JP2009039720A - Method and device for joining different metals - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for joining different metals by which both of the security of corrosion resistance with a sealing material and prevention of degradation of the strength of a joint due to the remainder of the sealing material can be achieved without bringing about the increases of the weight of the joint and of the cost caused by new equipment investment, and also to provide a joining device used for such a method. <P>SOLUTION: When performing the lap joining of both materials by irradiating the different kinds of metallic materials 10, 20 which are overlapped in a state that a sealing material S composed of a thermosetting resin is applied in the position near a joining part W with a high-energy beam Bw, after hardening the sealing material or lowering its flowability by heating at least an end part on the side of joining part of the applied sealing material S with a diode laser beam, for example, both materials 10, 20 are joined by irradiating the joining part W with the high-energy beam Bw. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joining method by irradiation of a high energy beam such as an electron beam or a laser beam of dissimilar metals such as a steel material and an aluminum alloy material, and a dissimilar metal joining apparatus that can be suitably used for such a method. Is.

  In recent years, for the purpose of reducing the weight of automobile bodies and the like, in addition to steel materials that have been widely used in the past, body members made of light metals such as aluminum alloys (for example, roof panels made of aluminum alloys) Application is progressing.

It is known that when dissimilar metals are used in combination at the bonding sites in these members, the dissimilar metals come into contact with each other and are electrically connected, thereby promoting corrosion.
Corrosion due to contact between different metals is caused by a potential difference between the metals due to the difference in the ionization tendency of the metal, and a corrosion current flows. The following measures are adopted.

  For example, Patent Document 1 discloses a first member made of steel and a second member made of aluminum or an alloy thereof, with a sealing material interposed between the two members, such as a rivet or a reinforcing member. There has been proposed a joining structure for vehicle body members that is joined by joining means.

Patent Document 2 proposes to immerse a member in which an iron-based material and aluminum or an aluminum alloy material are joined in a solution containing fluoro complex ions and zinc ions. By immersion in the solution, metal zinc having a dense, strong, high adhesion and intermediate ionization tendency between aluminum and iron is deposited in the vicinity of the joint part of the member, and thereby different metal contact corrosion resistance at the joint part. It is said that can be improved.
JP 2000-272541 A JP 2005-154844 A

  However, in the technique described in Patent Document 1, since the melting point and the linear expansion coefficient of both materials are different, mechanical fastening such as rivets and bolts is employed without performing welding, and components used for joining There is a problem that the weight and cost of the vehicle body member increase due to the increase in the number of points.

  In the technique described in Patent Document 2, the joined member is immersed in a solution containing a fluoro complex ion and a zinc ion. Incorporating the step of dipping requires new equipment investment such as a dipping tank, which increases the cost. In addition, it is difficult to sufficiently satisfy the corrosion resistance required for automobile parts only with zinc deposited on the surface of the bonding material.

As described above, in the joining of dissimilar metal materials, it is essential to take measures against electrolytic corrosion to prevent corrosion due to contact with dissimilar metals. Therefore, a method of joining with a sealing material between the joining interfaces has been considered.
At this time, in the case of a welding method that can pressurize the welded portion directly like resistance spot welding, the sealing material sandwiched between the joint interfaces can be discharged from the joint interface by pressurization.

However, in the case of joining by irradiation with a high energy beam, such as laser welding, it is structurally difficult to directly pressurize the position where the high energy beam is irradiated by a pressing means.
Therefore, since a method is adopted in which a material is heated immediately after being irradiated with a high energy beam and pressed with a pressure roller or the like, the sealing material tends to remain at the bonding interface with this method, and the bonding strength is high. There was a problem of a significant drop.

In addition, when the high energy beam is irradiated, a pressure roller for removing the sealing material from the joint portion is preceded.
However, as shown in FIG. 14, the thermosetting resin used as the sealing material has its deformation resistance (viscosity) once lowered due to the temperature rise. Therefore, when the thermosetting resin is heated to this temperature by high energy beam irradiation, the viscosity becomes low. Since the lowered sealing material flows into the joint portion again, it is difficult to prevent the sealing material from remaining.

Furthermore, there is also a method in which welding is performed after applying a sealing material to a nearby position away from the joint, avoiding the joint.
However, even in this case, when the high energy beam is irradiated to the joint, the seal material is heated by heat transfer from the joint, and similarly, the seal material having a reduced viscosity enters the joint at the high temperature. There is a problem that the bead is disturbed or the sealing material remains. In addition, there is a problem in that a lot of porosity is generated in the applied sealing material and the sealing function is deteriorated.

