JP2623650B2 - How to bathe a thin pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a method for welding a thin-walled pipe in which sealing members are brought into contact with both ends of a thin-walled pipe to seal the pipe, and the centering of the thin-walled pipe and the sealing member is simplified. It is a welding method for sealing the end face of a thin-walled pipe with the aim of performing highly reliable sealing welding in the atmosphere, and a thin-walled pipe having a predetermined inner diameter, and the pipe is press-fitted, and The tip is a fixed dimension smaller than the inner diameter of the pipe, and the base is a tapered base whose outer diameter is larger than the fixed dimension so that the tip of the press-fitted pipe warps outward.
A sealing member having a stepped surface formed concentrically with the base, wherein the tapered base of the sealing member is press-fitted into the pipe, and the stepped surface is brought into contact with an end surface of the pipe; At the same time, the press-fitted pipe is press-fitted into the sealing member with its tip warped outward, and a laser beam is sequentially applied to the outer periphery near the stepped surface, thereby forming a base for the sealing member and the pipe. The material is melt-welded and sealed.

[Industrial applications]

The present invention relates to a method for welding a thin pipe in which sealing members are brought into contact with both end faces of a thin pipe to seal the pipe.

Recently, various kinds of electric equipment have used various sealed containers using thin pipes for cooling electronic components and the like. The sealed containers are sealed by welding thin pipes and sealing members. Therefore, there is a need for a new method of welding a thin-walled pipe capable of forming a highly reliable hermetically sealed container by facilitating the operation of sealing welding, because the welding operation of the sealing member is difficult and quality improvement is difficult.

[Conventional technology]

Conventionally, a widely used method for welding a thin pipe is to form a pipe 1 made of metal having a flange 1-1 having a predetermined outer diameter at both ends of the thin pipe as shown in FIG. Flange 1-1 on one side of the disc
And a metal sealing member 2 provided with a cylindrical projection having a flange portion 2-1 having the same outer diameter as that of the metal. Then, the end surface of the flange portion 2-1 of the sealing member 2 is brought into close contact with the end surface of one of the flanges 1-1 provided on the pipe 1 using a special jig, and the outer periphery of the flange 1-1 coincides with the outer periphery of the flange portion 2-1. Perform centering so that In this state, the pipe 1 and the sealing member 2 are rotated to irradiate the outer periphery of the contact portion with the electron beam 3, and the energy is used to melt-weld both base materials in the entire outer periphery to seal one and seal the other. The sealed container is also formed by performing sealing welding on the flange 1-1 by the same welding method as described above. An electronic component that generates heat is attached to one end surface of one sealing member 2 of this sealed container, and a cooling liquid inflow pipe and a discharge pipe (not shown) are penetrated and welded to the other end surface to be used as a cooling device. ,
Seal welding that does not cause liquid leakage is required.

[Problems to be solved by the invention]

The problem with the conventional welding method described above is that a special jig for bringing the flange end face of the pipe into close contact with the flange end face of the sealing member is required, and a thin pipe made of a copper alloy or the like is sealed by welding. In addition, since it is difficult to center the pipe and the sealing member, there is a problem in that misalignment occurs between the outer periphery of the pipe flange and the outer periphery of the flange portion of the sealing member, resulting in poor welding.

Also, even if a dedicated jig is used, it is difficult to center the thin pipe and the sealing member, and it is difficult to rotate the sealing member in close contact with it. Irradiation causes a problem that the working efficiency deteriorates.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a new thin pipe welding method that can easily perform centering of a thin pipe and a sealing member and can perform highly reliable sealing welding in the atmosphere. And

[Means for solving the problem]

As shown in FIG. 1, the present invention comprises a pipe 11 in which a thin cylinder having a predetermined inner diameter is cut to an arbitrary length, and an outer surface slightly larger than the outer diameter of the pipe 11 on one side of a thick plate formed into an arbitrary shape. A cylindrical base having a diameter was formed, and a tapered portion 12-2 which was press-fitted to the extent that the inner diameter of the tip of the pipe 11 was expanded outward was provided concentrically with the cylindrical base and a stepped surface 12-1 was provided. A sealing member 12 is provided, and a tapered portion 12-2 is press-fitted so that a stepped surface 12-1 of the sealing member 12 abuts on an end surface of the pipe 11, and the sealing member 12 is fixed to both end surfaces of the pipe 11. By irradiating the center of the defocus portion of the laser beam 13 onto the outer periphery of the vicinity of the step surface 12-1 of the sealing member 12 and rotating the same, the sealing member 12
And the base material of the pipe 11 are sealed by fusion welding.

(Operation)

In the present invention, the sealing member 12 for sealing the end face of the pipe 11 is provided on the end face of the cylindrical base having an outer diameter slightly larger than that of the pipe 11, and a tapered part concentric with the cylindrical base and whose root can be pressed into the inner diameter of the pipe 11.
Since the stepped surface 12-1 is provided concentrically with the columnar base, the tapered portion 12-2 of the sealing member 12 is attached to the pipe 11.
And the step surface 12-1 of the end face of the pipe 11 and the sealing member 12
When the pipe 11 abuts, the inner diameter of the distal end of the pipe 11 is expanded outward, so that the tightness between the pipe and the sealing member is increased, and the state of close contact can be maintained before laser beam irradiation. Also, the outer periphery of the end face of the pipe 11 to be sealed and welded and the stepped surface of the sealing member 12 are formed.
Since the outer periphery of the 12-1 is automatically concentric, a dedicated jig for centering is not required, and the reliability of sealing can be improved by fusion welding of the base material by the laser beam 13.

