JP3420181B2 - Groove formation of steel structure One side welding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welded joint member and the overlay welded portion after overlay welding is performed on the back surface of the end face portion of the welded joint member in a building structure, bridge structure, general structure or the like. The groove surface of the welded joint member is extended by the weld overlay after the groove processing of the member, or after the groove processing of the member, the member without using the consumable backing metal or backing material. The present invention relates to a method of a technique of performing joint welding by a one-side welding method in which welding is performed from one side to obtain a throat thickness exceeding a plate thickness and a plate width of a member of a welded joint member end surface portion.

[0002]

2. Description of the Related Art In the prior art, as shown in FIGS. 1 and 2, steel frame welding is standardized with a joint with a backing metal which is applied from one side. In the conventional method, a groove is formed at the end of the member to be joined, and then the backing metal is manufactured and the tacking welding for attaching the backing metal is performed. Therefore, joint welding cannot be carried out immediately after groove processing. Moreover, in the conventional method,
Since the backing metal is left without being removed after welding, a harmful notch remains between the member and the backing metal, resulting in stress concentration. Therefore, it is also a factor causing deterioration of seismic strength. In the conventional method, before the main welding, a welding bead is placed on the back surface of the steel frame diaphragm 1 in the T joint as shown in FIG. 8, or as shown in FIG. 9, the back surface of the steel frame diaphragm 1 in the T joint and the opposing member. The method of placing the weld bead on the groove backside of 2 in advance has been announced, but it is difficult to align the groove due to the dimensional tolerances of the members and the irregularity of the overlay weld bead, and there are restrictions on the welding position to obtain stable backside welding. There is a problem in workability. Also, unlike the peripheral welding of square pipes and round pipes where the welding start point and end point overlap, when welding the end of the flange of H-section steel, the flange width becomes a finite width,
In order to obtain a good weld having no defects at the start end and the end of the welding, the conventional method requires a steel end tab as shown in FIG. 14, which requires a large manufacturing cost and a lot of man-hours for mounting the end tab. Recently, the use of ceramic end tabs instead of steel end tabs has been increasing, but in this case as well, expensive ceramic manufacturing costs and mounting work are required.

[0003]

According to the conventional method, as shown in FIG. 1, there are two recessed corners 1R and 2R at the root of the groove 5 where the members 1 and 2 contact the backing metal. This part is less likely to melt and cause a defective penetration, and as shown in FIGS. 1 and 2, after processing the groove 5, the backing metal 3 is manufactured and the tacking welding for mounting the backing metal is performed. 4 is required, and the manufacturing man-hours are large in terms of joint welding efficiency, and since the backing metal 3 is left in the subsequent joint welding 6, the temporary welding 4 remains and the backing metal 3 and the base metal are left. Hazardous notches 7 and 7A that cause stress concentration between 1 and 2 remain, which is a factor that hinders joint performance such as bending ductility / fatigue strength and seismic strength. Further, in the conventional method shown in FIGS. 1 and 2, after the groove processing of the end face portion of the member to be joined is performed, the backing metal 3 is manufactured and the temporary welding 4 for attaching the backing metal is required. Since the welding 6 of the joint cannot be immediately started, there is a disadvantage that the man-hours for manufacturing the steel frame are large in view of the procedure of the manufacturing process. Further, in the conventional technique, if the backing metal 3 is omitted, it is necessary to perform the back bead welding to make a bead having a regular wave without defects from the front side of the groove on the back surface of the first layer, but in the steel frame manufacturing, the material is used. Difficulty in maintaining the groove precision due to the dimensional accuracy of
This is difficult to achieve because it is difficult to secure Uranami welding skills and to use large current from the first layer. Also,
Although it is possible to use a consumable backing material in order to form a favorable back bead, there is a problem in this method that the consumable backing material is expensive and a work of mounting and dismounting is required. There is also a problem that the consumable backing material cannot be removed after welding in the case where the inside is a closed space like the joint of the building steel frame shown in FIG. On the other hand, like the construction method of FIG. 8, after the overlay welding 13 is previously placed on the member 1 which is not the end face of the T-joint, the member 2 is applied and the welding 14 of the first layer is applied from the front side of the groove. Perform, and then weld the joint 6
There is a way to do. This method has the convenience that the backing metal can be omitted, but since the position of the build-up welding 13 is determined beforehand in addition to the unevenness of the wave of the build-up welding bead, the dimensional accuracy of the members is not uniform. It is not easy to adjust and change the position, it is difficult to perform the welding unless the welding posture is horizontal, the member 1 in FIG. 8 requires a certain inclination for forming the back bead, and the first layer from the back surface Welding 14 requires skill and large current cannot be used, throat thickness 2A
There is a problem such as not leading to an increase in As shown in FIG. 9, the weld overlay beads 13 and 13A are previously placed on the end face member 2 in addition to the member 1 which is not the end face of the T-joint, and the member 2 is applied to the first layer from the front side of the groove. There is a method in which the welding 14 is performed and then the joint welding 6 is performed. This method also has the convenience of omitting the backing metal, but has the same problem as in FIG. Furthermore, the welding at the time of overlay welding to the tip of the member 13A of FIG. 9 is not easy, and furthermore, it is necessary to place overlay welding on both members of the T joint in advance. Compared with overlay welding using a backing material that does not melt only for the end face members, there are problems of difficulty in welding work and increase in manufacturing man-hours. Also, the end tabs are used to weld the finite length of the flange of the H-section steel with a finite width to obtain the soundness of the start end and the end of the flange. However, the manufacturing cost and the installation cost of the end tabs are required. Therefore, an inexpensive and easy construction method that omits this end tab is desired.

