JP2000158127A - Weld jointing method of steel material superior in arrest property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weld joining method of a steel material superior in arrest property by which a weld joining part is obtainable in a way that an outlooktng, fixing is good and brittleness rupture can be prevented at low cost. SOLUTION: When a steel material superior in arrest property is welded, the spreading of brittleness cracking is stopped by means of an arrest property base metal by setting a welding line with an angle of 20 degrees or more against a line orthogonal to a material axis, or crocked at more than two points. In this case, the method is applied when, for example, a Ni inclusive steel, whose toughness value Kc at the lowest using temperature is 300 kgf/mm1.5 or more, or a steel whose surface layer is ultra fine grain and the like is used as a steel material superior in arrest property.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing brittle fracture at a welded portion when, for example, building an architectural structural member by welding and joining Ni-containing steel, super-fine grained steel, etc. having excellent arrestability. To a welding method.

[0002]

2. Description of the Related Art Conventionally, in a building structural member and a building structure using this building structural member, welding is often used as a joining means, but a brittle crack may occur in a welded portion as compared with a base material. When high resistance is generated, the proof stress may be suddenly reduced without sufficient plastic deformation. There is a possibility that a building structural member and a building structure constructed by welding that easily causes the generation and propagation of such brittle cracks will collapse without sufficiently exhibiting the plastic deformation capacity expected in the design.

[0003] The building structural members constituting the building structure are required to have independent functions, and if a brittle fracture occurs, there is a possibility that the building structure is immediately linked to collapse. Therefore, if a brittle crack occurs,
It is desirable to stop the propagation of this crack within a range of several tens of mm within the range of plastic deformation expected in the design. In order to meet this demand, it is conceivable to use a steel material having a performance of stopping the propagation of brittle cracks (in the present invention, simply referred to as “arrestability”) as a building structural member and a welding material.

Conventionally, for example, in the field of building structures,
There is no concept of using steel material with excellent arrestability,
As a steel material having excellent arrestability, for example, Patent No. 259
As described in Japanese Patent No. 3556, there is a steel material having an ultrafine grain structure in the surface layer, a Ni-containing steel (a steel material containing 0.1% or more of Ni), and the like. In the present invention, an ultrafine grain structure having an average grain size of 5 μm or less is formed on at least one surface of a steel material having an ultrafine grain structure of at least 5% or 3 mm or more from the surface. Steel
Hereinafter, it is referred to as “surface layer ultrafine grained steel”.

[0005] These steel materials having excellent arrestability sufficiently exhibit their properties when bolted joints are used, but particularly in the case of super-fine grained steel, when welding is used as the joining means. , The arrestability is reduced in the welded area, especially when performing a conventional general welding joint that forms a welding line in a direction perpendicular to the material axis, if a crack occurs in the welded area, this crack It is feared that it will propagate along the line and eventually lead to brittle fracture.

As a method for solving such a concern, (1) in the case of a Ni-containing steel, a brittle crack is surely generated in a base material excellent in arrestability by enlarging a weld and reducing stress. In addition, a method of avoiding the occurrence of cracks in a welded portion, or a material having excellent arrestability (for example, a welding material containing at least 0.1% or more of Ni (hereinafter, referred to as a “Ni-containing welding material”)) is used. Therefore, even if a crack occurs in the weld, a method of stopping the propagation can be considered, etc. (2) In the case of the surface layer ultrafine grained steel, the weld is widened to reduce the stress and the brittle crack is surely formed. A method is conceivable in which a crack is generated in a welded portion by causing the crack to occur in a base material having excellent arrestability.

Although it is conceivable to use a Ni-containing welding material as a welding material, there is a possibility that the Ni-containing welding material is broken at a coarse-grained HAZ portion or a bond portion. However, when widening the weld,
Since the number of processing steps increases and the amount of steel material increases, the cost increases, and the appearance and fit are poor. In addition, when Ni-containing steel is used, the base material itself is quite expensive, and when Ni-containing welding material is used as the welding material, there is a problem that it becomes very expensive.

[0008]

SUMMARY OF THE INVENTION According to the present invention, when welding a steel material having excellent arrestability, the above problems can be advantageously solved and brittle fracture at a welded portion can be prevented at low cost. It is intended to provide a method for welding and joining steel materials which is excellent in quality.

