JP2014069209A - Groove structure in laser-arc hybrid butt welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a groove structure in the laser-arc hybrid butt welding, capable of easily securing an appropriate amount of a root gap in the field to thereby perform good welding.SOLUTION: A groove structure is protrudingly provided with protrusions 5 each having a protrusion height d equivalent to a root gap G to be secured, respectively, on both sides of root faces 1a, 2a opposed to each other, and a minute width dimension with respect to the dimension of the root face. Those protrusions are disposed to be shifted with each other at the position in the board thickness direction of a welded member so as to be overlapped in the root gap direction, and the root gap G is secured by using the protrusions as criteria in the state.

Description

  The present invention relates to a groove structure in laser / arc hybrid butt welding in which two materials to be welded (for example, a thick steel plate or a thick steel pipe) are butt welded by using both laser welding and arc welding.

  FIG. 2 shows a groove structure in a conventional laser / arc hybrid butt welding. In the groove structure shown in this figure, a U-shaped groove 3 is formed on the surface side which is the laser irradiation side of the butted portion of the welded materials 1 and 2 which are two base materials, and a V-shape is formed on the back surface side. A groove 4 is formed, and the root faces 1a and 2a of both the workpieces 1 and 2 are brought into contact with each other. When performing arc welding while irradiating a laser to such a butted portion, the base material in the region indicated by Pa is melted and the filler material is added from the outside, so that the range indicated by P is solidified as a weld metal, Two workpieces 1 and 2 are joined.

  By the way, when a thick steel plate is welded by a laser-arc hybrid butt welding method, poor welding may occur due to dripping of molten metal. In order to prevent this, as shown in Patent Document 1, it has been found that it is effective to secure a route gap (gap) between the route faces 1a and 2a. However, it is very difficult to properly manage the root gap required for laser welding in the field. If the root gap is too large, the focused laser light passes through the gap as it is, and sufficient penetration is obtained. In addition, if the root gap is too small, there is too much penetration, which causes the problem of dripping of the molten metal.

JP 9-225663 A

  In view of the above circumstances, an object of the present invention is to provide a groove structure in laser-arc hybrid butt welding that can easily secure an appropriate amount of route gap on site and can perform good welding. And

  In order to solve the above-mentioned problems, the invention of claim 1 is a groove structure in laser-arc hybrid butt welding in which two materials to be welded are butt-welded by using both laser welding and arc welding. There are protrusion heights equivalent to the root gap to be secured on both surfaces of the root face facing each other at the groove of the butted portion of the welded material, and the width dimension in the plate thickness direction of the welded material is the dimension of the root face In contrast, a minute convex portion is continuously projected in the length direction of the abutting portion, and the convex portions of the both root faces are arranged with the positions in the thickness direction of the welded material being shifted from each other. The route gap is wrapped in the direction of the route gap, and in this state, the route gap is secured using the convex portion as a reference.

The invention of claim 2 is a groove structure in laser-arc hybrid butt welding according to claim 1, wherein the two welded materials are steel plates and the thickness thereof is 10 mm to 16 mm. A U-shaped groove is formed on the front surface in the laser irradiation direction in welding, and the projecting height of the projecting portion is set to 0.5 mm or more and less than 1.5 mm, and the projecting height of the projecting portion. Is 0.5 mm or more and less than 1.0 mm, a V-shaped groove having a depth of 3 mm or more is formed on the back surface in the laser irradiation direction.

According to the first aspect of the present invention, since the convex portion having a projection height corresponding to the root gap is formed on the root face in the groove, an appropriate amount of the root gap can be easily and accurately secured on the site by the convex portion. It becomes like this. Accordingly, it is possible to reduce the weight of the molten metal per unit volume (unit surface area), and it is possible to hold the metal that has been dripped down by the surface tension by the surface tension, and good welding can be performed. In addition, it is possible to manufacture a welded joint having a high output and an excellent penetration shape as compared with the case without a root gap.
Further, since the convex portions project from both sides of the root face facing each other, and the convex portions of the two root faces are arranged with the positions in the thickness direction of the welded material being shifted from each other, a manufacturing error is caused. Alternatively, when two welded materials are brought into contact with each other due to an assembly error or the like, even if a gap is generated between the tip of the convex portion and the flat surface of the other material welded root face facing the root, When viewed from the gap direction, the convex portion wraps, and the laser light can be prevented from passing through the root gap as it is.

