KR20090066685A

KR20090066685A - Laser-arc hybrid welding apparatus and method

Info

Publication number: KR20090066685A
Application number: KR1020070134348A
Authority: KR
Inventors: 윤병현
Original assignee: 재단법인 포항산업과학연구원
Priority date: 2007-12-20
Filing date: 2007-12-20
Publication date: 2009-06-24

Abstract

A laser-arc hybrid welding machine and a welding method thereof are provided to prevent particle coarsening in a weld heat-affected zone by arranging arc and a laser in parallel. A laser-arc hybrid welding machine includes an arc torch(10) for arc discharge and a laser head irradiating a laser. The laser head is arranged to a coaxial direction of the arc torch. The laser irradiated from the laser head is a low output laser. The laser head and the arc torch are rotated around the arc torch.

Description

LASER-ARC HYBRID WELDING APPARATUS AND METHOD}

The present invention relates to laser-arc hybrid welding for thick plate steels. More particularly, the present invention relates to a welding apparatus and a welding method capable of suppressing generation of grain coarsening regions that degrade the mechanical properties of a weld by welding heat.

In general, in order to weld thick steel, multi-layer welding is required after machining the groove part. However, as the welding is performed several times as described above, a phenomenon in which particle size increases due to excessive heat is generated at the boundary between the weld and the base metal.

In the conventional case, the material of a specific component is included in the base material to suppress the generation of the grain coarsening region or the generation of the grain coarsening region by using a hybrid welding method using an arc and a laser.

However, the method of incorporating specific components into the base material has to be considered from the time of making the material, and it is difficult to apply the same principle to all materials because it requires a difficult process.

In addition, a conventional hybrid welding method using an arc and a laser uses a method that precedes an arc or a laser. In this case, a thick thick steel plate is difficult to weld or requires expensive high power laser equipment.

In addition, the laser irradiation directly above the arc welding portion has an effect of deepening the penetration depth, but does not fundamentally suppress the generation of the grain coarsening region, and still has the possibility of grain coarsening at the weld heat affected zone.

The present invention provides a laser-arc hybrid welding apparatus and a welding method capable of improving the welding quality by reducing the particle size in the heat affected zone of the weld.

To this end, the welding device is a laser-arc hybrid welding device including a laser head for irradiating a laser and an arc torch for arc discharge, wherein the laser head may have a structure arranged parallel to the arc torch.

Here, the laser head may be a structure in which the laser is irradiated only to the weld heat affected zone where the molten metal is in contact with the base metal or another welding layer.

In addition, the arc torch and the laser head may be a structure rotatable around the arc torch.

In addition, the laser irradiated through the laser head may be a low power laser.

On the other hand, in the laser-arc hybrid welding method, the welding part of the base material can be welded by melting the material with arc heat, and the welding heat affected part of the base material can be welded by irradiating a laser beam.

Thus, by arranging the arc and the laser in parallel, it is possible to prevent grain coarsening at the weld heat affected zone.

In addition, it is possible to weld a thick steel plate using a relatively inexpensive diode laser.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same structure, element or part that appears in more than one figure the same reference numerals are used in different embodiments to indicate corresponding or similar features.

1 is a schematic diagram for explaining a laser-arc hybrid welding structure according to the present embodiment.

As shown in FIG. 1, the welding device includes an arc torch 10 positioned at a welded portion A of the thick plate steel 100 to perform welding through arc discharge, and an arc on a side of the arc torch 10. It is provided in parallel with the torch 10 in a coaxial direction and includes a laser head 20 for irradiating a laser to the welding heat affected portion (B) position of the thick steel plate (100).

In the following description, the 'welding portion (A)' means a portion to be filled in the welded area after the welding material is melted by the arc heat, the 'welding heat affected portion (B)' is the welding portion (A) and the base material When welding is performed by the part where the contact is made or the multilayer, it means the contact area of one welding layer and the other welding layer.

The arc torch 10 is a component of an arc welding apparatus for welding a metal by generating an arc discharge by supplying a current to the tip, and the laser head 20 collects a laser beam generated from a laser oscillator through a condenser lens. As a component of the laser welding apparatus that finally irradiates the welding position, many techniques have already been disclosed.

Thus, in welding the thick steel plate 100 in a multi-layer, the main welding to the welding portion (A) is performed by arc welding by the arc torch 10, the welding heat affected portion (B) around the welding portion (A) The laser welding is performed by laser beam irradiated from the laser head 20.

In addition, the arc torch 10 and the laser head 20 are configured to be rotatable around the arc torch 10. Therefore, when welding the left position than the welding portion A shown in FIG. 1, the arc torch 10 and the laser head 20 may be rotated 180 degrees with the arc torch 10 as the axis to continuously perform welding. Will be.

Here, the distance between the laser head 20 to which the laser beam is irradiated and the arc torch 10 is not particularly limited.

In this way, the welding device has a structure in which the laser head 20 is installed in parallel with the arc torch 10, and when the arc torch 10 is positioned on the welding part A, the laser head 20 is welded (A). It is located on the welding heat affected part (B) of the periphery to perform welding for the corresponding position.

In this case, the laser irradiated through the laser head 20 is not a main welding but is welded to the welding heat-affecting portion B, so the depth does not have to be deep. Made of structure.

In the present embodiment, the arc welding by the arc torch 10 at the time of the arc welding is about 3 ~ 5mm, the laser welding device is applied a low-power diode laser that can penetrate the laser beam to a depth of 3 ~ 5mm. .

Referring to the welding method using the present laser-arc hybrid welding apparatus having such a configuration as follows.

When the thick steel plate 100 that is the base material is aligned and welding is started, the welding material is continuously supplied to the arc torch 10 for arc welding, and the welding material is melted by the arc heat of the arc torch 10 to be welded. Filled and welded.

The welding portion A is formed under the influence of the welding material emitted from the arc torch 10.

In addition, the laser beam irradiated from the laser head 20 disposed side by side on the arc torch 10 has a welding heat effect of contacting the welding portion A with the base material or one welding layer and the other welding layer. Irradiated to the portion (B) region.

As described above, the laser can be irradiated only to the welding heat affected part B, thereby preventing coarsening of particles in the weld heat affected part B. FIG.

After one layer is welded through the above process in the welding of the thick steel plate 100, the above process is repeated to weld another layer continuously. In this process, the laser beam of low power is continuously irradiated to the welding heat-affecting portion B, so that the particle size in the welding heat-affecting portion B can be reduced.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

1 is a schematic view for explaining a welding state by the arc-laser hybrid welding apparatus according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 arc torch 20 laser head

Claims

In the laser-arc hybrid welding device comprising a laser head for irradiating a laser and an arc torch for arc discharge,

And the laser head is disposed coaxially and parallel to the arc torch.

The method of claim 1,

The laser head is a laser-arc hybrid welding device having a structure for irradiating a laser only to the welding heat affected zone.

The method according to claim 1 or 2,

The laser-arc hybrid welding device, wherein the laser irradiated from the laser head is a low power laser.

The method of claim 1,

And the laser head and the arc torch are pivotable around the arc torch.

In the laser-arc hybrid welding method,

The arc-weld hybrid welding method in which arc welding is performed on the welded portion of the base material and laser welding is performed on the weld heat affected zone around the welded portion.

The method of claim 6,

A laser-arc hybrid welding method in which the laser irradiated to the welding heat affected part is a low power laser.