JP5217726B2 - Welding equipment - Google Patents

Description

  The present invention relates to a hybrid welding apparatus that performs welding by combining laser welding and arc welding.

  There is a hybrid welding apparatus that performs welding by combining laser welding and arc welding, for example, MIG welding. In MIG welding, a shield gas, which is an inert gas, is sprayed on the molten pool to prevent oxidation of the molten metal.

  On the other hand, in laser welding, a laser beam is irradiated through a protective glass, and an air knife is used to prevent spatter from adhering to the protective glass. The air knife injects air in a direction perpendicular to the optical axis of the laser beam, and blows off the spatter scattered from the molten pool.

  A conventional hybrid welding method will be described with reference to FIG.

  In FIG. 4, 1 is a laser irradiation head, 2 is a MIG torch, 3 and 4 are members to be welded, 5 is a weld line, 6 is a shield trailer, and the shield trailer 6 is supported by a welding carriage (not shown). The wire 5 is covered over a required length and moved above the weld line 5. The laser irradiation head 1 and the MIG torch 2 are supported by a welding carriage (not shown), and can move integrally with the shield trailer 6 along the welding line 5.

  A condensing lens (not shown) is accommodated in the laser irradiation head 1, a protective glass (not shown) is provided at the tip of the laser irradiation head 1, and the laser beam 7 is transmitted by the condensing lens. The light is condensed and irradiated to the welding line 5 through the protective glass.

  The MIG torch 2 supplies a filler metal 8 from the center and generates an arc between the tip of the filler metal 8 and the molten pool 9. Further, an inert gas (shield gas) such as argon is jetted from the periphery of the filler metal 8 to the molten pool 9 and further fills the shield trailer 6 to shield the molten pool 9 with a shielding gas. The welded portion is covered over a predetermined length.

  In the figure, reference numeral 11 denotes an air knife gas nozzle attached to the shield trailer 6. Air (air knife) is jetted from the air knife gas nozzle 11 across the laser beam 7, and the air knife discharges the molten pool 9. The scattered spatter is blown away so that the spatter does not adhere to the protective glass. The air knife passes above the lower end of the MIG torch 2 and does not interfere with the flow of the shield gas.

  Next, as shown in FIG. 5, when there is a shielding object facing the air knife gas nozzle 11, such as when the welding line 5 is parallel to the wall surface 12, the air knife crosses the laser beam 7. After that, it collides with the wall surface 12. The collided air bounces off the wall surface 12 or spreads in all directions and is dispersed.

  Accordingly, part of the air flows backward toward the molten pool 9 and interferes with the flow of the shield gas. For this reason, the flow of the shielding gas is disturbed, the shielding property of the molten pool 9 is lowered, and the welding quality is deteriorated or the welding is poor. Alternatively, the flow of the air knife itself is disturbed, and the function of blowing the spatter is reduced.

JP 2006-68773 A

  In view of such circumstances, the present invention aims to improve the welding quality and the reliability by preventing the shielding gas from being deteriorated and preventing the shielding performance from being deteriorated even when there is an obstacle in the air knife blowing direction. Is.

  The present invention includes a laser irradiation head for irradiating a welding point with a laser beam, a welding torch for ejecting a shielding gas, an air ejection means for ejecting air so as to cross the laser beam, and the air ejection means. And a weld pool protector for separating the air flow from the shield gas.

  Further, the present invention relates to the welding apparatus, wherein the weld pool protector has a bucket shape having a bottom surface, a back surface, and a side surface, and the bottom surface and the back surface are connected via a curved surface, The surface is a shielding plate having a predetermined rigidity, the back surface and the side surface are thin plates surrounding the shielding plate, and the upper end of the thin plate relates to a welding apparatus reinforced by a core material, and also the molten pool The protective device is a member having a L-shaped cross section having a bottom surface and a back surface, and the molten pool protective device relates to a welding apparatus extending in a horizontal direction so as to cover the molten pool.

  According to the present invention, a laser irradiation head that irradiates a welding point with a laser beam, a welding torch that ejects a shielding gas, an air ejection unit that ejects air so as to cross the laser beam, and the air ejection unit, A weld pool protector provided oppositely, and the weld pool protector separates the flow of air from the shield gas, so that the air interferes with the shield gas and degrades the quality of welding. There is no.

