JPH0451025Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention prevents oxidation of the rod-shaped member and the inner surface of the side plate when welding a rod-shaped member such as a reinforcing pin inside a titanium box-shaped structure. This invention relates to a backshield device for welding rod-shaped members.

[Prior Art] When welding titanium parts, it is necessary to shield parts exposed to high temperatures, such as the weld area and its surroundings, and the back side of the weld bead, with argon gas, helium gas, etc. to prevent titanium from being oxidized by the atmosphere. Must be. Examples of jigs and devices for after-shielding welded parts and their surroundings include "Welding Handbook," pages 1081-1082 (editor: Welding Society of Japan, 4th edition, April 20, 1985, published by Maruzen Co., Ltd.) ) are listed. Further, for a simple part such as the back side of a weld bead, the back shield device can be constructed relatively easily. However, when many reinforcing pins are welded inside a titanium box structure 10 with a complicated shape as shown in FIG. 7, for example, it is not easy to backshield due to the narrow space. . For example, the seventh
When welding the reinforcing pin at part A in figure a,
Only the inlet end 11 of section A and the outlet end 14 of section D opposite thereto are opened, and the other sections B, C, E, and F are opened.
The open ends 12, 13, 15, and 16 of the parts are covered with tape or the like, and backshielding is performed by introducing argon gas or the like from the inlet end 11.
As shown in FIG. 7b, the reinforcing pin 17 and the side plate 18
Welding was performed while shielding the mating end from the outside. After welding of all the reinforcing pins in the A section is completed, the reinforcing pins are welded on the next B section in the same manner as above. in this case,
Open only the open ends 12 and 15 of parts B and E, and open the other open ends 11, 13, 1 of parts A, C, D, and F.
4 and 16 are performed after closing with tape or the like.

[Problems to be solved by the invention] However, since the above-mentioned backshielding method shields the entire interior of the structure, the internal volume is large and a large amount of expensive gas is required to replace the shielding gas. In addition, the shielding gas must have a purity of 99.97% or higher, but there is a problem in that it is difficult to completely replace the gas because there are many areas where the gas remains, and the above gas purity cannot be guaranteed.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a backshield device for welding rod-shaped members that can efficiently backshield only the welding location.

[Means for Solving the Problems] The backshield device for welding rod-shaped members according to the present invention is configured to supply shielding gas through the inside of a handle member that can be held and operated in the hand, and a box-shaped part is provided at the tip of the handle member. Install the shield cover of
The two parts are hinged so that they can be opened and closed so that the shield cover can be inserted into and removed from the side of the bar-shaped member that is the workpiece to be welded, and a spring is provided to bias the two parts in the closing direction, and the shield cover is attached to the handle member. A net is provided inside one part of the shield cover to make the shield gas uniform.

[Function] In the back shield device for welding rod-shaped members according to the present invention, when the box-shaped shield cover is held by the handle member and inserted into the target rod-shaped member from the side, the periphery of the rod-shaped member is surrounded by the shield cover. By supplying shielding gas into the shield cover through the handle member, the rod-shaped member and its surroundings can be backshielded. After welding the rod-shaped member, the shield cover can be opened and removed.

[Example] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially sectional side view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof.

In this embodiment, a hose 3 for supplying shielding gas is connected to the base end of a pipe-shaped handle member 1 via a plug 2.
A box-shaped shield cover 4 is attached to the tip of the handle member 1. This shield cover 4 is a titanium box-shaped structure 1 shown in FIG.
It consists of a small cylindrical body that can be inserted into parts A to F of 0, and is divided into upper and lower halves, the upper part 4a of which is fixed to the tip of the handle member 1, and the lower part 4b is fixed to the tip of the handle member 1. It is rotatably pivoted to the upper portion 4a. A spring 6 is tensioned inside to keep the upper part 4a and the lower part 4b always in a closed state. A net 7 is provided at the tip of the handle member 1, and the shielding gas is uniformly filled into the shield cover 4 through the net 7. Further, the side plate 4c of the shield cover 4 is provided with an inlet 4d for receiving the rod-shaped member 17 and an appropriate number of discharge holes 4e for discharging the shield gas, and furthermore, the lower part 4b of the shield cover 4 has an insertion end 4d. A tongue-shaped guide piece 4f is provided in a protruding manner.

