KR20190032774A - Laser vibration arc hybrid tandem welding apparatus - Google Patents

Abstract

The present invention relates to an apparatus to perform welding in a laser vibration arc hybrid scheme, which comprises: a body (10); a laser welder (20) installed on the center of the body (10); an arc welding means including front and rear arc welding torches formed on one side and the other side of the body (10), respectively; and a control means (50) to control an algorithm set to the laser welder (20), and the front and rear arc welding torches. According to the present invention, the apparatus applies a gap bridge scheme of simultaneously performing gap sensing and arc/laser output adjustment while welding a main plate with an excessive gap based on a torch and laser capable of adjusting vibration width, thereby providing effects of aiming improvement of welding quality, reduction of a deformation amount, increase of a welding speed, and reduction of cutting and processing man-hours due to application of V-shaped line opening.

Description

[0001] The present invention relates to an arc hybrid tandem welding apparatus,

TECHNICAL FIELD The present invention relates to an arc welding apparatus, and more particularly, to a laser oscillating arc hybrid tandem welding apparatus for welding a base material of a thick plate having an excessive gap.

The spot size of a laser which is generally used for laser welding or laser arc hybrid welding is 0.3 mm. When the root gap of the base material is more than 0.3 mm, welding is impossible because the laser beam is leaked between the base materials. In addition to the advantages of fast welding speed, good weld quality and beautiful beads, laser arc hybrid welding is also used to enable welding even with root gaps. This is a method of realizing a gap bridge effect in which weld metal melted at the time of arc precedes the root gap.

Related patent application No. 2016-0103483 provides a laser arc hybrid welding apparatus equipped with a vibrating torch. It is possible to control the real-time vibration width through gap sensing, but it is difficult to weld 1-pass in the case of a thick plate.

The following Korean Patent Publication No. 0656682 describes a method using a rotary arc torch to obtain a gap bridge effect. However, it is impossible to control the real-time amplitude because the rotation width is fixed.

Korean Patent Registration No. 1492143 discloses a torch body which is eccentrically fixed to the other end of a rotating shaft and eccentrically rotated to vertically flow the torch body. This is expected to reduce the number of welding passes, but it is insufficient to respond in real time when the gap of the base material becomes large.

Korean Patent Registration No. 0656682 "Laser-rotary arc hybrid welding apparatus and welding method using same" (published on December 13, 2006). Korean Patent Registration No. 1492143 entitled " Welding Wire High-Speed Vibration Device capable of Controlling Vibration Width and Frequency "(Published on Feb. 20, 2015).

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the related art by providing a gap bridging method in a welding process of an abacus having an excessive gap, adjusting a vibration width and an arc / laser output through real- Welded arc-hybrid tandem welding apparatus for welding pass welding.

In order to achieve the above object, the present invention provides an apparatus for welding by a laser oscillating arc hybrid method, comprising: a main body; A laser welder installed at the center of the main body; An arc welding means having a preceding arc welding torch and a following arc welding torch on one side and the other side of the main body; And control means for controlling the laser welder, the preceding arc welding torch, and the following arc welding torch with an established algorithm.

As a detailed configuration of the present invention, the arc welding means is characterized by comprising a preceding arc welding torch in front of the laser welding machine and a rear arc welding torch in the rear thereof.

As a detailed configuration of the present invention, the preceding arc welding torch and the following arc welding torch are connected to an angle adjusting unit for inducing the respective attitude variations.

As a detailed configuration of the present invention, the preceding arc welding torch and the following arc welding torch are connected to a vibrating part for inducing the weaving motion of each torch.

In the detailed configuration of the present invention, the distance between the trailing arc welding torch and the laser irradiation point is maintained at 1 to 3 mm, and the angle of the trailing arc welding torch is maintained at 45 degrees with respect to the vertical line.

As described above, according to the present invention, it is possible to improve the welding quality by applying the gap bridge method in which the oscillation width and the arc / laser power are adjusted by gap sensing while welding the abacus having an excessive gap based on the laser and the torch capable of controlling the oscillation width , The deformation amount is decreased, the welding speed is increased, and the cutting and machining time is reduced by applying the V improvement.

