JP2008055479A - Butt joining method for metal sheet, and joined metal sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a butt joining method for metal sheets where the sticking of spatters is prevented or suppressed, and further, a joined metal sheet having excellent formability can be produced, and to provide a joined metal sheet. <P>SOLUTION: The butt joining method for metal sheets comprises: a laser irradiation stage where the butted part at which metal sheets 1, 2 are butted each other is irradiated with a laser; and a wire feeding stage where wire is fed to the butted part at the laser irradiation stage. Then, as the wire 4 to be fed, using a copper based brazing filler metal, the metal sheets are joined each other by brazing. The copper based brazing filler metal has a chemical composition comprising, by mass, 1 to 10% Si, ≤35% Ni, ≤15% Al and ≤5% Mn, and the balance Cu with inevitable impurities. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal plate butt-joining method and a bonded metal plate.

For example, an electric resistance seam welding method, an arc welding method, and a laser welding method are used as a method of joining a plurality of metal plates to each other by welding or the like.
In the electric resistance seam welding method, current is applied while the ends of two metal plates are pressed by a pair of upper and lower disk-shaped electrodes, and heat is generated and melted by the specific resistance of the metal plates to weld the two metal plates together. It is a method to do.

As arc welding methods, TIG welding, plasma welding, and gas metal arc welding are known as widely used methods.
TIG welding is a method of welding by generating an arc between a tungsten electrode and a base material in an inert gas atmosphere such as argon. In plasma welding, an arc is generated by energizing between two electrodes in a welding torch, and a working gas mixed with argon and hydrogen is sent to the periphery of the electrode, so that the working gas is ionized by the heat of the arc. In this method, plasma is a gas body in which ions and electrons are mixed, and welding is performed with the heat of the plasma. These TIG welding and plasma welding are called non-consumable electrode type welding methods. In addition, gas metal arc welding generates an arc between the welding wire and the base metal while continuously supplying the welding wire in an atmosphere of inert gas such as argon or carbon dioxide gas and a mixed gas thereof. This is a method in which both are melted and welded, and is called a consumable electrode type welding method.

  On the other hand, the laser welding method uses a laser beam having a very strong condensing property as a concentrated heat source with an extremely high energy density, so that the welding depth is deep at the welded portion, and welding can be performed at high speed. it can. Therefore, according to this laser welding method, since the welding speed is high and the bead width is narrow, the welding speed is high and productivity can be improved as compared with the arc welding method and the electric resistance seam welding method described above. Moreover, since the bead width is narrow, there are advantages such as excellent press formability of the welded metal plate.

  That is, for example, in the above-described electrical resistance seam welding method, heat is generated and melted by the specific resistance of the metal plate to weld the two metal plates together, so that the thickness of the welded portion is thick and the width is widened. . Therefore, press formability is inferior compared with the laser welding method and the arc welding method. Furthermore, in the arc welding method described above, the heat source convergence is inferior compared to the laser welding method and the welding speed is slow. Therefore, when butt welding metal plates, the welding heat input becomes excessive and burn-through defects occur. It is easy and thermal deformation becomes large.

  Therefore, in recent years, a laser welding method has been widely adopted as a butt welding method for metal plates. Here, for example, a tailored blank is known as a metal plate in which a plurality of thin steel plates having different thicknesses and strengths are welded to each other as a metal plate. Tailored blanks are one of the leading technologies for weight reduction of automobile bodies, and this type of tailored blanks is mainly applied to the inner plates and reinforcing plates of automobile parts. The effect is great.

Fujinaga, Ohashi, Urakami, Katayama, Matsunawa; "Development of filler wire all-position butt welding technology using YAG laser", Journal of the Japan Welding Society, Vol. 22, No. 3, p369-374 (2004) Murayama, Gaien; "Development of all-position laser welding method for pipes", Laser Processing Society, Proc. Of the 63rd Laser Processing Society, p34-41 (2005. 5)

However, for example, the outer panel of an automobile part has a large area such as a side panel, and the weight per panel is heavy. There were no cases where tailored blanks were applied to the panels.
The following problems can be considered as reasons why tailored blanks are not applied to the outer panel.

