JPS61169183A - Production of composite metallic member - Google Patents

Abstract

PURPOSE:To simplify a joining stage and to reduce cost by irradiating an energy beam having specific density on superposed metallic members at the prescribed quantity of heat input. CONSTITUTION:The metallic members 1 and 2 having different properties are superposed and the energy beam forcused to >=10<5> W/cm<2> is irradiated on the members from above the member 1. A molten metal 3 having the depth of penetration at which said metal enters the member 2 through the member 1 is formed by such irradiation, by which the members 1 and 2 are joined. The quantity of heat input per unit penetration depth is controlled to <=300J/cm/mm in this stage. The upper layer part 4 of the molten metal 3 has the same properties as the properties of the member 1 and the lower layer part 5 has the same properties as the properties of the member 2 when the members are welded by the above-mentioned method. The joining of the composite metallic member satisfying various characteristics is simplified and the cost is reduce by selecting suitably the member 1 and the member 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a composite member made of a plurality of metals having different characteristics, and in particular, a method for easily manufacturing a composite metal member of various types and for various purposes. This provides a new way to

[Conventional technology]

A wide variety of properties are required of metal structures, such as mechanical strength, corrosion resistance, wear resistance, and economic efficiency. However, it is difficult to simultaneously satisfy these various properties with a single metal material.

Therefore, in the past, metals with different characteristics were partially connected to suit the main purpose of use, or dissimilar metals were overlaid on the base metal (for example, JP-A-53-1
．． 00149), and a method using a so-called clad metal material, which is produced by simultaneously rolling two types of metals with different characteristics (for example, Japanese Patent Laid-Open No. 55-68195).

However, all of these methods have the common drawback that they complicate the manufacturing process of the structure, and the materials used are expensive, resulting in an expensive overall structure. had.

[Problem that the invention seeks to solve]

The present invention not only simplifies the manufacturing process of structures by providing a new method for easily placing metal having the necessary properties in the required locations of a structure, but also enables the metal to be produced in a fixed amount using conventional expensive manufacturing methods. The object of the present invention is to provide a method for manufacturing a composite metal member that can manufacture composite metal members in arbitrary quantities and at low cost, which previously could only be manufactured in units.

[Means for solving problems]

The gist of the present invention is to superimpose a plurality of metal members having different properties, and to apply power of 1.05 W/c from the surface! A method for manufacturing a composite metal member, characterized in that the overlapping metal members are fused and joined by irradiating an energy beam focused at an energy density of 300 J/cm/nvn or less per 111th penetration depth.

The inventor of the present invention has discovered that when multiple metal plates are superimposed and fused together using an energy beam, by reducing the amount of heat input per unit immersion depth to a predetermined value or less, the metal in the upper and lower layers of the molten part is extremely separated. It was found that there was little mixing.

In addition, Figure 1 is a diagram showing the relationship between energy density and heat amount per unit penetration depth.
It was confirmed that this is possible by using a focused energy beam.

Also, currently the energy density is 10' W/c+1! There are electron beams, laser beams, and plasma beams as heat sources that can be focused and used industrially, and industrialization is possible by using these beams.

In other words, if multiple metal members are superimposed and fused together using a focused energy beam with an energy density of 0'W/r as a heat source, the heat input per unit immersion depth will be 300 J. / cm / mth or less, and as a result, the joint portion can be joined with only a very small amount of mixing of the components of the plurality of stacked metal members.

The present invention has been made based on the findings mentioned above, and will be explained in detail below with reference to the drawings.

FIG. 2 is a sectional view illustrating a melting section according to the present invention.

105W/ by overlapping metal members 1 and 2 with different properties
A focused energy beam is irradiated from above the metal member 1 to form a metal 3 (hereinafter referred to as molten metal) having a penetration depth that penetrates the metal member 1 and enters the metal member 2. At the very least, the metal members 1 and 2 are joined.

At this time, the heat input per unit soaking depth is 300 J/c.
m/m or less, the upper layer 4 of the molten metal has the properties of the metal member 1 placed in the upper layer, and the lower layer 5 has the properties of the metal member 2 placed in the lower layer.

Further, the metal components of the second layer portion 4 and the lower layer portion 5 are separated near the boundary 6 between the metal members 1 and 2. Therefore, molten metal 3
The two-layer part can be evaluated equally to the metal member 1 placed in the -L layer.

Now, in FIG. 2, when the metal member 2 is mainly used as a strength member and the metal member 1 is a member expected to have corrosion resistance, the double layer portion 4 of the molten metal 3 is made of the metal expected to have corrosion resistance. Since it has the same properties as member 1, it becomes a composite metal member that satisfies both strength and corrosion resistance.

Furthermore, depending on the composition of the metal members 1 and 2, metal powder or metal foil that improves the bondability of the metal members 1 and 2 may be inserted in advance into the boundary 6 and melted and bonded at the same time.

On the other hand, even with focused energy beams such as electron beams, laser beams, and plasma beams, there is a limit where stable penetration cannot be ensured due to insufficient heat input if the unit immersion depth is less than 90 J/cm/m+n. According to this method, a structure is created by welding or bending metal members used as strength members, and then the structure is constructed by covering only the necessary parts with corrosion-resistant, wear-resistant, or aesthetically pleasing metal members. This makes it possible to greatly improve the simplification and reliability of the structure manufacturing process.

In addition, this composite metal member manufacturing method makes it possible to easily manufacture a wide variety of products in small quantities in the required quantity each time, so the cost of structures using composite metal members can be reduced.