[0004]

[Objective] The present invention is to reduce the manufacturing man-hours in view of the above-mentioned joint welding efficiency, reduce the steel frame man-hours in terms of manufacturing process procedures, improve the ease of position adjustment between joint members, and improve welding workability. Greater throat thickness and elimination of factors that impede joint performance due to residual deleterious notches that cause stress concentrations between the backing or end tabs and the base metal are greater than those formed by the joint members themselves. The purpose is to achieve by forming a groove surface.

[0005]

[Means for Solving the Problems] In order to solve these problems, the corners of the root portions of 1R and 2R in FIG. 1 are eliminated, and the production of the backing metal and the tack welding for the production man-hours are omitted. At the same time, it is necessary to eliminate harmful notches and increase the throat thickness. Therefore, in the method according to the invention of claim 1, without using a backing metal or a backing material remaining in the joint after welding,
As shown in FIG. 3, a metal or non-metal backing material 8 that is not melted by a welding heat source such as arc heat is provided on the end surface 2T of the T-type welded joint member before groove processing or one or both end surfaces of the butt jointed member. Application, overlay welding is performed in a predetermined shape between the back surface of the weld joint end face and the metal to increase the plate thickness of the end face of the member, and then the weld joint end face member including the weld weld metal is opened. Perform the pre-processing so that they are on the same surface, and then
The weld joint members are weld-joined to each other while the joint members are opposed to each other while melting the groove surface of the overlay weld metal from the front side of the groove, and a throat thickness exceeding the plate thickness of the member at the end face of the weld joint is secured. Weld one side. In the method according to the present invention according to claim 1, in the construction of the T-type welded joint and the butt joint, the tip end of the joint member end surface portion groove-processed after overlay welding is set in contact with a predetermined position of the mating member. Since the joint welding can be performed directly from the groove to the groove processed portion, the backing metal can be omitted, the ease of setting the member 2 can be obtained, and the back surface overlay welding portion supports the back surface from the first layer. A large current can be used for the eyes, and because of the deep groove without backing metal, good penetration of the member roots 1R and 2R can be easily obtained. 2G can be reduced to about 50% compared to about 7 mm when using a backing metal and the groove cross-sectional area can be reduced, so the amount of weld metal in the joint can be reduced and the welding time and welding strain can be reduced. Can be made, and by the combination of these effects Reduction of steel fabrication steps from defect prevention and joint welding surface of the member root portion can be made greatly, it is possible to secure the steel dimensional accuracy. Further, in the method according to the present invention of claim 1, by supporting from the back surface of the overlay welding portion, as shown in FIGS.
As in the above example, the welding posture for performing stable back-side welding in terms of welding workability is not limited to the lateral direction, and stable welding can be performed in all postures as in ordinary joint welding. At the same time, by omitting the offline work process of manufacturing and mounting the backing metal after the groove processing and performing overlay welding before the groove processing, many joint welding can be started continuously from the groove processing. Therefore, it is possible to significantly reduce the number of steel frame manufacturing steps from the viewpoint of the manufacturing process. Further, in the method according to the present invention,
Even if the notch 7 of the conventional method is eliminated and the notch corresponding to the notch 7A is present, the throat thickness can be increased so that the notch is not harmful and the joint bending ductility and fatigue strength are improved, and the seismic resistance is improved. The strength can be easily secured. According to the experiment, if the increase in throat thickness is 10% or more, the bending ductility of the joint is improved about twice and the fatigue strength is improved about 10 times. Further, in the method according to the invention of claim 2, instead of using the backing material which is not melted by the welding heat source such as arc heat in the method according to the invention of claim 1, FIGS.
As shown in A, after the build-up welding of a predetermined shape is performed in advance on the back surface of the groove processing planned portion which becomes the end of the joint member, both the member of the groove planned portion and the build-up weld metal are the same as the member surface. Since the groove is cut at a predetermined angle and a predetermined groove is formed, a joint end surface before joint welding similar to that of claim 1 as shown in FIG. 4 can be obtained. Thereafter, the joint end members are opposed to each other and the weld joint members are welded and joined together while melting the build-up weld metal groove face from the front side of the groove, and the throat thickness exceeding the plate thickness of the member of the weld joint end face portion is applied. Make one-sided welding to secure. In the method according to the present invention of claim 2, since the groove shape before welding and the joint shape at the time of completion of welding can be obtained, which are similar to those of the method according to the invention of claim 1,
Similar to the method according to the invention of (1), the welding workability can be reduced, the number of man-hours for manufacturing a steel frame can be reduced, and good joint performance can be secured. In the method according to the present invention of claim 3, the welding start point and the welding end point do not overlap with each other as in the case of circumferential welding of a square pipe or a round pipe.
When the welding is applied to the flange of the shape steel, the steel plate has a finite width, and when the welding work by the conventional backing metal attachment or the method of claim 1 or 2 is applied, the start end and the end of the weld are not defective. The present invention provides a means for omitting the need for an end tab as shown in FIG. 14 and an alternative ceramic end tab in order to obtain a good welding quality. The method according to the present invention according to claim 3 is the method according to claim 1, wherein overlay welding is performed between the back surface of the end surface portion of the steel plate welded joint member having a finite width and the backing material, or Two
