WO2021065067A1

WO2021065067A1 - Welding method, plate-shaped member, and elevator equipment

Info

Publication number: WO2021065067A1
Application number: PCT/JP2020/019053
Authority: WO
Inventors: 裕企雄佐藤; 督生川崎; 郁馬肥後; 光彦渡邉
Original assignee: 三菱電機株式会社
Priority date: 2019-09-30
Filing date: 2020-05-13
Publication date: 2021-04-08

Abstract

This welding method for overlaying and welding a first member (10) and a second member (20) includes a holding step and a melting step. In the holding step, the first member (10), in which a groove (11) has been formed, and the second member (20) are held with the surface of the first member (10) in which the groove (11) has been formed in contact with the second member (20). In the melting step, a welding target region R of the first member (10) and the second member (20), defined along the groove (11), is melted. At least either one of the surface of the first member (10) in which the groove (11) has been formed, and the surface of the second member (20) that comes into contact with the first member (10), has a coating layer.

Description

Welding method, plate members and elevator equipment

This disclosure relates to welding methods, plate members and elevator equipment.

Galvanized steel sheets are widely used for structural members and building materials including housings for car bodies and office equipment for the purpose of rust prevention. For welding thin steel sheets, laser welding, which enables high-speed deep penetration welding, has a small heat effect, and has low distortion, is being applied. In lap welding of galvanized steel sheets, it is necessary to take measures to allow zinc vapor to escape in order to prevent welding defects due to diffusion of zinc vapor melted by laser heat into the steel sheet base material and contamination due to residual zinc. There is a method of forming a predetermined gap in the area where the steel plates are overlapped with each other.

Generally, a spacer or jig is used to provide a gap between the members to be welded to be overlapped, and steam escapes from the gap. Further, in Patent Document 1, a protrusion is formed on one galvanized steel sheet and a recess is formed on the other galvanized steel sheet, and the protrusion is fitted into the recess to form a gap between the two galvanized steel sheets. , Discloses a method of allowing zinc vapor to escape from this gap.

Japanese Unexamined Patent Publication No. 2013-237053

However, if a spacer or jig is used to provide a gap between the members to be welded to be overlapped and welded, the cost increases and it is difficult to maintain the gap, so that it is difficult to maintain the quality of welding. Further, depending on the size of the gap between the members to be welded, it is easy to tolerate the deformation of the members due to the heat of welding, and there is a problem that high quality cannot be obtained in a product that requires design.

Further, since the method disclosed in Patent Document 1 is a method of forming a protrusion and a recess in a steel plate to provide a gap, it is difficult to apply the method when joining flat members to be welded. There is a problem that the shape of the member to be welded cannot be freely determined.

The present disclosure has been made in view of the above-mentioned actual conditions, and an object of the present disclosure is to provide a high-quality welding method, plate-shaped member, and elevator equipment whose shape can be freely determined.

In order to achieve the above object, the welding method according to the present disclosure is a welding method in which a first member and a second member are overlapped and welded, and a grooved first member and a second member are formed. A holding step of holding the member in contact with the surface of the second member on the side where the groove of the first member is formed, and of the first member and the second member defined by the groove. It comprises a melting step of melting the first member and the second member in the area to be welded, and abuts the grooved surface of the first member with the first member of the second member. The coating layer is provided on a surface and at least one of the surfaces.

According to the present disclosure, the shape can be freely determined, and high-quality welding methods, plate-shaped members, and elevator equipment can be easily provided.