  First of all, the laser welding method is superior in surface quality and press formability, such as welding thermal deformation being smaller than various arc and seam welding methods, but as a flip of the feature that laser beam condensing is high. It is necessary to strictly manage the butt gap (gap) of the weldment. The allowable amount of the butt gap is about 10% of the plate thickness of the workpiece, and if it exceeds this, the welded portion melts and the strength of the welded portion (welded joint) decreases. Therefore, in the conventional laser welding method, for example, in butt welding by laser single welding, the allowable amount of the gap is limited to a small range, and it is necessary to manage the butt gap as small as possible (for example, 0.05 mm or less). Therefore, for example, the butt surfaces must be cut with extremely high accuracy, and the butt surfaces cut with high accuracy must be butted accurately. However, there are cases where the gap exceeds the allowable limit due to bending or burring of the cut butt surface, and a welding technique with a large allowable limit of the butt gap has been desired.

  Further, when the carbon steel plates are butt welded, the laser welding method is reversed as high-speed welding, and in the welded portion, the molten metal is rapidly cooled and, so to speak, is in a quenched state. Therefore, the welded portion is hardened as compared with other portions. Thereby, the press formability in the welded portion is lowered. Therefore, it is still insufficient for producing a tailored blank that can be applied to an outer panel that requires high surface quality.

  Furthermore, the metal plate (steel plate) melted at the time of laser welding scatters and adheres to the surface of the metal plate close to the weld as spatter. Therefore, it is necessary to remove this spatter, but it is difficult to remove the sputter because it is firmly welded to the metal plate and is hard. Further, even if the spatter is removed, since the welded portion is harder than the other portions, the welded portion will be raised after press forming. Therefore, in this respect as well, there remains a problem to be solved in terms of quality.

Here, as a technique for relaxing the allowable amount of the butt gap, a technique is known in which a carbon steel-based wire is supplied to the butt portion and welded during laser irradiation (see, for example, Non-Patent Documents 1 and 2). However, even if the techniques described in Non-Patent Documents 1 and 2 are adopted, the wire supplied at the time of laser irradiation is a carbon steel-based wire. Since the adhesion of spatter, which is a problem on the surface quality described above, is unavoidable, there still remains a problem to be solved in order to produce a tailored blank that can be applied to, for example, an outer panel.
Therefore, the present invention has been made paying attention to such a problem, and prevents or suppresses the adhesion of spatter, and also a metal plate butt-joining method capable of producing a bonded metal plate excellent in formability and The object is to provide a bonded metal plate.

  In order to solve the above-mentioned problems, a first invention of the present invention is a method of joining a plurality of metal plates to each other, and irradiating a laser to a butt portion where the metal plates are abutted to each other. And a wire supplying step of supplying a wire to the butt portion during the laser irradiation step, and using the copper-based brazing material as the wire, the metal plates are joined to each other by brazing .

  According to the first invention, a plurality of metal plates are butted together and joined by brazing with a laser using a copper (Cu) -based brazing material. It can be suppressed by the brazing filler metal. Furthermore, since the copper-based brazing material has a lower melting point than steel and carbon steel-based wires, it is possible to suppress the output of the laser to be irradiated by the amount of the lower melting point. Therefore, it is possible to suppress the scattering of the metal plate that melts at the joint portion, thereby preventing or suppressing the adhesion of spatter to the surface of the metal plate. As a result, according to the butt-joining method of the metal plates according to the first invention, the formability can be improved and the adhesion of spatter can be prevented or suppressed. Thereby, the joining metal plate applicable to the use which was not able to be put into practical use by the prior art, for example, a joining steel plate for outer plate parts, can be manufactured.