[0009]

Means for Solving the Problems The first invention of the present invention is:
This is a method for welding steel materials having excellent arrestability, characterized in that when welding steel materials having excellent arrestability, the welding line is inclined with respect to a line perpendicular to the material axis. According to a second aspect, in the first aspect, when welding a steel material having excellent arrestability, a welding line is formed by a distance of 2 ° with respect to a line orthogonal to the material axis.
This is a method for welding and joining steel materials having excellent arrestability, characterized by being inclined at 0 to 40 degrees. A third invention is a method for welding and joining steel materials having excellent arrestability, wherein a welding line is bent at one or more places when welding steel materials having excellent arrestability. The fourth invention is a method for welding and joining steel materials excellent in arrestability, wherein a part or all of a welding line is formed into a curve in the first to third inventions.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Brittle cracks propagate in a direction substantially perpendicular to the principal stress direction. Therefore, in the present invention, by devising the shape of a welding line, brittle cracks generated in a welded portion are excellent in arrestability. And stops at a very short distance (for example, within several tens of mm) to prevent brittle fracture. The steel material excellent in arrestability according to the present invention is defined as having a toughness value Kca of 300 kgf / m at a minimum use temperature.
m ^1.5 or more.

[0011] The present invention provides various shapes of steel materials, thick steel plates, and various steel shapes (H) made of steel materials having excellent arrestability at this level.
Welding and joining of these steel materials using inexpensive welding materials for general structural steel materials, such as steel shapes, I-shaped steels, T-shaped steels, L-shaped steels, channel steels, etc.), square steel pipes, circular steel pipes, etc. Applicable in cases. The basic configuration of the present invention will be described by taking, as an example, a case of welding and joining a thick steel plate having excellent arrestability.

FIG. 1 (a) shows an example of a conventional general welding method in which thick steel plates 1a and 1b having excellent arrestability are welded in a direction perpendicular to the axial direction of the material. When a load acts in the direction of the arrow, a brittle crack zc may occur in the welded portion as in the case of the general structural steel, and as shown in FIG. Propagation along the line, brittle fracture zz with almost no plastic deformation
May occur. According to the present invention, when the brittle crack zc is generated in the weld as described above, the crack zc is caused to penetrate into the base material having excellent arrestability, and the propagation of the brittle crack is extremely short (for example, within several tens mm). ) To form a weld w joint so as not to cause brittle fracture.

More specifically, the following methods (1) and (2) are employed. (1) For example, when welding thick steel plates 1a and 1b having excellent arrestability, as shown in FIG. 2, the welding line is inclined at an angle (θ) with respect to a line cL orthogonal to the material axis zL. Let
The brittle crack zc generated in the welded portion is pierced into the base material excellent in arrestability and stopped, and the propagation distance a of the brittle crack zc is stopped, for example, within several tens of mm to prevent brittle fracture zz. is there.

FIG. 3 shows the relationship between the inclination angle θ of the weld line and the crack propagation distance a. This is because the toughness value Kca at the minimum operating temperature is 300 kgf / mm ^1.5. as specimen 4 the steel plates (thickness 50 mm) made of, what Kca will impart yield stress of more stress in the temperature range to be 1000 kgf / mm ^1.5 or more, it was created on the basis of the result of the duplex ESSO test It is. Here, the inclination angle θ of the welding line of the specimen 4 is changed, and the inclination angle θ
Separately, the crack propagation distance a in the specimen 4 was measured, and the inclination angle θ
And the relationship between the crack propagation distance a.

In this hybrid ESSO test, as shown in FIG. 4, the grooves 2 were formed in a direction orthogonal to the stress P direction at a yield stress or higher.
A specimen 4 having a welding line with a different inclination angle θ formed on the side end of the guide groove 3 formed with the welding groove is welded so that the welding w end coincides with the groove end to obtain a stress P equal to or higher than the yield stress level.
In the groove 2 on the non-weld side of the guide groove 3
The notch 5 formed at the end is hit with a wedge-shaped tool 6 to generate a crack c and propagate to the weld ww end of the specimen 4. In FIG. 3 above, the crack propagation distance a
For example, in order to stop the rotation within several tens of mm, the inclination angle θ may be set to 20 degrees or more.

