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
  • B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
  • B23K28/02—Combined welding or cutting procedures or apparatus
• • 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
  • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
  • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
• • 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
  • B23K2101/32—Wires

Definitions

• 1 / invention relates to the field of hybrid welding combining laser welding as well as electric arc welding with metallic filler wire.
• the technical field of the invention relates to hybrid welding devices and methods in which electric arc welding implements a fusible electrode.
• Hybrid welding methods have been the subject of various embodiments in the prior art.
• the laser welding operation is carried out either using a laser source of the Nd-YAG type, or using a laser source of the C0 2 type.
• This welding method widely used in the industrial field, allows to perform narrow and deep welds at high speeds, generating only small deformations of the parts to be assembled. These advantages come essentially from the very high energy density provided by the laser beam used.
• TIG welding technique from the English “Tungsten Inert Gas”
• an electric arc is created and maintained between an infusible tungsten electrode and the part to be welded.
• the filler metal is brought manually or automatically with a motorized reel in a molten bath.
• an electric arc welding technique of the type using a plasma arc This technique is very similar to the TIG welding technique described above.
• the electric arc is created between an infusible electrode, preferably in tungsten, and the workpiece, inside a nozzle located in a special plasma welding torch.
• This nozzle allows the mechanical constriction or throttling of the electric arc through a calibrated orifice in a column of central or plasma gas, which generates a very high calorific energy.
• This energy calorific locally melts the part to be assembled as well as any filler wire added manually or automatically, in order to constitute a molten bath.
• the aim is therefore to provide an optimized welding process, both under the point e technical consideration by economic standpoint.
• the object of the present invention is to at least partially remedy the drawbacks mentioned above which the hybrid welding methods and devices of the prior art present.
• the object of the invention is therefore to present a hybrid welding device of simple design as well as a hybrid welding method suitable for being implemented by such a device, this device and this method allowing high welding speeds, while maintaining a high deposit rate.
• the invention firstly relates to a hybrid welding device comprising laser welding means as well as electric arc welding means with a fusible electrode.
• the device according to the invention is produced in such a way that the fusible electrode comprises a cross section of substantially rectangular shape.
• This specific characteristic of the invention advantageously gives the device the possibility of generating a higher deposition rate compared to that presented by the devices of the prior art at similar speed. Likewise, the welding speed can thus be increased, while maintaining a deposit rate identical to or higher than that obtained by the devices of the prior art.
• the substantially rectangular cross section of the fusible electrode comprises a width whose measurement extends between approximately 0.5 mm and approximately 0.6 mm, and a length whose measurement extends between approximately 3, 5 mm and approximately 4 mm.
• the fusible electrode is an electrode taken from the solid fusible electrodes and the cored fusible electrodes.
• the flow originating from the filling of powders, forms by solidifying a slag which protects and maintains the melt, especially for welding in position.
• This characteristic is particularly advantageous in the case of a bulky fusion bath, this case being notably encountered during operations of welding of pieces of great thickness, to prevent this bath from flowing by gravity.
• the laser welding means are chosen from the welding means using a laser source of the Nd-YAG type and the welding means using a laser source of the C 02 type.
• the arc welding means are chosen from among the welding means capable of implementing a MIG welding operation and the welding means capable of implementing a MAG welding operation.
• the invention also relates to a hybrid welding process simultaneously combining a laser welding operation as well as an electric arc welding operation with a fusible electrode.
• This method according to the invention is able to be implemented. work by a device such as that which is the subject of the invention and described above.
• FIG. 1 represents a schematic view of a device according to a preferred embodiment of the invention
• FIG. 1 shows a section taken along line A-A of Figure 1.
• the device 1a includes laser welding means 2 as well as electric arc welding means 4 with a fusible electrode 6.
• the means of. laser welding 2 have a laser source 8 of the Nd-YAG type or of the C0 2 type.
• a laser source 8 of the Nd-YAG type or of the C0 2 type can be used indifferently, the main difference between the two being that the source of the Nd-YAG type has a laser beam transport by optical fibers 10. Consequently, this specific characteristic results in better flexibility of the welding head.
• the laser beam 10 focuses on a part of the parts 3 consisting of a bath of molten metal 12.
• the arc welding means 4 are means using a fusible electrode 6.
• the metal supply for producing a weld bead 18 on the parts to be welded 3 is produced by the fusible electrode 6, which is consumed as this weld bead 18 is formed.
• the arc welding means 4 are indifferently means which can implement a MIG welding operation or means which can implement a MAG welding operation.
• the means 4 therefore comprise a welding torch 14 connected to a motorized reel (not shown) in which is located the fusible electrode 6, also called filler wire.
• An electric arc 16 is formed between the fusible electrode 6 and the parts to be welded 3, at the level of the molten metal bath 12.
• the two sets of welding means 2 and 4 therefore converge on the same bath of molten metal 12, their combination causing a synergistic effect in view of the welding characteristics obtained.
• the fusible electrode 6 is produced so that a cross section of this fusible electrode 6 is of substantially rectangular shape.
• a plasma column between the fusible electrode 6 and the parts to be welded 3 is widened, making it possible to limit the digging effect of an electric arc 16 and to increase the section of deposited metal. Due to the enlargement of the plasma, the rate of deposition of the filler wire on the parts to be welded 3 is thereby increased, which also provides the ability to increase the welding speed and / or the rate of deposit.
• the cross section of substantially rectangular shape comprises a width whose measurement extends between approximately 0.5 mm and approximately 0.6 mm, and a length whose measurement extends between approximately 3.5 mm and approximately 4 mm.
• a person skilled in the art can adapt these measures according to the various welding conditions which may arise.
• the fuse electrode 6 can be of any type. Indeed, it may be a solid fusible electrode, also called a solid filler wire, or else a cored fusible electrode. In this last case, there are in particular filled electrodes of the “basic” type or else of the “rutile” type, the use of such electrodes making it possible to obtain better resistance of the molten bath in position, in particular due to the presence of the slag.
• These filled fusible electrodes are in particular constituted by powders of the oxide and / or metallic type.
• fused cored electrodes makes it possible to further increase the welding speed and / or the deposition rate compared with the use of solid filler wires.
• the method according to the invention can be illustrated using FIG. 1. It in fact combines a laser welding operation as well as an electric arc welding operation.
• the method according to the invention is capable of being implemented by a hybrid welding device 1 such as that described above.
• This welding process one of the particular characteristics of which is to carry out electric arc welding with a fuse electrode 6 of cross section comprising a substantially rectangular shape, can be implemented in different ways.
• the fuse electrode 6 can take two separate positions on the welding torch 14. Note that the fuse electrode 6 can also be placed in any intermediate position , this position being between a transverse position and an aligned position, the choice being made according to the measures which the person skilled in the art wishes to adopt.
• the cross section of substantially rectangular shape of the fuse electrode 6 has a width and a length, then in a first case, the width of this section is perpendicular to the main direction of welding.

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=8869680

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (20)

Family Cites Families (9)

• 2001
  • 2001-11-22 FR FR0115122A patent/FR2832337B1/fr not_active Expired - Fee Related
• 2002
  • 2002-11-19 US US10/495,910 patent/US20050006355A1/en not_active Abandoned
  • 2002-11-19 EP EP02795383A patent/EP1446258A1/de not_active Withdrawn
  • 2002-11-19 WO PCT/FR2002/003943 patent/WO2003043776A1/fr not_active Application Discontinuation

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events