JPH0113954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of fusion welding a hollow metal cylinder, such as a pipe material or a nut, to a metal plate with a brazing material using arc heat.

Conventionally, one method of fixing various parts to each other has been to fix nuts, pipes, etc. to thin metal plates, but in such cases,
Means such as welding or brazing are often used. Fillet tuck welding is generally used for welding, but this causes warping of the metal plate due to welding distortion, which requires a post-process to remove the distortion. Another possible welding method is arc stud welding, but in this method the relationship between the diameter D of the stud and the thickness t of the metal plate is t even if a backing metal (chill metal) of the metal plate is used. = D/5, so the applicable range is extremely small, and hollow objects such as nuts cannot be welded as they are, making the pre-welding process very troublesome.

Therefore, brazing is the most commonly used method for fixing nuts, pipes, etc. to thin metal plates, but conventionally brazing requires large equipment because it involves putting the process in a furnace or heating the entire process. In addition to this, there are many other drawbacks, such as material changes caused by heating the entire body. There is also brazing using high-frequency heating, but this method has the drawback that it requires a large amount of heat and takes a lot of time, and also causes distortion.

This invention was made in order to solve the above-mentioned conventional drawbacks, and includes a metal plate that is a base material for welding, and a metal cylinder to be joined to the metal plate, which is formed in a ring shape along the end surface of the brazing filler metal. At the same time, the metallic cylindrical body is surrounded by a ferrule in this abutting part, and a brazing metal is welded and bonded by arc heating, thereby causing distortion in the metal plate. First, it is an attempt to braze a metal cylindrical body such as a nut to a metal plate in an extremely short time using a simple device and operation.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 4 show an embodiment in which a stud pipe is used as the metal cylindrical body in the fusion welding method of the present invention, and the stud pipe 1 is composed of a simple pipe. Both ends are open. This stud pipe 1 is connected to a metal plate 2 which is formed considerably thinner than the diameter of the stud pipe 1.
The brazing material 3 is used for this purpose. The material of the brazing filler metal 3 is not particularly limited, but 7-3 brass is usually preferred. Then, the brazing material 3 is formed into a ring shape so as to be able to follow the lower end surface of the stud pipe 1 using the wire rod. Further, a ferrule 4 is prepared to surround the stud pipe 1 at the bonding point, and this ferrule 4 is provided with exhaust holes 4a, 4a as is well known.

When bonding the stud pipe 1, the upper end of the stud pipe 1 is inserted into a stud gun, and a ring-shaped brazing material 3 is placed on the metal plate 2. The lower end of the stud pipe 1 is inserted into a ferrule 4 placed on a metal plate 2 as shown in FIG. 2, and is pressed against the metal plate 2 through a ring-shaped brazing material 3. In this state, as shown in Fig. 3, when the stud pipe 1 is pulled up several mm and at the same time a current of, for example, 800 [A] is applied for 0.2 seconds,
A welding arc flies between the stud pipe 1 and the filler metal 3, and the filler metal 3 melts. In this state, when the stud pipe 1 is pressed against the metal plate 2 and the current flowing through the stud pipe 1 is cut off at the same time or around a fraction of a second, the stud pipe 1 is bonded to the metal plate by the brazing material 3, as shown in Fig. 4. It will be glued to board 2.

Next, FIGS. 5 to 7 show an embodiment in which a nut is used as the metal cylindrical body, and in this case, a nut holder 6 is used as a means for attaching the nut to the stud gun. The nut holder 6 is a rod-shaped body that can be inserted into a stud gun, and the lower end thereof is provided with a male threaded portion 6a that can be screwed into the female thread 5a of the nut 5.
It will be screwed on and inserted into the stud gun. In this case, the ferrule 4 needs to be inserted into the nut holder 6 before the nut 5 is screwed on. The nut gluing work is the same as in the above embodiment, and after gluing the nut, the ferrule 4 is
If the nut holder 6 is unscrewed after being crushed and removed, the state shown in FIG. 7 will be obtained. In this case, since the brazing material 3 is also slightly fused to the threaded portion 5a of the nut 5, the bonding strength is increased accordingly.

