JPH03142071A - Dispersed flux drop preventive device for corner joint submerged arc welding - Google Patents

Abstract

PURPOSE:To avoid an influence by high temperature and to prevent a drop of flax by providing limited intervals among plural flux drop preventive members which are abutted on side plates of a corner joint and prevent the drop of dispersed flux with the progress of submerged arc welding. CONSTITUTION:Respective flux receiving copper plates (flux drop preventive members) 6 move to the vicinity of a welding arc and prevent the drop of flux with the progress of submerged arc welding. At this time, since 0.3-0.5mm intervals are provided among the respective flux receiving copper plates 6, even if the respective copper plates 6 expand by the high temperature of arc welding, it is absorbed by the intervals and it is prevented that the respective copper plates 6 exert the influence mutually to cause deformation. Accordingly, the influence by thermal expansion on the respective copper plates 6 is avoided and the drop of dispersed flux is surely prevented only by limiting the intervals among the respective copper plates 6 without using water cooling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for automatically welding a corner joint part such as a box column, which is the main pillar of a building, by submerged arc welding. This invention relates to a device for preventing sprinkled flux from falling.

[Prior Art] In recent years, with the rapid increase in the construction of high-rise buildings, the production of box columns, which are the main pillars of buildings, has also rapidly increased.

Also, the shape and thickness of box columns have become significantly thicker. When manufacturing box columns, as the plate thickness increases, conventional welding methods require too much welding time, resulting in extremely high costs.

Therefore, we decided to simultaneously (
A welding method has been developed in which two seams are welded in one run. This welding method is submerged arc welding, which uses a large current to weld thick plates in one run, resulting in a much higher heat input than conventional methods. and.

During welding, when welding flux is normally applied to weld both sides of a box column, the flux spills from the inside of the box column, making welding impossible. For this reason, a flux receiver is required to stop the sprinkled flux from falling. This flux receiver also follows the progress of welding (sometimes the flux receiver is fixed and the workpiece is moved).

Conventional flux receiving belts for submerged arc welding (see Japanese Utility Model Application Publication No. 57-82478) are used for horizontal welding, etc., by connecting endless rubber belts or strip-shaped copper plates (flux drop prevention members) and using caterpillar belts. An endless structure is used.

These belts need to be in close contact with the workpiece to prevent flux from spilling out, and in order to be in close contact with the welding area, they are also required to have heat resistance and distortion resistance against the temperatures generated during welding. Ru. Note that the temperature near the arc during horizontal welding is estimated to be about 150 to 250°C.

For this reason, conventional rubber belts use materials with high heat resistance (approximately 300 degrees Celsius), and caterpillar belts using copper plates are small and have copper plates that are in close contact with each other. I am using a structure that is connected by .

[Problems to be Solved by the Invention] However, the temperature near the arc during welding of a thick box column as described above rises to approximately 700 to 1000°C.

Therefore, conventional rubber belts cannot be used in terms of heat resistance, and even with caterpillar type copper plates, the expansion of the copper plates due to heat causes these copper plates to rub against each other, deforming them into convex shapes, causing flux to spill out and cause franks. The receiver no longer functions as a belt. In order to avoid such expansion of the copper plate due to heat, it is possible to use a water-cooled copper plate, but this is difficult due to the structure of the caterpillar.

The present invention provides (1) a sprinkled flux for corner joint submerged arc welding that can extremely easily avoid the effects of expansion of each member even at high temperatures, and reliably prevent the sprinkled flux from falling in, for example, a caterpillar type welding system. The purpose is to provide a fall prevention device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the sprinkled flux drop prevention device for submerged arc welding of a square joint of the present invention sequentially applies a drop of sprinkled flux to the side plate of the square joint as the submerged arc welding of the square joint progresses. The present invention is characterized in that a plurality of flux fall prevention members that come into contact with each other to prevent the spread flux from falling are spaced apart from each other by 0.3 to 0.5 cm.

