Classifications

• • 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
  • B23K9/00—Arc welding or cutting
  • B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
  • B23K9/0043—Locally welding a thin plate to a thick piece
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F1/00—Tubular elements; Assemblies of tubular elements
  • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
  • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element

Definitions

• the present invention concerns a heat transfer member comprising a rib-like heat transfer part welded to a base.
• the present invention also concerns a procedure for producing said heat transfer member.
• heat transfer member e.g. a rib
• the heat transfer member is either welded with a continuous fillet weld or with alternating spot welding.
• the weld is extended either merely on one side or on both sides of the heat transfer rib.
• the aim of the invention is to provide a heat transfer member, and a procedure for producing same, in said heat transfer member and in said procedure the numerous drawbacks of the designs of prior art mentioned being avoided.
• a further aim is to provide a heat transfer member and a procedure for producing same such that heat transfer members can be placed in more closely spaced succession en the base than before.
• the aim of the invention is attained with a heat transfer member structure which is mainly characterized in that the heat transfer element has a cross section substantially making it a U section, this being attached to the base by its bottom part by penetration welding, the bottom part part of the U section being mixed with the weld.
• the invention also concerns a procedure for producing a heat transfer structure which is mainly characterized in that between the flanges of the substantially U-shaped heat transfer member is introduced a welding tool and penetration welding of the bottom part of said heat transfer member to the base is carried out, whereby the bottom part of the U section fuses and becomes mixed with the weld that is produced.
• Fig. 1a the attachment to the base of a heat transfer rib as knewn in the art is presented.
• one heat transfer rib has been attached using one-sided continuous welding, and the other heat transfer rib is attached with alternating welding on both sides.
• Fig. 1b is presented a design of prior art in which the heat transfer member is attached using continuous welding on both sides.
• m Fig. 1c is presented the structure of Fig. 1b, in elevational view.
• Fig. 2a is presented a first advantageous embodiment of the heat transfer meniber of the invention, in sectional projection.
• the heat transfer rib element has not yet been attached to the base.
• Fig. 2b is presented the heat transfer rib element of Fig. 2a in elevational view.
• Fig. 3a is presented the attaching process of the rib part of the heat transfer member of the invention to the base.
• the figure is a sectional projection, and the welding tool has been included in the presentation.
• Fig. 3b is presented the attachment procedure of Fig. 3a, in elevational view.
• the heat transfer rib part has been partly cut open in the projection of the figure, in order to show the welding tool.
• Fig. 4a is presented a second advantageous embodiment of the heat transfer member of the invention.
• Fig. 4b is presented a third advantageous embodiment of the heat transfer member of the invention.
• Fig. 4c is presented the heat transfer rib part of Figs 4a and 4b, welded to the base in penetration through its bottom part.
• Fig. 4d is presented the structure of Fig. 4c in elevational view, and partly cut open.
• a fourth embodiment of the heat transfer member of the invention is presented in sectional projection.
• the figure shews three heat transfer members which have a cross section of T shape.
• a U section profile has resulted from penetration welding to the base of two T sections.
• Fig. 6 is presented a fifth advantageous embodiment of the heat transfer member of the invention, a U section having been formed of two L sections.
• Fig. 7 is presented a sixth embodiment of the heat transfer member of the invention, in which the heat transfer member is c ⁇ posed of two parts having a cross section of L shape and their bottcm parts formed to be curved prior to penetration welding.
• Fig. 1a is presented a design conforming to the state of art, in which the rib parts r 1 and r 2 have been attached by welding to the base.
• the rib part r 1 is attached by a continuous one-sided weld k 1
• the rib part r 2 is attached by welding the rib part on both sides to the base m with alternating welds k 2 .
• Fig. 1b is presented the attachment of the rib part r 3 to the base m by welding, using a continuous weld k 3 on both sides.
• Fig. 1c is presented the rib r 3 of Fig. 1b in elevati ⁇ nal view.
• the rib r 3 is a plate-like part.
• the whole rib structure is formed in that such plater-like rib parts r 3 have been placed in a row with a given spacing.
• the welding tool requires a lot of space because it must be introduced at a certain angle to the welding point. Therefore ribs cannot be placed very close to each other.
• a heat transfer member 10 In Fig. 2a is presented a heat transfer member 10 according to the invention.
• the heat transfer member 10 consists of a rib-like heat transfer element 11 substantially U-shaped in cross section, comprising a first vertical flange 12 and a second vertical flange 13, and a bottom part 14 therebetween.
• Ihe bottcm part 14 has the lower surface 16 and the upper surface 15.
• said rib like heat transfer element 11 has been positioned on a base 17, suitably a water jacket. The figure illustrates the situation prior to the penetration welding as taught by the invention.
• Fig. 2b is shewn the design of Fig. 2a in elevati ⁇ nal view.
• the presentation of the figure shows that the rib-like heat transfer element 11 consists of separate flange elements A1, A2, A3, etc. spaced with reference to each other.
• the flange components may equally be continuous sheet components.
• the rib-l ⁇ ce heat transfer element 11 then consists of a comtinuous first vertical flange component 12 and a continuous second vertical flange component 13. Said components are joined by a bottcm part 14.
• Fig. 3a and 3b is presented the attachment of the rib-like heat transfer part 11 of the invention, depicted in Figs 2a and 2b, by penetration welding to the base 17.
• the base 17 may be e.g. the water jacket of a boiler.
• the welding tool is introduced in the space between the first vertical flange 12 and the second vertical flange 13 of the rib-like heat transfer element 11.
• the welding tool appropriately a welding rod S, is carried close to the bottom part 14.
• Between the bottom part 14 and the welding rod or other welding tool S is generated a high voltage, whereby an electric arc e can be lit.