When the taper portion 12-2 of the sealing member 12 is press-fitted into the pipe 11, the sealing member 12 is fixed to both end surfaces of the pipe 11, so that the assembly is performed in a pre-processing step and mounted on a welding jig. As a result, the sealing welding can be automated and the working efficiency can be improved.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and FIG.

FIG. 1 is a sectional view showing a method of welding a thin pipe according to the present embodiment, and FIG. 2 is an enlarged sectional view of a welded portion according to the present embodiment.
Reference numeral 2 denotes a sealing member for sealing both ends of the pipe.

As shown in FIG. 1, the pipe 11 is a pipe made of a metal obtained by cutting a thin cylinder having a predetermined inner diameter into an arbitrary length, such as a copper alloy.

The sealing member 12 has a cylindrical shape slightly larger than the outer diameter of the pipe 11 protruding from one side of a disk, for example, formed into an arbitrary size. 12-2 hollow taper part tapered in the direction
Are formed so as to be concentric with the cylinder, and the stepped surface 12-
1 made of a metal, for example, a copper alloy or the like.

In the method of welding a thin pipe using the above members, a tapered portion 12-2 formed on the sealing member 12 is inserted from one side of the pipe 11 so that the end face of the pipe 11 contacts the stepped surface 12-1 of the sealing member 12. Press-fit until it comes into contact with the other end, and press-fit the tapered portion 12-2 of the other sealing member 12 from the other end so that the other end surface of the pipe 11 abuts the stepped surface 12-1.
The sealing members 12 are connected and fixed to both ends of the device. Pipe in that state
11 and the sealing member 12, the defocus portion of the laser beam 13 is adjusted so that the center is located on the outer peripheral surface near the step surface 12-1 of the sealing member 12 as shown in the enlarged view of FIG. Irradiate,
A sealed container is formed by a method in which the sealing member 12, the outer periphery of the step surface 12-1 and the outer periphery of the end surface of the pipe 11 are melted and sealed and welded by the energy.

As a result, when the taper portion 12-2 of the sealing member 12 is press-fitted into the pipe 11, the sealing member 12 is fixed to both end surfaces of the pipe 11, and at the same time, the outer peripheral surface of the end surface of the pipe 11 and the stepped surface of the sealing member 12
The 12-1 outer periphery is automatically concentric with each other, so that the reliability of sealing welding can be improved, the welding can be automated, work efficiency can be improved, and an airtight function can be secured.

FIG. 3 shows another embodiment of the present invention. In the examples of FIGS. 1 and 2, welding is easier than in the prior art, but it is difficult to set welding conditions due to the large thickness ratio and poor heat balance during welding. ing. Further, the sealing member 12 is provided with a tapered portion 12-2 to reduce the gap generated in the overlapping portion. However, since the gap cannot be completely eliminated due to the accuracy of the sealing member 12, the welding quality is large. Affects.

Therefore, in addition to the member to be welded as shown in FIG. 3, a thin ring 14- having an inner diameter substantially equal to the outer diameter of the pipe 11 is used.
Use ring 14 at the overlap of pipe 11
-1 and 14-2 are inserted and brought into close contact, and the thickness ratio of the pipe 11 and the sealing member 12 is apparently reduced by the rings 14-1 and 14-2 to improve the heat balance at the time of welding. Thus, better weldability can be obtained, thereby widening the range of welding conditions and improving welding quality.

As described above, the present invention has been described based on the illustrated embodiments, but the present invention is not limited to only the embodiments of the above-described embodiments. For example, the sealing member may have a stepped surface and a tapered portion on one surface of a plate formed into an arbitrary shape. May be used, and in the case of a square pipe, sealing welding using a sealing member provided with a stepped surface and a tapered portion corresponding to the square pipe may be used.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, there is an advantage that the reliability of sealing welding can be improved and welding can be automated by an extremely simple method, and significant economical and reliability improving effects can be obtained. It is possible to provide a thin pipe welding method that can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a method of welding a thin pipe according to one embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a welded portion of the present embodiment, and FIG. 3 shows another embodiment of the present invention. FIG. 4 is a sectional view showing a conventional welding method. In the figure, 11 is a pipe, 12 is a sealing member, 12-1 is a stepped surface, 12-2 is a tapered portion, 13 is a laser beam, and 14-1 and 14-2 are rings.

Claims (2)

(57) [Claims] 1. A welding method for sealing an end face of a thin-walled pipe, comprising: a thin-walled pipe having a predetermined inner diameter; The base is provided with a tapered base having a larger outer diameter than the predetermined dimension so that the tip of the press-fitted pipe warps outward, and a sealing member having a stepped surface formed concentrically with the base. Press-fitting the tapered base of the sealing member into the pipe, and bringing the stepped surface into contact with the end face of the pipe;
The press-fitted pipe is in close contact with the sealing member with its tip warped outward, and by sequentially irradiating a laser beam to the outer periphery near the stepped surface, the base material of the sealing member and the pipe is removed. A method for welding thin-walled pipes, which is performed by melting and sealing. 2. A welding method for sealing an end face of a thin-walled pipe, comprising: a thin-walled pipe having a predetermined inner diameter; Small, the base is a tapered base having a larger outer diameter than the certain dimension so that the tip of the press-fitted pipe warps outward, and a sealing member having a stepped surface formed concentrically with the base, An inner diameter is provided with a ring substantially equal to the outer diameter of the pipe, the tapered base of the sealing member is press-fitted into the pipe, and the stepped surface is brought into contact with the end face of the pipe,
The press-fitted pipe is in close contact with the sealing member in a state where the tip is warped outward, and furthermore, after the pipe is overlapped with the overlapped portion of the tapered base, the ring is overlapped with the pipe. A method for welding a thin pipe, comprising: irradiating a laser beam sequentially to the vicinity of the periphery to melt-weld the sealing member and a base material of the pipe to seal the pipe.