JPH07102472B2 - Airtight welding method for ultra-thin member and vacuum joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for airtightly welding an ultrathin material member and a vacuum joint, which are mainly applied to manufacture of vacuum equipment parts.

(Prior Art) Conventionally, as a vacuum device, for example, a component of an atomic absorption monitor,
A pipe-shaped ultra-thin member having a thickness of 0.17 mm and a diameter of 3/8 inch is joined to a vacuum joint. In this case, the ultra-thin member melts down by welding. A cylindrical thick connecting member b is inserted inside the ultra-thin material member a, and these members a and b are first preheated by the flame of the acetylene gas burner and brazed in the atmosphere, and then the connecting member b and the vacuum are connected. The joint c and the joint c are continuously welded by a taig welding, or the tip of the ultra-thin member a is inserted into the vacuum joint c having a plate thickness as shown in the second drawing, and a cylinder d is provided inside thereof to form a fillet joint. Generally, two points e and f are joined by I-type welding at the same time by taig welding. In the case of the second illustration, a U groove h is formed on the periphery of the insertion hole g of the ultra thin object member a of the vacuum joint c in order to facilitate the joining with the ultra thin object member a.

(Problems to be Solved by the Invention) As shown in FIG. 1, when the connecting member b is inserted into the ultra-thin material member a and the joint is brazed in the atmosphere, the ultra-thin material member a is surface-oxidized by the flame of the acetylene gas burner. The braze does not flow evenly, and when the connecting member b and the vacuum joint c are Teg-welded, the brazing of the brazing joint melts due to the influence of the welding heat, and a defective joint tends to occur. This portion is not preferable because it impairs the airtightness of the vacuum equipment.

Further, in the case of the second illustration, when the fillet joints e and f are taig-welded, the ultra-thin material member a is melted and blown away by the arc heat, and uniform joining cannot be performed, and the airtightness is deteriorated as in the case described above. There is a drawback that such defective joints are likely to occur.

An object of the present invention is to solve these drawbacks and the like, and to weld an ultrathin material member to a vacuum joint with good airtightness and at a low cost.

(Means for Solving Problems) In the present invention, one end of a connecting member thicker than this is superposed on one side surface of an ultrathin member to continuously weld a joint between these members, and the other end of the connecting member is connected. In which the side is continuously welded to a vacuum joint, the other side surface of the ultra-thin material member has a welding margin on the end side thereof, and a contact member thicker than the ultra-thin material member is polymerized, and The above-mentioned problem is solved by superposing the connecting member and the connecting member on each other through the intermediate ultra-thin material member and simultaneously continuously welding the connecting member and the contact member to the welding margin.

(Operation) When the ultra-thin material member to be welded is a pipe-shaped member, a tubular connecting member that is thicker than the member is inserted into the inner surface of the member to polymerize it, and the outer surface of the member is thick. A tubular pad member is fitted to the end portion side of the ultra-thin material member so that a welding margin is left, and the connecting member and the pad member are overlapped with each other via the ultra-thin material member. Then, with respect to the welding allowance, the welding member and the abutting member are continuously welded at the same time by stabilizing the arc of the TIG welding machine and melting the filler material. During this welding, the arc heat is absorbed by the connecting member and the contact member, so that the ultrathin material member is not melted and the welding can be performed with good airtightness. Next, the connecting member is continuously welded to the vacuum joint by TIG welding similarly to complete the joining of the ultra-thin material member and the vacuum joint, but the vacuum joint does not require the processing of the U-groove and can be inexpensively joined. It

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows an example of manufacturing vacuum equipment parts of an atomic absorption monitor, in which a pipe-shaped ultra-thin member (1) is attached to a vacuum joint (2). The case of joining is shown. When the ultra-thin member (1) has a thickness of 0.17 mm and a diameter of 3/8 inch, the inside of the member (1) has a length of 30 mm as shown in FIG. The outer diameter is 9.24 mm, and the other end side (3b) length is 10 mm. The outer diameter is made thick to 9.52 mm to facilitate joining with various sizes of vacuum joints (2), and the penetrated diameter is 7.2 mm. The connecting member (3) having the through hole (3c) is inserted from the one end side (3a).

