JPH08229687A - Welding method of damping plate - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention can be applied as a welding method for a damping thick plate used for a structure such as a bridge member that requires high quality welding without impairing the welding quality. A method for welding a damping thick plate is provided. [Structure] As a welding pretreatment for a resin-based damping thick plate in which a resin is interposed between a plurality of steel plates, the resin or the inner surface of the steel plate in a region where the resin is thermally affected by welding is mechanically cut and then welded. In the case of fillet welding, the resin end face of the damping thick plate is cut to form, for example, a V-shaped groove, and the groove portion is welded to fill up the resin end portion and then the fillet. Weld.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a resin-based damping thick plate in which a resin is interposed between a plurality of steel plates.

[0002]

2. Description of the Related Art In recent years, attention has been paid to environmental problems, and resin damping plates having a resin interposed between a plurality of steel plates are being applied to structural materials which are required to have soundproofing and damping functions. In order to use this damping plate as a structural material, it is necessary to perform welding.However, if the damping plate is welded as it is, the resin will fluidize due to the heat effect of welding, or gas will be generated due to thermal decomposition. Is known to occur and adversely affect the welding quality.

As a welding technique which does not deteriorate the welding quality, a method of burning and removing the resin in a region which is thermally affected by the welding by a flame such as a gas burner is performed prior to the welding. However, it is difficult to control the area where the resin is removed by this welding method, and it often happens that the area above the target is removed or the resin remains in the removed area.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a method for welding a vibration-damping thick plate that solves the above-mentioned drawbacks of the conventional welding method and does not impair the welding quality.

[0005]

In order to achieve the above object, the present invention provides: (1) Prior to welding a resin-based damping thick plate in which a resin is interposed between a plurality of steel plates, the resin-based damping plate is used. A method for welding a vibration-damping thick plate, characterized in that the resin in a region affected by heat by the welding of the thick plate is mechanically removed by cutting, and then the end portion where the resin is removed by cutting is welded, and (2)
Before fillet welding the end of a resin-based damping plate with resin interposed between multiple thick plates, the steel plate and resin at the welding side end of the damping plate are cut to form a groove. A gist of the method for welding a vibration damping thick plate is characterized in that the resin end is sealed by welding to the groove to seal the resin end, and then the seal end is fillet welded.

[0006]

According to the present invention, the resin in the heat-affected area is mechanically cut and reliably removed before welding, or the resin fluidized by the heat effect of the welding and the gas generated by the thermal decomposition of the resin are removed. In order to prevent it from flowing out to the
It is possible to prevent the occurrence of welding defects such as pits, blow holes, and fusion defects due to the resin. Therefore, according to the present invention, the application of the vibration damping thick plate is promoted even for a structure requiring high quality welding such as a bridge member which cannot be applied to the conventional welding, and the environment such as noise and vibration is promoted. Can contribute to the improvement of the problem.

The inventors of the present invention aim to apply the damping thick plate to a structure such as a bridge which requires a particularly high quality welding, and the starting point is to solve the difficulties when the conventional welding method is applied. The present invention has been developed by studying a welding method having a high suitability as a method for welding a vibration-damping thick plate to such a large-sized structure. In the present invention, the resin in the region which is thermally affected by welding is mechanically removed and then welded. In order to prevent the resin fluidized by the heat effect of welding or the gas generated by the thermal decomposition of the resin from flowing out to the welded part, it is necessary to seal the resin end part that is heat affected by welding with build-up welding before welding. The point is.

When the resin is mechanically removed, if the vibration-damping steel plate becomes thin, the steel plate may be broken and it is difficult to apply. However, what is to be welded in the present invention is a damping thick plate mainly composed of a thick steel plate having a nominal thickness of 3.0 mm or more used for a structural material and a resin having a thickness of 3 mm or less interposed between the thick steel plates, The resin between the thick steel plates can be easily cut and removed by a mechanical means such as a cutter.

When the resin thickness of the damping thick plate is thin, it is difficult to mechanically remove only the resin by cutting, so that the steel plate is also cut at the same time, which may be a structural weak point. Since the cutting thickness of the steel sheet can be grasped in advance by selecting the thickness of the cutter to be used, it is easy to deal with the structural design.

Even if the resin in the heat-affected zone of the vibration-damping thick plate is removed, the range of the heat-affected zone changes depending on changes in conditions such as welding time, and resin or gas flows out during welding, which adversely affects welding. However, in butt welding, since the groove is usually formed and welded, even if the resin flows out during welding, the first layer of welding acts as a seal, causing a critical defect in the welded part. There is no such thing.