On the other hand, if the inclination angle θ is too large, the welding WW joining distance will be greatly increased, and the time for groove processing and welding joining will be long, and the joining cost will increase. The value may be set in consideration of the object to be welded, the crack propagation distance a allowed in the scale, and the like. For example, when targeting building structures,
It is considered that if the crack propagation distance a can be stopped within several tens of millimeters, brittle fracture can be prevented without the expected range of plastic deformation in most cases. The shape of the welding line may be bent to both sides around the material axis zL as shown in FIG. In this case, it is not an absolute condition that the angles on both sides are the same. It is preferable to set the angle in consideration of the steel material condition and the load application condition.

(2) For example, when welding thick steel plates 1a and 1b made of a surface layer ultrafine-grained steel having excellent arrestability, as shown in FIG. 6, a welding line parallel to the material axis zL is formed as shown in FIG. And welding lines orthogonal to the material axis zL, and the bent portions 7a, 7
b, brittle cracks zc are surely pierced into the base material having excellent arrestability, and propagation of the brittle cracks zc rushed into the base material is stopped at a short distance by using the arrestability of the base material. This is to prevent break zz. In this case, the material axis zL
Is necessary to ensure that the brittle crack zc penetrates into the base material without any decrease in arrestability, and is preferably equal to or greater than the thickness of the thick steel plate 1a (1b).

If the length L of the welding line parallel to the material axis zL is less than the thickness of the thick steel plate 1a (1b), the brittle crack z
In some cases, c cannot sufficiently penetrate into a base material having no reduction in arrestability, and the stopping distance of crack propagation cannot be sufficiently reduced. On the other hand, if the length L of the welding line parallel to the material axis zL is too long, the welding distance is greatly increased, and the time for groove processing and welding is lengthened, which increases the joining cost. The upper limit is set in consideration of these factors.

As shown in FIG. 7, the shape of the welding line is formed by a welding line parallel to the material axis zL and a welding line orthogonal to the material axis zL, and the bent portions 8a, 8b, 8c, 8d are formed. May be formed. In this case, it is not an absolute condition that the welding line is formed symmetrically about the material axis. It is preferable to form in consideration of steel material conditions, load application conditions, and the like. In this case, the length L of the welding line parallel to the material axis is necessary to cause a brittle crack to enter the base material, and is preferably equal to or greater than the thickness of the plate material.

If the length L of the welding line parallel to the material axis is less than the thickness of the plate of the welding line parallel to the material axis, the crack propagation force cannot sufficiently penetrate the base material, In some cases, the stopping distance of crack propagation cannot be sufficiently shortened.
Also, if the length L of the welding line parallel to the material axis is too long,
Since the welding distance is greatly increased, the time for beveling and welding is lengthened, and the joining cost is increased.
The upper limit is set in consideration of these factors.

In the examples (1) and (2), the welding line is formed by a straight line or a combination of a straight line and a straight line. However, the welding line is formed by a curved welding line or a welding line combining a straight line and a curve. Is also good. Although the above example is an example in which thick steel plates are welded together, for example, in the case of a shaped steel, a square steel pipe, and a circular steel pipe, a crack generated in a weld portion is formed on a base material having excellent arrestability. The shape of the welding line may be designed so that it enters and stops.

In the case of shaped steel and square steel pipes, the welded joint is often formed on a plurality of continuous surfaces. In such a case, the welded joint of the present invention is applied to the welded joint on all surfaces. It is preferable to apply the joining method, but it is not essential, and in one or more ranges, depending on the interaction effect by joining on each surface, steel material condition, load acting condition,
What is necessary is just to apply the welding joining method of this invention. For example, when a steel material having a closed cross-section such as a square steel pipe or a semi-closed cross-section such as a channel steel is to be welded, a continuous surface is developed as one surface and described in (1) and (2) above. Such a welding line shape can be selected.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a building structural member will be described with reference to FIGS. 8 to 11
Is an example aimed at preventing a brittle rupture at a beam end welded portion which may occur when a tensile load is applied to a beam flange for a beam-column joint having a rigid frame structure.

FIGS. 8 (a) and 8 (b) show an example of a case where a rectangular steel tubular column 10 and an H-shaped steel beam 11 are welded w-joined by using a through diaphragm 9 to form a rigid frame structure. In this example, a weld w joint of the through-diaphragm 9 attached to the square steel tubular column 10 is formed at a corner 9k, and a weld w joint of the flange 11f of the H-shaped steel beam 11 to be weld w joined to this corner is: The inclined portion 111 of two sides symmetrical about the material axis
, 111 2, which are welded to the corners 9 k of the diaphragm 9 and welded to the corners 9 k of the diaphragm 9, and are combined with the web 1 of the H-shaped steel beam 11 on the square steel tubular column 10.
The 1u end is welded and joined.

