JPS58132367A - Solid agent for preventing flowing-out of molten slag and molten metal for welding - Google Patents

Abstract

PURPOSE:To prevent flow-out of a molten slag or a molten metal by inserting a molding body into a groove, by forming a section in the lengthwise direction of a cuttable molding body whose main component is a fire resistance solvent, in a similar form to a groove form of downhand welding. CONSTITUTION:Thick steel plates 13, 14 to be welded is tack-welded at a prescribed interval to a reverse metallic strap 15, and in conformity with a prepared groove shape, tab plates 16, 16' are welded and fitted. Subsequently, in conformity with a groove prepared by the tab plates 16, 16', a flow-out preventing agent 12 is inserted, and welding materials 13, 14 are latent arc-welded or MIG-welded. As a result, a molten slag or a molten metal is stopped by the flow-out preventing agent 12, and a bead end part is laminated by making the inside face of the flow-out preventing agent 12 as a boundary. Accordingly, it is unnecessary to use a lng tab material, and the welding material is not wasted. Also, the reciprocating welding decided by a position of the flow-out preventing agent 12 can be executed, and welding of a thick plate can be executed continuously and automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid agent for preventing the outflow of welding slag, and in particular for preventing the outflow of slag at the end of thick plate welding or the end of electric slag welding. Concerning solid agents for preventing spillage.

Recent steel-framed pressure vessels have become larger, and the thickness of the steel used is 3.5mm for box columns that form the skeleton of steel-framed structures.
In a 0-59Ij pressure vessel, the volume reaches 60-200 ml. Therefore, there is a need to establish a method for efficiently welding such thick plates.

That is, as shown in Fig. 1, box columns used in architecture, bridges, etc., are relatively light structures, and are made by combining C-shaped steel members 1 and 2 and welding the weld line 4 to form a box-shaped C2. If necessary, diaphragms 9 (reinforcing members) are attached by welding at desired intervals. Due to the increase in size, this box column has a plate thickness of 3,911 mm or more, and the method of manufacturing the box column is not by combining two pieces of U-shaped steel as described above, but by assembling the upper plate with 5 pieces as shown in Fig. 2. Lower plate 6. A box is formed by the side plates 7.8 and the respective corners 11 are welded together to produce the box.

A diaphragm 9 is also attached to this large box column. The method for installing the diaphragm is to weld and install the diaphragm 9, which has an auxiliary plate 10 for forming a welding bridge LCjI tip) welded to the upper plate 5, which has been processed to form a welding groove, and the lower plate 6. Take the side plate 7゜8 and weld the weld line 11 to make a box column with a diaphragm, and attach the diaphragm 9 to it.
C--After drilling a hole from the weld line 11 so as to extend the groove created by the provided auxiliary plate 10, the box column is manufactured by electroslag welding the groove and hole continuously.

However, in the conventional method, it is wasteful to drill holes at important corner welds of the box column after welding, and it is difficult to machine the grooves and holes in a straight line, and the shape of the hole relative to the groove is Although it is necessary to approximate the dimensions as much as possible, this is not easy and results in various problems. Also, as the structure becomes heavier, the number of diaphragms increases as they are inserted at short intervals (for example, 2 m).
There is now a need for a method for efficiently and reliably welding diaphragms.

On the other hand, when butt welding a single steel plate, if the plate is thin, it is easy to weld by providing a tab plate of the required length at the start and end of the weld line, and then cutting the tab plate after welding is complete. be. However, when the thickness of the steel material is 100 mm to 200 mm + 2, such as in a nuclear reactor vessel, the tab plate becomes large and long, and it is wasteful to weld including the tab part, and it is not easy to cut that part. That's not the point. Even in this case, there has been a demand for a reliable welding method for the necessary parts without waste.

The present invention has been made in view of the above-mentioned circumstances, and
The gist of this is a solid agent that prevents the flow of molten slag or molten metal during welding, where the longitudinal cross section of a cuttable molded body containing a fire-resistant solvent as a main component is similar to the groove shape of downward welding. .

The two solid agents for preventing runoff of molten slag and the like (hereinafter referred to as runoff preventive agents) of the present invention will be described in detail below.

First, the components of the anti-bleeding agent must be such that they do not easily melt when molten slag and metal come into contact, and even if they do, they must not turn into molten slag and have an adverse effect on the weld metal. As a result of various studies, it was decided that the main component would be granular powder of refractory minerals such as silica sand, magnesia, and zircon sand, with other slag agents added as needed.

The granular material made of this fire-resistant solvent is wet-mixed with a binder such as water glass, resin, silicone rubber, etc., and then molded into a predetermined mold and dried to form a solid shape. It is a solid that can be easily cut into any desired length in the longitudinal direction when dried and solidified, and the cross-sectional shape in the longitudinal direction is approximately similar or congruent with the groove shape of downward welding. It is molded into.

Therefore, the outflow preventive agent of the present invention is adapted to the shape of the groove where the flow of slag is to be stopped or the groove where the weld bead is to be stopped, and it is formed or cut into a predetermined length and inserted into the groove. It can be used.

Next, an example of the use of the outflow prevention agent of the present invention will be explained in detail based on the drawings.

FIG. 2 is a perspective view showing a welded structure including a diaphragm of a box column, and FIG. 3 is a perspective view showing a shape corresponding to each groove shape of the outflow prevention agent of the present invention. FIG. 4 is an enlarged view showing the completion of electroslag welding using the flow prevention agent of the present invention. FIG. 5 is a perspective view of a case where an anti-bleeding agent is used at the end of thick plate butt welding.

