JPH07303965A - Circumference welding equipment - Google Patents

Abstract

PURPOSE:To complete gas shield and to eliminate welding defect even if the projecting size of a cylindrical member is long against a base stock. CONSTITUTION:A cylindrical chamber 10 is attached freely rotatably to a positioning member 5. A torch 7 and a welding electrode 8 are inserted and arranged in the chamber 10. The positioning member 5 is inserted into the cylindrical welding member projecting from a base stock, and the welding member is covered with the chamber 10. A shield gas is ejected from a hole at the tip end of a pipe 16 at the time of welding, and the circumference welding is performed in the atmosphere of the shield gas inside the chamber 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circumferential welding machine.

[0002]

2. Description of the Related Art In a conventional circumferential welding machine of this type, for example, when a cylindrical member is circumferentially welded to a plate-shaped base material,
A torch formed integrally with the head is rotated around a cylindrical member to perform welding. In this case, the positioning member provided at the tip of the rotary shaft provided in the axial direction of the head so as to freely rotate is inserted into the cylindrical member, and the torch is rotated together with the rotary shaft to perform welding. There is.

[0003]

When the dimension of the protruding portion of the cylindrical member is short with respect to the plate-shaped base material, the welding electrode from the torch reaches the welding site, and the shield gas from the torch is reached. Also, it is possible to perform circumferential welding while ejecting it to the welding site to shield the gas. However, if the protruding portion of the cylindrical member is longer than the plate-shaped base metal, even if only the welding electrode is extended to the welding site side, the shielding gas from the torch does not shield the welding site. However, there is a problem that the gas shield becomes incomplete and welding failure occurs.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and its object is to complete the gas shield even when the projecting dimension of the cylindrical member is long with respect to the base material. An object of the present invention is to provide a circumferential welding machine that eliminates defective welding.

[0005]

Therefore, in the circumferential welding machine according to the first aspect of the present invention, there is provided a positioning member 5 rotatably provided at the tip of a rotary shaft 3 provided in the axial direction of the head 1, and the rotary shaft. Three
Together with the torch 7 rotating around the positioning member 5
And a cylindrical gas shield chamber 10 provided on the positioning member 5 so as to be freely rotatable with the tip end side of the positioning member 5 as an opening surface, and a hole 13 on the side opposite to the opening surface of the chamber 10. It has a welding electrode 8 whose tip side is inserted and arranged in the chamber 10, and shield gas ejecting means 16, 17, 18 for ejecting a shield gas to the welding site which is provided in the chamber 10.

Further, in the circumferential welding machine according to a second aspect of the present invention, the pipe 16 in which the shield gas jetting means 16, 17, 18 is inserted and arranged in the chamber 10 is formed in a substantially ring shape, and the bent portion 17 is formed. Holes for ejecting multiple shield gases 1
It is characterized in that it is configured by drilling 8.

Further, in the circumferential welding machine according to a third aspect of the present invention, the shield gas jetting means is provided in the bottom portion 15 of the chamber 10 and one end thereof is supplied with a shield gas from the outside.
2, a guide groove 21 that guides the shield gas supplied from the supply hole 22 in the circumferential direction of the chamber 10, and the supply hole 22 that is drilled along the shape of the guide groove 21.
Orifice plate 24 having a plurality of ejection holes 25 _{1 to} 25 ₇ whose diameters are increased from a position near to
And the ejection holes 25 _{1 to} 25 of the orifice plate 24.
_At least 1 to diffuse the shield gas ejected from _7.
It is characterized in that it is composed of one or more mesh-shaped filters 26.

[0008]

In the circumferential welding machine according to the first aspect of the present invention, the welding portion can be surrounded by the chamber 10 even if the welding member has a long protruding dimension with respect to the base metal, and the shield gas is jetted into the chamber 10. With this, welding can be performed in an atmosphere of shield gas. Moreover, since the chamber 10 is attached to the positioning member 5 in a freely rotatable manner,
Even if the torch 7 rotates, the chamber 10 rotates together with the torch 7, and smooth circumferential welding can be performed.

Further, in the circumferential welding machine of claim 2, the pipe 1
The shield gas is ejected from the plurality of holes 18 formed in the bent portion 17 formed in the substantially ring shape of 6, and the shield gas can be diffused in the chamber 10 to perform a more complete shield. It is possible to eliminate welding defects when performing circumferential welding.