In the method described in 1), when overlay welding is performed on the back surface of the groove processing scheduled portion which is the end of the steel plate joint member of finite width,
5, FIG. 15A, FIG. 16, FIG. 16A, FIG. 18 or FIG. 18A
After overlay welding including the steel plate side surface as shown in FIG.
Alternatively, as shown in FIG. 17A, groove processing of a welded joint end face member including the build-up weld metal of the steel plate back surface portion and side surface portion is performed to form a groove surface larger than that formed by the joint member itself, Thereafter, as shown in FIG. 5, the joint members are opposed to each other, and the groove surface including the overlay weld metal from the front side of the groove.
While welding 10, weld joint members are welded together, and the throat thickness in the plate thickness direction exceeding the plate thickness of the members of the weld joint end face or the throat thickness in the plate width direction exceeding the plate width or the plate thickness / width direction This is a one-side welding method that secures a throat thickness that exceeds each throat thickness. That is, according to the present invention, after welding the joint, as compared to a conventional backing type joint such as 7 and 7A of FIG. 2 or FIG.
There is no stress concentration due to harmful notch like 25A of 4,
It is possible to increase the plate thickness and the plate width in the cross section of the joint, increase the in-plane tensile strength of the joint, and increase the bending strength / bending ductility / fatigue strength of the joint in the plate thickness direction and the plate width direction. Further, it becomes possible to omit a steel end tab as shown in FIG. 14 and a ceramic end tab as an alternative thereto. Note that the ceramic end tabs may easily cause welding defects, and the construction method according to the present invention is also effective in this respect. In the method according to the invention of claim 4, when the overlay welding according to the method of claim 1 or 3 is performed, the non-melting type backing material and the overlay welding metal are not well compatible with each other and the non-melting type backing material is used. When it is necessary to perform a large overlay welding to obtain the specified leg length on the material side, improve the familiarity between the non-melting type backing material and the overlay welding metal, and secure both sides of the overlay welding part. The present invention relates to a method of forming a build-up weld bead shape that is gentle between ends. The method according to the invention of claim 4 is the method according to claim 1.
1 or 2 when overlay welding according to the method described in 3 is performed.
As shown in FIG. 9, a thin steel plate 29 of the same material as the overlay welding metal or the weld joint member is brought into close contact with the overlay welding side of the non-melting type backing material in advance, and as shown in FIG. Material 8 and member 2
Is a method of performing overlay welding 9 between the thin steel plate 29 and
Has an effect of pulling the molten metal toward the thin steel sheet side, that is, the direction of the non-melting type backing material by surface tension when partially melted during overlay welding, and the gentle meat from the non-melting type backing material 8 to the member 2 It is effective to obtain the welded bead shape 9. With this gentle build-up weld bead shape 9, the maximum build-up weld leg length on the non-melting backing material side can be obtained with the minimum build-up amount. As described above, the thin steel sheet is useful for smoothly forming the shape of the overlay metal when it melts, and the thickness of the thin steel sheet is 3 m in consideration of penetration at the time of welding, economy, and groove processing in the subsequent process.
m or less was appropriate and matched. The method according to the invention of claim 5 is
When the groove processing is performed before the overlay welding due to the manufacturing process such as outsourced processing, the invention according to claim 1 cannot be carried out. Therefore, the non-melting type backing is applied to the end surface member that has been groove processed first. A method for increasing the groove area formed by an end face member by overlay welding using a material.
The method according to the invention of claim 5 is, in a steel structure, as shown in FIG. 24, welding of arc heat or the like to an end face of a T-type welded joint member or one or both end faces of a butt joint member which has been groove-processed in advance as shown in FIG. Apply backing material 8 that does not melt by heat source,
After overlay welding 9 is performed between the backing material and the back surface including the back surface or the side surface of the end face portion of the welded joint member, a part 33 of the backing material contact surface of the overlay welding metal 9 is main body As an extension of the member joint groove 32, the joint members are then opposed to each other as shown in FIG. 5, and the weld joint members are welded and joined from the front side of the groove while melting the build-up weld metal groove face. As shown in 6, secure a throat thickness in the plate thickness direction that exceeds the plate thickness of the member at the end face of the welded joint, or a throat thickness in the plate width direction that exceeds the plate width, or a throat thickness that exceeds both the throat thickness in both the plate thickness and the plate width direction. This is a one-sided welding method. Compared to claim 1, the method according to the present invention is such that a part 33 of the backing material contact surface of the overlay welding metal 9 is easily displaced from the main body member joint groove surface 32, and joint welding is performed from groove processing. However, it is effective as an alternative to the invention according to claim 1 for joint welding of end faces that have already been groove-processed, though there is a drawback that it is not possible to perform consistent construction leading to. In FIG. 24, a part of the vertical surface of the non-melting type backing material 31
Is provided so that the weld overlay metal is brought into contact with the die groove of the mating member and is positioned for positioning the member 2 in the left-right axial direction. Since the method according to the present invention is carried out in the same manner as in claim 1, it has many advantages as described above by compensating for the drawbacks of the conventional method, and is backed only by the known diaphragm member 1 of FIG. The method is different from the method of overlay welding without a material, and the method is also different from the method of overlay welding without a backing material on both members in FIG.