  The present invention has been made in view of the above problems in conventional dissimilar metal bonding using a high energy beam. And the purpose is to achieve both the securing of corrosion resistance by the sealing material and the prevention of a decrease in the joint strength due to the remaining sealing material without increasing the weight of the joint or increasing the cost due to new capital investment. Another object of the present invention is to provide a bonding method for dissimilar metals. Moreover, it is providing the joining apparatus used for such a method.

  As a result of intensive studies to achieve the above object, the present inventors applied a sealing material in the vicinity of the joint, avoiding the joint, and prior to irradiation with a high energy beam for joining, The present inventors have found that the above problems can be solved by heating the sealing material to cure the sealing material or at least reduce its fluidity, and have completed the present invention.

  In other words, the present invention is based on such knowledge, and in the dissimilar metal bonding method of the present invention, the dissimilar materials overlapped in a state where a sealing material made of a thermosetting resin is applied in the vicinity of the bonding portion. When a metal material is irradiated with a high energy beam and the two materials are overlapped and joined, the fluidity of the sealing material is lowered by heating at least the end of the applied sealing material on the joining portion side, and then the high energy beam. It is characterized in that the joint portion is joined by irradiation of.

  Further, the dissimilar metal joining apparatus of the present invention can be suitably used in the dissimilar metal joining method of the present invention, and is superposed in a state where a sealing material made of a thermosetting resin is applied in the vicinity of the joint. A high energy beam irradiation head for irradiating a high energy beam to a joint part of different metal materials, and a heating means attached to the high energy beam irradiation head for heating at least the joint side end of the sealing material The heating means is configured to move relative to the dissimilar metal material integrally with the high energy beam irradiation head.

  According to the present invention, prior to joining by irradiation with a high energy beam, after the sealing material applied in the vicinity of the joint is heated, the fluidity of the sealing material made of a thermosetting resin is reduced, A high energy beam is irradiated to the joint portion to join dissimilar metal materials. That is, once the curing material has been cured and the fluidity has been lowered, the sealing material does not soften any more even if it is heated again. Such a thing disappears. Therefore, it can join in the state where there is no sealing material at the joint interface, and stable joining is possible, and it is possible to achieve both high joining strength and ensuring corrosion resistance by the sealing material.

  Below, the joining method and joining structure of the dissimilar metals of this invention are demonstrated concretely and in detail based on drawing.

  FIGS. 1A to 1D show an example of a laser welding apparatus used in the present invention, that is, an apparatus for joining dissimilar metals of the present invention. The laser welding apparatus shown in FIG. It is mainly composed of a laser irradiation head 50 as an energy beam irradiation head, a pressure roller 51, and a diode laser irradiation head 52 as a heating means. The laser irradiation head 50, the pressure roller 51, and the diode laser irradiation head 52 are connected to each other and move integrally in the left direction in the figure.

  The laser irradiation head 50 is connected to a laser oscillator (not shown). And, as will be described later, in the joint portion of dissimilar metal materials (for example, the aluminum alloy plate 10 and the steel plate 20) superimposed in a state where the sealing material S made of a thermosetting resin is applied to the vicinity position away from the joint portion, The laser beam Bw in a defocused state is irradiated from the upper side in the drawing, that is, the oblique front side of the steel plate 20 that is the high melting point side material (see FIG. 1C, which is a front view from the front side in the traveling direction at the laser irradiation position). ) Is arranged as follows.

  On the other hand, the roller 51 pressurizes immediately after the laser irradiation position by the laser irradiation head 50 to join both materials (see FIG. 1D showing a front view at the pressing position).

  Further, the diode laser irradiation head 52 is disposed further forward of the laser irradiation head 50 and the pressure roller 51 (see FIG. 1B, which is a front view at the laser irradiation position). Prior to joining, at least the joining portion side end of the sealing material S applied in the vicinity of the joining portion is heated by irradiating the diode laser beam Bd to cure the sealing material S or at least improve its fluidity. The sealing material S is prevented from flowing into the joint portion.

  In the welding apparatus, by continuously moving and irradiating the laser, both materials can be joined in a continuous linear shape, and stitching or spot-like multipoints can be made by intermittently irradiating the laser. Can be joined.

