JPS595503Y2 - Shield gas encapsulation structure of inert gas arc welding equipment - Google Patents

Description

[Detailed explanation of the invention] This invention can be used in TIG, MIG, Co2 welding, etc.
This invention relates to a shielding gas enveloping structure that protects the shielding gas that covers the welding location and its surroundings from water or strong winds.

When inert gas arc welding, such as TIG, MIG, or CO2, is performed underwater or under strong winds, welding occurs at the welding point and its surroundings, that is, between the tip of the torch from which the inert gas is spouted and the base metal. In order to prevent water or strong wind from entering the high-temperature space and destroying the above-mentioned inert gas atmosphere, conventionally, as shown in FIG. It is known that a shield gas enveloping layer 22 is provided around the outer periphery of an inert gas passage 21 in which a large number of fine metal wires are made to have fine pores and are bundled into a skirt shape.

By using the welding device provided with the above-mentioned shielding gas enveloping layer 22, the shielding gas in the high-temperature space 23 is isolated and protected from the outside by the shielding gas enveloping layer 22. For example, when welding is performed underwater, High heat space 2 above
3.Proper welding can be achieved by preventing the inert gas atmosphere inside the high-temperature space from being blown away when water enters and destroys the internal inert gas atmosphere, or when welding is performed under strong winds. It can be carried out.

However, the above conventional configuration can only be applied when the base material is a thin plate and the groove is shallow; if the base material is a thick plate and the groove is deep, the shielding gas enveloping layer extends to the deep part of the deep groove. There is a problem in that it is difficult for the metal wire forming the groove 22 to enter, and the enveloping effect of the shielding gas ejected toward the inside of the groove becomes poor, making it impossible to perform proper welding.

This idea was created in view of the above problems, and is an inert gas arc welding device that can accurately enclose shielding gas and perform proper welding even when welding thick plate base materials with deep grooves. The purpose is to provide a shielding gas encapsulation structure.

An embodiment of this invention will be described below with reference to the drawings.

Figures 1 and 2 illustrate an MIG welding device to which this invention is applied, and in the figure, 1 is an MIG welding device.
In the welding torch body, an electrode 2a is slidably fitted to a contact tip 2 in the center.
An annular gas passage 3 is formed on the outer periphery of the annular gas passage 3, and an inert gas such as argon or helium is ejected as a continuous flow in the direction of arrow a from the outlet of the annular gas passage 3.

The torch main body 1 has an inner nozzle 1a and an outer nozzle 1b.
The inner nozzle 1a is fitted into the outer nozzle 1b so that its tip part can be freely projected and retracted.

4 indicates an annular member.

This annular member 4 is attached to the inner periphery of the tip of the outer nozzle 1b by, for example, screwing, and forms an annular groove 5 with a downward opening. While fitting the part 6a, the annular member 4
By fitting (for example, screwing) the fixing ring 7 onto the extending portion 4b of the outer nozzle 1,
The inner periphery of b, that is, the annular gas passage 3 of the inner nozzle 1a
It is fixed around the outer periphery of the

The shield gas enveloping layer 6 has a diameter of 0.03 to 0.3 m.
m of seawater-resistant, ultra-fine, flexible, and elastic metal wires (wires) made of stainless steel, copper, brass, etc., are made into a skirt shape at a density of 200 to 1000 wires per 1 cm2 of cross-sectional area. It is formed in a concentrated manner.

Reference numeral 8.8 denotes a pair of groove shielding gas enveloping layers provided facing each other, and this enveloping layer 6 is also made of ultrafine, flexible, and elastic seawater-resistant material such as stainless steel, copper, or brass. It is formed by converging metal wires into a brush shape with fine pores at a density of 200 to 1000 metal wires per 1 cm2 of cross-sectional area, and the base end 8a is formed by, for example, the outer annular body 9 attached to the outer nozzle 1b. It is fitted and fixed into the groove 9a.

Reference numeral 10 denotes a base material in which a shielding gas inflow passage 11 and a shielding gas inflow passage 11 face each other with a groove 12 therebetween.

In the above configuration, when welding is performed, as shown in FIGS.
The torch body 1 may be moved along the groove 12 after the inner shield gas covering layers 8, 8 are fitted into the groove 12 so as to be in contact with the inner surface of the groove 12.

In this case, an inert gas flow is ejected from the annular gas passage 3 of the torch body 1 so as to cover the welding location and its surroundings.

