JP5817958B2 - Deformation suppression member for welded joint and deformation suppression method using this deformation suppression member - Google Patents

Description

  The present invention relates to a deformation suppressing member for a welded joint to be attached to prevent deformation due to welding heat generated in a butt welded joint with a backing metal of a steel plate, and a deformation suppressing method using the deformation suppressing member.

Butt welded joints with backing metal may be used for thin steel plates such as the bottom plate of stainless steel flat bottom cylindrical storage tanks. When applying the TIG welding method to this welded joint, it is known that a plurality of layers are stacked and welded to cause angular deformation due to welding heat.
Conventionally, a case where a steel plate having a thin plate thickness is generally butt welded with a backing metal will be schematically described with reference to FIG.
FIG. 7 (A) shows a case where the groove portion 3 of the butt weld joint with the backing metal 2 of the steel plates 1a, 1b placed on a flat surface is welded from the upper side like a welded portion 4. FIG.
FIG. 7 (B) shows a state in which the center is sunk by the welding heat of the welded portion 4 and is angularly deformed by thermal strain so that both sides are curved and floated.
Therefore, as shown in FIG. 7C, a measure can be considered in which the steel plates 1a and 1b are deformed so that the center is pushed upward and the both sides are pushed down as shown by symmetrical arrows.

  In order to prevent the angular deformation as described above, FIG. 8 shows a plurality of plate-like attachment members 5 on the upper surfaces of the steel plates 1a and 1b so as to straddle the groove portions 3 on the butted backing metal 2. This is a general case where the welds 6 and 6 are fixed.

  As a conventional welding technique, there is Japanese Patent Application Laid-Open No. 56-4577 “Distortion Prevention Welding Method for Steel Plate Tank”. In the present invention, when assembling the bottom plate of a steel tank, etc., the welding procedure is devised to suppress the occurrence of welding distortion. As the prior art, the distortion prevention treatment provided perpendicular to the lap weld joint is shown in FIG. Ingredients are introduced.

  Japanese Patent Laid-Open No. 11-156590 “Backing for welding” of Patent Document 2 is also available. In this invention, when a side plate material is butt-welded and double-sided welded, as a welding backing provided in the groove portion, an abutting material having a substantially circular cross section in contact with the root edge of the groove portion and this abutting material are provided. A member formed from a pressing material pressed against the groove portion is disclosed, and a portal-shaped member is attached by welding in the vicinity of the groove portion.

Furthermore, in Japanese Patent Application Laid-Open No. 2007-118044 “butt welding method” of Patent Document 3, the groove portions 2 of the flat plates 1 are abutted and arranged on the upper part of the copper backing 5 on the surface plate 3, and the groove portions thereof are arranged. In this method, the liner 6 is disposed at a predetermined position on the surface plate 3, the bag body 4 is provided at the lower part of the copper backing 5, and the liner 6 and the upper part of the copper backing 5 are provided. The flat plate 1 is placed on the weight 9 and the weight 9 is placed thereon, and the copper backing 5 is pushed up to the back surface of the groove portion 2 by press-fitting the gas into the bag body 4 and expanding it. It is disclosed that welding is performed in close contact.

JP-A-56-4577 JP 11-156590 A JP 2007-118044 A

As shown in FIG. 7C, which is generally considered in the past, the measures to keep the steel plate 1a, 1b on both sides pushed up in the vicinity of the groove portion 3 so as to be pushed down symmetrically are very to manufacture processed to bend the edge vicinity, it is difficult to carry keeping the further plate thickness is thin steel plates 1 of the curved shape installation.

  Further, the welding and fixing of the flat mounting member 5 across the groove portion 3 for preventing distortion shown in FIG. 8 is troublesome because the number of welding portions 6 of the mounting member 5 is increased, and the surface treatment and inspection of the removal trace are complicated. Was necessary.

  The distortion prevention jig | tool currently disclosed by patent document 1 is a distortion prevention jig | tool provided in the lap-weld joint part at right angles and spaced apart, Comprising: The distortion produced in the joint part vicinity which welds a steel plate with thin plate | board thickness It is not a jig suitable for preventing deformation.