In the above description, the diode laser irradiation head 52 is employed as a heating means for heating the sealing material S to reduce or cure its fluidity, and the diode laser beam Bd is irradiated. The heating means is not limited to laser irradiation. For example, it is possible to employ a blower heating with high-temperature air, a heating with a gas combustion flame, a high-frequency overheating device, a seam welding device, a hot roller with a built-in heater, or the like.
In the present invention, there is no particular limitation on the combination of dissimilar metal materials to be joined, and both materials are joined by irradiating a high energy beam such as a laser from the high melting point material side and transferring heat from the high melting point material. However, the description will be continued below taking the combination of the aluminum alloy plate and the steel plate as an example.

FIG. 2 shows a first embodiment of the dissimilar metal joining method of the present invention.
First, when the steel plate 20 is stacked on the aluminum alloy plate 10, the thermosetting sealing material S is applied to the joint W at the seal material application position C, which is a position near the joint W of the aluminum alloy plate 10. Then, the steel plate 20 is stacked thereon.

Then, irradiation is performed while moving the diode laser beam Bd from the side of the steel plate 20 to the position immediately above the end portion closest to the joint W of the sealing material S by the diode laser irradiation head 52 serving as a heating means. Subsequently, the defocused laser beam Bw is moved along the bonding line to irradiate the bonding portion W to heat the steel plate 20, and immediately after the laser irradiation position by the roller 51, the steel plate 20 is heated. Is pressed against the aluminum alloy plate 10. Thereby, the joining interface of the joining part W of the steel plate 20 and the aluminum alloy plate 10 is heated by the heat transfer from the steel plate 20 heated by the laser beam Bw, and is maintained at a predetermined temperature. Therefore, the steel plate 20 and the aluminum alloy plate 10 are joined at the joint W.

  And after joining both the materials 10 and 20 by irradiation of the laser beam Bw, and the pressurization with the roller 51, the sealing material S is continuously apply | coated to the right end part in the figure of the steel plate 20 along an edge part. As a result, the overlapping portions of different metals are sealed from both sides by the sealing material S, and the water-tightness of the overlapping portions is maintained, so that it is possible to prevent electrolytic corrosion.

  Thus, the seal material S is hardened at the end closest to the joint W, and once cured, the seal material S does not soften even when heated again. Even if it irradiates Bw, the sealing material S does not soften by the heat transfer. Therefore, since the sealing material S does not flow into the joint W and the joining can be performed without the sealing material S at the joint interface, stable joining is possible, high joint strength and excellent corrosion resistance due to the sealing material. Will be obtained.

FIG. 3 shows a second embodiment of the dissimilar metal bonding method according to the present invention.
In this embodiment, the aluminum alloy plate 10 that is a lower melting point material is prevented from flowing into the joint W of the seal material S at a position between the joint W and the application position C of the seal material. As a means to do this, the bank portion 11 that rises from the joint surface and has a convex shape is continuously provided along the joint line. On the other hand, a step 21 is continuously formed on the steel plate 20, which is a high melting point material, along the convex bank 11 provided on the aluminum alloy plate 10.

Next, after continuously applying the sealing material S along the bank 11 to the application position C of the sealing material of the aluminum alloy plate 10, the steel plate 20 is stacked on the aluminum alloy plate 10.
At this time, the sealing material S pressed in the thickness direction is crushed and spreads in the lateral direction, but the convex bank 11 prevents the sealing material S from spreading, and the sealing material S to the joint W Inflow can be prevented.

  In joining, irradiation is performed while moving the diode laser beam Bd from the side of the steel plate 20 to the position immediately above the joining portion W of the sealing material S blocked by the convex bank 11, thereby moving the diode laser beam Bd. The sealing material S is partially heated to be cured.

Then, the steel plate 20 is heated by irradiating the joining portion W while moving the laser beam Bw defocused from the steel plate 20 side along the joining line. Subsequently, immediately after the laser irradiation position, the roller 51 presses the steel plate 20 in a direction in which the steel plate 20 is pressed against the aluminum alloy plate 10.
The heat transfer from the steel plate 20 heated by the laser beam Bw heats the joint interface between the joint portion W of the steel plate 20 and the aluminum alloy plate 10 and keeps it at a predetermined pressure by the roller 51 while maintaining a predetermined temperature. Therefore, the steel plate 20 and the aluminum alloy plate 10 are joined at the joint W.