[Function] In the sprinkled flux fall prevention device for square joint submerged arc welding of the present invention described above, since there is an interval of 0.3 to 0.5 m between the flux fall prevention members, each flux fall prevention device due to high temperature Even if the member expands, the expansion is absorbed by the gap, and each flux drop prevention member is not deformed, and the adhesion between each flux drop prevention member and the side plate of the corner joint is maintained. Also, 0.3 to 0.
Even if the spacing is 5 m, the particle size of the sprinkled flux is larger than this, so the sprinkled flux will not fall through the gap between the flux fall prevention members.

[Embodiments of the Invention] Hereinafter, a device for preventing falling of scattered flux for square joint submerged arc welding as an embodiment of the present invention will be explained with reference to the drawings. Fig. 2 is a cross-sectional view (enlarged cross-sectional view taken from ■-■ in Fig. 4), Fig. 3 is a plan view thereof,
FIG. 4 is a front view thereof, and FIG. 5 is a side view showing a submerged arc welding apparatus to which the apparatus of this embodiment is applied.

First, the configuration of a submerged arc welding apparatus to which the apparatus of this embodiment is applied will be briefly explained with reference to the fifth drawing. In Fig. 5, 1 is a box column to be welded.
Members 1a and la on the left and right sides of this box column 1 and member 1
Rectangular joint portion (corner joint portion) lc, lc between both sides of b
to weld.

Note that the member 1b is supported by steel backings ld, ld. Further, 2 is a welding traveling truck main body, and this traveling truck 2 is configured to be able to travel along the longitudinal direction of the box column 1 and to be symmetrical. Furthermore, the traveling trolley 2 is equipped with a pair of left and right welding wire nozzles 3, 3 for simultaneously welding the left and right tip portions 1c, lc, as well as welding wire nozzles 3, 3 for welding along the longitudinal direction of the box column 1. A flux supply device (not shown) is also provided for dispersing flux 4 to the left and right cutting tip portions 1c, lc prior to the movement of the wire nozzles 3, 3 when the wire nozzles 3, 3 move.

5 is the edge portion 1c on both sides of the upper part of the box column 1.
, lc is a sprinkled flux fall prevention device provided symmetrically on the traveling cart 2 to prevent the flux 4 sprinkled along the lines t5 from spilling, and this sprinkled flux fall prevention device t5 is shown in Fig. 1.2. It is configured as shown in .

That is, a plurality of strip-shaped flux receivers are connected to a copper plate (flux fall prevention member) 6 and a pair of upper and lower endless chains 7.7.
are attached to and connected in a caterpillar manner. The copper plate 6 and the chain 7 are connected to the sprocket 8. The copper plate 6 and the chain 7 can be moved while being guided by the chain guides 9 and 10, and the copper plate 6 and the chain 7 are horizontally supported by the chain guides 9 and 10. In addition, in FIG. 1, 11 is a tensioning device for adjusting the slack of the chain 7.

Such a sprinkled flux fall prevention device 15 is.

As shown in FIGS. 3 to 5, the flux receiver presses the copper plate 6 against the side surface of the member 1a of the box column l near the welding arc along the guide shaft 13 by the cylinder 12 provided on the gate-shaped traveling trolley 2. Each copper plate 6 prevents the flux 4 from falling, and can also cope with changes in the shape of the box column l.

At this time, the copper plate 6 of the flux receiver is pressed against the side surface of the member 1a of the box column 1 by the cylinder 12, and due to the frictional force, moves on the side surface of the member 1a of the box column 1 as welding progresses, and is constantly It comes into close contact with the side surface of the member 1a.

That is, as the submerged arc welding progresses, the copper plates 6 of the plurality of flux receivers sequentially come into contact with the side surface of the member 1a of the box column 1 (the side plate of the square joint), thereby preventing the sprinkled flux 4 from falling.