However, in fillet welding, it is common to perform two-pass welding from both sides without a groove. Particularly in the case of downward welding, the second pass is caused by the resin fluidized by the welding heat of the first pass. There is a concern that welding defects will occur during welding.
In order to eliminate such a problem, the resin end of the vibration-damping thick plate that is previously affected by the welding heat is prevented so that the resin fluidized by the welding heat and the gas generated by the thermal decomposition of the resin do not flow out to the weld. It is effective to seal.

Various methods are conceivable as a method for sealing the resin end surface portion of the vibration-damping thick plate, but a method of cutting up into a concave shape (including V, Y, U-shapes, etc.) and then overlaying by welding is applied. Excellent in terms of efficiency and economy. In this case, it is necessary to secure the amount of buildup to the extent that the sealing performance is not impaired by the welding heat during fillet welding. It is usually sufficient that the buildup depth from the end surface is about 3 to 10 mm.

If the build-up weld portion has an extra build-up portion and protrudes from the end face, the workability is not impaired.
It is desirable to remove it with a cutter, grinder, etc. and finish the end surface on the welding side flat. Incidentally, when the resin end portion of the region affected by the welding heat is sealed by build-up welding, the resin in the region affected by the welding heat may be removed and placed in advance by the method as described above. Even if it is not removed and placed, it does not adversely affect welding.

[0014]

Embodiment 1 An embodiment of the present invention will be described below with reference to FIGS. The damping thick plate 1 used in this example is a thick steel plate having a nominal thickness of 12.0 mm and a width of 300 mm (general structural steel).
A viscoelastic resin 2 having a thickness of 0.3 mm, a width of 300 mm and a fluidization temperature of 200 ° C. is interposed between 1a and 1b.

Therefore, in this embodiment, 20 is applied during welding.
If the resin in the region of 0 ° C. is removed, the outflow of the resin and the generation of gas due to the thermal decomposition of the resin can be prevented, and the deterioration of the welding quality can be prevented. Since it was confirmed in advance that the area of 200 ° C immediately after welding was 25 mm from the center of the welding line, the removal range of resin 2 was set to 30 mm from the welding line in consideration of safety. The resin was removed by cutting with a cutting device.

As shown in FIG. 1, this cutting device is provided with a table 3 on which the damping thick plate 1 is placed and fixed, a movable body 5 for moving a pedestal 4 on the table, and a movable body 5 arranged on this movable body. It is constituted by a disk-shaped cutter 7 having a diameter of 90 mm and a thickness of 1 mm rotated by a motor 6. Pressing rings 8 having an outer diameter of 30 mm and a thickness of 3 mm are concentrically attached to the upper and lower sides of the cutter 7, and the outer peripheral surface of the ring slides on the end surface of the damping thick plate to a predetermined area (30 mm from the welding line). The resin (and thick steel plate) in the area) can be reliably cut.

With this cutting device, as shown in FIG. 2, the resin 2 between the thick steel plates 1a and 1b is cut and removed over the entire width in the region of 30 mm from the welding line at the weld side end of the damping thick plate, and the slit 9 is formed. And the damping plate 1 having the groove 1o formed thereon and the damping plate 1 ₁ obtained in the same manner are butt-welded together at the slit forming side end as shown in FIG. 3 and butt-welded by CO welding. . Table 1 shows the welding conditions in this case.

[0018]

[Table 1]

The butt-welded portion 10 obtained by this welding was fractured and inspected for the presence of welding defects. As a result, sound welding was possible at this welding portion 10 without any welding defects such as blowholes or fusion defects. It was confirmed. On the other hand, when the vibration damping thick plates having the groove formed without cutting and removing the resin at the ends are butt-welded under the same welding conditions as in Example 1, blowholes are remarkable and fatal. A welding defect has occurred.

[0020]

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the end on the welding side of the damping thick plate is cut to form a V-shaped groove portion, and the end face portion of the resin of the damping thick plate is welded to the groove portion by overlay welding. After sealing, this damping thick plate is fillet welded. The damping thick plate 1 used in this Example 2 has the same fluidization temperature of 0.3 mm in width and 300 mm in width between the thick steel plates 1a and 1b having a nominal thickness of 12.0 mm and a width of 300 mm as in Example 1. 200 ° C
The viscoelastic resin 2 is interposed.

In this embodiment, as shown in FIG. 4, a V-shaped groove 1v having a depth of 6 mm is formed in the entire end portion of the damping thick plate 1 on the welding side by general cutting. As shown in FIG. 5, after overlay welding is performed on the groove portion to seal the resin end portion of the damping thick plate with the overlay portion 11, the excess overlay portion 12 of the overlay portion 11 is generally formed. After the flattening as shown in FIG. 5, the thickness of the damping thick plate 1 is set to 12.
Fillet welding was performed on a 0 mm thick steel plate 13. Table 1 shows the welding conditions.