  According to the second aspect of the present invention, the height of the protrusion provided on the route face is limited to a range of 0.5 mm or more and less than 1.5 mm, so that a route gap of 0.5 mm can be accurately secured. Accordingly, it is possible to avoid drooping of the back bead, which is a problem in laser-arc hybrid welding for thick steel plates. That is, when the protruding height of the convex portion is 0.5 mm or more and less than 1.0 mm, there is a possibility that a molten metal of about 3 mm may sag on the back surface, but a V-shape with a depth of 3 mm or more on the back surface. By forming the groove, dripping of the molten metal can be prevented, and the surface shape of the boundary between the base metal and the weld metal can be made smooth. In addition, when the protruding height of the convex portion is 1.0 mm or more and less than 1.5 mm, the surface shape of the boundary portion between the base material and the weld metal is smooth even without forming a V-shaped groove on the back surface. can do. In addition, if the protruding height of the convex portion is 1.5 mm or more, the base material is not sufficiently melted, and there is a possibility that the gap space is not filled with metal, resulting in a poor bonding state. By restricting the height to less than 1.5 mm, it can be avoided.

It is explanatory drawing of the groove structure of embodiment of this invention, (a) is sectional drawing of the groove structure of a butting | matching part, (b) is according to the protrusion height etc. of the convex part provided in the root face of a groove | channel. It is a figure which shows the result of having investigated the quality of welding. It is sectional drawing of the groove structure of the butt | matching part in the conventional laser arc hybrid butt welding.

Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B are explanatory views of a groove structure according to the embodiment, in which FIG. 1A is a cross-sectional view of a groove structure of a butt portion, and FIG. 1B is a projection height of a convex portion provided on a root face of the groove. It is a figure which shows the result of having investigated the quality of welding.

  The groove structure shown in FIG. 1 (a) is a groove structure in laser / arc hybrid butt welding in which two welded materials 1 and 2 are butt welded using both laser welding and arc welding. Protrusions 5 and 5 having projecting heights d corresponding to the root gap G to be secured are respectively provided on both surfaces of the root faces 1a and 2a facing each other at the groove of the butted portion of the materials 1 and 2. Yes. These convex portions 5 and 5 are convex portions having a rectangular cross section in which the width dimension e in the thickness direction (thickness t) of the workpieces 1 and 2 is minute relative to the dimension of the root faces 1a and 1b. It protrudes continuously in the length direction of the butted portion. Here, the width dimension e of the convex portion 5 is preferably as small as possible as long as it can maintain the strength that does not collapse when the root gap G is secured, and is set to about 0.5 mm, for example. .

  And the convex parts 5 and 5 of both these route faces 1a and 1b are made to wrap in the route gap direction by arranging the positions of the welded materials 1 and 2 in the plate thickness direction so as to be shifted from each other. The tip surfaces of the convex portions 5 and 5 are abutted against the other route faces 1a and 2a, thereby securing an appropriate amount of route gap G using the convex portions 5 and 5 as a reference. In addition, in FIG. 1, although it is the figure in which the clearance gap was formed between the front-end | tip of the convex part 5, and the flat surface of the to-be-welded material root face which opposes it, this is easy to see a figure. It is an important figure, and in fact, the tip of the convex portion 5 abuts against the flat surface of the root face of the other material to be welded facing it.

  Further, in this groove structure, a U-shaped groove 3 is formed in which half U-shaped cutouts 3a and 3a are combined on the laser irradiation side surface side of the butted portions of the two welded materials 1 and 2. doing. Here, the two welded materials 1 and 2 are steel plates, and the thickness t is 10 mm to 16 mm as an example, but the protruding heights d of both the convex portions 5 and 5 are both 0.5 mm or more. Are set to the same dimension of less than 1.5 mm. Moreover, the width dimension e of the convex part 5 is set to 0.5 mm.

  In addition, when the protrusion height d of the protrusions 5 and 5 is 0.5 mm or more and less than 1.0 mm, a V-shaped groove 4 having a depth h = 3 mm or more is formed on the back surface in the laser irradiation direction. doing. The V-shaped groove 4 has a shape in which the L-shaped notches 4a and 4b having a cut angle θ = 45 degrees are combined.

  When arc welding is performed while irradiating such a butted portion with a laser, the base material (the materials to be welded 1 and 2) indicated by Pa melts and a filler material is added from the outside, so that P The range shown is solidified as a weld metal, and the two workpieces 1 and 2 are joined.

  Next, the result of examining the quality of welding according to the protrusion height d of the convex portion 5 provided on the groove root face 1a, 2a will be described with reference to FIG. In the figure, good is indicated by “◯” and bad is indicated by “×”. Among the symbols “O” and “X”, “O” and “X” indicated by thin lines are bold lines when the depth h of the groove 4 on the back surface side is 0 mm (when the groove 4 is not present). “◯” and “×” shown are cases where the depth h of the groove 4 on the back surface side is 3 mm.

  Here, the height of the weld metal P is L. When the height d of the convex portion 5 is almost zero, the weld metal height L was small (8 mm), but “◯”, but when the weld metal height L was large (12 mm), the groove on the back side The welding result was “x” regardless of whether 4 is present (h = 3 mm) or not (h = 0 mm). Therefore, when the protrusion height d of the convex part 5 is substantially zero, it turns out that it is unsuitable for butt welding of a thick steel plate.