  The attachment member to the groove part disclosed in Patent Document 2 is an attachment member used for a copper backing, a gate-shaped member, a holding member, etc., matched to the groove part provided on the front and back sides of the side plate. It cannot be applied to a joint part where a steel plate such as a bottom plate is abutted and welded from the upper surface.

  Patent Document 3 is a butt welding method that uses a jig with a simple structure to maintain the adhesion of the copper backing, has a smooth back surface shape, and does not cause defects such as protrusion and cracking. Since it is necessary to provide many members such as the liner 6, the copper backing 5, and the bag body 4, it is difficult to install and use it at the lower part of the steel plate joint portion having a large area such as the bottom plate of the storage tank.

The present invention has been made in view of the above-described problems of the prior art, and its object is to weld heat when butt welding a thin steel plate such as a bottom plate of a storage tank on a backing metal. It is an object of the present invention to provide a deformation suppressing member for a welded joint having a structure that can be easily manufactured and attached and removed, and a deformation suppressing method using the deformation suppressing member.

The deformation suppressing member for a welded joint according to claim 1 is for preventing deformation of the steel plates 1a and 1b generated by welding heat when the steel plates 1a and 1b having thin thicknesses are butt-welded on the backing metal 2 for welding. The deformation suppression member of the welded joint that is attached in the vicinity of the groove portion 3 has a lower end surface that is bent in an L shape at both legs so as to straddle the groove portion 3 of the steel plates 1a and 1b. A gate-shaped member 4 provided so as to abut in the vicinity of the groove portion 3 in the orthogonal direction, and a lower end edge of the gate-shaped member 4 is fixed to the steel plate 1b through the welded portion 6 through the upper surface opening 4a of the portal-shaped member 4 in the vertical direction. a pulling plate 5 which is characterized in that it is formed by a taper pin 7 which is inserted into the opening window 5a of the substantially central portion of the pulling plate 5.

The deformation suppression member for a welded joint according to claim 2 is for preventing deformation of the steel plates 1a, 1b generated by welding heat when the thin steel plates 1a, 1b are butted on the backing metal 2 and welded. The deformation suppressing member of the welded joint attached in the vicinity of the groove portion 3 has the lower end surface of the steel plates 1a, 1b bent at the L-shape of both legs so as to straddle the groove portions 3 on the upper surfaces of the steel plates 1a, 1b. A gate-shaped member 4 provided so as to be in contact with a position in the orthogonal direction from the groove portion 3 on each upper surface, and a pull-up in which the lower end edge is fixed to the backing metal 2 in the welded portion 8 through the portal-shaped member 4 It is characterized in that it is formed by a plate 5 and a taper pin 7 inserted through substantially the center of the pull-up plate 5.

The deformation suppression member for a welded joint according to claim 3 is for preventing deformation of the steel plates 1a and 1b generated by welding heat when the thin steel plates 1a and 1b are butted on the backing metal 2 for welding. The deformation suppression member of the welded joint that is attached in the vicinity of the groove portion 3 has a lower end surface that is bent in an L shape at both legs so as to straddle the groove portion 3 of the steel plates 1a and 1b. A gate-shaped member 4 provided so as to come into contact with a position in the orthogonal direction from the groove portion 3, and a lower end edge of the screw hole 2 a provided in the backing metal 2 in the welded portion 8 through the portal-shaped member 4. It is formed by a fixing screw portion 9 a provided so as to be screwed, an adjustment screw portion 9 b formed at a position protruding upward from the insertion port of the portal member 4, and a lifting bolt 9 having an adjustment nut 10. And

According to a fourth aspect of the present invention, there is provided the deformation suppressing method according to any one of the first to third aspects, wherein the deformation suppressing member of the welded joint of claims 1 to 3 is installed in the vicinity of the groove portion 3 of the butt welding with the backing metal 2 of the steel plates 1a, 1b. A method for preventing deformation, which includes a step of fixing the lifting plate 5 or the lifting bolt 9 to the steel plates 1a, 1b or the backing metal 2, and a gate member 4 inserted through the lifting plate 5 or the lifting bolt 9 A step of installing the shape member 4, a step of inserting the taper pin 7 or the adjustment nut 10 into the pull-up plate 5 or the pull-up bolt 9, and a step of pulling up the vicinity of the groove portion 3 by driving the taper pin 7 or adjusting the adjustment nut 10. The deformation in the opposite direction corresponding to the welding angle deformation in the case where no deformation prevention measures are taken is applied in advance to reduce the finished welding deformation.