Further, in the circumferential welding machine of the third aspect, the shield gas guided by the guide groove 21 of the chamber 10 is ejected from an orifice plate 24 having a plurality of holes perforated from a portion near the supply hole 22 of the chamber 10 to a portion far therefrom. It will be uniformly diffused by 25 _{1 to} 25 ₇ .
Further, the ejection holes 25 _{1 to} 25 _{7 of the} orifice plate 24
The shield gas uniformly diffused by the filter is further uniformly diffused by the mesh filter 26. As a result, the shield gas in the chamber 10 can be uniformly diffused, the shield effect can be improved, and welding defects can be eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the circumferential welding machine of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an enlarged cross-sectional view of the tip portion of the head 1 of the circumferential welding machine.
Shows a front view of the head 1. Inside the main body casing 2 of the head 1, there is provided a rotary shaft 3 which is rotationally driven by a motor, a gear or the like (not shown), and the tip end side of the rotary shaft 3 has a relatively long dimension through a bearing 4. The positioning member 5 is mounted so as to be freely rotatable. The rotating shaft 3
A torch 7 is provided at the tip of the through a fixture 6.
The torch 7 also rotates as the rotating shaft 3 rotates. A welding electrode 8 made of, for example, a tungsten electrode is provided at the center of the torch 7, and the welding electrode 8 is connected via a power cable 9 from a power source section.

A chamber 10 having an open end is attached to the positioning member 5 in a freely rotatable manner. The chamber 10 is formed in a cylindrical shape as shown in FIG. 3, and has a mounting portion 11 having a small diameter on the base side.
The positioning member 5 is inserted into the insertion hole 12 so that the chamber 10 can be attached to the positioning member 5 in a freely rotatable manner. A hole 13 into which the torch 7 is inserted is formed from the bottom 15 to the side of the chamber 10, and a hole 14 into which a filler wire is inserted is formed on the side of the hole 13.
Also, through the hole in the bottom 15 of the chamber 10, the pipe 16
Of the pipe 16 is projected to the head 1 side, and a bent portion 17 is formed at the tip of the pipe 16 in a substantially C-shape. A part of the bent portion 17 and the inner surface of the chamber 10 are joined and fixed. On the surface of the bent portion 17 at the tip of the pipe 16, that is, on the same surface as the opening surface side of the chamber 10, a plurality of holes 18 for ejecting the shield gas are formed in the circumferential direction. The holes 18 are formed at intervals of 30 °, for example, and 7 to 8 holes are formed. A gas hose 19 is connected to the base of the pipe 16 as shown in FIG.

FIG. 1 shows a state in which the chamber 10 is mounted on the positioning member 5 of the head 1, and the hole 1 of the chamber 10 is shown.
The tip portion of the torch 7 is inserted into the torch 7, and the welding electrode 8 of the torch 7 is located near the opening surface side of the chamber 10.
When the positioning member 5 is inserted into the hole of the cylindrical member that projects longer than the plate-shaped base material, the opening surface of the chamber 10 is located up to the vicinity of the welding site between the plate-shaped base material and the cylindrical member, The chamber 10 covers the vicinity of the welded portion. Then, by rotating the rotating shaft 3, the torch 7 is rotated around a cylindrical shape. With this, the welding electrode 8 and the chamber 10 are rotated, and welding (for example, TIG welding) is performed by an arc between the welding electrode 8 and the base material. At this time, the bent portion 1 of the pipe 16 is in the chamber 10.
The shield gas is ejected from the hole 18 of the No. 7 and is shielded from the surrounding air by the shield gas, and circumferential welding can be performed without causing welding defects in the atmosphere of the shield gas.

The length of the chamber 10 in the axial direction is arbitrary, and by preparing a plurality of types of chambers 10 according to the protruding size of the cylindrical member to be welded to the plate-shaped base material, the cylindrical shape can be obtained. This can be dealt with according to the length of the protruding dimension of the member.

(Embodiment 2) Next, an embodiment of another chamber 10 will be described with reference to FIGS. As shown in FIG. 6, the chamber 10 in this embodiment is shown to be short in the axial direction, and the mounting portion 11 is formed with a hole 12 into which the positioning member 5 is inserted as in the previous embodiment. A substantially C-shaped guide groove 21 is provided on the end surface on the opening side of the bottom portion 15 of the chamber 10, and one end of this guide groove 21 is inserted into the guide groove 21 via a gas hose from the outside. A supply hole 22 for supplying the shield gas is bored. Reference numeral 23 is a hole into which the torch 7 is inserted.

An orifice plate 24 as shown in FIG. 7 is arranged on the front surface of the guide groove 21 of the chamber 10. The thin orifice plate 24 has a shape of the guide groove 21. Corresponding to
It is shaped like a letter. And the orifice plate 24
A plurality of ejection holes 25 (25 _{1 to} 25 ₇ in this embodiment) are formed in the circumferential direction along the guide groove 21. Here injection holes 25 ₁ at one end is positioned to correspond to the supply holes 22 of the guide groove 21, the nozzle 25 ₇ at the other end has a farthest position from the supply hole 22.
The ejection hole 25 ₁ closest to the supply hole 22 has the smallest diameter, and the ejection holes 25 ₂ , 25 ₃ ...
5 ₇ a larger bore diameter toward the hole diameter of the injection holes 25 ₇ are the greatest. This allows the orifice plate 24
The shield gas ejected from the ejection holes 25 (25 _{1 to} 25 ₇ ) of _{No. 1} is uniformly diffused.