  Here, in the butt joining method of the metal plates according to the first invention, the copper brazing material supplied as the wire has a chemical composition of Si: 1 to 10 mass%, Ni: 35 mass% or less, Al: 15 mass%. Hereinafter, it is preferable that Mn: 5 mass% or less, remaining Cu and unavoidable impurities. With such a configuration, the copper-based brazing material (Cu-based wire) has a melting point of about 1000 ° C., which can be significantly lower than the melting point of, for example, about 1500 ° C. of carbon steel-based wire. . Therefore, it is possible to suppress the output of the laser to irradiate only by the low melting point, and it is possible to join by brazing without melting the base material, and thus prevent or suppress the scattering of the steel sheet melted at the joint. Preferred above. Moreover, this copper-based brazing material having the above chemical composition also has the advantage that no significant decrease in the press formability of the bonded metal plate is observed compared to the welded metal plate by laser single welding. Yes.

Moreover, in the butt-joining method of the metal plate which concerns on 1st invention, it is preferable to apply to the thin steel plate whose thickness is 0.4 mm or more and less than 4.5 mm as said several metal plate. Such a configuration is suitable as a metal plate to be applied to a butt-joining method of metal plates having no spatter adhesion and excellent formability.
Further, in the butt joining method of a metal plate according to the first aspect of the present invention, examples of a plurality of metal plates, galvanized have been made, the thin steel sheet of the galvanized amount is 0 g / m ^2, greater 120 g / m ² or less It is preferable to apply. Such a configuration is suitable as a metal plate to be applied to a butt-joining method of metal plates having no spatter adhesion and excellent formability.

Moreover, 2nd invention among this invention is a joining metal plate by which a some metal plate is faced | matched mutually and joined, Comprising: It manufactures by the butt joining method of the metal plate which concerns on 1st invention. It is characterized by that.
According to the second aspect of the present invention, the bonded metal plate is a bonded metal plate that is abutted with a laser using a copper-based wire after a plurality of metal plates are brought together. Therefore, the bonded metal plate has no spatter adhesion and is excellent in formability. .

  Here, it is preferable that the joining metal plate which concerns on 2nd invention is a tailored blank applied to the outer panel of an automotive component. That is, since the joining metal plate manufactured by the butt joining method of the metal plates according to the present invention has no spatter adhesion and excellent formability, it is particularly suitable as a tailored blank applied to an outer panel of an automobile part. Is preferred.

  As described above, according to the present invention, it is possible to provide a metal plate butt-joining method and a bonded metal plate capable of preventing or suppressing spatter adhesion and producing a bonded metal plate having excellent formability.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a metal plate butt-joining method and a bonded metal plate according to the invention will be described with reference to the drawings as appropriate.
First, an embodiment of a laser bonding apparatus according to the present invention will be described with reference to FIG. 1 as appropriate. FIG. 1 is an explanatory view showing a schematic configuration of the laser bonding apparatus.
As shown in the figure, the laser bonding apparatus 20 has a bracket 23, and the bracket 23 is equipped with a laser irradiation apparatus 21 and a wire supply nozzle 24.

In the laser irradiation device 21, a laser beam output from a laser oscillator (not shown) is introduced via an optical fiber cable or an optical system, and the laser beam L is a plurality of (two in this example) metal members to be joined. The light is condensed on the abutting portions on the plates 1 and 2 and can be irradiated.
Further, the wire supply nozzle 24 is fixed to the bracket 23 so as to be directed in the direction of the butting portion that becomes the joint portion 3, and is further connected to the wire supply device 22 via the conduit tube 25. The wire supply device 22 includes a wire reel 26. A filler wire (hereinafter simply referred to as “wire”) 4 is wound around the wire reel 26, and a motor (not shown) is driven to feed the wire 4 from the wire reel 26 to the wire supply nozzle 24. The wire 4 can be continuously supplied.

