JPS6178577A - Diaphragm welding method of box column - Google Patents

Abstract

PURPOSE:To improve the quality of a weld zone, and to improve the efficiency by forming the shape of a diaphragm to a quadrilateral, placing a refractory body in a groove part of the horizontal direction in which grooves of the horizontal and vertical directions cross each other, and bringing the groove of vertical direction to electroslag welding. CONSTITUTION:A diaphragm 2 is inserted into a box column of a state that the upper part has been opened, and thereafter, a strap 3 and skin plates 1a, 1b and 1c are fixed by tack welding. A wire guide nozzle 10 is inserted from the upper part of the groove, a welding wire 9 is fed to the inside of the groove through the nozzle 10, and welding is executed from a groove 14 of the vertical direction. As soon as welding is started, a flux for forming a slag bath is thrown in, and thereafter, welding is continued until a level of a molten metal reaches a slit 18 of the upper part of the skin plates 1a, 1b. By a heat insulating effect of a refractory body 15 provided on the bottom part of the groove, an arc heat works effectively on a formation of a molten slag, and immediately after welding has been started, it is shifted to stable electroslag welding, and sound weld zone is obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of welding a diaphragm attached as a reinforcing material to the inner surface of a box column, and improves efficiency by 1% when electroslag welding is applied to the welding method. This article relates to a method that contributes to improving the quality of welded parts.

(Prior art) When electroslag welding a diaphragm to the inner surface of a box column in the back production of a box column, skin welding is performed with one top surface of the box column open as shown in Figure 5.
Assemble 1cL, 16L and LC, and perform the skin play) 1
cL, lb Insert diaphragm 2 inscribed in the fabricated IC. A cap 3 is temporarily attached to the diaphragm 2,
Skin plate lα, 16-piece Ic and diaphragm 2
The end face forms a groove with an appropriate gap. A cross section of the groove is shown in FIG.

The skin plate lα is temporarily assembled as described above.

16 The first step for the assembled IC and diaphragm 2 is to weld the two points indicated by arrows 4 and 5, and then add another skin plate (not shown) to the open part of the box column. Place it and temporarily attach it.After that, attach the box column to 90
Rotate ° and perform welding with the groove in the direction of arrows 6 and 7 perpendicular.

A variety of innovations have been devised to carry out this first welding process. FIGS. 7 and 8 show specific examples thereof. First, in the example shown in FIG. During this period, the awakening pressure is applied and started. 10 is a guide nozzle for the wire 9. On the other hand, in the example shown in Fig. 8 (Japanese Patent Publication No. 59-21714), the shape of the diaphragm 2 differs from the above-mentioned example in that the corners have been removed, and the diaphragm 2 is inserted into the groove 11 in the horizontal direction. Arc start metal fitting 13 placed on metal fitting 12
This technique attempts to improve the welding by reducing the cross-sectional area of the groove at the welding start point. In the above two examples, two wires are usually inserted to weld two surfaces almost simultaneously as shown in the drawings.

Although each of these conventional techniques has its advantages, problems still remain. That is, in the example shown in FIG. 7, if the width t of the protrusion 8 is short, the protrusion 8 will not only cause the bath to fall at the start of welding, making it impossible to weld, but also cause the fallen metal to move horizontally. It flows into the groove 11, making it difficult to weld in the next step. On the other hand, if the width l of the protrusion is long, there is a risk of leaving a large unmelted part in the width l, so it is necessary to ensure a considerable penetration depth in the first step, that is, welding the groove 11. Otherwise, the unfused portions will not be fused.

Next, the same applies to the example shown in FIG.
Needless to say, it is extremely difficult to remove it from the body.

Arc start metal fitting 1 to prevent metal fitting 12 from melting
Increasing the value of 3 is not preferable because it means performing so-called full welding.

Further, a problem common to the above-mentioned examples is the complexity of the shape of the diaphragm 2. The complexity of this shape complicates the gas cutting process for cutting out the diaphragm 2.

Furthermore, as a problem with the general electroslag welding method, there is insufficient penetration of the weld at the welding start point, which is also pointed out in Japanese Patent Publication No. 59-21714. The present inventors focused on the diffusion of heat at the welding start point as one of the causes of the electric spot during this period. That is, it is considered that the amount of heat generated by the arc generated at the welding start part does not work effectively because it is diffused into the metal such as copper or steel applied to the welding start part and produces 7t% molten slag. Therefore, consideration should be given to ensuring that at the welding start point, as much as 6J of heat is used to generate bath molten slag.

(Problems to be solved by the invention) The present invention has been made in view of the above-mentioned problems.
It is an object of the present invention to provide a welding method capable of welding a vertical groove formed by the end face of a box column and a diaphragm inscribed therein without defects such as poor penetration, and which can reduce the number of man-hours in processes before and after welding. It is something to do.

(Means and operations for solving the problems) The gist of the present invention capable of solving the above problems is that the first step in welding a diaphragm to the inner surface of a box pillar is to form a skin plate on four sides constituting the box pillar. In the method of welding a vertical groove formed by the end face of a diaphragm placed on the inner surface of a box column with one side open and the inner surface of the skin plate, the shape of the diaphragm is quadrilateral and the grooves in the horizontal and vertical directions are welded. A method for welding a diaphragm for a box column is characterized in that a refractory is placed within the intersecting horizontal grooves and the vertical grooves are electroslag welded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the method of the present invention, FIG. 2 is a diagram showing an embodiment of welding the remaining two surfaces in the process after welding two surfaces by the method of the present invention, and FIG. 3 is a diagram showing an embodiment of the method of the present invention. FIG. 4 is a side view showing an embodiment of the method of the invention, and a perspective view showing the shape of the refractory for preventing hot water leakage used in the method of the invention.