Cross-sectional view of a first member and a second member welded by the welding method according to the embodiment of the present disclosure. Perspective view of the first member and the second member welded by the welding method according to the embodiment of the present disclosure. A flowchart showing a welding method according to an embodiment of the present disclosure. A development view of the first member to be welded by the welding method according to the embodiment of the present disclosure. Enlarged sectional view of the first member and the second member welded by the welding method according to the embodiment of the present disclosure. Sectional drawing of the overlapped first member and the second member to be welded by the welding method which concerns on embodiment of this disclosure. Enlarged sectional view of the stacked first member and second member welded by the welding method according to the embodiment of the present disclosure. Cross-sectional view of the first member and the second member welded by the welding method according to the embodiment of the present disclosure. Enlarged sectional view of the first member and the second member welded by the welding method according to the embodiment of the present disclosure. Perspective view of the first member and the second member welded by the welding method according to the embodiment of the present disclosure. Enlarged sectional view of the first member welded by the welding method according to the modified example of the present disclosure. Enlarged sectional view of the first member welded by the welding method according to the modified example of the present disclosure. Enlarged sectional view of the first member welded by the welding method according to the modified example of the present disclosure. The figure which shows the 1st member to be welded by the welding method which concerns on the modification of this disclosure. The figure which shows the 1st member to be welded by the welding method which concerns on the modification of this disclosure. The figure which shows the 1st member to be welded by the welding method which concerns on the modification of this disclosure. The figure which shows the 1st member to be welded by the welding method which concerns on the modification of this disclosure. Partial enlarged view showing a first member welded by the welding method according to the modified example of the present disclosure. Partial enlarged view showing a first member welded by the welding method according to the modified example of the present disclosure. The figure which shows the 1st member to be welded by the welding method which concerns on the modification of this disclosure. The figure which shows the overlapped 1st member and 2nd member which are welded by the welding method which concerns on the modification of this disclosure.

Hereinafter, the overlay welding method and the plate-shaped member according to the embodiment of the present disclosure will be described.

The welding method according to the present embodiment is a method of welding the first member 10 shown in FIGS. 1 and 2 to the second member 20, and as shown in FIG. 3, a groove is formed in the first member 10. A groove forming step (step S101) for forming 11 and a processing step (step S102) for bending the first member 10 into the shape of a reinforcing member, and superimposing the first member 10 on the second member 20. The holding step (step S103) for holding and the melting step (step S104) for melting the welding target region R of the first member 10 and the second member 20 are provided.

To facilitate understanding, set xyz coordinates that are orthogonal to each other and refer to them as appropriate. The direction in which the groove 11 formed in the first member 10 extends is set as the x direction, the direction perpendicular to the x direction and the thickness direction of the second member 20 is set as the y direction, and the thickness direction of the second member 20 is set as the z direction. To do. The xy plane is a plane parallel to the third surface 21 of the second member 20.

As shown in FIGS. 4 and 5, a groove forming step (step S101) of forming a pair of linear grooves 11 along the x direction on the first surface 12 of the first member 10 is executed. The first member 10 is formed by coating both surfaces of a steel plate base material mainly composed of iron with zinc or zinc-plated

layers

12a and 13a mainly composed of zinc, and the boiling point of zinc is about 900 ° C. It is lower than the melting temperature of about 1500 ° C. The thickness t1 of the first member 10 may have a thickness that secures the strength used as the reinforcing member, and is preferably 0.5 mm or more and 3.0 mm or less. The groove 11 is formed by scraping off the first surface 12 with a groove processing tip. The cross section of the groove 11 is rectangular. At this time, the galvanized layer 12a in the portion where the groove 11 is formed is removed. Further, the end portion 11a of the groove 11 is formed at a position that does not reach the end portion 10a of the first member 10. This is because when the first member 10 is superposed on the second member 20, the space between the groove 11 and the second member 20 becomes a closed space. Therefore, the length L1 of the groove 11 in the x direction is shorter than the length L2 of the first member 10 in the x direction. When the closed space is formed, if the zinc-plated layer 21a is formed on the second member 20 described later, the zinc vapor stays in the groove 11 and a sacrificial anticorrosion action can be obtained.

