• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention provides a laser welding method that prevents defects in welding cracks from occurring in a welded portion when laser welding different types of carbon steel having different carbon contents. A hub with a low carbon content in manufacturing a vehicle wheel 1 by laser welding a joint between a carbon steel boss 2 for a mechanical structure having a carbon content of about 0.2% and a rolled steel hub 3 having a carbon content of about 0.1%. The laser is irradiated in the oblique direction with respect to the joint surface from the (3) side, and it welds so that the edge part of the hub 3 may melt | dissolve. Moreover, generally, a laser is irradiated and welded to the joint surface in the diagonal direction from the carbon steel side with little carbon content.
    公开号:KR19980081596A
    申请号:KR1019980014291
    申请日:1998-04-22
    公开日:1998-11-25
    发明作者:미츠요시히로시；기타무라가오루
    申请人:가와모토노부히코；혼다기켄코교가부시키가이샤；
    IPC主号:
    专利说明:

    Laser welding method of carbon steel
    TECHNICAL FIELD This invention relates to the welding technique of the wheel for a vehicle, for example.
    Conventionally, as a welding technique for a wheel for a vehicle, the present applicant has proposed a laser welding method such as Japanese Patent Application No. Hei 8-28358.
    In order to reduce the number of machining steps and to concentrate the steps, this method is used for vehicles consisting of four-point parts, for example, rims, spokes, hubs, and bosses. When welding wheels, the rims and spokes, the spokes and hubs, and the welds of the hubs and bosses are welded by laser welding with little effect from thermal deformation.
    By the way, in order to improve workability, components such as rims, spokes, hubs, and the like are used with a rolled steel sheet having a low carbon content, whereas a boss that is easily subjected to a force directly from an axle or the like has a higher carbon content than a rolled steel sheet. The rigid mechanical structure carbon steel is used. When laser welding the hubs and bosses with different carbon contents, there is a problem that welding cracks are easily generated in the welded portion when the laser is irradiated in the vertical direction with respect to the welded portion.
    That is, as shown in Fig. 4, the tubular boss 51 is coupled to the hub 52, and as shown in Fig. 4A, the laser is irradiated in the vertical direction with respect to the joint from the arrow direction. When fusion | melting so that the edge part of 51 may be melt | dissolved, the crack c may generate | occur | produce in the welding part y as shown to FIG. 4 (B).
    This is because the laser is irradiated to the steel side with a relatively high carbon content, thereby reducing the ductility of the fused metal of the welded portion, and the laser welding is rapidly heated and quenched. It is thought that crack (c) occurs because it cannot endure.
    Therefore, an object of the present invention is to improve the welding quality by preventing defects in welding cracks when laser welding different types of carbon steel having different carbon contents such as the hub and the boss.
    In order to achieve the above object, the present invention relates to a laser welding method of claim 1, wherein the laser irradiation is directed toward a joint surface of different types of carbon steels having different carbon contents, and the joint surfaces are fused and welded. The irradiation direction of the laser was irradiated in the oblique direction with respect to the bonding surface from the carbon steel side with less carbon content.
    As described above, when the laser is irradiated in the oblique direction from the side of the carbon steel having a low carbon content to the joint surface, the end portion of the carbon steel having the low carbon content is fused to melt so that the shape of the welded portion is not required without using a filler wire or the like. It can be smoothed, and the residual stress can be widely dispersed to achieve stress relaxation, thereby preventing the occurrence of cracks.
    Moreover, in Claim 2 of a claim, the said one carbon steel was made into the rolled steel sheet, and the other carbon steel was made into the mechanical structure carbon steel.
    Here, a rolled steel plate means steel for plates, such as SPC, SPH, SAPH, etc. of JIS standard, and carbon steel for mechanical structures means carbon steel, such as JIS symbol S20C.
    Further, in claim 3 of the claims, the carbon content of the carbon steel for mechanical structure was 0.15% or more, and the carbon content of the rolled steel sheet was less than 0.15%.
    That is, the present invention is particularly effective for laser welding of carbon steel having such a carbon content.
    Further, in claim 4 of the claims, the laser welding method of the carbon steel is applied to the joining of the hub and the boss or the spoke and the boss of the vehicle wheel.
    In general, since the boss of the vehicle wheel is a carbon steel having a higher carbon content than the hub and the spoke, the boss is applied to the welding of the hub and the boss and the spoke and the boss, and the laser beam is welded at an angle from the hub side or the spoke side.
    Here, the joining of the hub and the boss is a case of a wheel having a four-point part, and the joining of the spoke and the boss is a case of a wheel having a three-point part.
    1 is a plan view of a vehicle wheel (wheel) to which the welding method of the present invention is applied.
    2 is a longitudinal sectional view of the wheel;
    3 is an explanatory diagram of a laser welding method according to the present invention;
    4 is an explanatory diagram for explaining a deficiency of a laser welding method.
    * Explanation of symbols for the main parts of the drawings
    1: wheel 2: boss
    3: hub 4: spoke
    5: rim c: crack
    y: weld
    EMBODIMENT OF THE INVENTION Embodiment of this invention is described based on an accompanying drawing.
    1 is a plan view of a wheel for a vehicle to which the welding method of the present invention is applied, FIG. 2 is a longitudinal sectional view of the wheel, and FIG. 3 is an explanatory view of a laser welding method according to the present invention.