The deformation suppressing member for a welded joint according to claim 1 is for preventing deformation of the steel plates 1a and 1b generated by welding heat when the steel plates 1a and 1b having thin thicknesses are butt-welded on the backing metal 2 for welding. The deformation suppression member of the welded joint that is attached in the vicinity of the groove portion 3 has a lower end surface that is bent in an L shape at both legs so as to straddle the groove portion 3 of the steel plates 1a and 1b. A gate-shaped member 4 provided so as to abut in the vicinity of the groove portion 3 in the orthogonal direction, and a lower end edge of the gate-shaped member 4 is fixed to the steel plate 1b through the welded portion 6 through the upper surface opening 4a of the portal-shaped member 4 in the vertical direction. a pulling plate 5 that, because formed by a taper pin 7 which is inserted into the opening window 5a of the substantially central portion of the pulling plate 5, the gate-shaped member 4 and the pulling plate 5, simple shapes steel and steel plate or band plate such manufacture easily a member of the structure, the legs of the portal member 4 Shape in the bent lower end surface of the steel sheet 1a, since in contact with the upper surface 1b, the fixed raising plate 5 of a thin strip plate material mounting welds 6, less part of the mounting welding compared to the conventional, the installation and removal Easy to work with. By installing the portal member 4 and driving the taper pin 7, pre-strain, that is, application of reverse strain, can be easily and easily adjusted. Further, it is possible to remove the attachment weld 6 and reduce repair welding and inspection.

The deformation suppression member for a welded joint according to claim 2 is for preventing deformation of the steel plates 1a, 1b generated by welding heat when the thin steel plates 1a, 1b are butted on the backing metal 2 and welded. The deformation suppressing member of the welded joint attached in the vicinity of the groove portion 3 has the lower end surface of the steel plates 1a, 1b bent at the L-shape of both legs so as to straddle the groove portions 3 on the upper surfaces of the steel plates 1a, 1b. A gate-shaped member 4 provided so as to be in contact with a position in the orthogonal direction from the groove portion 3 on each upper surface, and a pull-up in which the lower end edge is fixed to the backing metal 2 in the welded portion 8 through the portal-shaped member 4 Since it is formed by the plate 5 and the taper pin 7 inserted through the substantially central portion of the lifting plate 5, it becomes possible to apply an additional force necessary for the deformation directly to the necessary portion and in the vicinity of the groove portion 3. Can be raised to the average. Further, since there is no welding to the steel plate 1, the repair inspection of the jig trace is not required.

The deformation suppression member for a welded joint according to claim 3 is for preventing deformation of the steel plates 1a and 1b generated by welding heat when the thin steel plates 1a and 1b are butted on the backing metal 2 for welding. The deformation suppression member of the welded joint that is attached in the vicinity of the groove portion 3 has a lower end surface that is bent in an L shape at both legs so as to straddle the groove portion 3 of the steel plates 1a and 1b. A gate-shaped member 4 provided so as to come into contact with a position in the orthogonal direction from the groove portion 3, and a lower end edge of the screw hole 2 a provided in the backing metal 2 in the welded portion 8 through the portal-shaped member 4. Since it is formed by a fixing screw portion 9a provided to be screwed, an adjustment screw portion 9b formed at a position protruding upward from the insertion port of the portal member 4, and a lifting bolt 9 having an adjusting nut 10, The bolt 9 can be easily attached and removed, Because strange adjustment can be made simple and easy, without adding excessive force, it can be expected reduction of residual stress. Further, since there is no welding not only to the steel plate 1 but also to the backing metal 2, the repair inspection of the jig removal trace becomes unnecessary.