The lower limit of the depth h1 of the groove 11 is equal to or larger than the thickness of the galvanized layer 12a, and when the first member 10 and the second member 20 are overlapped, the space between the groove 11 and the second member 20 is formed. The depth is such that the galvanized layer 21a of the second member 20 can release the evaporated vapor. The upper limit of the depth h1 of the groove 11 is a depth capable of forming a penetration of the second member 20 by 0.1 mm or more. Specifically, the depth h1 is preferably 0.02 mm or more and 0.2 mm or less, and more preferably 0.05 mm or more and 0.1 mm or less with respect to the plate thickness of 1.0 mm or more and 2.0 mm or less. Further, the lower limit of the width w1 of the groove 11 is preferably larger than the width at which the first member 10 is melted in the melting step (step S104). As a result, the vapor vaporized by the galvanized layer 21a can escape. The upper limit of the width w1 of the groove 11 is preferably 5 times, more preferably 3 times, the width of melting the first member 10 in the melting step (step S104). As a result, the portion from which the galvanized layer 12a is removed can be reduced. Corrosion can be prevented by reducing the part where the zinc plating is removed. Specifically, the width w1 is preferably 1 mm or more and 5 mm or less, and more preferably 2 mm or more and 4 mm or less.

Next, a processing step (step S102) of processing the first member 10 on which the groove 11 is formed into a shape having a hat-shaped cross section is executed. Specifically, the valley fold line 14 shown in FIG. 4 is bent at a right angle to the valley fold, and the mountain fold line 15 is bent at a right angle to the mountain fold. As a result, the first member 10 having the hat-shaped cross section shown in FIGS. 1 and 2 can be obtained. In addition, in order to manufacture efficiently, it is preferable to continuously execute the groove forming step (step S101) and the machining step (step S102) by a machine tool including a turret punch press.

Next, as shown in FIGS. 6 and 7, a holding step (step S103) of superimposing and holding the first member 10 on the second member 20 is executed. Similar to the first member 10, the second member 20 is formed by coating both surfaces of a steel plate base material mainly composed of iron with zinc or zinc-plated

layers

21a and 22a mainly composed of zinc. The second member 20 is a design panel used for a landing door, a car door, or a car room wall of an elevator facility, and is a third surface 21 that comes into contact with the first surface 12 of the first member 10. , A fourth surface 22 which is the back surface of the third surface 21. Here, the contact means that the surface portions of each other are in contact with each other. The fourth surface 22 is a design surface that appears on the appearance of the product. The thickness t2 of the second member 20 may have a thickness that secures the strength used as the design panel, and is preferably 1.0 mm or more and 2.0 mm or less. Specifically, first, the second member 20 is placed at a position where the fourth surface 22 of the second member 20 is in contact with the surface plate of the laser apparatus. Next, the first member is aligned with the mounting position of the second member 20 at the position where the third surface 21 of the second member 20 and the first surface 12 of the first member 10 are in contact with each other. Place 10 on it. After that, the second surface 13 on the back surface of the first surface 12 is pressed and brought into contact with each other to hold it. As a result, the first surface 12 of the first member 10 and the third surface 21 of the second member 20 come into contact with each other, and the groove 11 of the first member 10 and the third surface of the second member 20 come into contact with each other. Space 16 is formed by 21. Since the end portion 11a of the groove 11 is formed at a position where it does not reach the end portion 10a of the first member 10, the space 16 is a closed space. It is preferable that the space 16 has a volume in which the pressure inside the space 16 does not exceed the reference value due to the steam generated by the irradiation of the laser. The reference value is a pressure at which blow holes and sputtering are not generated due to the pressure of the steam of the galvanized layer 21a evaporated by welding, for example, 2 atm. A region suitable for welding is a welding target region R defined along the groove 11 of the first member 10.

Next, a melting step (step S104) of melting the welding target region R of the first member 10 and the second member 20 is executed. The melting step (step S104) is performed using a laser apparatus. In laser welding, narrow beads and deep penetration shapes can be obtained due to the steep energy density distribution that is characteristic of lasers. From this, even if it is a thin steel plate, high-speed and precise heat input control can be performed regardless of the material such as the steel plate member or the stainless steel material. Therefore, the heat effect on the member to be welded is small, and the appearance surface can be welded with low distortion. In addition, since the laser device is easy to automate, welding can be performed more efficiently, so welding by laser is adopted.