The outflow prevention agent shown in Fig. 3 (A) is used for an L-shaped groove that uses a filler at the bottom, such as the welding groove 11 shown in Fig. 4, and has a cross-sectional shape congruent with the groove shape. has. length l
The length is convenient for manufacturing and handling, for example, 501 to 300 mm.
), and when using it, cut it to the specified length shown on the dotted line side using gold copper or the like. In Figure 3 (B), the groove shape is an inverted trapezoid, C)
These are examples of the outflow prevention agent of the present invention used in cases where the groove shape is I-type. In addition, when using (1) (if the groove shape (d) does not match and there is a gap, scrape it off with a metal piece etc. as appropriate and use it so that there is no gap.

As an example of use, first, there is a case where vertical electrosmooth two-g welding and downward submerged arc welding intersect, as shown in FIG. When performing vertical electroslag welding, the anti-bleeding agent 12 is inserted into the groove 11 at intervals that are equal to or wider than the width of the groove made by the auxiliary material of the diaphragm 9. When electroslag welding using the coated consumable nozzle 18 is started with the anti-flow agent set in this way, and the welding progresses upward, the molten slag will flow out even if it reaches the groove of the downward weld. The inhibitor 12 prevents the slug boule from flowing to both sides (the necessary depth of the slag boule is ensured; it can be maintained), and a sound welding result can be obtained up to the bottom of the downward welding groove 11.

FIG. 5 shows an example in which the anti-bleeding agent 12 is used in butt welding of thick plates. Thick steel plates 13 and 14 to be welded are tack-welded to the backing metal 15 at a predetermined interval, and tab plates 16 and 16' are welded and attached in accordance with the groove shape created. The outflow prevention agent 12 is inserted and used in accordance with the created groove. Set the other end in the same way.

When the materials to be welded 13 and 14 are submerged arc welded or MIG welded with the flow prevention agent of the present invention set in this manner, the molten slag or molten metal is stopped by the flow prevention agent 12 and the inside of the flow prevention agent 12 is removed. The pead ends are laminated with the sides as boundaries. Therefore, unlike conventional thick plate welding, a long tab material is not used, and there is no waste of welding material. In addition, reciprocating welding can be performed at the position of the outflow prevention agent 17,
Continuous automatic thick plate welding is possible.

A welding groove 11 formed by the side plate 8 and the upper plate 5, and a welding groove of 20 x 20 mm formed by the diaphragm 9 with a plate thickness of 2011 mm and the auxiliary plate 10 are prepared, and the groove 11 for downward welding is as follows: A hole was made with a width slightly wider than the welding groove of the diaphragm, and the anti-bleeding agent 12 was inserted on both sides of the hole.

This anti-spill agent consists of a solid agent of 5i0285%, A120311ch, and a binder (silicone rubber).
The cross-sectional shape is 3081, congruent with groove 11 of downward welding.
A long piece of 111 was cut into a short piece of 3QIl using a gold mine and fitted.

Welding is done by using a consumable nozzle 18 to cover the vertical welding of the diaphragm 9.
Electroslag welding can be carried out using a
The slag composition did not substantially change during the welding process, and after welding was completed, the outflow prevention agent and slag were removed, and the weld metal had risen to the bottom of the groove in downward welding, and the next weld metal had risen to the bottom of the groove. Submerged arc welding could be carried out without any additional manual work.

In addition, as shown in Fig. 5, a steel plate 13.1 with a plate thickness of 100 mm is used.
4 is tack-welded to the bottom part 20II and the surface part 35II11 using the backing metal 15, and prepare tab plates 16 and 16' of the same type of steel with a length of 50 mm so that they have the same grooves. did.

Outflow prevention agent 12 is a solid agent consisting of Mg092%, 5i024%, and the others are a binder (water glass) and J.The cross-sectional shape is congruent with the groove shape, and the length is cut into two pieces at 8 degrees. Then, one part of the surface was ground with a piece of iron to ensure close contact with the groove, and the cut surface was set on the tab plate side by 201 m from the material to be welded.

Welding is done with flux (medium manganese oxide flux), wire 2.4 IIIφMn; 1.82% + Mo: 0
．． 51% was used. Welding conditions: 310A, 4. -3
V.

Welded in one layer at 2.2σ/m#l.

As a result, although some of the anti-bleeding agent melted, there were no problems with welding, and sound welding was achieved with the minimum necessary edges.

As explained above, the molten slag for welding and the molten metal outflow prevention agent of the present invention have good workability, can be easily inserted into a groove, are easy to handle, and have good welding results.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional thin plate box column, Fig. 2 is a perspective view including a partial cutout showing the structure of a heavy box column to which the present invention spill prevention agent is applied, and Fig. 3 A, B, and C are the main parts. FIGS. 4 and 5 are perspective views of the invention anti-spill agent. FIGS. 4 and 5 are perspective views showing examples of how the anti-spill agent is used. 5... Upper plate 6... Lower plate 8... Side plate 9
...Diaphragm 11...Downward bevel 12...
Outflow prevention agent 15... backing money 'fj, 1 figure 2 figure 3 prisoner (A)

Claims (1)

[Claims] A solid agent for preventing outflow of molten slag and molten metal for welding, characterized in that a longitudinal cross section of a cuttable molded body containing a fire-resistant solvent as a main component has a shape congruent with the groove shape of downward welding. .