In Figures 1 and 3, 1α, 16 and 1CVi
02 is a diaphragm; is a weld that is temporarily attached to the diaphragm 2 in advance. After opening the upper part of the diaphragm 2 and inserting it into the box pillar of the tomojo, the abutment 3 and the skin plates lα and 16 and the welding lc are temporarily welded and fixed. As a result, as shown in the figure, two vertical grooves 14 and a horizontal groove 11 are set in a continuous manner.

When welding the grooves set as described above, welding is first performed from the groove 14 in the vertical direction.

15V'i is a refractory soda for preventing hot water from leaking, and is inserted into the horizontal groove 11 through the slit 16 provided in the skin plates 1G and 16, and positioned at the bottom of the vertical groove 14. It is a cut wire for 17fl arc start,
Spray a small amount on the bottom of the groove 14 prior to welding. The cut wire 17 is a small piece of wire with the same thread length as the welding wire, and is used in a manner that allows for smooth arc generation.

When the above preparations are completed, the wire guide nozzle 10 is inserted from the top of the groove, the welding wire 9 is fed into the groove through the nozzle IO, and fI! Start i-contact. At the same time as welding begins, 7 lux for forming a slag bath is introduced, and welding is continued until the level of molten metal reaches the slit 18 at the top of the skin plate 1CL, 16.

It is desirable to weld the vertical grooves 14 on two sides at the same time from the standpoint of reducing welding distortion.

When there is only one worker, it is unavoidable that there will be some time difference.

Electroslag welding is a consumable nozzle type electroslag welding method in which the nozzle IO is consumed.

There is a non-consumable nozzle type electroslag welding method in which the nozzle lO increases with welding, but the method of the present invention can be similarly applied to either method. Figure 4 shows the shape of the refractory, and 15 is a refractory. It is a main body, and 15' is a glass fiber tape provided by wrapping the refractory material. The tape 5'
Even if there are variations in the dimensional accuracy of the groove, it adheres closely to the bottom of the groove 14 and #! Increases the effect of preventing hot water leakage when starting the connection.

If the method of the present invention is carried out using the construction procedure as described above, not only can the arc start be performed smoothly, but also the arc heat can be effectively absorbed into the formation of molten slag due to the heat insulating effect of the refractory 15 installed at the bottom of the groove. As a result, the welding stabilizes immediately after the start of welding, transitions to electroslag welding, and a sound weld can be obtained immediately after the start of welding.

Furthermore, after welding the groove 14, the process can proceed to the other process simply by removing the refractory 15. The refractory 15 is deposited on the bottom of the groove 14, but since it is not made of metal such as copper or iron as in the prior art, it can be easily crushed and removed.

Referring to FIG. 2, a welding step performed subsequent to welding according to the method of the present invention will be explained. After attaching the skin play (1d) serving as a lid to the open part of the upper part of the box column, the entire box column is turned over by 90 degrees and positioned so that the groove 11 is vertical. The bottom of the groove 11 is slightly closed with a refractory 15, the cut wire 17 is introduced from the top, and the wire guide nozzle IO is further inserted into the groove from the top to complete the preparation.

After the preparation is completed, the wire 9 is fed to perform welding, and when the weld metal reaches the upper end of the groove 11, the welding is completed.

By welding groove 11, both sides of the welded part of the previous work are 9°20
is also melted, and grooves 11 and 14 are continuous and fc+? ! Filled with metal fittings, diaphragm 2 and skin plate 1cL,
16+lc+ld becomes an integrated box column.

(Example) Table 1 shows examples of welding conditions when the method of the present invention is carried out.

Two methods were used: a method using a worn nozzle type, and a method using a worn nozzle type.
As a result of the inspection after co-welding, no defects such as poor fusion were observed, and a good welded joint was obtained.

In the non-implemented examples, an example was shown in which zircon porcelain was used as the material for the refractory body, but similar effects could be obtained by using mullite porcelain, cordierite porcelain, high alumina porcelain, etc., which have equivalent fire resistance. .

(Effects of the Invention) As explained above, when the method of the present invention is applied, it is possible to significantly improve efficiency and reduce costs in the manufacturing process of the diaphragm and the process of welding the diaphragm to the box pillar. This will greatly contribute to improving the quality of welded parts.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the uninvented method, Fig. 2 is a diagram showing an embodiment of welding the remaining two surfaces in the process after welding two surfaces by the method of the invention, and Fig. 3 is a diagram showing an embodiment of the uninvented method. Figure 4 is a side view of the figure; Figure 4 is a perspective view of the refractory used in the method of the present invention;
Figure 6 is a perspective view showing the structure of the box column, Figure 6 is a diagram showing the shape of the groove, and Figures 7 and 8 are diagrams showing the conventional method. lα#1b11C, ld...Skin plate, 2...
・Diaphragm, 3... Money, 4.5.6.7...
Welding point, 8... Projection, 9... Wire, 10...
・Wire guide nozzle, 11... Groove, 12... Metal fitting, 13... Arc start fitting, 14... Groove, 15... Refractory, 15'... Glass fiber tape,
16.18...Slit, 17...Cut wire,
19.20...Both ends of the welded part. Agent Patent Attorney Masaaki Aki Sawa Mitsunobu 2 people 7t1 figure 2 figure 7T3 figure π4 figure 7i5 figure piece 6 figure

Claims (1)

[Claims] (1) As the first step in welding the diaphragm to the inner surface of the box column, the diaphragm end face and skin plate are placed on the inner surface of the box column with one side open among the four skin plates that make up the box column. In the method of welding a vertical groove formed with the inner surface, the diaphragm is made into a quadrilateral shape, and a refractory is placed inside the horizontal groove where the horizontal and vertical grooves intersect, and the vertical groove is welded. A box column diaphragm welding method characterized by electroslag welding.