JPH11277227A - Welded structure of steel structure and method for welding steel structure - Google Patents
Welded structure of steel structure and method for welding steel structureInfo
- Publication number
- JPH11277227A JPH11277227A JP10080991A JP8099198A JPH11277227A JP H11277227 A JPH11277227 A JP H11277227A JP 10080991 A JP10080991 A JP 10080991A JP 8099198 A JP8099198 A JP 8099198A JP H11277227 A JPH11277227 A JP H11277227A
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- Prior art keywords
- welding
- strength
- steel
- welding method
- welded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、鋼構造物の溶接
構造及びその溶接工法の技術分野に属し、更に言えば、
鋼構造の柱梁接合部を溶接により接合する場合の溶接構
造及びその溶接工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a welding structure for steel structures and a welding method therefor.
The present invention relates to a welding structure when a beam-to-column joint of a steel structure is joined by welding and a welding method thereof.
【０００２】[0002]
【従来の技術】鉄骨造建築において、その柱梁接合部を
溶接により接合する場合には、柱梁接合部の梁端フラン
ジの溶接部及び溶接部近傍あるいはスカラップに起因す
る脆性的な破断が問題となっている。その対策として、
次に挙げるような公知技術が提案されている。 梁端をリブで補強する方法。 柱梁接合部の脆性的な破断の原因の一つとされるス
カラップを設けないで溶接を行う溶接工法。2. Description of the Related Art In a steel-frame building, when a beam-to-column joint is joined by welding, brittle breakage due to a welded portion of a beam end flange of a beam-to-column joint and the vicinity of the welded portion or scallop is a problem. It has become. As a countermeasure,
The following known techniques have been proposed. A method of reinforcing the beam ends with ribs. A welding method that performs welding without providing scallops, which is one of the causes of brittle fracture of beam-column joints.
【０００３】その他にも、下記に挙げるような公知技術
が提案されている。 特開平８−２８１４８６号公報には、鋼製柱梁接合
部を溶接する方法において、溶接する柱及び梁の降伏応
力及び引張強度未満の降伏応力及び引張強度を有する鋼
製裏当金を使用し、また、溶接材料には溶接により生成
される溶接金属の降伏応力及び引張強度が鋼製裏当金の
降伏応力及び引張強度以上となるものを用いて溶接する
鋼製柱梁接合部の溶接方法が開示されている。 特開平８−２８１４８７号公報には、鋼製柱梁接合
部を溶接する方法において、溶接する柱及び梁の降伏応
力及び引張強度以上の降伏応力及び引張強度を有する鋼
製裏当金を使用し、また、溶接材料には溶接により生成
される溶接金属の降伏応力及び引張強度が鋼製裏当金の
降伏応力及び引張強度未満となるものを用いて溶接する
鋼製柱梁接合部の溶接方法が開示されている。 昭和４７年１０月の日本造船学会秋季講演会におい
て発表された「軟質溶接継手の静的引張強度に関する研
究」の論文中に、母材より低強度の溶接金属を、Ｋ形開
先の溶接継手の中央部を初層として、該初層の形成に適
用した鋼構造物の構造及び溶接工法が開示されている。[0003] In addition, the following known techniques have been proposed. Japanese Patent Application Laid-Open No. 8-281486 discloses a method of welding a steel beam-column joint using a steel backing metal having a yield stress and a tensile strength less than a yield stress and a tensile strength of a column and a beam to be welded. In addition, a welding method for a steel beam-to-column joint in which welding is performed using a welding material having a yield stress and a tensile strength of a weld metal generated by welding equal to or higher than a yield stress and a tensile strength of a steel backing metal. Is disclosed. Japanese Patent Application Laid-Open No. 8-281487 discloses a method of welding a steel beam-to-column joint using a steel backing metal having a yield stress and a tensile strength higher than a yield stress and a tensile strength of a column and a beam to be welded. In addition, a welding method for a steel beam-to-column joint in which welding is performed using a welding material in which the yield stress and tensile strength of a weld metal generated by welding are less than the yield stress and tensile strength of a steel backing metal Is disclosed. In a paper on "Study on Static Tensile Strength of Soft Welded Joints" presented at the Autumn Meeting of the Shipbuilding Society of Japan in October 1972, a weld metal with lower strength than the base metal was welded with a K-shaped groove. The structure of a steel structure applied to the formation of the initial layer with the central portion of the steel layer as the initial layer and a welding method are disclosed.
【０００４】[0004]
【本発明が解決しようとする課題】上記の従来技術
は、溶接作業を終えた後にリブの取付け作業を行わなけ
ればならないから、手間がかかり、作業能率が低下して
コスト的にも高くつく。上記従来技術のスカラップを
設けない溶接工法は、その品質管理上、柱にブラケット
を予め工場等で溶接して接合するブラケット工法を採用
しなければならず、近年、コストダウン手法として定着
している、梁を柱に直接接合するノンブラケット工法を
採用できない。その結果としてコスト的に高くつく。In the above-mentioned prior art, since the work of mounting the ribs must be performed after the welding work is completed, it is troublesome, the work efficiency is reduced, and the cost is high. In the prior art welding method without scallops, in terms of quality control, a bracket method in which a bracket is welded to a pillar in advance at a factory or the like must be adopted, and has recently been established as a cost reduction method. The non-bracket method of directly joining the beam to the column cannot be adopted. As a result, it is costly.