1 schematically shows a main part of an apparatus according to the invention;
Fig. 2 is a schematic view showing the main part of the device according to the invention in a side view
Fig. 3 is a graph showing the preparation for butt welding by the apparatus of the present invention,

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an apparatus for welding by a laser oscillating arc hybrid method. Laser arc hybrid welding for joining a base material having an excessive gap, but is not limited thereto. The excessive gap can be assumed to be a case where the root interval of the base material exceeds 1.0 mm.

The body 10 according to the present invention is configured in a form suitable for performing hybrid welding. In particular, the main body 10 of the movable structure for butt welding of the thick plate or the thin plate base material is preferred, but not limited thereto.

According to the present invention, a laser welder (20) is installed at the center of the main body (10). 1 illustrates a state in which the laser welder 20 is vertically installed at the center of the main body 10. As shown in FIG. The laser welder 20 is configured to irradiate the generated laser light to the laser irradiation unit 25, and irradiates the butt improvement unit 15 of the base material with the laser of the set standard. The spot size of the laser welder 20 is set to 0.3 mm.

In addition, according to the present invention, arc welding means includes a preceding arc welding torch 30 and a trailing arc welding torch 40 on one side and the other side of the main body 10. One torch is additionally mounted on the main body 10 of the laser arc hybrid welding apparatus, which is usually equipped with one torch. In the preceding arc welder and the following arc welder, the torch (30) (40), as well as the electrode feeder, the gas supply, etc., remain identical in the main configuration. The preceding and following are determined based on the direction in which the main body 10 moves along the improvement portion 15. [

In FIG. 1, reference numerals 32 and 42 denote nozzles of shield gas.

The arc welding means is characterized in that it comprises a preceding arc welding torch 30 forward and a rearward arc welding torch 40 rearward of the laser welder 20. 1 illustrates a state in which the preceding arc welding torch 30 and the rear arc welding torch 40 are formed in a V-shape in front of and behind the laser welding machine 20, respectively. The arrangement of the preceding arc welding torch 30, the laser welding machine 20 and the rear arc welding torch 40 overcomes the limit of the laser welder 20 (spot size 0.3 mm) It is a technical element that implements butt welding of the base metal. The operation and effect related to this configuration will be described with reference to the description of FIG. 3 to be described later.

As a detailed configuration of the present invention, the preceding arc welding torch 30 and the following arc welding torch 40 are connected to angle adjusting portions 34 and 44 for inducing respective attitude variations. The angle adjusting portion 44 of the trailing arc welder is configured such that the angle of the trailing arc welding torch 40 does not deviate from approximately 45 degrees with respect to the vertical line. It can be seen that a beautiful surface bead can be obtained when the angle of the trailing arc welding torch 40 is 45 degrees. Whereas the angle adjusting portion 34 of the preceding arc welder is configured such that the preceding arc welding torch 30 has a variation range of 30 to 45 degrees with respect to the vertical line. The distance (LD) between the trailing arc welding torch 40 of the trailing arc welder and the laser irradiation point is maintained at 1 to 3 mm. The distance between the preceding arc torch 30 and the laser irradiation point is preferably 1 to 3 mm. Therefore, since a laser and an arc are present together in one molten metal, deeper penetration can be secured in the same ingot.

As a detailed configuration of the present invention, the preceding arc welding torch 30 and the following arc welding torch 40 are connected to the vibration portions 36 and 46 for inducing respective weaving motions. The vibration units (36) and (46) can apply the configuration of the aforementioned Korean Patent Registration No. 1492143. However, it is preferable that the amplitude of the oscillation width for the weaving motion in the trailing arc welding torch 40 is relatively wider than that of the preceding arc welding torch 30. The vibration effect on the trailing arc welding torch 40 provides a sound weld without lack of fusion. In some cases, the vibrating portion 36 of the preceding arc welder may be excluded.

