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
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/06—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of high energy impulses, e.g. magnetic energy
  • B23K20/08—Explosive welding
  • B23K20/085—Explosive welding for tubes, e.g. plugging

Definitions

• the invention relates to a method for increasing the corrosion resistance of weld seams of a metal body composed of parts, in particular a metal sheet or tube plated with a corrosion-resistant material, a metallic profile strip being placed on the welding zone and being explosively welded to the parts on both sides of the welding zone.
• this object is achieved in that the profile strip is initially punctiform or linear with at least one a part is thermally welded and then the weld joint is closed by thermal welding and the professional strip is welded together with the parts in an explosive manner, the sequence of closing the weld joint and the explosive welding being selectable.
• the professional strip can have any conceivable shape, such as a flat or thick rectangular profile, a rectangular profile with only curved edges, or an overall curved profile.
• the thickness of the professional strip can also be selected so that a stable connection of the parts is already produced by the dotting. This considerably simplifies the subsequent sealing of the weld joint and the explosive welding.
• Closing the weld joint only in the last process step can be expedient in particular if particularly large deformations (see claim 5) are desired in the case of explosive welding, such as, for example, a spreading of the parts in the region of the welding zone.
• the professional strip and the explosive charge form a composite. Because of the advantages mentioned, this method is also very suitable for use on site.
• a plano-convex professional strip is used, the convex side of which faces the weld joint. Since a professional strip of this kind only contacts the parts of the metal body during the explosive shaping, a particularly firm connection between the professional strip and the metal body parts can hereby be established.
• a professional strip with a web-shaped projection is used which engages in the weld joint.
• the prof actual tire can first be punctiform or linear at the level of the web-shaped front be thermally welded to the parts.
• the web-shaped projection can serve as a spacer for the parts of the metal body and thus automatically form a weld joint.
• flow of the sweat into the area of the cladding can be effectively avoided due to the web-shaped projection.
• the method according to the invention can also provide that the professional strip is first thermally welded to the cladding layers of the parts at certain points or in a line.
• the explosive charge provided for the explosive welding is dimensioned such that the parts of the metal body deform in the area of the professional strip during the explosive welding. In this way it can be achieved that in the area of the profile strip the parts of the metal body are locally replaced by the material of the profile strip.
• a V-shaped weld joint can also be formed automatically in the case of ends of the parts which initially abut flat due to this deformation.
• the curvature of the plane-convex profile strip is adapted to the deformation.
• a flat surface for example a continuously aligned inner tube surface
• the associated thickening of the metal body on the back can also be further processed in accordance with the application, for example to form an assembly aid for the finished metal body.
• a ring-shaped profile strip is used on the inside and / or outside of the metal tube.
• the ring-shaped professional actual tire serves as a centering ring (guide ring) when the metal tube is brought together.
• a plan-convex shape it can additionally be achieved that the pipe parts can be easily pushed into one another, fixed and then explosively welded to one another in a particularly effective manner.
• 1 is a section perpendicular to a weld joint through a metal sheet which is composed of two sheet metal parts and a plan-convex profile (at the time before the explosive welding),
• FIG. 2 is a corresponding sectional drawing, based on which the connection of two plated sheet metal parts is shown, 3 shows a sectional drawing which explains the method according to the invention when using a professional actual tire with a web-shaped projection (see also FIG. 3a),
• FIG. 4 shows a sectional drawing, in which two tubular metal body parts are shown, which are connected by means of a ring-shaped professional strip lying against the inside of the pipe and provided with a web-shaped projection,
• FIG. 5 shows a sectional drawing, in which a method example is shown, in which the parts of a metal sheet deform in the area of the professional strip during the explosive welding, and finally
• FIG. 6 shows a sectional drawing in which a corresponding deformation of a tubular, clad metal body is shown.
• the professional strip 3 which in this example has a plan-convex design, is first thermally welded to the two sheets 1, 2 with the convex side at its abutment point 4.
• an explosive charge 5 which is provided with a detonating cord 6, directly to the profile strip 3, as a result of which the professional strip 3 and the explosive charge 5 form a composite which is easy to handle.
• the professional strip 3 deforms in such a way that it fits tightly on both sides of the existing point-shaped connection at the abutment point 4 on the two sheets 1, 2 and is welded to them at the same time (not shown here). Subsequently, the still open weld joint 7 can be closed by thermal welding with a welding agent 8. However, it is also possible to first close the weld joint 7 and only then to carry out the explosive welding of the profile strip 3.
• FIG. 2 shows how this method can be applied to metal sheets each provided with a cladding 9, 10.
• the professional strip 3 with the convex sides is directly spotted at the point of impact 4 with the platings 9, 10 by thermal welding and then explosively welded analogously to FIG. 1.
• the actual tire 3 can here be made from the material of the plating 9, 10.
• the professional strip 3 is explosively welded to the sheet metal parts 1, 2, the professional strip 3 enters into a metallic connection with the respective plating 9, 10.
• annular professional strip 19 with a web-shaped projection 20 engages in a weld joint 7.
• the profile strip 19 also serves as an assembly aid, specifically as a guide ring when the tube parts 15, 16 are brought together.
• An explosive charge 21 with an ignition cord 22 is attached to the profile strip 19 from the inside.
• the web-like projection 20 is thermally welded to the cladding 17, 18 at the abutment point before the explosive welding.
• FIG. 5 it is shown on the basis of already explosively welded metal sheet parts 23, 24 how, by suitable dimensioning of the profile strip, it can be achieved that the profile strip 25 is aligned with the resulting metal sheet plane after the explosive shaping and welding.
• FIG. 6 shows the welding of two metal tube parts 26, 27, each of which is provided with a cladding 28, 29 from the inside.
• the profile strip 30 is also dimensioned such that its surface is aligned with the inside of the resulting metal tube after the explosive shaping and welding.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pressure Welding/Diffusion-Bonding (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6455866

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (2)

• 1992
  • 1992-04-02 DE DE19924211035 patent/DE4211035C1/de not_active Expired - Fee Related
• 1993
  • 1993-03-30 WO PCT/DE1993/000297 patent/WO1993019885A1/de not_active Ceased

Patent Citations (2)

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