Since the inert gas ejected from the annular gas passage 3 onto the surfaces of the base materials 11, 11 is covered by the shield gas covering layer 6, it is isolated and protected from the outside, that is, from seawater and strong winds, and is protected from the slits. If the inert gas passes through the groove and is underwater, it is released as small bubbles to prevent seawater from entering.In addition, the inert gas ejected from the annular gas passage 3 into the groove 12 is absorbed by the shielding gas enveloping layer 6 inside the groove. coated with the base material 11.11
The welding area and its surrounding area, i.e. the high temperature space
to create a complete inert gas atmosphere to enable proper welding.

As the welding within the groove 12 progresses, beads 14 are formed one after another, and the groove 12 becomes shallower, as shown in FIGS. 4 and 5, the shielding gas enveloping layer 8, 8
(This cutting operation can be easily performed with a hand chain.)

) By performing welding while the groove 12 is deep or shallow, the shield gas blown out into the groove 12 is protected by the groove shield gas enveloping layers 8, 8, and the inert gas atmosphere in the high-temperature space 13 is maintained. This allows for proper welding.

On the other hand, the length l of the electrode 2a protruding from the contact tip 2 affects the run-out of the weld bead and the melting rate of the electrode (wire) 2a, so even if the number of weld layers in the groove 12 increases, In order to keep the protrusion length l unchanged, the inner nozzle 1a can be moved upwardly, as can be seen in FIGS. 3 to 5.

On the other hand, if the groove 12 is deeper, the shielding gas coating/color layers 8, 8 within the groove will become longer, and as a result, unless the focusing thickness is increased, the metal wire will become weaker and more likely to bend. Become,
In practice, increasing the focusing thickness may result in the torch body 1
Because the outer shape of the groove becomes large and it becomes difficult to use, as shown in Figs. The reinforcing plate 15 formed of a seawater thin plate is 1 to -
- By setting the chi main body 1 so that it can reciprocate in the axial direction, the shielding gas in the groove 12 can be covered while preventing the above-mentioned buckling.

By forming the inner surfaces of the two-wave color layers 6, 8.8 from, for example, carbon fiber instead of the above-mentioned materials, it is expected that even more sufficient heat resistance and improvement in spatter adhesion prevention properties can be expected.

Although the above embodiment describes an example in which the in-groove shielding gas covering layers 8, 8 are provided on the outside of the shielding gas covering layer 6, this invention is not limited to this. Even if the in-groove shielding gas covering layers 8, 8 are provided inside the shielding gas covering layer 6, the same effect as in the above embodiment can be obtained.

Furthermore, although it only talks about MIG welding, T
Needless to say, it is applicable to IG, CO2, plasma welding, and the like.

As explained above, this idea fits the groove-internal shielding gas enveloping layer into the groove of the base material, and also follows the formation of a bead, which causes the groove to become shallower and its cross-sectional shape to change. Since the structure is configured to cut the shield gas enveloping layer inside the groove, the shield gas ejected into the groove can be accurately encapsulated, and water can be prevented from entering the inside of the groove during underwater welding. There is an advantage that it is possible to prevent wind from entering the groove during welding under strong wind conditions, and to perform welding appropriately.

[Brief explanation of the drawing]

Fig. 1 is a partial front view of an inert gas arc welding device to which this invention is applied, Fig. 2 is a side view of the same, Figs. 3 to 5 are illustrations of the state of use, and Figs. 6 and 7 are FIG. 8, which is an explanatory diagram showing the attachment of the reinforcing plate and the operating state, is a partial sectional view of a conventional example. 1...Torch body, 1a...Inner nozzle, 1b...Outer nozzle, 3...Inert gas passage, 4...Annular Part, 6...
Shield gas enveloping layer, 8, 8... Shield gas enveloping layer in groove, 11.11... Base material, 12...
...Bevel, 15...Reinforcement plate.

Claims (1)

[Scope of utility model registration request] A shielding gas enveloping layer consisting of a large number of ultra-fine, flexible and elastic metal wires that have fine pores and are gathered into a skirt shape is placed around the outer periphery of the inert gas passage of the torch body formed by the outer nozzle and the inner nozzle. In the inert, gas arc welding device formed by forming the shielding gas, the shielding gas encapsulating layer is fitted into the outside or inside of the layer so as to face each other so that the tips thereof are in contact with the inner surface of the groove of the base material, and the depth of the groove is A shielding gas enveloping layer is provided in the groove in which ultra-fine, flexible, and elastic metal thin wires are bundled into a brush shape and have fine porosity and can be brought into contact with and cut the tip in response to changes in the thickness. , the proximal end of the shield gas enveloping layer is fixed to an annular member attached to the inner periphery of the tip of the outer nozzle, and the inner nozzle is fit into the outer nozzle so as to be protrusive and retractable, and the shield in the groove A shield gas encapsulation structure for an inert gas welding device, characterized in that a reinforcing plate that is movable back and forth in the axial direction of a torch body is set on the outer surface of the gas encapsulation layer.