According to a fourth aspect of the present invention, there is provided the deformation suppressing method according to any one of the first to third aspects, wherein the deformation suppressing member of the welded joint of claims 1 to 3 is installed in the vicinity of the groove portion 3 of the butt welding with the backing metal 2 of the steel plates 1a, 1b. A method for preventing deformation, which includes a step of fixing the lifting plate 5 or the lifting bolt 9 to the steel plates 1a, 1b or the backing metal 2, and a gate member 4 inserted through the lifting plate 5 or the lifting bolt 9 A step of installing the shape member 4, a step of inserting the taper pin 7 or the adjustment nut 10 into the pull-up plate 5 or the pull-up bolt 9, and a step of pulling up the vicinity of the groove portion 3 by driving the taper pin 7 or adjusting the adjustment nut 10. The deformation in the opposite direction corresponding to the welding angle deformation in the case where no deformation prevention measures are taken is preliminarily applied, so that the finished welding deformation is reduced, so that the vicinity of the groove portion 3 is improved. Pulled securely predetermined amount of deformation, it is possible to provide a predistortion words.
The structure adjusted by driving the taper pin 7 can be pulled up by a required height by the driving amount.
Further, when adopting a structure in which the lower end of the lifting plate 5 is fixed to the backing metal 2, the vicinity of the groove portion 3 can be pulled up on average, and since the steel plate 1 has no welded portion, its removal jig trace No repair inspection is required.
Furthermore, the structure in which the lower end of the lifting bolt 9 is screwed into the screw hole 2a provided in the backing metal 2 is easy to attach and remove the lifting bolt 9, and the lifting height can be easily adjusted by rotating and tightening the adjusting nut 10. Further, it is possible to easily adjust the pulling height while observing the state in accordance with the amount of deformation caused by thermal distortion that occurs each time when a plurality of layers are welded. Further, since the steel plate 1 and the backing metal 2 do not have a welded portion, the repair inspection becomes unnecessary.

It is an isometric view explanatory drawing which shows the deformation | transformation suppression member of the welded joint which concerns on this invention. A situation in which a plurality of deformation suppressing members shown in FIG. 1 are arranged is shown. It is side sectional explanatory drawing which shows a 1st example of an embodiment. It is a side section explanatory view showing the example of the 2nd embodiment. It is a side section explanatory view showing the example of the 3rd embodiment. It is side sectional explanatory drawing which shows the example of 4th Embodiment. (A), (B), (C) is side sectional explanatory drawing which shows the groove part of the conventional general horizontal joint. It is perspective explanatory drawing which shows the deformation | transformation suppression member of the conventional general welded joint.

Embodiment examples of the deformation suppressing member for a welded joint according to the present invention will be described with reference to FIGS. 1 to 6. In the drawings, the same, corresponding, or generic items are denoted by the same reference numerals.
A thin steel plate 1 having a thickness of, for example, about 6, 9, 12 to 16 mm, such as a bottom plate of a stainless steel flat bottom cylindrical storage tank, employs a welded joint that abuts on a backing metal 2 placed on a flat surface. When the TIG welding method is applied to the groove portion 3 of this welded joint, a gate shape is formed so as to straddle the groove portion 3 in order to prevent angular deformation due to thermal distortion of welding heat when a plurality of layers are welded. A deformation suppressing member such as the member 4 is provided.
The present invention is not limited to the following embodiments. It goes without saying that the embodiments can be modified without departing from the gist of the present invention.

FIG. 1 shows a deformation suppressing member to be attached in order to prevent angular deformation that is likely to occur when a thin steel plate is butt welded. FIG. 2 shows a situation in which a plurality of deformation suppressing members shown in FIG. 1 are continuously arranged.
The deformation suppression member of this welded joint includes a portal member 4 provided so as to straddle the groove portion 3 of the steel plates 1a and 1b, and a pulling plate 5 inserted through the portal member 4 and fixed to the steel plate 1 by the welded portion 6. , And a taper pin 7 of a wedge-like member inserted through the substantially central portion of the pulling plate 5.
For each of these members, a stainless steel material of the same material is used at least at the part that contacts the steel plate 1, the part that is fixed by welding, or the whole.