On the front surface of the orifice plate 24,
A mesh-shaped filter 26 as shown in FIG. 8 is arranged, and this filter 26 is also formed in a substantially C shape. In this embodiment, the filter 26 is set to 10
The number is used, but the number is not limited. By using a plurality of these filters 26, it is possible to diffuse the shield gas ejected from the ejection holes 25 of the orifice plate 24 more finely and uniformly.

The orifice plate 24 and the filter 2
6 and the like are fixed to the chamber 10 by a filter retainer 27 as shown in FIG. The filter holder 27 is formed in a substantially disc-shaped shape as shown in the drawing, and a substantially C-shaped hole 28 is formed inside the filter holder 27 so as to correspond to the ejection hole 25 of the orifice plate 24. Three screw insertion holes 29 are formed around the filter holder 27, and the screws 30 are inserted into the screw insertion holes 29 as shown in FIG. 4 and screwed into the screw holes 31 of the chamber 10. The filter holder 27 is fastened and fixed to the chamber 10 together with the orifice plate 24 and the filter 26. Further, in FIG. 5, 32 is an extension joint and 33 is a chamber joint. Note that the function of the chamber 10 is the same as that of the previous embodiment, and the description thereof is omitted.

[0019]

As described above, in the circumferential welding machine according to the first aspect of the present invention, even if the protruding dimension of the welding member is long with respect to the base metal, the welding site can be surrounded by the chamber, and the shield gas can be enclosed in the chamber. By jetting, welding can be performed in a shield gas atmosphere. Moreover, since the chamber is attached to the positioning member in a freely rotatable manner, even if the torch rotates, the chamber rotates together with the torch, and smooth circumferential welding can be performed.

In the circumferential welding machine according to the second aspect of the invention, the shield gas is ejected from a plurality of holes formed in the bent portion of the pipe formed in a substantially ring shape, and the shield gas is diffused into the chamber. You can do it, you can do a more complete shield,
It is possible to eliminate welding defects when performing circumferential welding.

Further, in the circumferential welding machine according to the third aspect of the invention, the shield gas guided by the guide groove of the chamber is uniformly diffused by the ejection holes of the orifice plate having a plurality of holes from the portion near the supply hole of the chamber to the portion far therefrom. Will be. Further, the shield gas uniformly diffused by the ejection holes of the orifice plate is further uniformly diffused by the mesh filter. As a result, the shield gas in the chamber can be diffused uniformly, the shield effect can be improved, and welding defects can be eliminated.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part on a tip side of a head according to an embodiment of the present invention.

FIG. 2 is a front view of the head according to the embodiment of the present invention.

3A and 3B are a sectional view and a rear view of a chamber according to an embodiment of the present invention.

4 (a) and 4 (b) are a front view and a sectional view of a chamber with a filter and the like according to a second embodiment of the present invention attached thereto.

FIG. 5 is a side view of the chamber according to the second embodiment of the present invention.

6A and 6B are a front view and a sectional view of a chamber according to a second embodiment of the present invention.

7 (a) and 7 (b) are a front view and a sectional view of an orifice plate according to a second embodiment of the present invention.

FIG. 8 is a front view of the filter according to the second embodiment of the present invention.

9A and 9B are a front view and a sectional view of a filter holder according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 head 3 rotating shaft 5 positioning member 7 torch 8 welding electrode 10 chamber 13 hole 15 bottomed part 16 pipe 17 bent part 18 hole 21 guide groove 22 supply hole 24 orifice plate 25 jet hole 26 filter

Claims (3)

[Claims] 1. A positioning member (5) rotatably provided at the tip of a rotary shaft (3) provided in the axial direction of the head (1), and the positioning member (5) together with the rotary shaft (3). 5) A torch (7) which rotates around 5), and a cylindrical gas shield chamber (10) which is rotatably provided on the positioning member (5) with the tip side of the positioning member (5) as an opening surface. ) And a chamber (10) with the tip side through a hole (13) opposite to the opening surface of the chamber (10).
It is characterized by having a welding electrode (8) inserted and arranged therein, and a shield gas ejecting means (16) (17) (18) provided in the chamber (10) for ejecting a shield gas to a welding site. Circumferential welding machine. 2. The shield gas jetting means (16) (1)
7) (18), a pipe (16) inserted and arranged in the chamber (10) is formed in a substantially ring shape, and a plurality of holes (18) for ejecting a plurality of shield gases are formed in the bent portion (17).
The circumferential welding machine according to claim 1, wherein the circumferential welding machine is configured by boring. 3. The shield gas jetting means is provided at the bottom (15) of the chamber (10) and has a supply hole (22) at one end for supplying a shield gas from the outside, and is supplied from the supply hole (22). The shield gas that has been
0) a guide groove (21) for guiding in the circumferential direction, and the supply hole (2) formed by drilling along the shape of the guide groove (21).
An orifice plate having a plurality of ejection holes and large diameter enough leading away from the closest point to 2) ₍₂₅ 1 to 25 ₇₎ (24), injection holes ₍₂₅ 1 to 25 ₇ of the orifice plate (24) ) At least one mesh-shaped filter (2) that diffuses the shielding gas ejected from
6) The circumferential welding machine according to claim 1, characterized in that