  Finally, after both materials 10 and 20 are joined by laser beam irradiation and pressure applied by the roller 51, the sealing material S is continuously applied to the right end of the steel plate 20 along the end. As a result, the overlapping portions of different metals are sealed from both sides by the sealing material S, and the water-tightness of the overlapping portions is maintained, so that it is possible to prevent electrolytic corrosion.

  According to such a method, when the two materials 10 and 20 are stacked, the bank portion 11 blocks the spread of the seal material S, so that the seal material S does not flow into the joint portion W, and the seal material S. The side closest to the joint W is hardened. Once the sealing material S is cured, it does not soften even when heated again. Therefore, the sealing material S does not soften even when irradiated with the high energy beam Bw during joining, and more reliably prevents the sealing material S from flowing into the joint W. can do. As a result, since it can join in the state where seal material S does not exist in a joined part interface, stable joining is possible and it can make high joint strength and corrosion resistance compatible.

The shape of the bank portion as an inflow blocking means for preventing the seal material S from flowing into the joint portion W is not limited to the convex shape as described above, and the same effect can be exhibited by other shapes. Can do.
For example, as shown in FIG. 4, it can be set as the bank part 12 of the shape which stands | starts up in a step shape from the sealing material application surface of the aluminum alloy plate 10, and it is not necessary to form a level | step difference in the steel plate 20 side at this time. Also in this case, similarly to the above-described second embodiment, the spread of the sealing material S in which the bank portion 12 is crushed is blocked to prevent the sealing material S from flowing into the joint portion W. be able to.

Further, as shown in FIGS. 5 and 6, the shape of the bank portion is a two-step rising on the application position C side, and a gap generated between the two materials when the mating bonding material is overlapped is joined. It is desirable to use the bank portion 13 having a structure that becomes narrower toward the side closer to the portion W.
Further, as shown in FIG. 7, when the rising angle on the application position C side is made more gradual, the gap generated between the two materials when the mating bonding material is overlapped is directed toward the side closer to the bonding portion W. It is also desirable that the bank portion 14 has a structure that gradually narrows.

That is, when the sealing material S made of a thermosetting resin enters a narrow gap on the side close to the joint W, this portion of the sealing material S becomes thin and has a small volume. It can be easily heated to the curing temperature and can be cured more rapidly. Therefore, the heating means of the sealing material S can be simplified. For example, when a laser beam is used, a laser beam apparatus with a smaller output can be adopted, and the equipment cost can be reduced.
In addition to heating means with a high energy density such as a laser beam, it is possible to use a simple device such as a high-frequency overheating device, a seam welding device, a hot roller with a built-in heater, etc., and the equipment cost can be reduced. .

In addition to the effect of preventing the inflow of the sealing material, the bank portion having the shape as described above can also exhibit the following derivative effects.
That is, since the bank 11 is continuously provided in parallel with the joining line, the bank 11 functions as a reinforcing bead as shown in FIG. Thus, the rigidity and strength of the member against bending in the joining line direction are improved.

Further, as shown in FIG. 9, a step 21 is continuously provided along the bank portion 11 formed on the aluminum alloy plate 10 on the side of the steel plate 20 covered from the upper side, and the two materials 10 and 20 are overlapped. At this time, the bank 11 and the vertical walls of the step 21 are brought into contact with each other. This facilitates positioning in the vertical direction with respect to the joining line of the two plates to be joined, and can contribute to a reduction in tact time during manufacturing.
In addition to this, the vertical wall of the step portion 21 and the bank portion 11 in both materials 10 and 20 are in contact with each other. When applied, the effect of reducing the load applied to the joint W by receiving the load between the vertical walls can be obtained. As a result, the strength of the joint can be improved.

Furthermore, in the joining of dissimilar metal materials, the linear expansion coefficients of the two materials are different. Therefore, when heat is applied to these materials, the difference in elongation between the two materials causes a shift between the materials, resulting in a shearing force at the joint. There's a problem.
In the case of a combination of the steel plate 20 and the aluminum alloy plate 10, the elongation of the aluminum alloy plate 10 is larger than the elongation of the steel plate 20 as shown in FIG. 11. However, since the step 21 of the steel plate 20 presses down the vertical wall of the bank portion 11 of the aluminum alloy plate 10 and bears a load between the vertical walls, the shearing force actually applied to the joint W is applied to the step 21 and the bank portion 11. Compared to the case where there is no, it can be made smaller.