The gate-shaped member 4 is manufactured using a shape steel material and a steel plate material such as a channel material and an angle material, and is formed into a simple temporary jig that is easy to manufacture and carry and install and remove.
In the horizontal portion of the gate-shaped member 4, an elongated opening 4a through which the lifting plate 5 is inserted in a loose fit is provided. Further, the lower end surfaces of both leg portions of the gate -shaped member 4 bent in an L shape come into contact with a position away from the groove portion 3 on the upper surface of the steel plates 1a and 1b by a predetermined distance, for example, about 10 to 30 centimeters. To form.

  The pulling plate 5 is a strip plate material having a thin plate thickness and is dimensioned to be freely fitted into the opening 4a of the gate-shaped member 4. A rectangular opening window 5a for driving the taper pin 7 is provided in the vicinity of the upper portion. . The size of the rectangular opening window 5a provided on the pulling plate 5 is not higher than the height at which the tip of the taper pin 7 enters 1 to 2 centimeters into the opening window 5a peeped upward when the portal member 4 is installed. A predetermined distance is opened, and the taper pin 7 is further driven so as to move upward and open.

The taper pin 7 is a wedge-shaped member having an inclination angle such that the driving depth is substantially the center position in a state where the groove portion 3 of the steel plates 1a and 1b is pulled up to a predetermined height position by horizontal driving. Is adopted.
The pulling force to the pulling plate 5 by the driving of the taper pin 7 is as if it is a lever with the contact portion of the portal member 4 with the both foot steel plates 1a and 1b as a fulcrum of the presser. The tip 3 can be lifted efficiently.

The deformation suppressing member is first erected by temporarily welding the lower end edge of the pull-up plate 5 at a position away from the welded portion 6 on the upper surface of the steel plate 1b by a predetermined distance, for example, about 1 to 5 centimeters. Next, the gate-shaped member 4 is installed from above through an elongated opening 4a provided in the horizontal portion thereof. Subsequently, the taper pin 7 is driven horizontally into the rectangular opening window 5a in a state in which the pulling plate 5 protruding from the gate-shaped member 4 is seen.
Depending on the driving amount of the taper pin 7, the required portion and the predetermined range can be pulled up by the required height, and when the plural layers are welded, the lifting height corresponding to the amount of deformation caused by thermal strain is observed. Can be adjusted.

  As shown in FIG. 2, a plurality of gate-shaped members 4 are installed continuously at the same pitch among 30, 50, 60 to 100 centimeters, for example, in relation to the plate thickness, and the lifting plates 5 are the same. It welds and fixes along the steel plate 1b. Although not shown, if the pulling plates 5 are alternately provided on the steel plates 1a and 1b, the pulling force in the vicinity of the welded portion 3 can be averaged and the workability of welding can be improved.

  FIG. 3 is an explanatory side sectional view showing a first embodiment similar to FIG. The steel plates 1a and 1b are pulled up and adjusted by driving the taper pin 7 into the opening window 5a of the pulling plate 5. This pulling height is the height at which the steel plates 1a, 1b return to the horizontal after cooling so as to give deformation in the opposite direction corresponding to the deformation amount of the steel plates 1a, 1b due to the influence of welding heat, that is, reverse strain, for example 1-5 About centimeters.

The gate-shaped member 4 and the lifting plate 5 are members having a simple structure, easy to manufacture, easy to attach and remove, and easy and reliable to apply reverse strain.
In addition, the installation of the portal member 4 and the insertion and removal of the taper pin 7 can be easily performed with good workability. After cooling and removing the jig after welding, the horizontal position can be restored. Welding and inspection can be reduced.