This invention provides a hollow portion of a metal cylindrical body to be bonded to the metal plate 2, such as a threaded portion 5 of a nut 5.
Adhesion is also possible when a hole communicating with a is provided. In this case, the ring-shaped brazing material 3 may be placed along the edge of the hole 2a of the metal plate 2 as shown in FIG.
In order to improve communication between the hole 2a and the threaded part 5a of the nut, the diameter of the hole 2a of the metal plate 2 should be set slightly larger than the diameter of the threaded part 5a of the nut, as shown in FIG. It is best to form it with a large diameter.
In addition, if another member is screwed onto the nut from below the metal plate 2, it would be inconvenient if the brazing material 3 were fused to the threaded part 2a of the nut. , as shown in FIG.
If the ring-shaped brazing filler metal 3 is made to protrude and the bonding operation is performed with the ring-shaped brazing filler metal 3 touching the outside of the cylindrical body 5b, the molten brazing filler metal 3 will stick to the cylindrical body 5b as shown in FIG. This means that the nut 5 can be screwed onto the metal plate 2 from either the top or the bottom of the metal plate 2 without entering the threaded portion 5a.

As explained above, in bonding a metal cylindrical body to a thin metal plate, the present invention uses a ring-shaped brazing filler metal along the end surface of the metal cylindrical body as a bonding brazing filler metal. The metal cylindrical body is brought into contact with the metal plate through the brazing material, the metal cylindrical body is surrounded by a ferrule at this contact area, and bonding is performed using arc heating, which eliminates the need for conventional arc stud welding equipment. Therefore, the gluing equipment is simple, the gluing work is easy and can be done in a short time, and the heating temperature can be lowered, so it is suitable for bonding thin metal plates. On the other hand, it has many excellent effects, such as no distortion occurring in the metal plate, no post-process for removing distortion, being economical, and significantly improving workability.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a partially cutaway side sectional view showing the arrangement of materials used for bonding, and Figure 2 is a state before the start of bonding. 3 is a side sectional view of a state in which molten arc is generated, and FIG. 4 is a side sectional view of a state in which bonding is completed.
Fig. 5 is a side view showing the member when a nut is used on the metal cylindrical body, Fig. 6 is a side cross-sectional view of the member before the start of adhesion when the nut is used, and Fig. 7 is a side view of the member in the state where the same adhesion is completed. Fig. 8 is a side sectional view of the metal plate with a hole before the start of adhesion, Fig. 9 is a side sectional view of the same after the adhesion is completed, and Fig. 10 is a small diameter short cylinder attached to the nut. FIG. 11 is a side sectional view of the state before the start of adhesion, and FIG. 11 is a side sectional view of the state where the adhesion is completed. 1...Studded pipe, 2...Metal plate, 2a...
...hole, 3...brazing metal, 4...ferrule, 5...
Nut, 5a...threaded part, 6... nut holding part.

Claims (1)

[Scope of Claims] 1. A hollow metal cylindrical body to be joined to the surface of the metal plate is brought into contact with a ring-shaped brazing material along the end face thereof, and the above-mentioned A method for brazing and fusion welding a metal plate and a metal cylindrical body, which is characterized by surrounding the metal cylindrical body with a ferrule and melting and bonding a brazing material by arc heating. 2. The method according to claim 1, wherein the metal cylindrical body is a nut. 3. The metal plate is characterized in that it has a hole that communicates with the hollow part of the metal cylindrical body. A method according to claims 1 and 2. 4. Claim 3, characterized in that a short cylindrical body with a small diameter is formed protruding from the lower end of the metal cylindrical body and surrounds the hollow part thereof, and a ring-shaped brazing material is arranged on the outside of the cylindrical body. Method described.