JPS5843194B2 - Consumable nozzle welding method and nozzle fixing jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the invention of a consumable nozzle welding method and a jig suitable for carrying out the welding method.

BACKGROUND ART Consumable nozzle arc welding or electroslag welding is widely used as a method for butt welding steel plates, shaped steel, etc.

Figures 1 and 2 show the conventional method for butt welding T-shaped steels used for longitudinal materials etc. by consumable nozzle arc welding. According to this, the flanges of the butted T-shaped steels 1, The parts 101, 101 are welded, and then a hole 2 is drilled around the welded part, which leads to the abutting part of the web parts 102, 102. Copper butts 3 are arranged on both sides of the abutting part, and the hole 2 is opened. The abutting portions of the web portions 102, 102 are welded by inserting the consumable nozzle 4 through the web portions 102, 102.

However, in this conventional welding method, the consumable nozzle 4
Because the only fixing means for the consumable nozzle 4 is the clamp 5 on the top of the consumable nozzle 4, the consumable nozzle 4 tends to swing due to the influence of electromagnetic force etc. generated during welding, even when the material to be welded is a thick plate.
In the case of a thin plate, there is a problem in that the copper pads 3 on both sides are damaged by the vibrating consumable nozzle 4.

In addition, in the conventional method, the flux is injected through the hole 2, so the diameter of the hole 2 is made larger than that of the consumable nozzle 4 to provide a gap 6, but the shielding gas heated by the arc during welding Air is dissipated outward from the gap 6 of the hole 2, and as a result, outside air enters the space during welding through the minute gap between the copper dowel and the base metal T-shaped steel 1, 1, causing a significant impact on the quality of the weld. There is the problem of influence.

Furthermore, if the amount of flux added is increased in order to reduce the influence of outside air, the arc becomes unstable and welding defects are likely to occur, and it is very difficult to adjust the amount of flux added to avoid this.

In addition, from the viewpoint of preventing the above-mentioned outside air from entering, it is possible to cover the gap between the base metal and the copper pad 3 with tape, but this sealing itself is a complicated work, and high-temperature tape is also expensive. However, there is a cost problem.

Furthermore, there is a method of using conventional leak-proofing agents to close the above-mentioned gaps, but these leak-proofing agents contain some moisture, which tends to cause blowholes in the weld. There is a problem.

The present invention was devised to eliminate the drawbacks of the conventional welding methods as described above, and its purpose is to eliminate the vibration of the nozzle in consumable nozzle welding and to prevent the intrusion of outside air. Another object of the present invention is to provide a welding method that allows welding in a shielded state, and another object is to provide a nozzle fixing jig suitable for carrying out the welding method.

For this reason, the present invention performs welding using a nozzle fixing jig with a special structure, and using this nozzle fixing jig,
The consumable nozzle is fixed so that it does not vibrate, and welding is performed while the space to be welded is sealed.

An embodiment of the present invention will be explained below with reference to the drawings.

FIGS. 3 and 4 show the case where the method of the present invention is applied to butt welding of T-shaped steels 1 and 1 used as longitudinal members by the consumable nozzle type arc welding method.

Therefore, the nozzle fixing jig 7 used in the present invention is composed of a pair of dividing plates 8 degrees apart, and these dividing plates 8
, 8' constitute a jig main body by abutting their side surfaces.

Each of these dividing plates 8. Semicircular recesses 9, 9', which are semicircular when viewed from the plane, are formed on the side surfaces of the plates that abut against each other, and the pair of semicircular recesses 9, 9' allow the dividing plates 8, 8' to abut against each other. A nozzle insertion hole 10 is formed into which the consumable nozzle 4 is inserted when the nozzle is inserted.

Further, a flux injection hole 1 for introducing flux is located near the nozzle insertion hole 10 of this nozzle fixing jig 7.
1 is provided.

In this embodiment, like the nozzle insertion hole 10, the flux injection hole 11 is formed by a pair of semicircular recesses formed in both side plates 8, 8'.

Further, this flux injection hole 11 can be closed by a lid 12.

In the present invention, such a nozzle fixing jig 7 is disposed on the upper part of the workpiece to be welded. To describe this in detail in this embodiment, first, the T-beam 1.1 has its flange fixed in advance. The parts 101, 101 are welded, and a hole 2 communicating with the space between the web parts 102, 102 is bored in the welded area for the insertion of a consumable nozzle 4 therethrough.

Thus, the nozzle fixing jig 7 has a flange portion i such that the nozzle insertion hole 10 communicates with the hole 2 with the dividing plates 8 and 8' constituting the jig 7 being joined together via their side surfaces.
oi and '+oi, and the consumable nozzle 4 is fitted into the nozzle insertion hole 10.

Further, copper pads 3, 3 having a length spanning the entire length of the abutting portions are arranged on both sides of the abutting portions of the web portions 102, 102,
As a result, the abutting portion of the web portions 102, 102 becomes a sealed space 13 formed by the nozzle fixing jig 7 and the copper pads 3, 3, and the inside of this space 13 is used as the consumable nozzle 4.
It is welded by.