The laser device includes an optical system including a laser oscillator, various mirrors, a condenser lens, a welding head device that moves the laser head to a desired position, and the shapes of the first member 10 and the second member 20. An image recognition processing device that monitors the welding position and condition, various sensors including a distance measurement sensor and a temperature sensor, processing programs, and various data are stored, and a laser oscillator and welding head are stored based on the recognition results of the image recognition processing device. It is equipped with a control device that controls the drive device and the like. In order to further improve the welding quality, the laser apparatus may also have a function of measuring the thickness of the first member 10 and the second member 20 and irradiating the laser with an output suitable for the thickness.

A laser is continuously applied to the first member 10 and the second member 20 placed on the surface plate of the laser apparatus from the direction of the arrow 200 to the welding target region R of the second surface 13 of the first member 10. Or irradiate intermittently. The output of the laser is controlled to an output that does not cause welding marks on the fourth surface 22 of the second member 20. Preferably, the penetration depth of the second member 20 is controlled to 0.1 mm or more and 0.3 mm or less. The direction of the arrow 200 is the direction perpendicular to the second surface 13 and is the −z direction. When the laser is irradiated, the steel plate base material in the welding target region R melts, and the boiling point of zinc is lower than the melting point of the steel plate base material, so that the

galvanized layers

12a, 13a, and 21a evaporate. When the galvanized layer 13a arranged on the second surface 13 of the first member 10 evaporates, it diffuses in the z direction. Since the galvanized layer 12a arranged on the first surface 12 of the first member 10 is removed when the groove 11 is formed, zinc vapor is not generated. Even if the galvanized layer 12a remains on the first surface 12, the vaporized vapor moves in the x direction or the −x direction inside the space 16 and escapes to the space 16 to obtain the vaporized vapor. Pressure is relieved and welding defects are suppressed. The vapor vaporized by the galvanized layer 21a arranged on the third surface 21 of the second member 20 moves in the x direction or the −x direction inside the space 16, and the steam escapes to the space 16 to cause the vapor. Pressure is relieved and welding defects are suppressed. Since the space 16 is a closed space, the vapor evaporated from the galvanized layer 21a is not released to the outside but stays there, and when the temperature drops, it adheres to the zinc-removed portion of the groove 11 and can prevent corrosion. .. The galvanized layer 22a arranged on the fourth surface 22 of the second member 20 does not evaporate because the steel plate base material does not melt up to that portion. When the temperature of the welding target region R of the first member 10 and the second member 20 rises due to the irradiation of the laser, the welding target region R partially melts and the temperature drops, as shown in FIGS. 8 and 9. When solidified, it becomes a welded portion 30, and when it melts, the melted first member 10 and the second member 20 protrude into the groove 11, and the protruding portion 31 is also formed. Further, since the zinc-plated layer 13a partially reaches the space formed by the groove 11 and the protruding portion 31 by the irradiation of the laser, the corrosion resistance of this space is enhanced by the sacrificial anticorrosion of the zinc plating. As a result, the plate-shaped member 100 shown in FIG. 10 in which the first member 10 and the second member 20 are welded is obtained.

The plate-shaped member 100 includes a first member 10 which is a reinforcing member, a second member 20 which is a design panel, and a welded portion 30 which joins the first member 10 and the second member 20. ..

The first member 10 has a hat-shaped cross-sectional shape, and has a pair of grooves 11 extending in the x direction on the first surface 12. The first surface 12 of the peripheral portion of the groove 11 is a flat surface and is in contact with the third surface 21 of the second member 20. The first member 10 has the same configuration as that described in the welding method described above.