  The laser bonding apparatus 20 moves the wire supply apparatus 22 in the bonding operation while moving the head 21a of the laser irradiation apparatus 21 along the bonding direction with respect to the two fixed metal plates 1 and 2. By synchronizing and continuously supplying the wire 4 to the abutting portion between the metal plates 1 and 2 at a predetermined speed, the metal plates 1 and 2 can be joined together by brazing, and the joining portion 3 can be formed at the abutting portion. ing.

Here, the metal plate butt-joining method of the present embodiment uses the above-described laser bonding apparatus 20 to join the two metal plates 1 and 2 together as shown in FIGS. Then, it is used for manufacturing the bonded metal plate 10. And especially this joining metal plate 10 is a thing suitable for the tailored blank applied to the outer panel of an automotive component.
Examples of the material of the metal plates 1 and 2 applicable to this butt joining method include carbon steel, aluminum, aluminum alloy, magnesium, magnesium alloy and the like. Moreover, in this embodiment, it is the example applied to the thin steel plate whose thickness is 0.4 mm or more and less than 4.5 mm as the metal plates 1 and 2. The plurality of metal plates 1 and 2 to be butt bonded may have the same or different thickness. In addition, these metal plates 1 and 2 are galvanized, and an example in which a thin steel plate having a galvanizing amount exceeding 0 g / m ² and not more than 120 g / m ² is used.

  This butt joining method is a joining method including a laser irradiation step and a wire supply step. Further, as shown in FIG. 2, the butt joint 5 having a gap S between the metal plates 1 and 2 butt each other. It is joining. Then, by supplying a copper-based brazing material (Cu-based wire) to the abutting portion 5 and joining them by brazing without melting the metal plates 1 and 2 as the base materials, the various welding methods described above Compared to the above, it is possible to form the joint 3 having no defects such as burn-off. This butt joining method is the same as the conventional laser welding method described above except for the points described below. Therefore, different points will be mainly described, and descriptions of other points will be omitted. .

  Specifically, in this butt joining method, a laser irradiation step of irradiating a laser L to the butt portion 5 where two metal plates 1 and 2 are abutted with each other by the laser irradiation device 21, and at the time of this laser irradiation step And a wire supplying step of supplying the wire 4 to the butting portion 5 at the same time as irradiating the laser L from the wire supplying device 22 through the wire supplying nozzle 24 or the like. In addition, as a laser irradiated in this laser irradiation process, for example, any laser that can be used for thermal processing, such as a CO2 laser, a CO laser, a slab laser, an Nd-YAG laser, a glass laser, an excimer laser, a fiber laser, and a semiconductor laser The method is applicable.

In this butt joining method, a copper-based brazing material (Cu-based wire) is used as the wire 4 supplied in the wire supplying step. This copper-based brazing filler metal has a chemical composition of Si: 2 to 10 mass%, Ni: 35 mass% or less, Al: 15 mass% or less, Mn: 5 mass% or less, the remainder Cu and inevitable impurities.
Here, Si is an element that increases the strength of Cu and increases the melting point. For this reason, if the addition amount of Si shall be 1 mass% or more, it is preferable. Moreover, it is more preferable if the addition amount of Si shall be 2 mass% or more. However, if the amount of Si added is too high, it becomes brittle, so it is preferable to set 10 mass% or less. Therefore, this copper-based brazing material has Si of 2 to 10 mass% in its chemical composition. Ni and Al are both elements that significantly increase the strength. For this reason, when 35 mass% Ni or 15 mass% Al is added alone, the tensile strength exceeds 540 MPa. However, since it will become brittle if it adds more than this, it is preferable to make Ni and Al upper limit said addition amount. Therefore, this copper-based brazing filler metal has Ni of 35 mass% or less and Al of 15 mass% or less in the chemical composition. Further, Mn is an element that increases the strength of Cu and also increases the melting point. For this reason, it is preferable that the addition amount of Mn shall be 0.5 mass% or more. However, if the amount of Mn added is too high, it becomes brittle, so it is preferable to set 5.0 mass% or less. Therefore, this copper-based brazing material has Mn of 0.5 to 5.0 mass% or less in its chemical composition. Furthermore, the remainder of this copper-based brazing material is substantially composed of copper (Cu) and unavoidable impurities, but may contain trace elements other than unavoidable impurities as long as the effects of the present invention are not hindered.