As a result of breaking the welded portion 14 obtained by this welding and inspecting for the presence of welding defects, slight blowholes were found in the seal welded portion 11 due to the overlay welding, but the sealing function Is not impaired, the outflow of resin and the generation of gas due to thermal decomposition of resin can be prevented, no welding defects are observed in the fillet welded portion 14, and it can be confirmed that extremely sound fillet welding was possible. It was

On the other hand, when the thick resin plate is subjected to fillet welding under the same welding conditions as in Example 2 without cutting and removing the resin at the end of the vibration-damping thick plate, in addition to poor fusion, pits and blows are caused. Holes were noticeable and fatal welding defects occurred. In addition, when the resin at the end of the vibration-damping thick plate is cut and removed in the region of 30 mm from the welding line, and the thick steel plate is then fillet-welded under the same welding conditions as in Example 2, a slight blow hole is generated. Occurrence was observed.

The present invention is not limited to the above Embodiments 1 and 2. In the present invention, within the scope of satisfying the above claims, for example, a region for cutting and removing resin, a sealing region by build-up welding of the end face of resin, depending on the welding target (material, size, shape, etc.), welding conditions, etc. The cutting means, the cutting procedure, the butt welding means, the overlay welding means, the fillet welding means and the like are changed.

[0025]

According to the present invention, the resin in the heat-affected area is surely removed by mechanical cutting and then welded. Or welding defects such as pits, blowholes, fusion defects, etc. due to the resin are welded after sealing the resin end face of the damping thick plate beforehand so that the fluidized resin due to the heat effect of welding does not flow out. Can be prevented. Therefore, according to the present invention, the application of the vibration damping thick plate is promoted even for a structure requiring high quality welding such as a bridge member which cannot be applied to the conventional welding, and the environment such as noise and vibration is promoted. Can contribute to the improvement of the problem.

[Brief description of drawings]

FIG. 1 is a three-dimensional schematic explanatory view showing an example of resin cutting and removing means at an end portion of a damping thick plate in an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional schematic explanatory view showing an example of a damping thick plate before welding in which a resin at an end portion is cut and removed to form a groove in Example 1 of the present invention.

FIG. 3 is a schematic explanatory view of a vertical cross section of a damping thick plate welded by butt welding in Example 1 of the present invention.

FIG. 4 is a schematic vertical cross-sectional explanatory view of a damping thick plate before welding, in which a groove is formed at an end portion and overlay welding is performed in Example 2 of the present invention.

FIG. 5 is a schematic vertical sectional view of a vibration-damping thick plate before welding, in which a groove is formed at an end portion and overlay welding is performed, and then an extra weld portion is cut and finished to be flat in Example 2 of the present invention. Explanatory drawing.

FIG. 6 is a schematic explanatory view of a vertical cross section of a vibration-damping thick plate which is fillet-welded to the thick steel plate in Example 2 of the present invention.

[Explanation of symbols]

1,1 ₁ Damping thick plate 1a, 1b Thick steel plate 1o Groove 1v V-shaped groove 2 Resin 3 Table 4 Frame 5 Moving body 6 Motor 7 Cutter 8 Holding ring 9 Slit 10 Butt welding part 11 Overlay welding part 12 Extra part 13 Thick steel plate 14 Fillet weld

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B32B 15/08 B32B 15/08 D (72) Inventor Tadahiko Mori 20-1 Shintomi, Futtsu-shi, Chiba Shin Nippon Steel Co., Ltd. Technical Development Division (72) Inventor Kameo Hasegawa 2-5-12 Higashikanda, Chiyoda-ku, Tokyo Within Environmental Engineering Co., Ltd. (72) Inami Kiyomi 5-11 Minamikoyasu, Kimitsu City, Chiba Prefecture -8

Claims (2)

[Claims] 1. Prior to welding a resin-based damping thick plate in which a resin is interposed between a plurality of thick steel plates, the resin in a region thermally affected by the welding of the resin-based damping thick plate is mechanically cut. A method for welding a vibration-damping thick plate, which comprises removing and then welding the end portion where the resin has been removed by cutting. 2. Prior to fillet welding the end portion of a resin-based damping thick plate in which resin is interposed between a plurality of thick steel plates, the steel plate and resin at the welding side end of the damping thick plate are cut. A method for welding a vibration-damping thick plate, which comprises forming a groove, overlaying the groove by welding to seal the resin end, and then performing fillet welding on the sealed end.