FIG. 4 is an explanatory side sectional view showing a second embodiment.
The pull-up plate 5 is fixed on the symmetrical steel plates 1a and 1b with the welded portions 6 and 6 sandwiched between the groove portions 3. Since the pulling loads are averaged by the pulling plates 5 and 5, the vicinity of the groove portion 3 can be raised to the average. In this case, the steel plate 1 a is temporarily welded to the backing metal 2 in the groove portion 3.

FIG. 5 is an explanatory side sectional view showing a third embodiment.
When it is not desirable to weld directly to the steel plate 1 such as a nuclear storage tank, the structure is such that the lifting plate 5 is welded to the backing metal 2 in the welded portion 8 without being welded to the steel plate 1.
The deformation suppressing member includes a gate-shaped member 4 provided so as to straddle the groove portion 3 of the steel plates 1a, 1b, a pulling plate 5 inserted through the portal-shaped member 4 and fixed to the backing metal 2 by a welded portion 8, It forms with the taper pin 7 penetrated in the substantially center part of the raising board 5. FIG.
The route interval of the welded portion 8 is about 4 to 10 millimeters, and the thickness of the lifting plate 5 fixed to the backing metal 2 is set to a size that falls within this route interval.
The structure in which the lower end of the lifting plate 5 is fixed to the backing metal 2 can raise the vicinity of the groove portion 3 on average. Moreover, since there is no welding to the steel plate 1, the inspection and repair of the jig removal trace become unnecessary.
When welding the welded portion 8, welding is not performed for about 2 to 3 centimeters on both sides of the portion where the lifting plate 5 is fixed to the backing metal 2, and all other portions are welded to 50 degrees. After cooling to C or lower, the deformation suppressing member including the pulling plate 5 is removed, and the remaining groove portion 8 is welded.

FIG. 6 is an explanatory side sectional view showing a fourth embodiment.
Further, in the case where it is severely disliked to be welded and fixed to the backing metal 2 in the welded portion 8, a structure is adopted in which a lifting bolt 9 is screwed and fixed to the backing metal 2.
The deformation suppressing member is formed in a portal member 4 provided so as to straddle the groove portion 3 of the steel plates 1a and 1b, and in the screw hole 2a provided in the backing metal 2 in the welded portion 8 through the portal member 4. A fixing screw portion 9a provided so as to screw the lower end edge, and a lifting bolt 9 having an adjusting screw portion 9b and an adjusting nut 10 at a position protruding upward from the portal member 4 insertion port are formed.
The pull-up bolt 9 is tightened and fixed from above, and then the adjustment nut 10 is tightened to adjust the pull-up height. The root interval of the welded portion 8 is about 4 to 10 millimeters, and the diameter of the screw hole 2a provided in the backing metal 2 and the outer shape of the bolt 9 are the dimensions within the above-described root interval.
The structure in which the fixing screw portion 9a at the lower end of the lifting bolt 9 is screwed into the screw hole 2a provided in the backing metal 2 is easy to attach and remove the lifting bolt 9, and the adjustment of the lifting height is performed by the adjusting screw portion. This can be done easily and easily by rotating and tightening the adjusting nut 10 of 9b . Furthermore, it is possible to easily adjust the lifting height corresponding to the amount of deformation caused by thermal strain that occurs each time a plurality of layers are welded, while observing the situation. Further, since not only the steel plate 1 but also the backing metal 2 has no welded portion, it is not necessary to inspect and repair the jig removal trace.
When welding the welded portion 8, about 2 to 3 centimeters on both sides of the fixed portion of the lifting bolt 9 to the backing metal 2 is not welded, but the other portions are welded. After this welding is completed and cooled to 50 degrees C or less, the deformation suppressing member including the lifting bolt 9 is removed. At this time, the lifting bolt 9 may be cut by filling the surface of the backing metal 2 or may be filled by plug welding after being removed from the fixing screw portion 9a. Thereafter, the remaining groove portion 8 is welded to complete all the welding.