In this example, the welding w joint has two inclined portions 1
Since the welding line is inclined at least 30 degrees from a line orthogonal to the axial direction of the material, the brittle crack generated at the welding portion between the diaphragm 2 and the flange 11f of the H-shaped steel beam 11 is formed. Propagation can be stopped by rushing into the respective base material without arrestability degradation.

FIGS. 9 (a) and 9 (b) show another example of the case where the square steel tubular column 10 and the H-shaped steel beam 11 are welded and joined by using the through diaphragm 9 to form a rigid frame structure. In this example, the weld w-joint of the diaphragm 9 attached to the square steel tubular column 10 is an inclined joint, and the weld w-joint of the flange 11f of the H-shaped steel beam 11 to be welded to the inclined joint is an inclined joint 111. The inclined joint is welded to the inclined joint 91 of the diaphragm 9 by welding w, and the end of the web 11u of the H-shaped steel beam 11 is welded to the square steel pipe column 10. In this example, the welding w-joint portion is formed of an inclined portion, and the welding line is inclined by 30 degrees or more with respect to a line perpendicular to the axial direction of the material, so that the through-diaphragm 9 and the H-beam 1
Propagation of a brittle crack generated in a welded portion with the first flange 11f can be stopped by the base material having no reduction in arrestability.

FIGS. 10 (a) and 10 (b) show the square steel tubular column 10
An example in the case where the end of the flange 11f of the H-shaped steel beam 11 is welded to the corner of the H-shaped steel beam 11 is shown. In this example, a corner 10k on the side of the rectangular steel tubular column 10 is used as a joint, and a weld w joint at the end of the flange 11f of the H-shaped steel beam 11 to be welded to the corner is
Two symmetrical inclined portions 111, 1, 1 about the material axis
As the concave right-angled joint consisting of 12, the concave right-angled joint at the end of the flange 11 f of the H-shaped steel beam 11 is
Welded to the side corners 10k, and combined with the square steel tube column 1
The end of the web 11u of the H-shaped steel beam 11 is welded to the top of the corner 10k of the "0" by welding w. In this example, the welding w-joint is composed of two inclined portions 111 and 112, and the welding line is inclined by 30 degrees or more with respect to a line perpendicular to the material axis direction. Propagation w of the brittle crack generated in the welded portion of the beam 11 with the flange 11f can be stopped by the base material having no reduction in arrestability.

FIGS. 11 (a) and 11 (b) show circular steel pipe columns 12 respectively.
An example in which the end of the flange 11f of the H-shaped steel beam 11 is welded to the side portion of the H-shaped steel beam 11 via a circular diaphragm 13 is shown. In this example, the circumferential surface of the circular diaphragm 13 attached to the side of the circular steel pipe column 12 is used as a weld w joint, and the weld w joint at the end of the flange 11 f of the H-shaped steel beam 11 welded to this circumferential surface is It is formed into a curved surface that matches the peripheral surface of the circular diaphragm 13, and this curved surface joint portion 11 c is welded to the peripheral surface of the circular diaphragm 13 by welding w.
The end of the web 11u of the H-shaped steel beam 11 is joined to the peripheral surface of the side portion 2 by a bolt 15 via a gusset plate 14. In this example, since the weld w-joint has a curved surface, the brittle crack generated in the weld between the circular diaphragm 13 and the flange 11f of the H-shaped steel beam 11 is removed by a base material having no reduction in arrestability. Can be stopped.

FIGS. 12 and 13 show the prevention of brittle rupture at a weld between members which may occur when a tensile load is applied to each part of a truss-structured chord, diagonal or bundle. This is an intended embodiment. FIGS. 12 (a) and 12 (b)
An example in which a rectangular steel pipe 16 serving as a chord material is welded to the top of the rectangular steel pipe 10 is shown. In this example, at the top of the rectangular steel pipe 10, an inclined joint 10p is formed by inclining at least 30 degrees with respect to a line perpendicular to the material axis, and the side of the square steel pipe 16 is matched with the inclined joint to fillet. They are joined by welding sw. In this example, since the welded joint is an inclined portion, the propagation of the brittle crack generated in the welded portion of the square steel pipe 10 with the square steel pipe 16 is stopped by the base material without the decrease in the arrestability. Can be.