This copper-based brazing material having the above-mentioned chemical composition also has an advantage that no significant decrease in the press formability of the bonded metal plate is recognized as compared with laser single welding (Examples described later). 1).
In addition, the Cu-based wire (copper-based brazing material) having the above-described chemical composition has a melting point of about 1000 ° C., which can be significantly lower than the melting point of, for example, about 1500 ° C. of carbon steel wire. . Therefore, it is possible to suppress the output of the laser to irradiate only the low melting point to an output capable of melting the Cu-based wire without melting the metal plates 1 and 2 as the base material, thereby melting the base material. Therefore, it is possible to prevent or suppress the scattering of the metal plates 1 and 2 that melt at the joint portion 3, and to prevent or suppress the adhesion of spatter to the surfaces of the metal plates 1 and 2. (Refer to Example 2 described later).

Next, the butt-joining method of the metal plate and the operation / effect of the bonded metal plate will be described.
As described above, according to the butt joining method of the metal plates, the two metal plates 1 and 2 are abutted with each other, and the abutting portions 5 are brazed with a laser using a copper (Cu) brazing material. Therefore, the hardness of the formed joint 3 can be suppressed by the hardness of the copper-based brazing material.
That is, as described above, the Cu-based wire supplied to the butt portion 5 during the laser irradiation process has a melting point of about 1000 ° C., which is significantly lower than the melting point of the carbon steel-based wire, 1500 ° C. Therefore, it is possible to suppress the output of the laser to be irradiated by the low melting point. Therefore, since it can join by brazing, without fuse | melting a base material, it can prevent or suppress the scattering of the metal plates 1 and 2 which fuse | melt at the junction part 3, Thereby, the metal plates 1 and 2 surface It is possible to prevent or suppress the adhesion of sputtering to the surface.

  Further, this copper-based brazing material having the above chemical composition also has an advantage that no significant decrease in the press formability of the bonded metal plate 10 is observed as compared with laser single welding. As a result, it is possible to improve the formability, and as a result, it is possible to improve the formability of the bonded steel sheet for outer plate parts, such as tailored blanks that can be applied to the outer panel described above. The joining metal plate applicable as can be manufactured.

  And since the joining metal plate 10 manufactured by this metal plate butt joining method is joined by brazing with a laser using a Cu-based wire having the above chemical composition, there is no adhesion of spatter to the surface. It has excellent moldability. Therefore, it is suitable as a tailored blank applicable to uses such as bonded steel sheets for outer plate parts that could not be put into practical use by the prior art, for example, outer panel panels for automobile parts described above.

As described above, according to the butt joining method of the metal plates, the two metal plates 1 and 2 are butt-joined and joined with a laser using a copper-based wire, so that there is no spatter adhesion and excellent formability. The metal plate 10 can be manufactured. And the joining metal plate 10 manufactured by this has the useful effect that there is no adhesion of spatter and it is excellent in formability.
Note that the metal plate butt joining method and the joining metal plate according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above embodiment, the copper brazing material supplied as a wire has a chemical composition of Si: 2 to 10 mass%, Ni: 35 mass% or less, Al: 15 mass% or less, Mn: 5 mass% or less, the remaining Cu and Although an example using an inevitable impurity (hereinafter, copper-based brazing material having the same chemical composition is also referred to as “copper-based brazing material according to the present invention”) has been described, the present invention is not limited to this, and the present invention The metal plate butt-joining method includes a laser irradiation step of irradiating a laser to a butt portion where the metal plates are butted together, and a wire supply step of supplying a wire to the butt portion during the laser irradiation step. Various copper-based brazing materials can be applied to the supplied wire as long as the metal plates are joined to each other using a copper-based brazing material as a wire to be supplied in the supplying process. However, by using a copper-based brazing material having an advantage that its melting point is about 1000 ° C. and there is no significant decrease in the press formability of the weld-bonded metal plate compared to laser single welding. In order to prevent or suppress adhesion and to more suitably manufacture a bonded metal plate having excellent formability, it is preferable to use the copper brazing material according to the present invention.