Further, according to the present invention, the control means 50 controls the laser welder 20, preceding arc welding torch, and trailing arc welding torch with a set algorithm. The control means 50 is based on a microprocessor, a memory, and a controller 52 equipped with an input / output interface. Control algorithms are stored and executed in memory as programs and data. A laser gap type detector 54 and the like are connected to the input interface. A laser welder 20, a leading arc welder, a trailing arc welder, etc. are connected to the output interface via a driver 56.

At this time, the laser welding machine 20, the preceding arc welding machine and the following arc welding machine can be individually operated, and laser welding, laser oscillation arc hybrid welding, laser oscillation arc hybrid tandem welding can be selected according to the thickness of the plate material.

On the other hand, the control means 50 adjusts the output of the laser / arc and the oscillation width of the arc welding means so that one-pass welding can be performed on the improvement portion 15 having a gap of 1 to 3 mm. The controller 52 inputs the gap sensing signal of the detector 54 and adjusts the oscillation width, the arc and the laser output of the torches 30 and 40 in real time via the driver 56. Thus, one-pass welding with respect to the improvement portion 15 having a gap of 1 to 3 mm is possible. Then, the improvement section 15 can apply the V improvement, not the Y or U improvement, which requires additional cutting and machining.

Referring to FIG. 3, the improvement effect of the butt welding according to the present invention is summarized by dividing the improvement part 15 of the thin plate and the backing plate into four cases. The leading arc welding torch 30 is referred to as a " leading torch ", the trailing arc welding torch 40 is referred to as a "trailing torch ", and L / F means a lack of fusion as one of welding defects.

In the case of a thin plate having a gap of 0 to 1 mm, one-pass welding is possible in a conventional manner, and according to the method of the present invention, the preceding arc welding torch 30 of the preceding arc welding machine is turned off, This is possible.

In the case of a thin plate having a gap of 1 to 3 mm, welding is not possible in a conventional manner, but according to the method of the present invention, the preceding arc welding torch 30 of the preceding arc welding machine applies vibration, This is possible.

In the case of a thick plate having a gap of 0 to 1 mm, the L / F between paths is easily generated in the conventional method and multi-pass welding is required. However, according to the method of the present invention, the preceding arc welding torch 30 of the preceding arc welding machine The trailing arc welding torch 40 of the trailing arc welder with added vibration is capable of one pass welding without L / F by adding vibration.

Although it is impossible to weld in the conventional manner in the case of a plate having a gap of 1 to 3 mm, according to the method of the present invention, vibration is added to the torches 30 and 40 of the preceding arc welder and the trailing arc welder, 1 pass welding is possible. It is also possible to apply the V improvement which excludes further cutting and machining.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: main body 15: improvement section
20: laser welding machine 25: laser irradiation part
30: preceding arc welding torch 32: nozzle
34: angle adjusting section 36:
40: Trailing arc welding torch 42: Nozzle
44: Angle adjusting part 46:
50: control means 52:
54: detector 56: actuator

Claims (5)

What is claimed is: 1. An apparatus for welding by a laser oscillating arc hybrid method comprising:
A main body 10;
A laser welder 20 installed at the center of the main body 10;
Arc welding means comprising a preceding arc welding torch (30) and a trailing arc welding torch (40) on one side and the other side of the body (10); And
And a control means (50) for controlling the laser welder (20), the preceding arc welding torch and the following arc welding torch with a set algorithm. The method according to claim 1,
Characterized in that the arc welding means comprises a preceding arc welding torch (30) at the front and a rear trailing arc welding torch (40) at the front about the laser welder (20). The method of claim 2,
Wherein the leading arc welding torch (30) and the trailing arc welding torch (40) are connected to angle adjusting portions (34) and (44) for inducing respective attitude variations. The method of claim 2,
Characterized in that said leading arc welding torch (30) and trailing arc welding torch (40) are connected to vibrating portions (36) and (46) for inducing respective weaving motions. The method according to claim 1,
Characterized in that the distance (LD) between the trailing arc welding torch (40) and the laser irradiation point is maintained at 1 to 3 mm and the angle of the trailing arc welding torch (40) Arc hybrid tandem welding device.

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