Similar to the first member 10, the second member 20 is formed by coating both sides of a steel plate base material mainly composed of iron with zinc or zinc-plated

layers

21a and 22a mainly composed of zinc. The second member 20 is a design panel used for a landing door, a car door, or a car room wall of an elevator facility, and is a third surface 21 that comes into contact with the first surface 12 of the first member 10. , A fourth surface 22 which is the back surface of the third surface 21. The third surface 21 is a plane that can come into contact with the first surface 12 of the first member 10. The fourth surface 22 is a design surface that appears in the appearance. The thickness t2 of the second member 20 may have a thickness that secures the strength used as the design panel. Elevator equipment will be installed inside the building. For this reason, the design panels used in elevator equipment place importance on harmony with the interior of the building, and various appearances are required according to the indoor equipment. For example, it is manufactured by various means such as painting the fourth surface 22 or attaching a stainless steel material to perform hairline, etching or mirror finish.

The welded portion 30 is a portion where the temperature of the first member 10 and the second member 20 are melted by laser irradiation and then the temperature is lowered to solidify, and the welded portion 30 includes a protruding portion 31. In the protruding portion 31, when the laser is irradiated, the melted first member 10 and the second member 20 protrude into the groove 11, and the first member 10 and the second member 20 protruding into the groove 11 Is solidified. The joint cross section of the welded portion 30, the first member 10 and the second member 20 is larger than that in the case where the protruding portion 31 is not provided, and the joint strength between the first member 10 and the second member 20 is increased. Will also grow.

As described above, according to the welding method and the plate-shaped member of the present embodiment, by forming the groove 11 in the first member 10, a space is provided between the first member 10 and the second member 20. The vapor of the zinc-plated layer 21a formed and evaporated by the laser irradiation moves in the x-direction or −x direction inside the space 16, and the vapor escapes to the space 16 to relieve the pressure. Welding defects are suppressed. Since the space 16 is a closed space, the vapor vaporized by the galvanized layer 21a is not released to the outside but stays there, and when the temperature drops, it adheres to the inner wall of the space 16 and thereby forms the groove 11. Since the galvanized layer 12a is reformed at the portion where the galvanized layer 12a is removed, corrosion can be prevented. Further, by forming the groove 11 in the first member 10, welding defects can be suppressed, so that it can be easily carried out at low cost.

Further, what the first member 10 and the second member 20 are melted by the irradiation of the laser protrudes into the groove 11, and the protruding portion 31 is formed. As a result, the joint cross section becomes larger and the joint strength between the first member 10 and the second member 20 becomes larger than that in the case where the groove 11 is not provided. In particular, when the depth h1 of the groove 11 is 0.02 mm or more and 0.2 mm or less with respect to the plate thickness of 1.0 mm or more and 2.0 mm or less, the joint strength is stably increased and 0.05 mm or more and 0.1 mm or less. Then, the joint strength becomes larger. Further, since the depth h1 of the groove 11 is a depth that does not deform the first member 10, it is possible to prevent the first member 10 from being deformed by the heat during welding.

Further, it suffices as long as the groove 11 is formed in the first member 10 and the first member 10 and the second member 20 can be overlapped with each other, and the shape can be freely determined. Therefore, the second member 20 Can be welded even if it is required to be flat. Further, since the depth h1 of the groove 11 determines the gap through which the vaporized vapor of the galvanized layer 21a escapes, it is easy to manage the gap for steam escape. Further, since the groove 11 can be formed in the first member 10 by the machining tip, the groove forming step (step S101) and the machining step (step S102) can be continuously executed by a machine tool including a turret punch press. Therefore, the processes can be integrated and the process can be simplified. As described above, high-quality welding can be easily realized at low cost.

(Modification example)
In the above-described embodiment, an example in which the first member 10 is a reinforcing member having a hat-shaped cross section and the second member 20 is a design panel of an elevator facility has been described. The shapes of the first member 10 and the second member 20 are not particularly limited as long as they can be welded on top of each other. The shapes of the first member 10 and the second member 20 may include a curved surface shape as long as they can be welded on top of each other.

In the above-described embodiment, an example in which the cross section of the groove 11 of the first member 10 is rectangular has been described, but the cross-sectional shape of the groove 11 is not limited as long as the space 16 is formed. For example, the cross-sectional shape of the groove 11 may be triangular as shown in FIG. 11A, semicircular as shown in FIG. 11B, or trapezoidal as shown in FIG. 11C. Good. By doing so, the shape of the space 16 can be made easier for the vapor of the galvanized layer 21a to escape.