This is a method capable of solving the above-mentioned problems of the section and achieving part of the effect of claim 1. Furthermore, the present invention according to claim 5 is effective in obtaining a gentle build-up shape if it is constructed in combination with claim 4.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of conventional steel frame welding. The member 1 and the member 2 groove-processed at 35 degrees are welded and joined by a T-joint, but in order to make the welding stable and completely melt from one side, the backing metal 3 is applied from the back side and tack welding 4 is performed. Then, as shown in FIG. 2, joint welding 6 is performed. However, in this case, as shown in FIG. 2, a tack welding 4 for attaching the backing plate 3 to the members 1 and 2 is required prior to the joint welding. Such work consumes many man-hours such as manufacturing the backing plate 3, setting the backing plate 3, and tack welding the backing plate. In addition, this backing plate must be attached in the process between the processing of the groove 5 and the welding 6 of the joint, and the backing plate attachment must be done offline. Smooth distribution is hindered and the process becomes inefficient. Moreover, in the conventional method, after welding is completed, there are unwelded portions 7 and 7A between the backing metal 3 and the members 1 and 2 as shown in FIG. It is a source of stress concentration when a load is applied. In the experiment, when the member 2 was subjected to an upward bending load 2B in the joint type shown in FIG. 2, a crack was generated in the notch 7 or 7A, which is almost harmful, and the joint was broken.

Therefore, as shown in FIG. 3, a non-metal backing material 8 or a water-cooled or non-water-cooled copper backing material 8 which is not melt-damaged by a welding heat source is applied to the end portion of the member 2, and the end surface portion of the welded joint member is applied. The overlay welding 9 is performed between the back surface of the 2T and the backing material, and the edge of the member is groove-processed including the overlay welding as shown in FIG. 4, and the mating member surface is formed as shown in FIG. Matching, Figure 6
If the joint welding is performed as described above, the various operations associated with the attachment of the backing metal described above are eliminated, and a consistent and continuous work from the groove processing to the joint welding becomes possible. Therefore, the backing metal can be omitted, the member 2 can be easily set, a large current can be used in the first layer, and the dimensional accuracy of the steel frame can be ensured. You can At the same time, since the off-line work process of manufacturing and mounting the backing metal after groove processing can be omitted, many joint welding can be performed continuously,
It is possible to significantly reduce the number of man-hours for manufacturing a steel frame in terms of the manufacturing process procedure. Further, in the method according to the present invention, harmful notches can be eliminated, the throat thickness can be increased, and the dimensional accuracy of the steel frame can be secured. Therefore, bending ductility, fatigue strength, and seismic strength can be easily secured. By significantly reducing the steel frame manufacturing man-hours by improving the efficiency of the joint welding efficiency surface and the efficiency of the manufacturing process procedure surface, in the actual work, even if the man-hours of overlay welding according to the present invention are included, the average plate thickness About 3 for a 25 mm joint
It has become possible to reduce the manufacturing man-hours by 0%. Further, in FIG. 6, the throat thickness of the joint is 2A when there is no overlay welding 9, but it is obtained by performing the main welding on the groove portion including the overlay welding portion integrated with the base metal. If the joint throat thickness 1A is called the throat thickness according to the present invention, the welding throat according to the present invention increases the throat thickness of the joint portion from 2A to 1A. According to the experiment, in the conventional joint shown in FIG. 2, when the bending angle of the member 2 is 15 to 25 degrees, a crack is generated from the root portion, and in the construction according to the present invention, the welding material of the same material as the member 1 is used. If the increase in throat thickness of the welded joint obtained by using
Even when the upward bending load 2B was applied to the member 2, the crack generation angle of the member 2 was 50 degrees or more, almost no crack generation was observed, and the member 2 was only bent. That is, since there is an increase in throat thickness in the joint according to the present invention, the joint weld 6 of FIG.
It is shown that the presence of some unwelded parts in the root part 9B of Fig. 3 does not act as a detrimental factor of stress concentration. In addition, the root portion 9B of the joint welded portion according to the present invention is used to perform back-side welding by horizontal welding when the rigidity is low such as when the member 1 is thinner than the member 2, and further, like the H-shaped steel flange, is externally welded. If it is exposed, the stress concentration part can be eliminated by additional welding to the root part 9B or finishing with a grinder.
This makes it possible to further improve the fatigue strength of the joint.