In addition, as the copper plate 6 moves, the chain 7 moves to the sprocket 8.
．． It rotates while being guided by chain guides 9 and 10. In addition, the sprinkled flux fall prevention bag M5 is
As shown in FIGS. 4 and 5, it is provided so as to be rotatable around the α-axis on the traveling carriage 2, so that the traveling rail (not shown) of the traveling carriage 2 and the box column 1 are arranged in parallel. It is now possible to deal with cases where this is not the case.

By the way, conventionally, as described above, when a plurality of copper plates 6 are connected in an endless manner as described above.

The distances between the copper plates 6 were made to be substantially close to each other.

However, in this embodiment, as shown in FIG.
There is an interval Δ of 0.3 to 0.5 ms+ between them. Theoretically, this interval Δ is found based on the following calculation formula, taking into consideration the dimensions of the copper plate 6 and the like.

That is, (thermal expansion length ΔL)=(thermal expansion coefficient)×(copper plate length)×(temperature change amount).

For example, ΔL = 16.6 X lo'X 32m
X 750 = 0.398m.

Therefore, the flux 4 does not fall out from the gaps between the copper plates 6 (the particle size is made smaller than the particle size of the flux 4).
In addition, as a result of considering both the length that can absorb the thermal expansion length, the distance Δ between each copper plate 6 is 0.3 to 0.5a.
*The range has been determined.

Although FIG. 5 only shows the left side of the submerged arc welding apparatus and only partially shows the right side, the apparatus is constructed symmetrically.

With the above-described configuration, as submerged arc welding progresses, each flux receiver moves while being in contact with the vicinity of the welding arc, thereby preventing the flux 4 from falling.

At this time, in this embodiment, the distance between the copper plates 6 is 0.3~
Since the spacing Δ of 0.5- is provided, even if each copper plate 6 expands due to the high temperature of arc welding, the expansion will reduce the gap Δ.
The copper plates 6 do not influence each other due to expansion and deform, and the adhesion between each copper plate 6 and the side surface of the member 1a of the box column 1 is maintained. Therefore, without using a large-scale method such as water cooling, by simply limiting the interval Δ between each copper plate 6, the influence of thermal expansion of each copper plate 6 can be avoided extremely easily, and the falling of the sprinkled flux 4 can be ensured. Prevented.

Furthermore, even if there is an interval Δ of 0.3 to 0.5- between the copper plates 6, the particle size of the sprinkled flux 4 is larger than this, so the sprinkled flux 4 will not spill out from the gaps between the steel plates 6. There isn't.

[Effects of the Invention] As described in detail above, according to the sprinkled flux drop prevention device for square joint submerged arc welding of the present invention, the distance between the flux drop prevention members is 0°3 to 0.5p. With this extremely simple configuration, even if each flux drop prevention member expands due to high temperature, the expansion is absorbed by the above-mentioned spacing, so even at high temperatures, the effects of expansion of each flux drop prevention member are extremely easily suppressed. This has the effect of reliably preventing the sprayed flux from falling.

[Brief explanation of the drawing]

Figures 1 to 4 show a device for preventing the falling of scattered flux for corner joint submerged arc welding as an embodiment of the present invention. 3 is a plan view thereof, FIG. 4 is a front view thereof, and FIG. 5 is a side view showing a submerged arc welding apparatus to which the apparatus of this embodiment is applied. In the figure, l-box column, la, lb one member, 1c
m gradual opening part (corner joint part), 1d- steel backing, 2- traveling trolley for welding, 3- wire nozzle for welding, 4-
Flux, 5-Distributed flux fall prevention device, 6-Flux receiver is a copper plate (flux fall prevention member), 7-Endless chain, 8-Sprocket, 9.10-Chain guide, 11-Tension device, 12-Cylinder, 13 −
guide rod.

Claims (1)

[Claims] As the submerged arc welding of the square joint progresses, a 0.3-0.
A scattering flux fall prevention device for square joint submerged arc welding characterized by having a spacing of 5 mm.