Further, in the above-described embodiment, an example in which the groove 11 is formed linearly has been described. The groove 11 only needs to allow the vapor of the galvanized layer 21a to escape, and the shape of the groove 11 formed on the first surface 12 of the first member 10 is not particularly limited. The groove 11 may be formed in a zigzag shape as shown in FIG. 12A, or may be formed in a meandering manner as shown in FIG. 12B. By doing so, the length of the welded portion 30 can be increased, and the first member 10 and the second member 20 can be joined more strongly. Further, the groove 11 may be formed into a quadrangle in a plan view as shown in FIG. 12C, and may be formed in a shape in which a pair of semicircles are connected by a pair of straight lines in a plan view as shown in FIG. 12D. May be done. Even in these cases, the length of the welded portion 30 can be increased, and the first member 10 and the second member 20 can be joined more strongly. Since the grooves 11 shown in FIGS. 12C and 12D are provided along the closed line shape, the volume of the space 16 can be increased and the pressure of the vapor of the galvanized layer 21a can be relatively reduced.

In the above-described embodiment, an example in which the second surface 13 of the first member 10 does not have a mark indicating the position of the groove 11 has been described. A mark 17 indicating the position of the groove 11 may be provided on the second surface 13. As shown in FIG. 13A, the mark 17 may be provided at a position indicating the end portion 11a of the groove 11. Further, as shown in FIG. 13B, a linear mark 17 may be provided along the groove 11. The mark 17 is provided by laser marking, engraving, press working with a die, or the like. The mark 17 makes the position of the groove 11 clear, and serves as a mark indicating the position when irradiating the welding target area R with the laser. Further, if the mark 17 is photographed with a camera and the image is recognized, automatic welding can be easily performed.

In the above-described embodiment, an example in which the end portion 11a of the groove 11 is formed at a position where it does not reach the end portion 10a of the first member 10 has been described. The groove 11 only needs to be able to release the vapor of the galvanized layer 21a, and as shown in FIG. 14, the groove 11 is provided at a position where the end portion 11a of the groove 11 reaches the end portion 10a of the first member 10. It may be formed. In this case, as shown in FIG. 15, the space 16 formed by superimposing the first member 10 on the second member 20 is a space that reaches the end portion 10a and is open. As a result, the steam of the galvanized layer 21a can be discharged to the outside, and the pressure of the steam can be further reduced.

In the above-described embodiment, the first member 10 and the second member 20 coat both sides of the iron-based steel plate base material with zinc or zinc-based zinc-plated

layers

12a, 13a, 21a, 22a. I explained an example of what was done. The first member 10 and the second member 20 are galvanized on at least one surface of the first surface 12 of the first member 10 and the third surface 21 of the second member 20. It may have a coating layer including a layer. The first member 10 may have a zinc-plated layer 12a on the first surface 12, and the second member 20 may be a member having no coating layer. In this case, since the galvanized layer 12a of the welding target region R is removed by forming the groove 11, the generation of zinc vapor can be suppressed and welding defects can be suppressed. Further, the first member 10 may be a member having a zinc-plated layer 21a on the third surface 21 of the second member 20 and having no coating layer. In this case, the effect of allowing the vapor of the galvanized layer 21a to escape to the space 16 can be obtained. Further, the first member 10 and the second member 20 may have another coating layer instead of the galvanized layer. When the melting points of the base materials of the first member 10 and the second member 20 are higher than the boiling points of the coating layer, the effect of allowing the vapor of the coating layer to escape to the space 16 can be similarly obtained.

In the above-described embodiment, an example in which the groove 11 is formed by scraping the groove 11 with a groove processing tip in the groove forming step (step S101) has been described. As long as the specified groove 11 can be formed in the groove forming step (step S101), the method for forming the groove 11 is not limited, and the groove 11 may be formed by pressing. In this case, since the coating layer is not removed, corrosion can be further prevented.

