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
  • B23K1/00—Soldering, e.g. brazing, or unsoldering
  • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
• • 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
  • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
  • B23K26/20—Bonding
  • B23K26/21—Bonding by welding
  • B23K26/211—Bonding by welding with interposition of special material to facilitate connection of the parts
• • 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
  • B23K2101/00—Articles made by soldering, welding or cutting
  • B23K2101/006—Vehicles

Definitions

• the invention relates to a method for connecting metallic parts to be joined by brazing or welding.
• the invention further relates to an insert for carrying out the method.
• the connection of metallic parts (joining parts) by brazing or by welding is known.
• side parts and roof part of automobile bodies are connected to one another by brazing, the solder also filling or closing the joint between the parts and forming a surface that can be primed and painted without reworking, so that no measures have to be taken to cover the joint , as is the case with resistance or laser welding, particularly when the parts mentioned are overlapped.
• WO 02/064300 shows soldering with a burner and with preheating the solder wire. It is also known in practice to heat the joining parts to be soldered with a laser and also to insert the solder wire into the laser beam, so that the laser beam melts the solder wire.
• a weld connection for example a spot weld connection or a continuous or interrupted laser weld connection is carried out on overlapping sheets
• measures must subsequently be taken to cover the weld, for example by means of a subsequently inserted plastic profile, or complex measures for post-processing.
• the invention is based on the object of providing an improved brazed joint or welded joint which has closed or filled joints of good quality at high speed of the joining process, which joints can thus be used without or with minimal reworking and in particular can be painted over. This object is achieved with the features of claim 1.
• the inserted and welded or soldered insert reduces the amount of weld metal or solder required to fill the joint.
• the surface of the closed joint is very flat in the longitudinal direction.
• the sinking or drawing of the solder or weld metal into the joint base is prevented and the width of the bond area is defined.
• the amount of (expensive) solder required is reduced.
• the risk of pores is greatly reduced compared to soldering or welding without an insert. It has also been shown that a high connection speed of greater than 4 m / min. and especially 5 - 8 m / min. can be achieved.
• the insert is preferably a molded insert, the cross-sectional shape of which is not circular and an the joint shape is adapted, in particular in a triangular cross-sectional shape.
• Possible heat sources for the brazed connection or the welded connection are, for example, lasers, for example Nd: YAG, diode lasers, fiber lasers, in single-beam or double-beam or multi-beam technology, plasma sources, inductive heating, flames, combined (hybrid) sources.
• the method can preferably be used in body construction, in particular for connecting sheet metal, pipe, profile and solid parts which are built into the body in the visible area or invisibly and are painted over without reworking; also in the shell, when connecting sheet metal parts and in particular for connecting sheet metal with pipe parts.
• two parts with beveled flanges are provided as joining parts, or a flat or rounded part and a part with a beveled flange are provided, so that the joint is formed when positioning.
• the insert or molded insert can be a wire-shaped metal insert, for example made of steel, which has a round or an essentially triangular cross section, possibly with rounded corner regions.
• Such mold inserts can be produced, for example, from round wire by profiling rolls.
• the insert or molded insert is welded there after being inserted into the joint, for example by means of a laser welding system, for example by means of two laser beams.
• the mold insert is soldered in a manner known per se with the supply of a solder or a solder wire. It is preferred, however, that the insert or molded insert has a coating of solder that partially or completely surrounds it.
• the coating or cladding with solder is preferably selected with a thickness such that no additional solder has to be added when brazing.
• the amount of solder on the insert or molded insert can also be chosen in this way be that additional solder can be introduced when brazing.
• FIG. 1 shows an example of a brazed joint according to the invention
• Figure 2 shows another example of such a connection
• 3 shows another example of such a connection
• FIG. 4 shows an example of a welded connection according to the invention
• 5 shows a molded insert
• FIG. 6 shows an insert or a molded insert with a hard solder coating.
• FIG. 1 schematically shows the connection point between a joining part 1 and a second joining part 2.
• the joining parts are positioned against one another in such a way that an essentially notch-shaped or V-shaped joint 3 results between the joining parts 1 and 2.
• the joining parts 1 and 2 can be provided with folded flange parts 7 and 8, as a result of which the corresponding notch-shaped joint is formed when the joining parts are positioned next to one another for fastening them.
• FIGS. 2-4 show a view in which the joint runs perpendicular to the plane of the drawing and the connection area is shown in section (but without hatching).