    The laser welding method of the present invention is a technique for increasing the joint strength by preventing welding cracks from occurring in the welded portion when laser welding different types of carbon steel having different carbon contents, and specifically, It applies to the welding of the wheel 1 for a vehicle as shown in FIG. 1 and FIG.
    That is, the wheel 1 for a vehicle has a boss 2 that fits the wheel shaft, a hub 3 having a coupling hole coupled to the boss 2, and a coupling hole coupled to the hub 3. It consists of a four-piece part of a spoke 3 of a substantially triangular plate shape and a rim 5 surrounding the outer periphery of the spoke 4, and the boss 2, the hub 3, and the hub. Each joining part of (3), the spoke 4, the spoke 4, and the rim 5 is joined by laser welding.
    In each of the component parts, the bosses 2 are formed by forging molding carbon steel for mechanical structures such as JIS symbol S20C, and the carbon content is about 0.18 to 0.23%.
    In addition, the hub 3, the spokes 4, and the rim 5 are all formed by press molding or rim molding the rolled steel plate represented by JIS symbol SPC, SPH, SAPH, etc., and carbon content is about 0.08 to 0.12%.
    The problem in the case of laser welding each component here is the joining of carbon steels with different carbon contents. That is, it is welding of the junction part of the boss | hub 2 and the hub 3, and when irradiating a laser from the direction shown with the dotted line of FIG. 2 with respect to this junction part, as shown to FIG. 4 (B), the weld part y is shown. The crack c is generated as described above.
    Therefore, in this invention, a laser is irradiated from the direction shown by the solid line of FIG. 2, and the whole welding part is welded along the circumferential direction, for example.
    That is, as shown in the enlarged view of FIG. 3A, a laser is irradiated obliquely from the hub 3 side with respect to a joining surface, and it welds so that the edge part of the hub 3 may melt | dissolve.
    Then, as shown in FIG. 3 (B), the end portion of the hub 3 and a part of the boss 2 melt and fuse, and the weld portion y can be made smooth even without using a filler wire or the like. It is possible to prevent the occurrence of cracks.
    When the laser is irradiated from the hub 3 side with low carbon content, the ductility decrease of the fused metal of the weld portion y is suppressed, and the followability to shrinkage deformation during solidification is improved, thereby preventing the occurrence of cracks. I think it is.
    In addition, in the case of a vehicle wheel (not shown) of a three-point part, it is applied to the joint portion of the boss and the spoke, and when the laser is fused at an angle from the spoke side to fuse to dissolve the spoke end, the occurrence of cracks can be similarly prevented. .
    In addition, although the above description has been described taking the case of a vehicle wheel as an example, the laser welding method of the present invention can be applied not only to the joining of a vehicle wheel, but also to welding of different carbon steels having different carbon contents in general, and having a carbon content. The welding crack can be prevented and welding quality can be improved by irradiating and welding a laser in the diagonal direction with respect to a joining surface from this little carbon steel side.
    As described above, in the laser welding method of the present invention, when joining different types of carbon steel having different carbon contents, the irradiation direction of the laser is to be irradiated in an oblique direction to the joint surface from the carbon steel side having less carbon content, so that the filler wire It is possible to smooth the shape of the welded portion without using the back and the like, and prevent the occurrence of cracks.
    In addition, when the laser welding method is applied to the hub and boss of the vehicle wheel or the spoke and the boss, the welding quality of the vehicle wheel can be improved, and the productivity can be improved.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] A laser welding method in which a laser is irradiated toward a joint surface of heterogeneous carbon steel having a different carbon content, and the joint surface is fused and welded, wherein the irradiation direction of the laser is directed from the side of the carbon steel having a low carbon content to the joint surface. Laser welding method of carbon steel, characterized in that irradiated in an oblique direction with respect to.
    [2" claim-type="Currently amended] The method for laser welding of carbon steel according to claim 1, wherein the one carbon steel is a rolled steel sheet and the other carbon steel is carbon steel for mechanical structure.
    [3" claim-type="Currently amended] 3. The laser welding method of carbon steel according to claim 2, wherein the carbon content of the carbon steel for mechanical structure is 0.15% or more, and the carbon content of the rolled steel sheet is less than 0.15%.
    [4" claim-type="Currently amended] 4. The laser welding method for carbon steel according to any one of claims 1 to 3, wherein the laser welding method for the carbon steel is applied to the joining of the hub and the boss of the vehicle wheel or the spoke and the boss.
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    同族专利:
    公开号 | 公开日
    ES2146536A1|2000-08-01|
    ITRM980265A1|1999-10-25|
    ES2146536B1|2001-03-01|
    CN1198975A|1998-11-18|
    ID20199A|1998-10-29|
    IT1299439B1|2000-03-16|
    ITRM980265D0|1998-04-24|
    TW418146B|2001-01-11|
    CN1106243C|2003-04-23|
    US6066828A|2000-05-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-04-24|Priority to JP10698197
    1997-04-24|Priority to JP9-106981
    1998-04-22|Application filed by 가와모토노부히코, 혼다기켄코교가부시키가이샤
    1998-11-25|Publication of KR19980081596A
    2001-06-01|Application granted
    2001-06-01|Publication of KR100272380B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP10698197|1997-04-24|
    JP9-106981|1997-04-24|
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