In the above-described embodiment, an example of bending the first member 10 into a shape having a hat-shaped cross section in the processing step (step S102) has been described. In the processing step (step S102), processing other than bending processing may be performed, and one or more of processing including bending processing, cutting processing, and drilling processing may be performed.

In the above-described embodiment, an example in which the melting step (step S104) is executed by using the laser apparatus has been described. If the welding target region R of the first member 10 and the second member 20 can be melted, the welding target region R may be melted by another method.

In the above-described embodiment, an example in which the plate-shaped member 100 is used as a design panel for elevator equipment has been described. According to the present embodiment, no welding mark is left on the surface of the design panel, and the appearance of the material is not spoiled. It is also excellent in fire resistance. The equipment in which the plate-shaped member 100 is used is not limited, and even if the plate-shaped member 100 is used for a self-standing board such as a switchboard and a control board, an indoor unit and an outdoor unit provided in an air conditioner, a water heater, and a lighting device. Good.

The present disclosure allows for various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Moreover, the above-described embodiment is for explaining this disclosure, and does not limit the scope of the present disclosure. That is, the scope of the present disclosure is indicated by the scope of claims, not by the embodiment. And, various modifications made within the scope of claims and the equivalent meaning of disclosure are considered to be within the scope of this disclosure.

This application is based on Japanese Patent Application No. 2019-179657 filed on September 30, 2019. The specification, claims, and drawings of Japanese Patent Application No. 2019-179657 are incorporated herein by reference.

10 1st member, 10a end, 11 groove, 11a end, 12 1st surface, 12a galvanized layer, 13 2nd surface, 13a galvanized layer, 14 valley fold line, 15 mountain fold line, 16 Space, 17 mark, 20 second member, 21 third surface, 21a galvanized layer, 22 fourth surface, 22a galvanized layer, 30 welded part, 31 protruding part, 100 plate-shaped member, 200 arrow, R Area to be welded.

Claims

It is a welding method in which a first member and a second member are overlapped and welded.
A holding step of holding the first member in which a groove is formed and the second member in contact with the surface of the second member on the side surface of the first member on which the groove is formed. When,
A melting step of melting the first member and the second member within the welding target region of the first member and the second member defined by the groove.
With
The coating layer is provided on at least one of the surface of the first member on which the groove is formed and the surface of the second member that comes into contact with the first member.
Welding method.
A groove forming step for forming the groove in the first member is provided.
In the holding step, the first member in which the groove is formed in the groove forming step and the second member are held.
The welding method according to claim 1.
In the melting step, the welding target region of the first member and the second member is formed by irradiating the back surface of the groove-formed surface of the first member along the groove with a laser. Melt,
The welding method according to claim 1 or 2.
The width of the groove is larger than the width at which the first member and the second member are melted in the melting step.
The welding method according to any one of claims 1 to 3.
In the holding step, when the surface of the first member on which the groove is formed is brought into contact with the second member and held, the groove of the first member and the second member The formed space is a closed space,
The welding method according to any one of claims 1 to 4.
The melting points of the first member and the second member are higher than the boiling point of the coating layer.
The welding method according to any one of claims 1 to 5.
The first member in which the groove was formed and
A second member arranged in contact with the grooved surface of the first member, and
A welded portion formed in the portion where the groove is formed and joining the first member and the second member,
With
The coating layer is provided on at least one of the surface of the first member on which the groove is formed and the surface of the second member that comes into contact with the first member.
Plate-shaped member.
The welded portion includes a protruding portion protruding into the groove.
The plate-shaped member according to claim 7.
The width of the groove is larger than the width of the weld.
The plate-shaped member according to claim 7 or 8.
The melting points of the first member and the second member are higher than the boiling point of the coating layer.
The plate-shaped member according to any one of claims 7 to 9.
Elevator equipment including the plate-shaped member according to any one of claims 7 to 10.