• the joining parts 1 and 2 can be any e- be metallic part that can be connected by brazing or welding.
• a preferred area of application of the present invention is in body construction, so that the joining parts are, for example, a roof part 1 and a side part of an automobile body, in particular made of zinc-coated steel sheets.
• an insert 4 is now introduced into the joint 3 before the brazing or welding or possibly also during the brazing or welding, which at least partially fills the joint.
• FIG. 1 shows a first example in which the wire-shaped insert 4 has a circular cross section and is connected to both the joining part 1 and the joining part 2 by means of brazing by means of the soldering points 11.
• the joining parts 1 and 2 are thus also connected to one another.
• the solder 11 can also be effective directly between the joining parts 1 and 2, in that the solder also partially or completely fills the remaining cavity of the joint 3.
• the two joining parts 1 and 2 can also be connected to one another by further connecting means, for example by additional spot welds on the flanges 7 and 8.
• the braze 11 used can be supplied to the heat source in the form of a solder wire during the soldering and melted, so that it can wet and bond parts 1, 2 and 4 heated to soldering temperature.
• FIG. 2 shows a further brazed joint similar to that of FIG. 1, the same reference numbers again denoting the same parts.
• the insert 4 is here in the form of a molded insert 4 with a shape adapted to the notch-shaped joint 3.
• the insert 4 is an insert which is approximately triangular in cross section. This is like- therefore soldered in the joint with hard solder 11.
• the braze can in turn be supplied in wire form in a conventional manner.
• the insert 4 having a core or a core made of a metal, for example steel, which does not melt at the soldering temperature, and an envelope 5 made of solder which at least partially surrounds this core.
• the insert 4 can be inserted into the joint 3 and then the soldering can take place by means of the heat source shifting relative to the joint without the need to add further solder in the form of a solder wire or in any other way. However, this can be done in addition to the solder-coated insert 4.
• FIG. 4 shows a further embodiment, in which the same reference numerals designate the same elements.
• the joining part 1 in the joining area is a straight part without a bent flange.
• the insert 4 is in turn a molded insert.
• FIG. 4 shows the alternative procedure in which welding takes place instead of brazing. Again two joining parts 1 and 2 are shown, which form the joint 3 between them.
• an insert 4 has been inserted, which can be both a wire-shaped insert with a round cross section and a molded insert 4.
• a mold insert was used. This consists of a metal material with similar welding properties to the joining parts 1 and 2, so that a welding of the insert 4 with the joining parts 1 and 2 can be achieved by a welding heat source.
• two welding beams A and B are represented by arrows which, in a known manner corresponding to the welding process, bring about the melting regions 10 and 12, which result in the welding of parts 1 and 2 and 4.
• the welding beams A and B can be, for example, two laser beams which are derived from a laser beam source by means of a beam splitter.
• the welding beams are also correspondingly moved relative to the joint, either by moving the laser beam outlet openings over the stationary parts 1 and 2 and 4 or by moving the parts 1, 2 and 4 by means of a conveyor device in relation to the stationary laser exit points. This is known in principle and is not explained in more detail here.
• Figure 5 shows a corresponding mold insert
• FIG. 6 shows a mold insert 4 initially with a circular cross section (on the left in the figure), which can be formed into a mold insert (on the right in the figure) by the process of roll forming, which is only indicated by the arrow C.
• both mold inserts it is shown that they consist of a metal core 14 that does not melt during brazing and have a sheathing 5 made of brazing solder.
• the covering 5 can be arranged completely around the core 14, as shown, or can also only partially cover the core 14.
• the casing 5 can be carried out before or after the profiling step C.
• the sheath 5 can be achieved by pulling the core 14 through one or more times with a bath with liquid solder, or it can be arranged around the wire core 14 by an extrusion process.
• a configuration of the joining parts is not shown in the figures such that the edge to be connected areas have no bevelled edge areas and are perpendicular to each other, i.e. there is a T-joint.
• a shaped wire can then be inserted according to the invention in one of the throats (or in both throats) and welded or soldered to the joining parts. This achieves the advantages according to the invention in terms of surface quality and also increases the load-bearing capacity of the connection due to the enlarged connection surfaces.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Plasma & Fusion (AREA)
• Laser Beam Processing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34968083

Family Applications (1)

Country Status (5)

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• 2005
  • 2005-06-01 JP JP2007513652A patent/JP2008501527A/ja active Pending
  • 2005-06-01 CN CNA2005800181152A patent/CN1988981A/zh active Pending
  • 2005-06-01 WO PCT/CH2005/000306 patent/WO2005118211A1/de active Application Filing
  • 2005-06-01 US US11/628,189 patent/US20080017696A1/en not_active Abandoned
  • 2005-06-01 EP EP05741981A patent/EP1755819A1/de not_active Withdrawn

Non-Patent Citations (1)

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