FIGS. 13A and 13B show an example in which a rectangular steel pipe 18 serving as a chord material is welded to the top of a circular steel pipe 17 by welding sw. In this example, at the top of the circular steel pipe 17,
The inclined joint 17p is formed by inclining at least 30 degrees with respect to a line perpendicular to the material axis, and the peripheral surface of the rectangular steel pipe 16 is matched with the inclined joint and is joined by fillet welding sw. In this example, since the welded joint has an inclined portion, the propagation of the brittle crack generated in the welded portion of the circular steel pipe 17 and the square steel pipe 18 is stopped by the base material having no reduction in arrestability. Can be.

FIGS. 14 and 15 show a case in which a tensile load is applied to the whole or a part of the cross section of a long rectangular steel pipe column manufactured by welding and joining a rectangular steel pipe to a rectangular steel pipe. It is an example aiming at prevention of brittle rupture in welded joining between flexible square steel pipes.

FIGS. 14A and 14B show a square steel pipe 10a.
An example in the case of a long rectangular steel pipe column 10 formed by welding w and a square steel pipe 10b is shown. In this example, one square steel pipe 1
The joint of a is an inclined joint 10p inclined at 30 degrees to a line perpendicular to the material axis, and the joint of the other rectangular steel pipe 10b is an inclined joint inclined at 30 degrees to a line perpendicular to the material axis. As the portion 10q, the inclined joint 10p and the inclined joint 10
q is obtained by welding w. In this example, since the welded joint is an inclined joint, the propagation of the brittle crack generated in the welded part on each side of each of the rectangular steel pipes 10a and 10b is stopped by the base material without the arrest property decreasing. be able to. In this case, it is not essential that the joints on all surfaces of the rectangular steel pipes 10a and 10b be inclined joints. What is necessary is just to set the design conditions according to steel material conditions and load application conditions.

FIGS. 15A and 15B show a rectangular steel pipe 10a.
Another example in the case of a long rectangular steel tube column 10 formed by welding w and a square steel tube 10b is shown. In this example, a welded joint of one rectangular steel pipe 10a is formed with a step d between adjacent surfaces, and an inclined joint 10p inclined 20 degrees with respect to a line perpendicular to the material axis. The vertical joint portion 10s is formed, and the welded joint portion of the other square steel pipe 10b is formed on the inclined joint portion 10q, which forms a step d between adjacent surfaces and is inclined by 20 degrees with respect to a line perpendicular to the material axis, and the material axis. The parallel is a vertical joint 10s, in which the inclined joints of the opposing square steel pipe 10a and the other square steel pipe 10b are welded w-joined.

In this example, the welded joint is the inclined joint wt
And the vertical joint portion ws, the propagation of the brittle crack generated in the welded portion on each surface of each of the rectangular steel pipes 10a and 10b can be stopped by the base material having no reduction in arrestability. Alternatively, it can be stopped by a base material that does not decrease the arrestability of the adjacent surface due to the step d effect. In this case, it is not indispensable that the joints of all the surfaces are inclined joints, and that the joints between all the surfaces have steps. What is necessary is just to set the design conditions according to steel material conditions and load application conditions.

[0035]

According to the present invention, for a steel material having excellent arrestability, a welded joint having a good appearance and a good fit is formed at low cost. Propagation can be stopped at a very short length (within several tens of mm) by a base material having excellent arrestability, and brittle fracture can be prevented. For example, when the present invention is applied to a building structural member or a building structure, it is possible to secure a plastic deformation capability of the building member and to provide a building structural member or a building structure that is rich in earthquake resistance.

[Brief description of the drawings]

FIG. 1A is a three-dimensional explanatory view showing a crack generation situation near a joint formed by a conventional general welding joint for a thick steel plate having excellent arrestability. (B) The figure shows (a)
The three-dimensional explanatory view showing the propagation of the crack of the figure, and the brittle fracture situation.

FIG. 2 is a three-dimensional explanatory view showing an example of forming an inclined joint portion for a thick steel plate having excellent arrestability in the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a welding line inclination angle θ and a crack propagation distance a according to a hybrid ESSO test method.

FIG. 4 is a conceptual explanatory view showing an example of a hybrid ESSO test method.

FIG. 5 is a three-dimensional explanatory view showing another example of forming a welded joint for a thick steel plate having excellent arrestability in the present invention.

FIG. 6 is a three-dimensional explanatory view showing another example of forming a welded joint for a thick steel plate having excellent arrestability in the present invention.