  According to the present invention, the weld pool protector has a bucket shape having a bottom surface, a back surface, and a side surface, and the bottom surface and the back surface are continuous via a curved surface. It can be guided and the guiding direction can be limited by having a side surface.

  According to the invention, the curved surface is a shielding plate having a predetermined rigidity, the back surface and the side surface are thin plates surrounding the shielding plate, and the upper end of the thin plate is reinforced by a core material. The shielding plate can be easily shaped, and can be shaped to induce air effectively with a simple modification.

  Furthermore, according to the present invention, the molten pool protector is an L-shaped member having a bottom surface and a back surface, and the molten pool protector extends in a horizontal direction so as to cover the molten pool. In this case, the diffused air does not wrap around from the bottom of the molten pool protector and interferes with the molten pool.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, the same components as those shown in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted.

  The welding apparatus according to the present invention includes a laser irradiation head 1, an MIG torch 2, a shield trailer 6 that is supported by a welding carriage (not shown) and is movably provided, and is attached to the shield trailer 6. And an air knife gas nozzle 11 that can move together.

  Further, a wall surface 12 exists in front of the air knife gas nozzle 11, and a molten pool protection tool 13 is disposed between the air knife gas nozzle 11 and the wall surface 12. The molten pool protection tool 13 is provided in contact with the upper surface of the shield trailer 6, and the bottom surface of the molten pool protection tool 13 is ejected from the air knife gas nozzle 11 and the air knife gas nozzle 11. It is located below the flow of the air knife. The molten pool protector 13 is provided in a direction facing the air knife ejected from the air knife gas nozzle 11.

  Next, referring to FIG. 2, the details of the molten pool protection tool 13 will be described.

  The shape of the weld pool protector 13 is such that the front and upper surfaces are open, the cross section is U-shaped or substantially U-shaped, and the inner surface is inclined toward the wall surface 12 as it goes upward. Yes.

  The molten pool protector 13 includes an L-shaped or substantially L-shaped shielding plate 14 that the air knife ejected from the air knife gas nozzle 11 collides, and a rear and side surfaces of the shielding plate 14. The guide cover 15 is provided so as to be covered, and the core member 16 is provided on the upper end of the guide cover 15.

  The core 16 reinforces the induction cover 15 and bends the upper edge of the induction cover 15 in a U-shape to stabilize the shape.

  The shielding plate 14 has a bottom surface 14a and a back surface 14b continuous through a curved surface, is rigid so that the shape can be maintained, is nonflammable so that spatter may adhere, and has a predetermined heat resistance. It is made of a metal plate such as an aluminum plate.

  The induction cover 15 is made of, for example, an industrial aluminum tape that is easy to process and has a strength capable of maintaining the shape. As the guide cover 15 moves upward, the back surface 15a is inclined toward the back, and is bent from the back surface 15a to form a U-shaped or substantially U-shaped cross-sectional shape. It is constituted by a side surface 15b, and the back surface 15a and the back surface 14b are in close contact with each other. The core 16 that reinforces the guide cover 15 and keeps the guide cover 15 in a U-shape is made of an easily bendable member such as a wire or a welding wire.

  In addition, the said molten pool protection tool 13 may integrally form the member which has the rigidity which can maintain a shape, and the heat resistance and nonflammability with respect to adhesion of a sputter | spatter by press work.

  Hereinafter, a case where the welded members 3 and 4 are welded will be described.

  First, the laser irradiation head 1 and the MIG torch 2 that performs welding integrally with the laser irradiation head 1 are operated, and the laser irradiation head 1 is focused on a welding point by a condenser lens (not shown). Laser beam 7 is irradiated, filler metal 8 and shield gas are supplied from MIG torch 2, and an arc is generated at the tip of filler metal 8 to form molten pool 9.

  Simultaneously with welding by the laser irradiation head 1 and the MIG torch 2, the air knife gas nozzle 11 is operated to eject the air knife so as to be orthogonal to the optical axis of the laser beam 7.

  The spatter scattered from the molten pool 9 is blown off by the air knife ejected from the gas knife 11 for the air knife. The direction is changed upward along the guide cover 15, flows upward along the guide cover 15, and is discharged from the upper end of the guide cover 15.

  Further, since the shielding plate 14 is in close contact with the upper surface of the shield trailer 6 and the bottom surface 14a of the shielding plate 14 is positioned below the air knife ejected from the air knife gas nozzle 11, the air knife is located above the bottom surface 14a. As described above, since the shield gas is separated, the air knife collides with the wall surface 12 to flow backward, and does not interfere with the shield gas shielding the molten pool 9.

