JPH0520190B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for cutting back a cladding material by peeling off the surface layer at the edge of the cladding material, and in particular employs a laser beam as the removal means. The present invention relates to a method for cutting back clad material.

[Prior Art] A plate material having a structure in which a plurality of layers of different materials are laminated is called a clad material. For example, in pressure vessels and the like, clad steel having multiple steel layers is often used.

To weld this clad steel, as shown in Figure 3, the surface layer (laminated material) 1 is peeled off and removed, and the base metals 2 are welded together (numeral 3 indicates weld metal). There are many things. This is laminating material 1
When welding together with base metal 2, the components of laminate 1 mix with the components of base metal 2 and weld metal 3, resulting in dilution of the components, resulting in a decrease in corrosion resistance or a decrease in the strength of the welded part. This is because it is brought about.

This process of removing the surface layer of the laminated material 1 and the like is called cutback.

Conventionally, cutback of cladding material has been carried out using various cutting devices and tools.

FIGS. 4 to 9 show an example of this method. In the method shown in FIG. The cutter 7 is moved along the frame portion 5 to cut back the joining material at the edge of the cladding material 6. FIG. 5 is a cross-sectional view of the edge of the clad material 6 after being cut back, and reference numeral 8 indicates a stepped portion formed by the cut back.

In the cutback method shown in FIGS. 6 and 7, cuts 10 are first made in the laminate 1 using a grinder 9, and then the edges of the laminate 1 are peeled off using a tool 11 to perform cutback. Note that a grinder finish is usually applied after stripping with a tool.

In the cutback method shown in FIGS. 8 and 9, gouging is first performed along the peripheral edge of the opening 12 of the clad material 6, and then finishing is performed using a grinder 9.

[Problems to be Solved by the Invention] As mentioned above, conventionally, various devices and hand tools have been used to perform cutbacks, but cutback devices are large and expensive, and they do not allow clad materials to be placed in containers, etc. It is difficult to apply this method to cutbacks after they have been assembled.

On the other hand, cutting back using various hand tools has the problem that the work time is long and the finished product is difficult to achieve.

[Means for Solving the Problems] In the present invention, the surface layer of the clad material is ablated using a laser beam.

[Function] According to the method of the present invention using a laser beam, cutback can be carried out extremely quickly, and the assembled cladding material can also be easily cutback.
Furthermore, the surface condition after cutback is flat and the finish is good.

[Example] Examples will be described below with reference to the drawings.

FIGS. 1 and 2 are diagrams illustrating an example of the method of the present invention, in which the edges of the cladding material 6 are irradiated with laser beams 13 and 14 from two directions to cut off the edges of the cladding material 1. do. That is, the laser beam 13 is irradiated from the surface side of the laminated material 1, and the laser beam 14
The beam is irradiated onto the mating surfaces of the mating material 1 and base material 2. Note that the beam intensity and light source movement speed of the laser beam 13 are adjusted so that it passes through only the laminated material 1. Further, the laser beam 14 adjusts its beam intensity and light source movement speed so that the laser beam 14 cuts a depth equal to the width W to be peeled off. Note that it is also possible to adjust the penetration depth of the beams by tilting the beams 13 and 14.

If such laser beams 13 and 14 are used, the surface after cutback will be flat, as shown in FIG. 2, and the finish will be extremely good. Also, the cutback operation is extremely easy. The shape of the edge to be cut back may be a straight edge as shown in FIG. 4, or a curved edge as shown in FIG.

There are no particular restrictions on the clad material to which the method of the present invention is applied, and it is clear that the method can be applied to various clad materials.

Further, as the laser beam, a laser beam generated from various laser light sources such as a carbon dioxide laser and a solid-state laser can be used.

[Effects] As is clear from the above description, the present invention performs cutback using a laser beam, and can perform cutback quickly with simple operations without using a large cutback device.
Also, the finish is extremely good. Since the cutback can be performed simply by irradiating the laser beam, the assembled cladding material can also be cutback by moving the laser light source along the cutback location.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the cutback method of the present invention, Figure 3 is a sectional view showing an example of the welding method for clad materials, and Figures 4 to 9 are illustrations of the conventional cutback method. It is a diagram. 1... Lamination material, 2... Base material, 13, 14... Laser beam.

Claims (1)

[Claims] 1. A method for cutting back a surface layer of a cladding material, the method comprising cutting off the removed portion with a laser beam.