This embodiment is configured as described above,
Next, how to use it will be explained.

FIG. 4 is an explanatory diagram of the case where the shield cover 4 is inserted into the rod-shaped member 17. As shown in this figure, first, the shield cover 4 is operated by holding the handle member 1 toward the target rod-shaped member 17. Then, apply the guide piece 4f to the lower side of the rod-shaped member 17 (see FIG. 4a).

Next, when the shield cover 4 is lifted and the opening is pushed open and inserted (see Fig. 4b), the rod-shaped member 17 enters the receiving opening 4d of the shield cover 4 from the side, and the shield cover 4 springs again. The mouth is closed with a force of 6 to surround the rod-shaped member 17 (see FIG. 4c).

When the pot 2 is opened in this state and the shielding gas is supplied into the shielding cover 4 through the inside of the handle member 1, the shielding gas is filled into the shielding cover 4 and wraps around the rod-shaped member 17 and the inner surface of the side plate 18 around it. Performs back shield. Therefore, only the welding location can be backshielded with a very small amount of shielding gas with high purity.

In addition, when removing the shield cover 4 from the rod-shaped member 17, it is sufficient to pull the handle member 1 as well.

Figure 5 shows a titanium box-shaped structure 1 using the above-mentioned embodiment device.
This shows an example of use in backshielding the reinforcing pins 17 of No. 0. In this case, shield covers 4 are inserted in order from the pins 17 at the back.

Next, FIG. 6 is a side view showing another embodiment of the present invention, in which a guide piece 4g shorter than the guide piece 4f is provided also at the mouth of the upper part 4a of the shield cover 4. In this case, unlike the case of the above embodiment, the shield cover 4 can be inserted and attached by simply pushing it straight into the rod-shaped member 17.

Further, although not shown, the upper portion 4a and the lower member 4b may be attached to the tip of the handle member 1 so as to be able to open and close together. Furthermore, it is also possible to open and close the upper portion 4a or the lower member 4b by manually operating the handle member 1 via a wire or the like.

[Effects of the invention] As described above, according to the invention, when welding a bar-shaped member such as titanium, the shield cover can be easily inserted from the side to the bar-shaped member even in a narrow space, and the back shield can be easily attached to the bar-shaped member from the side. can. In addition, since only the welding location can be covered almost completely with the shield cover, an extremely small amount of shielding gas is required, and the gas can be completely replaced, thereby improving welding quality.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing one embodiment of the present invention, Fig. 2 is a plan view of the same, Fig. 3 is a front view of the same, and Fig.
The figure is an explanatory diagram of the operation of inserting the shield cover into the rod-shaped member, Fig. 5 is an explanatory diagram showing an example of use of a titanium box-shaped structure with a reinforcing pin, and Fig. 6 is a side view showing another embodiment of the present invention. FIG. 7 is an explanatory view of welding reinforcing pins of a conventional titanium box structure. 1...Handle member, 2...Kotuku, 3...Hose,
4... Shield cover, 4a... Upper part, 4b
... lower part, 4c ... side plate, 4d ... reception port,
4e...Discharge hole, 4f, 4g...Guide piece, 5...
... shaft, 6 ... spring, 7 ... net, 17 ... rod-shaped member, 18 ... side plate.

Claims (1)

[Scope of utility model registration request] It is equipped with a handle member through which shielding gas passes, and a box-shaped shield cover attached to the tip of the handle member, and the two parts can be opened and closed so that the shield cover can be inserted into and removed from the rod-shaped member to be welded from the lateral direction. The two parts are hinged together, and a spring is provided to urge the two parts in a closing direction, and a net is provided inside one part of the shield cover attached to the handle member to equalize the shielding gas. Features: Back shield device for welding rod-shaped members.