  As described above, the simple and inexpensive means of providing the molten pool protection device 13 at a position facing the air knife gas nozzle 11 prevents backflow of the ejected air knife, stabilizes the gas shield performance, and improves the welding quality. Can be improved.

  The shielding plate 14 may be made of a material that does not cause any problems even if spatter adheres to it, and if the induction cover 15 has sufficient strength and heat resistance, the outer periphery of the induction cover 15 is formed by the core material 16. It is possible to reinforce everything and omit the shielding plate 14.

  Next, a second embodiment of the present invention will be described with reference to FIG. 3 that are the same as those shown in FIG. 5 are given the same reference numerals, and descriptions thereof are omitted.

  As in the first embodiment, a laser irradiation head 1, an MIG torch 2, an air knife gas nozzle 11, and a shield trailer 6 to which the air knife gas nozzle 11 is fixed and movable together constitute a welding apparatus. Has been.

  A weld pool protector 13 ′ is provided on the shield trailer 6.

  The molten pool protection tool 13 ′ has an L-shaped cross section, is a horizontally long L-shaped member extending in parallel with the weld line 5, and covers the upper part of the molten pool 9. The bottom surface of the molten pool protection tool 13 ′ is in close contact with the upper surface of the shield trailer 6, and the bottom surface of the molten pool protection tool 13 ′ is located below the gas nozzle 11 for the air knife.

  Next, the case where the welded members 3 and 4 are welded will be described.

  Also in the second embodiment, similarly to the first embodiment, welding is performed by the laser irradiation head 1 and the MIG torch 2 that operates integrally with the laser irradiation head 1 to perform welding. At the same time, the air knife gas nozzle 11 is operated.

  Spatter scatters from the molten pool 9 generated by welding, and the scattered spatter is blown off by an air knife ejected from the gas knife 11 for the air knife and adheres to the molten pool protection tool 13 '.

  The air knife blown off the sputters collides with the molten pool protection tool 13 ', and the air diffuses upward or horizontally. Further, the air flow converted in the horizontal direction flows out in the horizontal direction beyond the molten pool 9, and does not interfere with the shielding gas.

  Also in the second embodiment, the bottom surface of the molten pool protection tool 13 ′ is in contact with the top surface of the shield trailer 6, and the bottom surface of the molten pool protection tool 13 ′ is ejected from the air knife gas nozzle 11. Therefore, the air knife flows above the bottom surface of the molten pool protection tool 13 ', and the shield gas supplied from the MIG torch 2 flows below the bottom surface of the molten pool protection tool 13'. Therefore, the air colliding with the molten pool protection tool 13 'does not flow backward and interfere with the shield gas.

  With respect to the second embodiment as well, the back flow of the air knife ejected from the air knife gas nozzle 11 can be prevented by simple and inexpensive means, and the quality of welding can be improved.

  It should be noted that the molten pool protection device 13 may be any device as long as it separates the flow of the air knife from the shield gas and avoids interference between the air knife and the shield gas. It may be a horizontal flat plate with portions omitted.

It is a perspective view which shows the 1st Embodiment of this invention. It is a principal part expansion perspective view which shows the 1st Embodiment of this invention. It is a perspective view which shows the 2nd Embodiment of this invention. It is a perspective view which shows the conventional Example. It is a perspective view which shows the conventional Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser irradiation head 2 MIG torch 6 Shield trailer 9 Molten pool 11 Gas nozzle for air knife 12 Wall surface 13 Molten pool protector 14 Shielding plate 15 Guidance cover 16 Core material

Claims (2)

A laser irradiation head for irradiating a welding point with a laser beam, a welding torch for jetting a shielding gas, an air jetting unit for jetting air so as to cross the laser beam, and an air jetting unit. A weld pool protector, and the weld pool protector has a bucket shape having a bottom surface, a back surface, and a side surface, the bottom surface and the back surface are continuous via a curved surface, and the air flow is A welding apparatus that is separated from shielding gas. The welding apparatus according to claim 1 , wherein the curved surface is a shielding plate having a predetermined rigidity, the back surface and the side surface are thin plates surrounding the shielding plate, and an upper end of the thin plate is reinforced by a core material.

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