The deformation suppression member for a welded joint of the present invention is shown for a case where a thin steel plate such as a bottom plate of a storage tank is butt welded on a backing metal, but in addition to that, the welding heat of a welded joint such as a roof plate or a side plate is shown. In the case of preventing distortion deformation due to, it can be applied to horizontal welded joints and vertical welded joints of various welded structures as needed. In particular, when used for welding a stainless steel material that tends to have a large amount of welding deformation, the conspicuousness of the efficiency is remarkably excellent.

1,1a, 1b Steel plate
2 Back money
2a Screw hole
3 groove part
4 Portal members
4a opening
5 Lifting plate
5a Open window
6 Welded part
7 Taper pin
8 Welded part
9 Lifting bolt
9a fixing screw
9b adjustment screw
10 Adjustment nut

Claims (4)

Deformation suppressing member for welded joint attached in the vicinity of groove portion 3 in order to prevent deformation of steel plates 1a, 1b generated by welding heat when welding thin steel plates 1a, 1b on backing metal 2 the steel sheet 1a, so that straddle the 1b groove portion 3 of the abutment at a position near the perpendicular direction bottom surface bent in an L-shape of the legs steel 1a, the groove portion 3 of the upper surface of the 1b a portal member 4 provided to a pulling plate 5 which is fixed to the lower edge of the upper opening 4a of the gate-shaped member 4 to the steel sheet 1b in the weld 6 is inserted in the vertical direction, approximately in the middle of the pulling plate 5 A deformation suppression member for a welded joint, which is formed with a taper pin 7 that is inserted into the opening window 5a.
Deformation suppressing member for welded joint attached in the vicinity of groove portion 3 in order to prevent deformation of steel plates 1a, 1b generated by welding heat when welding thin steel plates 1a, 1b on backing metal 2 Is a position in the perpendicular direction from the groove portion 3 of each upper surface of the steel plates 1a, 1b with the lower end surface bent in an L shape of both leg portions so as to straddle the groove portions 3 on the upper surfaces of the steel plates 1a, 1b. A portal member 4 provided so as to be in contact with the lifting plate 5, a lifting plate 5 inserted through the portal member 4 and having a lower end edge fixed to the backing metal 2 in the welded portion 8, and a substantially central portion of the lifting plate 5 A deformation suppression member for a welded joint, which is formed with a taper pin 7 to be inserted.
Deformation suppressing member for welded joint attached in the vicinity of groove portion 3 in order to prevent deformation of steel plates 1a, 1b generated by welding heat when welding thin steel plates 1a, 1b on backing metal 2 The lower end surface of the leg portions bent in an L shape so as to straddle the groove portion 3 of the steel plates 1a and 1b is brought into contact with the position in the orthogonal direction from the groove portion 3 of each upper surface of the steel plates 1a and 1b. A gate-shaped member 4 provided so as to be fixed, and a fixing screw portion 9a provided so that a lower end edge is screwed into a screw hole 2a which is inserted into the portal-shaped member 4 and provided in the backing metal 2 in the welded portion 8. A weld joint deformation suppressing member, characterized in that it is formed by an adjustment screw portion 9b formed at a position protruding upward from the insertion port of the portal member 4 and a lifting bolt 9 having an adjustment nut 10.
The deformation suppressing method for preventing the angular deformation due to welding by installing the deformation suppressing member of the welded joint according to claims 1 to 3 in the vicinity of the groove portion 3 of the butt welding with the backing metal 2 of the steel plates 1a and 1b includes the lifting plate 5 Alternatively, the step of fixing the lifting bolt 9 to the steel plates 1a, 1b or the backing metal 2, the step of inserting the gate-shaped member 4 through the lifting plate 5 or the lifting bolt 9 and installing the gate-shaped member 4, and the lifting plate 5 Alternatively, when the taper pin 7 or the adjusting nut 10 is inserted into the pulling bolt 9 and the step of pulling up the vicinity of the groove portion 3 by driving the taper pin 7 or adjusting the adjusting nut 10 is performed and no deformation prevention measures are taken. The deformation | transformation suppression method using the deformation | transformation suppression member characterized by making the welding deformation of a finish small by giving beforehand the deformation | transformation of the opposite direction corresponded to welding angle deformation | transformation in.

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