  Next, when the height d of the convex portion 5 was 0.5 mm or more and less than 1 mm, the welding result was “◯” only when the groove 4 on the back surface side with h = 3 mm was provided. Therefore, in the range of the height d of this convex part 5 (0.5 mm or more and less than 1 mm), it can be said that the groove | channel 4 of depth h = 3 mm or more provided in the back surface side is indispensable.

  Next, when the height d of the convex portion 5 was 1 mm or more and less than 1.5 mm, the welding result was “◯” in both cases of h = 0 mm and h = 3 mm. Therefore, in the range of the height d of this convex part 5 (1 mm or more and less than 1.5 mm), it can be said that the groove 4 on the back surface side may or may not exist.

  Next, when the height d of the convex portion 5 was 1.5 mm or more, the welding result was “x” in both cases of h = 0 mm and h = 3 mm. Therefore, it can be said that good welding cannot be performed in the range of the height d of the convex portion 5 (1.5 mm or more).

  As described above, in the groove structure of the present embodiment, the protrusions 5 and 5 having the protrusion height d corresponding to the root gap G are formed on the root faces 1a and 2a. The route gap G can be easily and accurately secured on site. Accordingly, it is possible to reduce the weight of the weld metal P per unit volume (unit surface area), and it is possible to hold the metal that has been dripped down by the surface tension by the surface tension, so that good welding can be performed. . Further, it is possible to produce a welded joint that has a high output and an excellent penetration shape as compared with the case without a root gap.

  Further, by limiting the projecting height d of the projections 5 and 5 provided on the route faces 1a and 2a to 0.5 mm or more and less than 1.5 mm, a route gap G of 0.5 mm can be ensured accurately. This makes it possible to avoid drooping of the back bead, which is a problem in laser-arc hybrid welding for thick steel plates. That is, when the protrusion height d of the convex portion 5 is 0.5 mm or more and less than 1.0 mm, there is a possibility that about 3 mm of molten metal sags on the back surface, but the depth h = 3 mm or more on the back surface. By forming the V-shaped groove 4, dripping of the molten metal can be prevented, and the surface shape of the boundary between the base material and the weld metal can be made smooth.

  Further, when the protrusion height d of the convex portion 5 is 1.0 mm or more and less than 1.5 mm, the surface shape of the boundary portion between the base material and the weld metal is formed without forming the V-shaped groove 4 on the back surface. Can be made smooth. Further, if the protrusion height d of the convex portion 5 is 1.5 mm or more, the base material may not be sufficiently melted, and the gap G portion space may not be filled with metal. By limiting the protrusion height d of the part 5 to less than 1.5 mm, it can be avoided.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The change of the structure of the range which does not deviate from the summary of this invention, etc. are included.
For example, in the said embodiment, although the two to-be-welded materials 1 and 2 to butt-weld showed the example of a steel plate, the two to-be-welded materials to butt-weld are not restricted to a steel plate, A steel pipe may be used, Of course, Other members may be used.
Further, in the above-described embodiment, the description has been given of the example in which a total of two convex portions 5 are provided across the workpieces 1 and 2, but the present invention is not limited to this, and even if there is one convex portion 5. Or a plurality of three or more.
Moreover, in the said embodiment, although the protrusion height d of the two provided convex parts 5 is set to the same dimension, it is not restricted to this, The upper and lower convex parts 5 along the upper and lower route gaps are protruded heights. You may vary the thickness.

1, 2 Workpieces 1a, 2a Root face 3 U-shaped groove 4 V-shaped groove 5 Projection d Projection height of projecting part e Projection width dimension h V-shaped opening on the back side Depth G root gap

Claims (2)

A groove structure in laser / arc hybrid butt welding in which laser welding and arc welding are used together to butt weld two workpieces,
The two welded materials have a projecting height corresponding to the root gap to be secured on both surfaces of the root face facing each other at the groove of the butted portion of the welded material, and the width dimension in the plate thickness direction of the welded material is the route. Convex protrusions that are minute with respect to the dimensions of the face are continuously projected in the length direction of the butted portion,
By arranging the convex parts of both the root faces in the thickness direction of the material to be welded so as to be shifted from each other, they are wrapped in the root gap direction, and in this state, the convex gap is used as a reference to the root gap. A groove structure in laser-arc hybrid butt welding, which is characterized by ensuring the above.   When the two materials to be welded are steel pipes or steel plates and the thickness dimension is 10 mm to 16 mm, a U-shaped groove is formed on the front surface in the laser irradiation direction in the laser welding, and the convex portion If the protrusion height of the protrusion is 0.5 mm or more and less than 1.5 mm, and the protrusion height of the protrusion is 0.5 mm or more and less than 1.0 mm, the depth of the protrusion in the laser irradiation direction is deep. 2. A groove structure in laser-arc hybrid butt welding according to claim 1, wherein a V-shaped groove having a thickness of 3 mm or more is formed.

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