Embodiment 1 FIGS. 6 and 7 show an example according to the invention of claim 1. FIG. 6 shows an example of application to a normal T-joint.
Fig. 1 shows an example of a sectional view of a joint between a square pipe column and a diaphragm, such as in a building steel joint. In the conventional method, since the backing metal is attached to the inner periphery of the square pipe 11 to weld the joint,
It is necessary to remove the square pipe vertical joint for attaching the backing metal, which requires time and labor for manufacturing the pillar backing metal, aligning the members with each other, and tack welding. In the method according to the invention, since the overlay welding 9 is performed on the end face of the square pipe in advance, it is easy to adjust the position of the square pipe 11 with respect to the diaphragm 12 only by applying the square pipe 11 to the diaphragm 12, and the square pipe 11 and the diaphragm 12 It is not necessary to adjust the gap between them and tack welding, and joint welding 6 can be performed immediately regardless of the welding position. Although FIG. 7 is applied to a square pipe, it can be similarly applied to a round pipe.

Embodiment 2 FIG. 10B shows an embodiment of the invention according to claim 2. In the method according to the invention of claim 2, the build-up welding 9 having a predetermined shape is normally pre-formed on the back surface of the groove processing scheduled portion 15A which is the end portion of the joint member in 1 to 3 passes.
This is an example in which the build-up welding is performed in two passes to obtain a surplus larger than that in the one-pass build-up, and then both the member of the planned groove and the build-up weld metal are cut at the same angle as the mating member surface. After cutting as in this example, as in the invention according to claim 1, as shown in FIG. 4, groove processing is performed including the overlay welding metal. Also,
In FIG. 10C, after overlay welding of two passes larger than one pass is performed, cutting is performed at the same angle as the groove angle of the planned groove portion, and the cut surface is directly used as the groove surface. In this way, if the overlay welding of two passes is performed, a larger groove can be obtained than in the case of one pass. After that, in the example of the T-joint, joint welding is performed as shown in FIG. Incidentally, the dimension 15A of the portion to be grooved which is the end of the joint member in FIGS. 10, 10A, 10B and 10C is usually 0 to 500 mm.

Embodiment 3 FIG. 11 is a sectional view showing an example of the conventional method of assembling a butt joint of a vertically standing square pipe or round pipe column. Since it is difficult to align the skin of pipes and to adjust the groove gap, in this example, one backing metal
18 and the stopper 19 are used to insert the backing metal 18 temporarily attached to the upper member 16 into the lower member 17 with a seal, so that the backing metal 18 is vertically aligned and the length and length of the backing metal 18 and the stopper 19 are adjusted.
The groove gap is adjusted depending on the vertical position of. In this conventional method, it is difficult to make adjustments due to variations in the product dimensional accuracy of the pipe, in addition to the number of assembly steps required to manufacture and accurately attach the backing plate and stopper. FIG. 12 shows a cross-sectional view of an example of assembling a butt joint of a vertically erected square pipe or round pipe column in the method according to claim 1, 2, 4 or 5. As is apparent from FIG. 12, even if there is some misalignment between the two members, the gaps and gaps between the members can be kept constant simply by bringing the two members into contact with each other. As shown in FIG. It is possible to easily secure a throat thickness that exceeds the thickness of the melted member and the plate. In this case, the build-up welding 22 in FIG. 13 can be reduced or omitted if only the throat thickness such as the member plate thickness is stably secured. In addition, this construction example can be easily applied not only to construction but also to stable welding construction from the outside or inside of pipelines and pen stocks, and is effective in securing the strength and quality of the joints and reducing the manufacturing man-hours. is there.

Embodiment 4 FIG. 25 shows a diaphragm 12 for a building steel frame joint portion according to a conventional method.
And square pipe column 11 joint, and the diaphragm 12 and H
An example of a joint with the shaped steel flange 26 is shown. Back joints and tack welding are often used for all joints. In FIG.
The case where joint welding 6 is applied to the same joint as No. 5 in the method according to claim 1, 2, 4, or 5 of the present invention is shown. In FIG. 26, when welding the diaphragm 12 and the square pipe 11, the invention according to claim 1, 2, or 5 is applied, and there is no backing metal and tack welding, and there is shown a situation in which there is no deep penetration and no harmful notch. ing. Further, in FIG. 25, a scallop, a backing metal and tack welding which are large openings are shown in the joint between the diaphragm 12 and the H-shaped steel flange 26, but in FIG. 26, the diaphragm 12 and the H-shaped steel flange 26 are shown. In the joint with and, the state immediately before the overlay welding 9 is performed by the method according to the invention of claim 1, 2, 4 or 5 and the joint welding 6 is performed is shown, and the dotted line shows the joint of the joint portion. Shown is weld 6 and welded portion 27A of a non-scalloped web. In this case, FIG. 26 shows a state in which there is no backing metal and tack welding for its attachment, there is no deep penetration and harmful notches, and there is no scallop. Therefore, according to the method of the present invention, the joint portion of the H-shaped steel beam of the steel frame joint portion can be easily constructed by the non-scallop method. In the example of the conventional method shown in FIG. 25, if the scallops are eliminated, the backing metal is divided into two parts on both sides of the web 27, and two special devices are required. In the embodiment according to the present invention, the backing metal and the scallops are not used. It is unnecessary and is excellent in terms of safety of joints and reduction of manufacturing man-hours.