FIG. 12 shows an example in which a groove portion is formed in a material to be joined as means for preventing the seal material S from flowing into the joint portion 11 as another embodiment of the present invention.
That is, as shown in the figure, in the aluminum alloy plate 10, a groove 15 that is recessed from the joint surface in a concave shape is continuously formed along the joint line between the joint W and the application position C of the sealing material S. Keep it. On the other hand, on the side of the steel plate 20, a groove portion 22 having a shape recessed from the joint surface is continuously formed at a position corresponding to the groove portion 14 of the aluminum alloy plate 10.

Next, the sealing material S is continuously applied along the groove portion 15 to the application position C of the sealing material on the aluminum alloy plate 10, and then the steel plate 20 is stacked on the aluminum alloy plate 10.
At this time, the sealing material S pressed in the thickness direction spreads in the lateral direction in the figure, but the moved sealing material S flows into the internal spaces of the groove portions 15 and 22 having a concave shape, so that the joint W It is possible to prevent the sealing material S from flowing into.

Then, the laser beam is irradiated and heated while moving the diode laser beam Bd from the steel plate 20 side to the position directly above the seal material S collected in the concave grooves 15 and 22, and the seal material collected in the grooves 15 and 22. S is cured.
Next, as in the above embodiments, the steel sheet 20 is heated by irradiating the joint W while moving the laser beam Bw defocused from the steel sheet 20 side. Subsequently, when the roller 51 is pressed immediately after the laser irradiation position, the joining interface is heated to a predetermined temperature by heat transfer from the steel plate 20 heated by the irradiation of the laser beam B. Similarly, the steel plate 20 and the aluminum alloy plate 10 are heated. Are joined at the joint W.

  Finally, after joining both materials 10 and 20, by continuously applying the sealing material S to the right end of the steel plate 20 in the figure, the overlapped portion of dissimilar metals is sealed by the sealing material S from both sides, Since the watertightness of the overlapped portion is maintained, it is possible to prevent electrolytic corrosion due to contact with different metals.

  Thus, by forming the groove portions 15 and 22 between the joint portion W and the application position C of the sealing material, the groove portions 15 and 22 spread out of the sealing material S when the different metal materials 10 and 20 are stacked. Therefore, the sealing material S does not flow into the joint portion. In addition, the side closest to the joint W of the sealing material S is cured, and the sealing material S is not softened by the irradiation of the high energy beam Bw at the time of joining and does not flow into the joint W, and is stable. Bonding is possible, and a dissimilar material joint having both high bonding strength and corrosion resistance can be obtained.

FIG. 13 shows an example in which both a groove portion and a bank portion are formed in a material to be joined as means for preventing the sealing material S from flowing into the joint portion.
As shown in the drawing, the aluminum alloy plate 10 is adjacent to the groove portion 16 recessed from the joint surface and the bank portion 17 rising in a convex shape between the joint portion W and the application position C of the sealing material. It forms continuously along a joining line. On the other hand, on the side of the steel plate 20, a groove portion 22 having a shape recessed from the joint surface is continuously formed at a position corresponding to the bank portion 17 of the aluminum alloy plate 10.

Then, after continuously applying the sealing material S along the groove 16 to the application position C of the sealing material on the aluminum alloy plate 10, the steel plate 20 is overlapped on the aluminum alloy plate 10.
At this time, since the groove portion 22 of the steel plate 20 is placed on the bank portion 16 of the aluminum alloy plate 10, the alignment of both plate materials becomes easy. Further, the sealing material S is crushed and spreads in the horizontal direction in the figure, but the sealing material S flows into the concave groove portion 16 and is blocked by the bank portion 17. Inflow of the sealing material S to W is prevented.

Next, the sealing material S accumulated in the groove portion 16 is heated by irradiating the diode laser beam Bd while moving the diode laser beam Bd from the side of the steel plate 20 to a position immediately above the sealing material S flowing into the concave groove portion 15. Is cured.
Subsequently, as in the above examples, the steel plate 20 and the aluminum alloy plate 10 are joined at the joint W by heating by irradiation with the defocused laser beam Bw and pressing by the roller 51 at a position immediately thereafter. At this time, similarly to the above, the inflow of the sealing material S to the joint portion W is more reliably ensured by the effect of preventing the inflow of the sealing material S by the groove portion 16 and the bank portion 17 and the hardening of the sealing material S by the diode laser beam Bd. Therefore, stable bonding can be achieved, and high bonding strength can be obtained.