【０００５】更に、上記の従来技術、及びその他多
くの従来技術、並びに一般的な公知技術では、溶接継手
の応力集中部（例えばレ形開先の溶接継手におけるルー
ト側の初層のような応力集中部）に高降伏点の溶接材料
を使用している（高降伏点の溶接金属が形成されてい
る。）。この場合、一般に破断の起点となる部分に蓄え
られ、破断時に開放される弾性歪エネルギーが、亀裂進
展速度や破壊形態に大きく影響することが指摘されてお
り、レ形開先の溶接継手におけるルート側の初層のよう
な応力集中部での高降伏点の溶接材料の使用は問題が多
い。つまり、溶接金属の降伏点を柱及び梁等の母材の降
伏点より高くすると、亀裂進展時に開放されるエネルギ
ーも大きくなり、脆性的な破壊になり易い。Further, in the above-mentioned prior art, and many other prior arts, and generally known art, a stress concentration portion of a welded joint (for example, a stress such as a first layer on the root side of a welded joint having a groove) is formed. A high yield point welding material is used for the concentrated portion) (high yield point weld metal is formed). In this case, it has been pointed out that the elastic strain energy, which is generally stored at the starting point of the fracture and released at the time of fracture, greatly affects the crack growth rate and the fracture mode. The use of high yield point welding consumables at stress concentrations, such as the first layer on the side, is problematic. That is, when the yield point of the weld metal is higher than the yield point of the base material such as a column or a beam, the energy released at the time of crack propagation increases, and brittle fracture is likely to occur.
【０００６】上記従来技術は、裏当金の降伏応力及び
引張強度を柱及び梁等の母材及び溶接金属の降伏応力及
び引張強度より小さくして、梁端フランジの溶接部及び
溶接部近傍の応力集中を緩和する構成であり、上記従来
技術では、裏当金の降伏応力及び引張強度を柱及び梁
等の母材及び溶接金属の降伏応力及び引張強度より大き
くして、梁端フランジの溶接部及び溶接部近傍の応力集
中を緩和する構成であり、それぞれ通常の鋼材を裏当金
として用いないので、コスト的に高くつく。In the above prior art, the yield stress and the tensile strength of the backing metal are made smaller than the yield stress and the tensile strength of the base material such as columns and beams and the weld metal, and the welded portion of the beam end flange and the vicinity of the welded portion are formed. In the prior art, the yield stress and the tensile strength of the backing metal are made larger than the yield stress and the tensile strength of the base material such as columns and beams and the weld metal, thereby welding the beam end flange. It is a configuration that alleviates stress concentration in the vicinity of the welded portion and the welded portion, and since ordinary steel is not used as a backing metal, it is costly.
【０００７】ところで従来、母材よりも低強度で高延性
の溶接材料（溶接金属）を用いた溶接法が、高張力鋼に
対し、予熱温度低減や溶接割れ等の防止に有効であるこ
とは知られており、それらの効果と母材による３軸拘束
効果による耐力向上に主眼が置かれている。しかし、溶
接部の全層に母材よりも低強度の溶接金属を適用した溶
接部の耐力は、母材の耐力よりも大きくはならず、柱及
び梁等の母材破断を原則とする建築分野では適用が困難
である。Conventionally, a welding method using a welding material (weld metal) having lower strength and higher ductility than the base metal is effective for reducing the preheating temperature and preventing welding cracks and the like for high-tensile steel. It is known, and the main focus is on these effects and the improvement of proof stress by the triaxial restraint effect of the base material. However, the strength of welds where the weld metal of lower strength than the base metal is applied to all layers of the weld does not become greater than the strength of the base metal, and the building where columns and beams break the base material in principle. It is difficult to apply in the field.
【０００８】上記の従来技術は、Ｋ形開先の溶接継手
の中央部に位置する初層のみを母材よりも低強度の溶接
金属で形成し、その他の層は、通常の溶接金属により溶
接し、予熱温度低減や溶接割れ等の防止の効果を持たせ
ると共に、Ｋ形開先の３軸拘束効果により溶接部の耐力
を十分なものとした構成である。しかし、現場作業を主
とする建築分野において、Ｋ形開先はあまり用いられな
い。In the above prior art, only the first layer located at the center of the K-shaped grooved welded joint is formed of a weld metal having a lower strength than the base metal, and the other layers are welded by a normal weld metal. In addition to the effects of reducing the preheating temperature and preventing welding cracks and the like, the K-shaped groove has a three-axis restraining effect to ensure a sufficient strength of the welded portion. However, the K-shaped groove is rarely used in the field of construction mainly for field work.