Example 5 In the method according to claims 1 to 4 of the present invention, as a welding material used for the weld overlay 9 constructed between the non-melting type backing material 8 and the joint end face member 2 shown in FIG. , If a welding material having a lower strength than the joint end surface member 2 is used, the tensile strength of the joint weld 6 is secured and the stress concentration is relaxed by the dispersion of plastic strain, improving the bending ductility and fatigue strength of the weld joint. Was even more useful.

Example 6 In the method according to claims 1 to 4 of the present invention, as shown in FIG. 6, the welded joint members 1 and 2 are welded while melting the build-up weld metal groove face 10 from the front side of the groove. In the case of using a welding material having a lower strength than the welded joint members 1 and 2 for welding the root portion of the welded joint, that is, the first layer, cracking susceptibility in the rooted portion can be alleviated. If a welding material having a higher strength than that of the welded joint member was used, the strength of the root portion was improved, and both were more effective in improving the bending ductility and fatigue strength of the welded joint.

Embodiment 7 In the method according to claims 1 to 5 of the present invention, when the groove is machined together with the welding member 2 and the overlay welding 9 as shown in FIG. 27 , the groove machined surface 10 is not flat, 1 on groove bottom 34
When the groove was processed so as to form a curved surface having a radius of curvature of 5 mm to 5 mm, it was effective that the groove bottom portion 34 was expanded and a deep penetration at the root portion of the joint welding 6 shown in FIG. 6 could be obtained more easily.

[0016]

The effects of the present invention are as follows in comparison with the conventional method. 1 Backing metal and its tack welding, which tend to cause stress concentration and welding defects and reduce welding efficiency, are unnecessary. 2 Since the throat thickness can be made larger than the member plate thickness, harmful notches and stress concentration due to the use of backing metal are effectively eliminated.
It is a safer joint in terms of bending ductility, fatigue strength and earthquake resistance. 3 Since there is no backing metal, the groove depth is large, and deep penetration can be obtained, defects in the root portion are unlikely to occur, and the groove cross-sectional area is also reduced by approximately 20%, greatly reducing welding man-hours. It 4 By simply applying the overlay welding member 2 to the end portion of the member 1, the attachment can be easily aligned and the dimensional accuracy can be easily ensured. 5 The backing material such as copper for overlay welding is a non-melting type and non-consumable type, and waste of resources is small. 6 With the construction method according to the present invention, in which the weld overlay is performed and then the groove is processed together with the member to carry out the joint welding, various operations associated with the attachment of the backing metal are eliminated, and the process from the groove processing to the joint welding is consistent. Continuous work is possible, and the number of man-hours for manufacturing steel frames can be significantly reduced by improving the efficiency of joint welding efficiency and the efficiency of manufacturing process procedures. 7. Since the groove welding is performed together with the member after the overlay welding is performed, the groove surface including the member and the overlay welded portion can be obtained with high accuracy, which is effective in preventing defects in joint welding. 8 When the overlay welding is performed on the back and side of the steel plate and the groove is processed including the overlay welded part, the end tab is not required,
At the same time, the throat thickness in the plate thickness direction exceeding the plate thickness of the member or the throat thickness in the plate width direction exceeding the member plate width or the throat thickness exceeding each of the plate thickness and the plate width is secured respectively, and the tensile strength, bending strength, and
Fatigue strength can be improved. 9 Apply a thin steel plate in close contact with the non-melting type backing material, and perform a weld overlay between the non-melting type backing sheet / sheet and a member such as a flange to obtain a smoother weld weld bead. It is possible to improve efficiency such as reducing the amount of weld deposit. 10 In the conventional method, it was necessary to remove the vertical seam weld bead on the inner surface of the square pipe in order to attach the backing metal to the inner surface of the square pipe, but in the overlay welding according to the present invention, the vertical seam weld bead of the square pipe or the like is used. Is unnecessary, and is effective in reducing man-hours. 11 It can be easily applied to the non-scallop method with high earthquake resistance.

[Brief description of drawings]

FIG. 1 is an example of a cross-sectional view of a conventional joint shape before performing one-sided welding.

FIG. 2 is an example of a cross-sectional view of a conventional joint after performing one-sided welding.

FIG. 3 is an example of a cross-sectional view in which a water-cooled or non-water-cooled copper mold is applied to the end of the member and overlay welding is applied.

FIG. 4 is a cross-sectional view showing a state in which overlay welding is performed on a member end portion and both the member end portion and the overlay welding portion are groove-processed, and the member 2 is shown upside down from FIG.

