JP3776180B2 - Internal gas shield jig for pipe welding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inner surface gas shield jig for pipe welding used to enclose an inert gas such as argon gas before welding in order to prevent oxidation of an inner surface which occurs during welding of a pipe and a sleeve or a pipe and a pipe.
[0002]
[Prior art]
Conventionally, a type using a shield rubber 20 as shown in FIG. 4 is known.
However, since this type is supported on the inner surface of the pipe by the elasticity of the shield rubber 20, there is a defect that the shield rubber is easily deteriorated by heat and needs to be replaced relatively frequently.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to provide a new inner surface gas shielding jig for pipe welding that solves the above-mentioned defects.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the inner gas shielding jig for pipe welding according to the present invention is filled with inert gas such as argon gas before welding to prevent oxidation of the inner surface that occurs when welding the pipe and the sleeve or the pipe and the pipe. An inner gas shield jig for pipe welding used for the above-mentioned, having a lid body 2 having a through hole 1 in the center and a hook-like hook-like portion 3 such as a spanner at the outer end, outwardly to the through hole 1 A male screw 5 inserted into the outer surface of the cut edge 4 of the through-hole 1 so as to lock the flange 3 and a coupler mounting hole provided in the center of the male screw 5 so as to communicate with the inside and outside 6, a coupler 9 that is attached to the coupler mounting hole 6 with a coupler mounting screw 8 having a gas inlet hole 7, a cone member 10 that is screwed into the inner end of the male screw 5, and an outer periphery of the cone member 10. Made of heat-resistant material such as metal with spring 11 A mold clamping shield member 12 and is characterized in that it consists of.
[0005]
[Action]
When, for example, the sleeve 16 is welded 17 to one end of the pipe 15 using the pipe welding inner surface gas shield jig according to the present invention, the male screw 5 is turned by using a tool such as a spanner to attach the cone member 10 to the lid 2. The tightening member 12 is attached by pressing the fastening member 12 in the radial direction against the acting force of the spring 11 and pressing the fastening member 12 against the inner peripheral surface of the sleeve 16. When removing, the male screw 5 may be turned in the opposite direction to eliminate the pressure contact.
[0006]
When an inert gas such as argon gas, helium gas, or nitrogen gas is fed through the hose 13 connected to the coupler 9 in the above-described mounting state, an inner surface plug jig (not shown) is inserted into the other end of the pipe 15. Is inserted and the other end is closed.
[0007]
【The invention's effect】
Since the inner surface gas shield jig for pipe welding according to the present invention has the above-described configuration, the shield member 12 is brought into pressure contact with the inner peripheral surface of the sleeve or the pipe by moving the male screw 5 back and forth with a tool such as a spanner. It is possible to eliminate the shield or the shield by eliminating the pressure contact, and there is no fear of thermal degradation like the shield rubber 20 in the above-described conventional example. Can be sufficiently eliminated.
[0008]
【Example】
The embodiment of the present invention shown in FIGS. 1 to 3 is an inner gas for pipe welding used to enclose argon gas or the like before welding in order to prevent oxidation of the inner surface that occurs during welding of the pipe 15 and the sleeve 16. The shield jig is related to a cloth-made bakelite lid 2 having a through-hole 1 in the center, and a spanner-hanging hook-shaped portion 3 at the outer end, and is inserted into the through-hole 1 from the outside. A bakelite male screw 5 made of cloth that is adapted to lock the flange 3 on the outer surface of the cut edge 4 of the hole 1, and a coupler mounting hole 6 provided in the center of the male screw 5 so as to communicate with the inside and outside. A metal coupler 9 attached with a coupler mounting metal screw 8 with a gas inlet hole 7 to the coupler mounting hole 6, a metal cone member 10 screwed into the inner end of the male screw 5, and a cone member Metal 4-split type with 10 attached to the outer periphery of 10 Be comprised of a biasing shield member 12, reference numeral 14 denotes a washer.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention in a tightening state of a tightening shield member.
FIG. 2 is a cross-sectional view showing a state in which the tightening is similarly loosened.
FIG. 3 is an exploded perspective view of the same.
FIG. 4 is a cross-sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Through-hole 2 Cover body 3 Cage-like part 4 Cutting edge part 5 Male screw 6 Coupler attachment hole 7 Gas feed hole 8 Coupler attachment screw 9 Coupler 10 Cone member 11 Spring 12 Tightening shield member 13 Hose 14 Washer 15 Pipe 16 Sleeve 20 Shield rubber

Claims (1)

An internal gas shield jig for pipe welding used to seal inert gas such as argon gas before welding to prevent oxidation of the inner surface that occurs during welding of a pipe and sleeve or pipe and pipe. A lid 2 having a hole 1 and a hook-like hook-like part 3 such as a spanner at the outer end, and a hook-like part 3 on the outer surface of the cut edge 4 of the through-hole 1 inserted from the outside into the through-hole 1. , A coupler mounting hole 6 provided in the center of the male screw 5 so as to communicate with the inside and outside, and a coupler mounting screw 8 having a gas inlet hole 7 in the coupler mounting hole 6. A coupler 9 attached thereto, a cone member 10 screwed into the inner end of the male screw 5, and a split-type clamping shield member 12 made of a heat resistant material such as metal and attached to the outer periphery of the cone member 10 with a spring 11. Internal gas for pipe welding characterized by comprising Rudo jig.

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