  Finally, by continuously applying the sealing material S to the end of the steel plate 20, the joining and sealing treatment of both metal materials is completed, and a dissimilar joint joint having both high joining strength and good corrosion resistance is obtained. It is done.

As mentioned above, although the joining of the dissimilar metal which consists of an aluminum alloy plate and a steel plate has been demonstrated, this invention is not limited to these form examples.
For example, the combination of dissimilar metals is not limited to an aluminum alloy plate and a steel plate, but can be applied to various combinations where there is a concern about electrical corrosion due to contact of dissimilar metals. In addition, the present invention can be applied to stitch-like joining and multi-point spot joining. In addition to the cylindrical roller, various forms can be considered as the pressing means, and various applications are possible within the basic concept of the present invention.

It is a schematic explanatory drawing which shows an example of the dissimilar metal joining apparatus by this invention. It is a section explanatory view showing a 1st embodiment of the present invention. It is sectional explanatory drawing which shows the 2nd Embodiment of this invention which formed the bank part as an inflow prevention means of a sealing material. It is sectional explanatory drawing which shows the 3rd Embodiment of this invention by the example of another shape of a bank part. It is sectional explanatory drawing which shows the 4th Embodiment of this invention by the example of another shape of a bank part. It is sectional explanatory drawing which shows the 5th Embodiment of this invention by another example of a shape of a bank part. It is sectional explanatory drawing which shows the 6th Embodiment of this invention by another example of a shape of a bank part. It is a schematic explanatory drawing which shows the other effect in the dissimilar material joint shown in FIG. It is a schematic explanatory drawing which shows the further another effect in the dissimilar material joint shown in FIG. It is a schematic explanatory drawing which shows another effect in the dissimilar material joint shown in FIG. It is a schematic explanatory drawing which shows another effect in the dissimilar material joint shown in FIG. It is sectional explanatory drawing which shows the 7th Embodiment of this invention which formed the groove part as an inflow prevention means of a sealing material. It is sectional explanatory drawing which shows the 8th Embodiment of this invention which formed both the groove part and the bank part as an inflow prevention means of a sealing material. It is a graph which shows the relationship between the temperature of the sealing material which consists of thermosetting resins, and deformation resistance.

Explanation of symbols

10 Aluminum alloy sheet steel (dissimilar metal material)
11, 12, 13, 14, 17 Embankment 15,16 Groove 20 Steel plate (dissimilar metal material)
22 Groove 50 Laser irradiation head (high energy beam irradiation head)
52 Diode laser irradiation head (heating means)
W Joint C Application position of sealing material Bw Laser beam (high energy beam)
S sealing material

Claims (6)

When irradiating a high energy beam to the dissimilar metal materials superimposed in a state where a sealing material made of a thermosetting resin is applied in the vicinity of the joint,
Dissimilar metal joining method characterized by heating at least the end of the applied sealing material on the joining portion side to reduce the fluidity of the sealing material and then irradiating the joining portion with a high energy beam .   2. The dissimilar metal joining method according to claim 1, wherein an inflow blocking means for preventing inflow of the seal material into the joint portion is provided between the application position of the seal material and the joint portion.   3. The dissimilar metal joining method according to claim 2, wherein the inflow blocking means is a bank portion having a convex shape or a step shape with respect to the joining surface.   4. The method for joining dissimilar metals according to claim 2, wherein the inflow blocking means is a groove that is recessed in a concave shape with respect to the joining surface.   The said bank part is provided with the multistage shape, The joining method of the dissimilar material of Claim 3 characterized by the above-mentioned.   A high energy beam irradiation head for irradiating a high energy beam to the joint portion of the dissimilar metal material superposed in a state where a sealing material made of a thermosetting resin is applied in the vicinity of the joint portion; and the high energy beam irradiation head; A heating means that is integrally attached and heats at least the joint side end of the sealing material, and that the heating means moves relative to the dissimilar metal material integrally with the high energy beam irradiation head. A dissimilar metal joining device.

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