• the bottom 14 fuses and becomes mixed with the supplementary material from the welding rod, thus reducing the quantity of supplementary material needed.
• it promotes the turning through of the bottom part 14.
• the need of shielding gas will be minimal because losses of shield ing gas are avoided as the vertical flanges 12,13 efficiently concentrate the shielding gas an its proper target.
• the heat transfer members can be placed with close spacing because the welding process itself imposes no restricti ⁇ ns an closely adjacent placement of the heat transfer members.
• Fig.4a is presented another advantageous embodiment of the heat transfer member of the invention, in cross-section, prior to the penetration welding step.
• the rib-like heat transfer element 21 consists of a section with substantially Ushaped cross section, comprising vertical flange parts 22 and 23 and a substantially straight bottom part 24 joining them.
• the presentation of the figure refers to the phase prior to penetrationwelding the rib-like heat transfer member 21 to the base 17.
• Fig. 4b is presented a third embodiment of the heat transfer member of the invention in sectional projection, before the penetration welding step.
• the rib-like heat transfer element 31 is again composed of two vertical flange sections, namely, a first vertical flange section 32 and a second vertical flange section 33, and of a bottom part 34 therebetween.
• said bottcm part 34 is composed of sections h 1 and h 2 which before the penetration welding are placed slightly apart.
• Fig. 4c are presented the embodiments of Figs 4a and 4b subsequent to penetration welding.
• the welding tool S e.g. advantageously a welding rod
• the welding tool S is introduced in the space between the first and second vertical flanges 22 and 23, and 32 and 33, of the rib-like heat transfer elements 21 and 31 and penetration welding is carried out, whereby material of the lands 24 and 34 is fused and becomes mixed with supplementary material from the welding rod, or other welding tool s, a weld 18 being produced which fixes said rib-like heat transfer parts 21 and 31 to the base 17.
• part of the material of the base 17 fuses and becomes mixed with the material of the land and with the supplementary welding material supplied with the welding tool.
• Fig. 4d is presented the design of Fig. 4c, in elevational view.
• Fig. 5 is presented a fourth advantageous embodiment of the heat transfer member of the invention, in sectional projection.
• the rib-like heat transfer part 41 consists of a first vertical flange part 42 and a second vertical flange part 43. Said vertical flange parts 42 and 43 have been formed of T-shaped sections.
• the T sections Prior to the penetration welding step, the T sections are placed side by side either with their bottom parts touching or separated by a given distance.
• the bottom part 34 is constituted by these halves h 3 and h 4 of the bottom parts of T sections, and after penetration welding these halves of the bottom parts will be joined by a weld 18.
• Fig. 5 have been shewn the T section en the extreme right in the figure and the T section in the centre, placed at a given distance from each other and before penetration welding, and in the presentation of Fig. 5, the section on the left and that in the centre are shewn as they appear after the penetration welding step, the weld 18 forming the ultimate U section and joining said rib-like heat transfer member 41 to the base 17.
• Fig. 6 is presented a fifth advantageous embodiment of the heat transfer member of the invention in sectional projection and prior to penetration welding.
• the rib-like heat transfer element 51 once again substantially a U section after the penetration welding, is composed of a first vertical flange part 52, a second vertical flange part 53 and a land 54 connecting them.
• U section is c ⁇ iposed of two separate elements which are substantially L-shaped so that the bottom part h 5 which is part of the first vertical flange part 52 is placed against the base 17 and on the top surface of said section h 5 is placed the bottom part h 6 which is part of the second vertical flange part 53.
• penetration welding (not depicted in the figure) will be carried out by introducing a welding tool S in the space between the vertical flange parts 52 and 53 and accomplishing the welding by fusing the material of the bottom parts h 5 ,h 6 so that it becomes mixed with the welding material supplied with the welding tool.
• Fig. 7 is presented a sixth advantageous embodiment of the heat transfer member of the invention, prior to penetration welding.
• the rib-like heat transfer element 61 comprises a first vertical flange part 62 and a second vertical flange part 63, and a land 64 therebetween, the first vertical flange part 62 having prior to penetration welding a cross section that makes it substantially an L section.
• Its bottom part h 7 is substantially curved.
• the second vertical flange part 63 is likewise an L section, as to its cross-sectional shape, and its bottom part h 8 is likewise curved.
• These bottom parts h 7 and h 8 have been placed one upon the other prior to penetration welding.
• the presentation of Fig. 7 illustrates this configuration. Between the bottom part 64 produced in this manner and the base 17 is formed an advantageous air gap. Thereafter, penetration welding is carried out in the manner already described in connection with Figs 3a and 3b.
• Said U section is moreover easy to make in punching and pressing work steps and dimensionally accurate units are thus obtained, which is one of the fundamental prerequisities for automation. Furthermore, when the welding procedure of the invention is applied and when the welding tool is introduced between the two vertical flanges of the rib-like part, the quantity of shielding gas required is reduced, firstly fewer welds are required and secondly because the flange elements concentrate the shielding gas efficiently an the welding area. This is instomental in avoiding excessive gas losses. In the procedure of the invention MIG welding, MAG welding, core-filled wire welding and common rod welding can be applied.
• the heat transfer members of the invention are advantageously welded using welding robots and applying the procedure of the invention. First, the pre-positioning of the heat transfer member on the base is carried cut, and thereafter the penetration welding of the heat transfer rib structure to the base is carried out employing welding robots.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Geometry (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Plasma & Fusion (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8521495

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (9)

• 1985
  • 1985-10-11 FI FI853965A patent/FI75666C/fi not_active IP Right Cessation
• 1986
  • 1986-10-10 WO PCT/FI1986/000115 patent/WO1987002443A1/en unknown

Patent Citations (9)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events