  Further, for example, in the above embodiment, the metal plate butt joining method according to the present invention is applied to a thin steel plate having a thickness of 0.4 mm or more and less than 4.5 mm as a metal plate, and these are butted together. The example of joining by brazing without melting the base material has been described, but the thickness range of the applicable metal plate is not particularly limited as long as butt joining is possible. However, in applying the metal plate butt-joining method according to the present invention, the preferred metal plate thickness range depends on the joining conditions such as heat input of brazing, brazing speed, etc. It is preferable if the thickness ranges from 0.4 mm to 4.5 mm.

In the above embodiment, the butt joint method of a metal plate according to the present invention, as a metal plate, galvanized have been made, the thin steel sheet of the galvanized amount is 0 g / m ^2, greater 120 g / m ² or less This is applied to the example of joining and joining each other. However, the present invention is not limited to this, and the presence or absence of plating, or the amount of plating when plating is applied, should be within the range where butt joining is possible. If it does not specifically limit. However, when applying the metal plate butt-joining method according to the present invention, as a suitable metal plate, the target metal plate has zinc plating, and the amount of zinc plating is 0 to 120 g / m ² . A range is preferred.

Next, examples will be described.
[Example 1]
First, Example 1 will be described.
In the first embodiment, as the metal plates 1 and 2 that are joining members that are brought into contact with each other and joined (welded), as shown in FIG. 3, a joined metal in which two thin steel plates are brought into contact with each other and joined (welded) The plates were respectively produced by a butt joining method according to the present invention (hereinafter referred to as “application example”) and a conventional laser welding method (hereinafter referred to as “comparative example”).

A YAG laser was used as a laser for irradiating the butting portions 5 of the metal plates 1 and 2. And as a wire (welding wire) supplied to this butt | matching part 5, the copper-type wire which concerns on the said this invention was used in the application example. On the other hand, in the comparative example, a carbon steel welding wire was used. And various joining metal plates were created by changing the joining (welding) speed and the wire (welding wire). Thereafter, a ball head overhang test and a hole expansion test were performed on each bonded metal plate, and the formability of the bonded (welded) portion 3 was investigated. In addition, the metal plates 1 and 2 used for this joining (welding) are 340 MPa class cold-rolled steel plates having thicknesses of 0.8, 1.6, and 2.4 mm in both application examples and comparative examples.
Table 1 shows the joining (welding) conditions, and Table 2 shows the wire composition. In addition, FIG. 3 and Table 3 show the ball head protruding test pieces and the test conditions. In addition, FIG. 4 and Table 4 show the hole expansion test pieces and the test conditions. Further, the test results are shown in Table 5.

  As can be seen from Table 5, in the application example, the hardness of the joining portion 3 of the joining metal plate 10 using the copper-based wire (in the table, “copper alloys 1 to 4”) which is the copper-based brazing material according to the present invention. It was Hv100-157. On the other hand, in the comparative example, the hardness of the welded part of the welded metal plate using a carbon steel welding wire (“carbon steel” in the table) was Hv 285 to 350. Furthermore, in the ball head overhang test, the overhang height of the joint metal plate 10 of the application example is 18 mm at the lowest, and most of the overhang height is 20 mm or more. The overhang height is the highest, 18 mm, and both are on the order of 10 mm. Further, in the hole expansion test, the hole expansion rate in the joining metal plate 10 of the application example is 53% or more, while the hole expansion rate in the welding joint metal plate of the comparative example is 23 for all. % Or less.