FIG. 7 is a three-dimensional explanatory view showing another example of forming a welded joint for a thick steel plate having excellent arrestability in the present invention.

FIG. 8 (a) is a three-dimensional explanatory view showing an example in which the present invention is applied to a welding connection for constructing a rigid frame structure using a square steel tubular column and an H-shaped steel beam using a diaphragm through the present invention.
(B) Drawing is a plane explanatory view of A section of (a) figure.

FIG. 9 (a) is a three-dimensional explanatory view showing another embodiment in which the present invention is applied to a welding connection for constructing another rigid frame structure using a square steel tubular column and an H-shaped steel beam using a diaphragm through the present invention. . (B) Drawing is a plane explanatory view of B part of (a) figure.

FIG. 10 (a) is an elevational view showing an embodiment in which the present invention is applied to welding joining of a structural member using a square steel tubular column and an H-shaped steel beam. (B) Drawing is a plane explanatory view of (a) figure.

FIG. 11 (a) is an elevation elevational view showing an embodiment in which the present invention is applied to a welded joint for constructing a structural member composed of a circular steel pipe column and an H-shaped steel beam using a circular diaphragm.
(B) Drawing is a plane explanatory view of (a) figure.

FIG. 12 (a) is a front explanatory view showing an embodiment in which the present invention is applied to a welded joint for constructing a truss using a square steel pipe and a square steel pipe. (B) Drawing is a side explanatory view of (a) figure.

FIG. 13 (a) is a front explanatory view showing an embodiment in which the present invention is applied to a welding connection for constructing another truss using a circular steel pipe and a circular steel pipe. (B) Drawing is a side explanatory view of (a) figure.

FIG. 14 (a) is a three-dimensional explanatory view showing an embodiment in which the present invention is applied to welding of a rectangular steel pipe and a rectangular steel pipe by welding to obtain a long rectangular steel pipe column. FIG. 2B is a three-dimensional explanatory view showing a state in which the square steel pipe and the square steel pipe in FIG.

FIG. 15 (a) is a three-dimensional explanatory view showing an example in which the present invention is applied to welding of a rectangular steel pipe and a rectangular steel pipe by welding to obtain another long rectangular steel pipe column. (B)
(A) A three-dimensional explanatory view showing a state where a square steel pipe and a square steel pipe in the figure are welded and joined to form a square steel pipe column.

[Explanation of symbols]

1a, 1b: steel plate c: crack w:
Welding zc: brittle crack zz: brittle fracture zL:
Material axis cL: Line perpendicular to the material axis L: Length (distance) of welding line parallel to the material axis 2: Groove 3: Guide groove 4: Specimen 5: Notch 6:
Wedge-shaped tools 7a, 7b: bent portion (welding line) 8a, 8b, 8c, 8d: bent portion (welding line) 9: through diaphragm 91: inclined joint 10: square steel pipe 10a, 10b: square steel pipe 10k: corner 10p , 10q: inclined joint 10s: vertical joint 11: H-shaped steel beam 11
f: Flange 11u: Web 11c: Curved surface joint 12: Circular steel tube column 13: Circular diaphragm 14: Gusset plate 15: Bolt 16a, 16b: Square steel tube sw: Fillet weld 17: Circular steel tube 17p: Inclined joint ws: Weld (Vertical) wt: Welding (inclined)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takehiro Inoue 20-1 Shintomi, Futtsu-shi Nippon Steel Corporation Technology Development Division (72) Inventor Toshihiko Koseki 1 Nishi-nosu, Oita-shi Nippon Steel Corporation F-term in Oita Works (reference) 4E001 AA03 CA07 DF09

Claims (4)

[Claims] 1. A method for welding steel materials having excellent arrestability, wherein a welding line is inclined with respect to a line perpendicular to the material axis when welding steel materials having excellent arrestability. 2. When welding a steel material excellent in arrestability, a welding line is set at 20 degrees to 40 degrees with respect to a line orthogonal to the material axis.
The method for welding and joining steel materials having excellent arrestability according to claim 1, wherein the steel material is inclined at an angle. 3. A method for welding and joining steel materials having excellent arrestability, wherein the welding wire is bent at one or more locations when welding steel materials having excellent arrestability. 4. The method according to claim 1, wherein a part or all of the welding line is formed in a curved line.
The method for welding and joining steel materials having excellent arrestability according to the paragraph.