Also, on the outside of the member (1), a length of 10 m as shown in FIG.
A patch member (4) having m, an outer diameter of 11.6 mm, and an inner diameter of 9.60 mm is fitted to the end of the member (1) with a welding margin (5).

One end side (3a) of the welding member (3) is inserted into the member (1) by 5 mm to be polymerized with each other, and the member (4) is connected to the connecting member (3) through the member (1). It has a 4 mm overlapping portion (6) and is overlapped so that a 1 mm welding margin (5) remains.

In this state, the filler material is melted by a take welder with a stable arc, and the connecting member (3) and the contact member (5) are joined to the welding margin (5) at the joints (7) and (8). At the same time, fillet welding is performed. The arc heat applied to the joint portions (7) and (8) is absorbed by the thick connecting member (3) and the contact member (4) provided on both surfaces of the ultrathin member (1), and thus the ultrathin member (1). ) Can be used as a homogeneous and airtight solution without melting.

Next, the vacuum joint (2) is connected to the other end side (3) of the connecting member (3).
It is fitted in b), and the joint (9) is I
Shape welding is performed. In this case, since the connecting member (3) is relatively thick, the vacuum joint (2) is uniformly welded with good airtightness by Teg welding without special processing such as U groove. I can do it.

FIG. 6 shows an example of manufacturing vacuum equipment parts constituting a gas flow path and a water flow path. When the ultrathin member (1) has a thickness of 0.17 mm and a diameter of 1/4 inch, the connecting member (3) Is 30mm long
The outer diameter of one end side (3a) is 6.04 mm, and the other end side (3b) is 10 mm
Outer diameter of 6.35mm over the length of the, through hole with a diameter of 4.00mm (3c)
Are used.

Also, the padding member (4) has a length of 10 mm, an outer diameter of 8.4 mm, and an inner diameter of
6.40 mm is used, the connection member (3) and the contact member (4) are inserted into the inside and outside of the ultra-thin member (1) as shown in FIG. 6, and the joints (7) and (8) are simultaneously formed. Joining part (9) between the vacuum joint (2) and the connecting member (3) after the Teg welding.
Tage welding is applied. Also in this case, the ultra-thin member (1)
Does not melt due to arc heat, and each joint (7)
It was possible to weld (8) and (9) uniformly and with good airtightness.

(Effect of the invention) As described above, according to the present invention, the connecting member and the contact member are superposed on one side surface and the other side surface of the ultra-thin object member, and the corresponding member is left with a welding allowance on the end side of the ultra-thin object member. Since it is provided so as to overlap with the connecting member, and the connecting member and the abutting member are continuously welded to the welding allowance at the same time, arc heat is absorbed by the connecting member and the abutting member, and the ultrathin material member is melted by the arc. Since there is no need to perform special processing on the vacuum joint, the cost is low, welding with good airtightness can be performed, and productivity can be improved.

[Brief description of drawings]

1 and 2 are sectional side views of a conventional example, FIG. 3 is a sectional side view of an embodiment of the present invention, FIGS. 4 and 5 are sectional views of a connecting member and a patch member, and FIG. It is a sectional view of another example of the present invention. (1) ... Ultra-thin material, (2) ... Vacuum joint (3) ... Connecting member, (3a) ... One end side (4) ... Abutting member, (5) ... Welding allowance

Claims (1)

[Claims] 1. An ultra-thin member having one side surface superposed on one end side of a connecting member thicker than that to continuously weld a joint between these members, and the other end side of the connecting member to a continuous vacuum welding. In this case, the other side surface of the ultra-thin material member has a welding margin on the end side thereof, and a contact member thicker than the ultra-thin material member is superposed, and the corresponding member and the connecting member are intermediate poles. An airtight welding method for an ultra-thin member and a vacuum joint, characterized in that the connecting member and the abutting member are continuously welded at the same time with respect to the welding allowance by overlapping each other via a thin member.