  Thereby, it was confirmed that the hardness of the junction part 3 of an application example is remarkably low compared with the hardness of the welding part of a comparative example. Therefore, according to the metal plate butt-joining method according to the present invention, it is possible to manufacture a bonded metal plate having excellent formability, and the bonded metal plate 10 manufactured thereby has excellent formability. It was confirmed that

[Example 2]
Next, Example 2 will be described.
In this Example 2, various joining metal plates prepared in the same manner as in the “application example” and “comparative example” in Example 1 above were prepared, and the number of spatters adhering to the vicinity of the joint (welded part) was determined. investigated. The test results are shown in Table 6 below. In this table, when evaluating the surface quality, the case where the number of spatters adhering per weld line length of 10 cm at the joint (welded part) is 5 or less is determined as “good” and 5 The above case was determined as “bad”.

  As can be seen from Table 6, in the comparative example, the welded part of the welded metal plate using the carbon steel welding wire has a surface product evaluation result of “x”, and a large amount of spatter is adhered. The surface quality was confirmed to be poor. On the other hand, in the application example, the bonding part 3 of the bonding metal plate 10 using the copper-based wire that is the copper-based brazing material according to the present invention has a surface product evaluation result of “◯”, and is sputtered. It can be seen that the quality is good with little adhesion. Thereby, according to the butt-joining method of the metal plate which concerns on the said invention, the joining metal plate which prevented or suppressed adhesion of spatter can be manufactured, and according to the joining metal plate 10 manufactured by this, It was confirmed that spatter adhesion was prevented or suppressed and the surface quality was excellent.

It is explanatory drawing which shows schematic structure of one Embodiment of the laser joining apparatus which concerns on this invention. It is a figure explaining one embodiment of the butt joining method of a metal plate concerning the present invention, and a joined metal plate. It is a figure explaining the example of the butt joining method of the metal plate which concerns on this invention, and a joining metal plate. It is a figure explaining the example of the butt joining method of the metal plate which concerns on this invention, and a joining metal plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (One side to butt) Metal plate 2 (The other side to butt) 3 Metal plate 3 Joining part 4 Filler wire (wire)
DESCRIPTION OF SYMBOLS 5 Butting part 10 Joining metal plate 20 Laser joining apparatus 21 Laser irradiation apparatus 22 Wire supply apparatus 23 Bracket 24 Wire supply nozzle 25 Conduit tube 26 Wire reel

Claims (6)

A method of joining a plurality of metal plates to each other,
A laser irradiation step of irradiating a laser to the butting portion where the metal plates are butted together, and a wire supply step of supplying a wire to the butting portion during the laser irradiation step,
A method for butt-joining metal plates, characterized in that a copper-based brazing material is used as the wire to join the metal plates together by brazing.   The copper-based brazing material supplied as the wire has a chemical composition of Si: 1 to 10 mass%, Ni: 35 mass% or less, Al: 15 mass% or less, Mn: 0.5 to 5 mass%, remaining Cu and inevitable impurities. The metal plate butt-joining method according to claim 1, wherein:   The metal plate butt-joining method according to claim 1, wherein the metal plates are applied to a thin steel plate having a thickness of 0.4 mm or more and less than 4.5 mm. As described in any one of 1 to 3, wherein the plurality of metal plates are galvanized and applied to a thin steel plate having a galvanizing amount exceeding 0 g / m ² and not exceeding 120 g / m ^2. The metal plate butt joining method described. A joined metal plate formed by joining a plurality of metal plates to each other,
A bonded metal plate manufactured by the method for butt-bonding metal plates according to any one of claims 1 to 4.   The bonded metal plate according to claim 5, wherein the bonded metal plate is a tailored blank applied to an outer plate panel of an automobile part.

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