The present invention will be explained below with reference to Examples.

[Example 1] FIG. 3 shows a structure in which a corrosion-resistant member 10 is composited on a welded structure in which strength members 7 and 8 are assembled in advance via a welded metal 9. The corrosion-resistant members were composited under the following fusion bonding conditions.

Strength member: 5M50. Plate thickness 12.5nwn corrosion-resistant member: 505304 (Ni = 8%, Cr = 18%)
.

Plate thickness: 3.0m Energy beam irradiation conditions: C○2 laser, 5KW Energy density: 1.4 x 1G' W/cJ Processing speed: 4m Irradiation locus grid pattern (11 in Figure 3) Penetration depth: 4 .5+1111 Heat input per meter of penetration depth 167.1/cm/wn As a result, the molten metal in the surface layer of the #1 resistant member has the same Nj, Cr content as the corrosion resistant member Even at a position close to the 5M50 material that entered the corrosion-resistant member from 1 to 1, the composition of the molten metal is Nj = 7.3%, Cr = 16.8%,
We were able to manufacture a composite metal member that satisfies both strength and surface corrosion resistance.

[Example 2] FIG. 4 shows a state in which a composite metal plate 12 in which a strength member 8 and a corrosion-resistant member 10 are combined is manufactured.

The strength member 8 and the corrosion-resistant member 10 are indicated by arrows 13 and 1, respectively.
The laser beam is supplied from direction 4, brought into close contact with pressure rollers 15 and 16, and sent to the laser beam irradiation position. The laser beam 17 was focused on the corrosion-resistant member 10'2, which is a surface layer member, and the optical system 18 was moved in the direction J\ of the arrow 19 to reciprocate at a turning angle of 20 in the board width direction. Melt joining of the corrosion-resistant members was performed under the following conditions.

Strength member: SUS'130 (Cr = 1.7.
7%).

Plate thickness 6. OIIMn, plate width 800nun corrosion resistant member: 5
LIS430 (Cr=17.7%).

Plate thickness], O+no+, plate width 800mm Energy beam irradiation conditions: CO2 laser 5Kw Energy beam density 1.2X106 (w/cJ) Beam movement speed 10m1 Analysis return angle 30° Irradiation trajectory: Polylinear composite metal plate manufacturing speed 2. 6m/min Penetration depth 1.9mm Heat input per penetration depth lllllT: ], 58J/
cm/mm As a result, the joint is in a solid state as it is fed 0.9 mm from the corrosion-resistant member 10, which is the surface layer member, into the strength member 8, and the molten metal in the surface layer is Cr which is almost the same as the base material.
=17.1% component. In addition, in this example, a composite metal plate with a width of 800 m and a length of 1800 ny+ was manufactured, and the strength member 8 and the corrosion-resistant member 1 used were
0 also have almost the same dimensions. In other words, only the required amount could be manufactured without waste.

Note that the trajectory of the laser beam irradiation does not necessarily have to be limited to a grid pattern or a folded line pattern, and may be selected depending on the purpose. That is, the interval between the irradiation lines can be easily expanded or shortened, and a specific pattern can be drawn on the irradiation locus to enhance the aesthetic effect.

Further, the metal members to be overlapped are not necessarily limited to a single plate, but the metal members 2+, 22 of small pieces shown in FIG.
, 23 and 24 may be appropriately arranged to form a composite, and it is also possible to manufacture a distinctive composite metal member by changing the components and characteristics of the metal members 21, 22, 23 and 24.

The direction of irradiation of the laser beam may be from either the front or the back of the stacked members.

-8~ Although not shown, the parts that become hot due to energy beam irradiation are gas shielded to prevent them from being directly exposed to the atmosphere.

Although the above embodiment uses a laser beam as the energy beam, similar effects can be obtained by using an electron beam or plasma beam focused at 10'' W/cd or more.

〔Effect of the invention〕

As described above, the present invention provides a method that simplifies the manufacturing process of structures using composite metal members and allows easy use of metal members with excellent properties, and has extremely large industrial value. .

[Brief explanation of drawings]

FIG. 1 is a graph showing the relationship between energy density and heat amount per unit penetration depth. FIG. 2 is a cross-sectional view illustrating a melting section according to the present invention. FIG. 3 is a perspective view showing the appearance of the composite metal member of Example 1. FIG. 4 is a perspective view illustrating a method for manufacturing a composite metal plate of Example 2. FIG. 5 is a perspective view showing a composite metal member in which small pieces of metal members are arranged. 1: Two-layer metal member 2: Lower metal member 3: Molten metal 4: Upper layer of molten metal 5: Lower layer of molten metal 6: Boundary surface of metal member 7; Strength member
8: Strength member 9: Weld metal 10: Corrosion resistant member 11: Laser beam irradiation trajectory 12: Composite metal plate 13, 14: Supply direction of metal member 15 and 16: Pressure roller 17: Laser beam 18
: Optical system I9: Moving direction of optical system 20: Turning angle of laser beam irradiation trajectory 21.22. and 23:
Small piece of metal member 24: Metal member 1 ■ 3 children 2 ■ l. 5 children 4 ■

Claims (1)

[Claims] A plurality of metal members with different properties are stacked one on top of the other, and an energy beam focused at an energy density of 10^5W/cm^2 or more is applied from the front and back to 30% per unit penetration depth.
A method for manufacturing a composite metal member, characterized by melting and joining stacked metal members by irradiating with 0 J/cm/mm or less.