequency current supplied through sliding contacts 36 and 37. Numerals 38 and 39-again denote the pressure rollers, numeral 40 the straddling rollers.
According to FIGS. 30 and 31, the welding current is sup plied by way of an induction coil 41 surrounding the section at an even distance, which induces an adequate current in component sections 20 and 20' the circuit being closed by the buttingbranch edges which are thereby heated and joined. Numerals 38 and 39 again denote the pressure rollers and numeral,40 the straddling'rollers.
lclaim:
1. A fold flange tube comprising, a pair of longitudinal component sections joinedtogether by butt welding, the welding seams being disposed opposite each other in a plane passing through the middle axis of said tube, at least one of said component sections having at least one fold flange disposed in a plane parallel to the plane defined by said welding seams.
US651836A 1966-08-09 1967-07-07 Fold flange tube and process and installation for producing such fold flange tubes Expired - Lifetime US3545496A (en)

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AT760566A AT271829B (en) 1966-08-09 1966-08-09 Folded tube and method and device for the production of foldable tubes

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US2251967A (en) * 1936-08-05 1941-08-12 Carl M Yoder Machine for and process of forming structural members
US2821619A (en) * 1955-12-07 1958-01-28 Magnetic Heating Corp Continuous welding of strips and the like
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4930547A (en) * 1986-11-28 1990-06-05 Rijnstaal B.V. Powder-filled welded steel tube and method for the continuous manufacture thereof
US20030154815A1 (en) * 2000-04-06 2003-08-21 Roland Heiml Support casing for housing a steering shaft
US20060048597A1 (en) * 2000-04-06 2006-03-09 Thyssenkrupp Presta Aktiengesellschaft Support casing for housing a steering shaft
US6523575B1 (en) * 2000-11-15 2003-02-25 M&B Manufacturing Gutter outlet tube, stamping dies and method
US6520215B2 (en) * 2001-02-27 2003-02-18 Hayes-Albion Corporation Tubular bar with integral rolled locking system and method of making same
US6840571B1 (en) 2001-02-27 2005-01-11 Trim Trends Co, Inc. Tubular bar with integral rolled locking system and method of making same
US20120171506A1 (en) * 2009-09-29 2012-07-05 Jfe Steel Corporation Curved parts and method for manufacturing the same

Also Published As

Publication number Publication date
ES357795A1 (en) 1970-07-01
DE6606827U (en) 1970-11-19
DE7028323U (en) 1970-11-19
GB1198809A (en) 1970-07-15
ES357794A1 (en) 1970-04-01
US3603761A (en) 1971-09-07
AT271829B (en) 1969-06-10
YU32403B (en) 1974-10-31
ES141662U (en) 1969-04-01
YU167769A (en) 1974-04-30
DE1683700A1 (en) 1971-02-25
ES141662Y (en) 1969-10-16

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