FIG. 5 is a cross-sectional view of a state in which overlay welding and groove processing are applied to the end of the member and the member is applied to the mating member.

FIG. 6 is a cross-sectional view showing a state in which overlay welding and groove processing are applied to the end portion of the member, and the other member is applied and welded.

FIG. 7 is a sectional view of a steel frame welding example according to the present invention in which a square pipe column is welded to a diaphragm.

FIG. 8 is a cross-sectional view showing a one-sided welding method in which overlay welding is performed in advance on a back surface of a planned joint portion on the surface of a member such as a diaphragm of a T-joint, and both members of the T-joint are backside welded from one side.

[FIG. 9] One-side welding method in which overlay welding is performed on both the back surface of a planned joint portion of the surface of a member such as a diaphragm of a T-joint and the rear surface of a joint end surface portion that has been grooved, and then both members of the T-joint are backside welded from one side FIG.

FIG. 10 is a cross-sectional view in which the member and the overlay welding portion are cut together by performing one-pass overlay welding on the intended groove portion of the member.

FIG. 10A is a cross-sectional view in which the member and the overlay welding portion are groove-processed by one-pass overlay welding on the intended groove portion.

FIG. 10B is a cross-sectional view in which the member and the overlay welding portion are cut together by two-pass overlay welding on the intended groove portion of the member.

FIG. 10C is a cross-sectional view in which the member and the overlay welding portion are groove-processed by two-pass overlay welding on the intended groove portion of the member.

FIG. 11 is a cross-sectional view of an example of assembling a butt joint of a vertically erected square pipe or round pipe column by a conventional method.

FIG. 12 is a cross-sectional view of an example of an assembly according to the present invention of a butt joint of a vertically erected square pipe or round pipe column.

FIG. 13 is a sectional view of an example of welding work according to the present invention for a butt joint of a vertically erected square pipe or round pipe column.

[Fig. 14] Example of installation of end tabs by conventional method for column-beam joints

FIG. 15 is a construction drawing of build-up welding between the back and side surfaces of the end face portion of a steel plate welded joint member having a finite width and the non-melting type backing metal.

[Fig. 15A] Construction drawing for overlay welding between the back surface and the side surface of the end face portion of the steel plate welded joint member of finite width and the two non-melting type backing plates 8

FIG. 16 is an external view of a steel plate welded joint member having a finite width after the overlay welding is performed between the back surface and the side surface of the end surface portion and the non-melting type backing metal.

FIG. 16A is an external view of a H-shaped steel flange welded joint member having a finite width and the back surface and side surface of the end surface portion and a non-melting back metal after overlay welding.

FIG. 17 is a plan view showing a case in which overlay welding is performed between the back surface and the side surface of the end surface portion of the steel plate welded joint member having a finite width and the non-melting type backing metal,
Appearance diagram when groove processing is performed

FIG. 17A is an external view of a case in which groove welding is performed after overlay welding is performed between the back surface and the side surface of the flange welded joint member end face portion of finite width and the non-melting type backing metal.

[Fig. 18] Build-up welding situation on planned part of steel plate welded joint with finite width

FIG. 18A: Situation of overlay welding on planned finite width steel plate welded joint using non-melting type backing material

FIG. 19 shows a situation in which a thin steel plate is applied to the overlay welding side of a non-melting backing material and set together with the member 2.

FIG. 20 shows a situation in which a thin steel plate is applied to the overlay welding side of a non-melting backing material and overlay welding is performed together with the member 2.

FIG. 21: After applying a thin steel sheet to the overlay welding side of the non-melting backing material and overlay welding with the member 2, the non-melting type backing material is removed to form a groove including the overlay welding portion. Sectional view showing the processing position for

FIG. 22 is a schematic diagram showing a case where a thin steel plate is applied to the overlay welding side of the non-melting backing material and overlay welding is performed together with the member 2, and then the non-melting type backing material is removed, and the groove is welded including the overlay welding portion. Cross section

FIG. 23 is a cross-sectional view in which a thin steel plate is applied to the overlay welding side of a non-melting backing material, overlay welding is performed together with the member 2, groove welding is performed including the overlay welding portion, and joint welding is performed.

FIG. 24 is a cross-sectional view showing that a non-melting type backing material is applied to the end surface of a joint member subjected to groove processing by overlay welding.

FIG. 25: Example of welded portion of pillar / diaphragm and diaphragm / beam of building joint of conventional method

FIG. 26 is an example of a pillar / diaphragm and a diaphragm / beam weld of a building joint according to the present invention.

FIG. 27 is a cross-sectional view showing a state in which a welded portion is welded to an end portion of the member and both the end portion of the member and the welded weld portion are groove-processed with a curved surface.