During this welding, the flux injection hole 11 is normally closed by the lid 12 and is opened only when flux is introduced.

In the present invention, by welding as described above, the consumable nozzle 4 is fixed by the nozzle fixing jig 7 in addition to the clamp 5 that fixes the upper part of the consumable nozzle 4, so that it is supported at two points and its swing is properly controlled. In addition, since the abutting portion of the web portions 102 and 102 is formed in a space 13 that is almost sealed by the copper butts 3 and the nozzle fixing jig 7, the shielding gas is not exposed to the outside during welding. and dissipation into
Accordingly, the intrusion of outside air through the gaps between the copper pads 3, 3 and the web portions 102, 102 can be significantly reduced.

Furthermore, if the dividing plates 8, 8' constituting the nozzle fixing jig 7 used in the present invention are made of a magnetic material such as mild steel,
As shown in FIG. 5, during welding, the current flowing through the consumable nozzle 4 inserted into the nozzle insertion hole 10 generates lines of magnetic force a in the dividing plates 8 and 8', and these lines of magnetic force a cause the two side plates 8 and 8' to The two side plates 8, 8' can be easily integrated into a joined state.

According to this, the dividing plates 8.8/ are joined only during welding, that is, when current is flowing through the consumable nozzle 4, and can be easily removed at other times.

Further, as mentioned above, both dividing plates 8.8' made of magnetic material
When applying to a magnetic material to be welded such as mild steel, the sixth
As shown in the figure, holes 14 or slits 14' are provided in each of the dividing plates 8, 8', and in this way, as shown in FIG. Due to leakage magnetic flux a' from the hole 14 or slit 14', the dividing plate 8,
8' is adhered to the material to be welded 15, and the nozzle fixing jig 7 itself can be reliably fixed to the material to be welded 15 during welding.

Therefore, this adhesive force depends on the current value in the consumable nozzle 4, the thickness of the dividing plates 8 and 8', the shape of the hole 14 and the slit 14' (
The appropriate strength is adjusted by appropriately selecting the width, length, cross-sectional shape), number, etc.

Note that the above description has been made regarding the case where the present invention is applied to butt welding of T-shaped steel.

It goes without saying that the present invention can be applied to welding other types of steel or steel plates as shown in FIG.

Note that when applied to a thick plate material to be welded 15.15 as shown in FIG. , are placed on the upper end surface of the welded material 15.15.

Further, in the above embodiments, the case where the present invention is applied to consumable nozzle type arc welding has been described, but the present invention can also be applied to other consumable nozzle type welding, such as electroslag welding.

According to the present invention as described above, since welding is performed by holding the consumable nozzle at two points, the swinging of the consumable nozzle is suppressed, thereby preventing the consumable nozzle from hitting the copper pad and damaging it when welding thin plates. In addition to properly preventing such situations, welding can be performed with the space to be welded in a sealed state without the need for work such as sealing, which prevents the shielding gas from dissipating outward and the resulting intrusion of outside air. This allows a stable arc to be obtained, and by stabilizing the arc, there is no need to input too much flux.
Therefore, it has excellent industrial effects, such as making it extremely easy to adjust the input amount.

[Brief explanation of drawings]

FIGS. 1 and 2 show how conventional consumable nozzle welding is carried out, with FIG. 1 being a front view showing the welded area in a cutaway state, and FIG. 2 being a perspective view. 3 and 4 show a state in which the method of the present invention is carried out and a nozzle fixing jig. FIG. 3 is a front view showing the welding location with a cutout, and FIG. 4 is a perspective view. FIG. 5 is a diagram showing the flow of magnetic lines of force when the nozzle fixing jig of the present invention is made of a magnetic material. FIG. 6 is a plan view showing another embodiment of the nozzle fixing jig. Figure 7 shows the usage status of the item shown in Figure 6.
FIG. 3 is an explanatory diagram showing a cross section taken along a line. FIG. 8 is a perspective view showing another embodiment of the method of the present invention. In the figure, 7 is a nozzle fixing jig, 8, 8! is a dividing plate,
92g is a semicircular recess, 10 is a nozzle insertion hole, and 11 is a flux injection hole.

Claims (1)

[Scope of Claims] 1. Consisting of a pair of divided plates whose side parts are abutted against each other, and a nozzle insertion hole formed by a semicircular concave portion of both side plates is provided at the abutting part of the two side plates. A nozzle fixing jig having a pluggable flux injection hole near the nozzle insertion hole is placed above the welding material, and copper butts are placed on both sides of the welding material, and the nozzle A consumable nozzle welding method characterized in that the space formed by the nozzle fixing jig and the copper dowel is welded in a sealed state by fitting the consumable nozzle into the nozzle insertion hole of the fixing jig. 2 Consists of a pair of divided plates that are used with their side parts abutted against each other, and a nozzle insertion hole for fitting a consumable nozzle formed by a semicircular recess of both side plates is provided in the abutting part of the two side plates. 2. The nozzle fixing jig for consumable nozzle welding according to claim 1, further comprising a closable flux injection hole near the nozzle insertion hole.