[Explanation of symbols]

1 joining welding member, for example, a column of a building steel frame or a diaphragm of a joint portion 1A Throat thickness of joint welding 6 in FIG. 2 Welding member 2A scheduled to be grooved or performed 2A Plate thickness t of member 2 and Throat thickness 2B of joint welding in Fig. 2B Upward load or bending moment 2G T-type weld groove gap 2T at the back surface position of T-type welded joint member 2 End surface of groove of T-type welded joint member 2 2H H-type steel member Web part 3 Backing plate 4 Temporary welding of backing plate 5 Groove 6 Joint welding 7 End face of T joint Stress concentrating part due to notch on member side 7A Stress concentrating part due to notch on member surface side of T joint 8 Welding heat source Non-melting type backing material that is not melted by. For example, water-cooled or non-water-cooled copper backing metal, or carbon plate 9 build-up welding 9B root portion 10 groove end processed surface of joint end face member and build-up welded portion 11 square pipe column 12 diaphragm 13 Overlay welding 13A on the surface of the member of the T-joint. Overlay welding 14A on the surface of the end face of the T-joint. Surface 15A cut together and groove planned to be the end of joint member 16 Upper member of square pipe column or round pipe column 17 Lower member of square pipe column or round pipe column 18 Upper backing plate 19 of conventional method Conventional method Lower stopper 20 of the upper backing metal attached to the upper member 21 tack welding of the lower stopper 19 attached to the lower member 22 weld overlay 23 before the groove processing on the upper member 23 lower member Open to Weld build-up performed before processing 24 Horizontal joint welding 25 End tab 25A Notch 26 caused by gap between member and end tab H-shaped steel flange 27 H-shaped steel web 27A Non-scalloped welded portion 28 Scallop 28A Column / web scalloped weld 29 Thin steel plate 30 Groove processing line 31 Vertical surface formed on part of non-melting type backing material 32 Groove formed on member 33 Part of non-melting type backing material contact surface of overlay welding metal 34 Groove bottom

Claims (5)

(57) [Claims] 1. In a steel structure, a backing material that is not melted by a welding heat source is applied to an end surface of a T-type welded joint member or one or both end surfaces of a butt jointed member, and the back surface of the end surface portion of the welded joint member and the backing material. After performing the overlay welding between and, the groove processing of the weld joint end face member including the overlay welding metal is performed,
Then, the welded joint members are welded together while melting the build-up weld metal groove face from the front side of the groove by facing the joint member, and in the plate thickness direction exceeding the plate thickness of the member of the weld joint end face portion. One side welding method to secure the throat thickness. 2. The method according to claim 1, wherein, instead of using a backing material that is not melted by a welding heat source, overlay welding is performed on the rear surface of the groove processing scheduled portion that is the end of the joint member,
The member of the planned groove and the build-up weld metal are cut together to perform the groove processing, and thereafter, the joint members are opposed to each other to weld the build-up weld metal groove surface from the front side of the groove while melting. A one-side welding method in which joint members are weld-joined to each other to secure a throat thickness in the plate thickness direction that exceeds the plate thickness of the members at the end faces of the welded joint. 3. The method according to claim 1, wherein overlay welding is performed between the back surface of the end face portion of the steel plate welded joint member having a finite width and the backing material, or in the method according to claim 2. When overlay welding is to be performed on the rear surface of the groove processing scheduled part that is the end of the steel plate joint member of finite width, after overlay welding including the steel sheet side surface, the overlay welding metal of the steel plate back surface portion and the side surface portion is Including the weld joint end face member groove processing, after that, the welding member is welded and joined together while facing the joint member and melting the weld overlay groove surface from the front side of the groove, A one-sided welding method that secures a throat thickness in the plate thickness direction that exceeds the plate thickness of the end face member or a throat thickness in the plate width direction that exceeds the plate width, or a throat thickness that exceeds both the throat thickness in both the plate thickness and the plate width direction. 4. The method according to claim 1 or 3, wherein, when overlay welding is performed between the back surface of the end surface portion of the welded joint member and the backing material, the backing material that is not melted by the welding heat source is meat. After applying overlay welding metal or a thin steel sheet of a similar material to the weld joint member in close contact with the overlay welding side and performing overlay welding while melting the thin steel sheet, the weld joint end surface including the overlay weld metal Performing groove processing of the member, then, by welding the welded joint members to each other while facing the joint member and melting the build-up weld metal groove face from the front side of the groove, of the member of the weld joint end face part One-sided welding method that secures a throat thickness in the plate thickness direction that exceeds the plate thickness or a throat thickness in the plate width direction that exceeds the plate width, or a throat thickness that exceeds both the throat thickness in both the plate thickness and the plate width direction. 5. In a steel structure, a backing material that is not melted by a welding heat source is applied to the end face of a grooved T-type welded joint member or one or both end faces of a butt joint member, and the back face of the end face portion of the welded joint member is applied. Alternatively, overlay welding is performed between the back surface including the side surface and the backing material, and a part of the backing material abutting surface of the overlay welding metal is used as an extension of the main body joint groove, and thereafter, the joint member. From the front side of the groove by welding the welded joint members to each other while melting the groove surface of the weld overlay weld metal, and the throat thickness or the plate width in the plate thickness direction exceeding the plate thickness of the member of the weld joint end face portion. One-sided welding method that secures a throat thickness that exceeds the throat thickness in the plate width direction or both throat thicknesses in the plate width and plate width directions.