【０００９】次に、６００Ｎ／mm2 級の高張力鋼以上の
強度を有する鋼材（６００ Ｎ／mm2から７８０Ｎ／mm2
までの鋼材）に対しては、その強度よりも低い溶接金属
を形成する溶接材料は存在するものの、６００Ｎ／mm2
級の高張力鋼未満の強度を有する鋼材（４００Ｎ／mm2
から４９０Ｎ／mm2 までの鋼材）に対しては、その母材
よりも低強度の溶接金属を形成する溶接材料は存在しな
い。溶接構造用鋼材の降伏耐力は一般的な板厚で２４５
Ｎ／mm2 以上であり、それ以下の耐力を有する溶接金属
は、溶加材として２４５Ｎ／mm2 以下の降伏耐力の純鉄
材料を用いても、アーク溶接に伴う脱酸（Ｍｎ、Ｓｉの
添加）を行うプロセスにおいて耐力上昇を避けられない
からである。[0009] Next, 780N of steel (600 N / mm 2 with a high tensile steel or the strength of 600N / mm 2 class / mm 2
Up to 600 N / mm 2 , although there is a welding material that forms a weld metal lower than its strength
Steel material having a strength less than that of high-grade steel (400 N / mm 2
490 N / mm 2 to 490 N / mm 2 ), there is no welding material that forms a weld metal of lower strength than its base metal. The yield strength of welded steel is 245
N / mm 2 or more, and a welding metal having a proof strength of less than that, even if a pure iron material having a yield strength of 245 N / mm 2 or less is used as a filler metal, deoxidation (Mn, Si This is because an increase in proof stress cannot be avoided in the process of (addition).
【００１０】従って、本発明の目的は、予熱管理なしで
レ形開先の溶接継手におけるルート側の初層又は複数層
での溶接割れ等を防止できる溶接を行え、該レ形開先の
溶接継手におけるルート側の初層又は複数層などの応力
集中部の応力集中を緩和でき、地震等の外力が作用する
場合に生じる柱梁接合部の梁端フランジの溶接部及び溶
接部近傍の脆性的な破断を防止できると共に、溶接作業
を能率良く行え、コストが安い、鋼構造物の溶接構造及
び鋼構造物の溶接工法を提供することにある。[0010] Accordingly, an object of the present invention is to perform welding capable of preventing welding cracks or the like in the first layer or a plurality of layers on the root side of a welded groove-shaped welded joint without preheating management. It can reduce the stress concentration at the stress concentration part such as the first layer or multiple layers on the root side of the joint, and the brittleness near the welded part of the beam end flange of the beam-column joint and the welded part generated when external force such as earthquake acts Another object of the present invention is to provide a welding structure for a steel structure and a method for welding a steel structure, which can prevent a severe breakage, can perform a welding operation efficiently, and is inexpensive.
【００１１】本発明の更なる目的は、６００Ｎ／mm2 級
の高張力鋼未満の強度を有する鋼材よりも低強度で高延
性の溶接金属を形成することにより、母材に６００ Ｎ
／mm2級の高張力鋼未満の強度を有する鋼材を使用して
も実施できる、鋼構造物の溶接工法を提供することにあ
る。[0011] It is a further object of the present invention to form a weld metal having a lower strength and a higher ductility than a steel material having a strength lower than that of a high-strength steel of 600 N / mm 2 class, thereby forming a base metal having a strength of 600 N / mm 2.
An object of the present invention is to provide a welding method for a steel structure, which can be performed even when using a steel material having a strength lower than high-strength steel of / mm 2 class.
【００１２】[0012]
【課題を解決するための手段】上記課題を解決するため
の手段として、請求項１に記載した発明に係る鋼構造物
の溶接構造は、鋼構造物のレ形開先の溶接継手における
ルート側の初層又は複数層が、母材より低強度で高延性
の溶接金属で形成され、その余の層が母材と同等又はそ
れ以上の強度を有する溶接金属で形成されていることを
特徴とする。According to a first aspect of the present invention, there is provided a welding structure for a steel structure, the method comprising: The first layer or a plurality of layers are formed of a weld metal having lower strength and higher ductility than the base material, and the remaining layers are formed of a weld metal having a strength equal to or higher than that of the base material. I do.
【００１３】請求項２に記載した発明に係る鋼構造物の
溶接工法は、鋼構造物のレ形開先の溶接継手におけるル
ート側の初層を、ＭＡＧ溶接法又はＭＩＧ溶接法によ
り、母材より低強度で高延性の溶接材料で溶接し、その
余の層は前記同様ＭＡＧ溶接法又はＭＩＧ溶接法、或い
はＴＩＧ溶接法により、母材と同等又はそれ以上の強度
を有する溶接材料で溶接することを特徴とする。According to a second aspect of the present invention, there is provided a method for welding a steel structure, wherein the first layer on the root side of the welded joint of the groove of the steel structure is formed by a MAG welding method or a MIG welding method. Weld with lower strength and high ductility welding material, and the other layers with MAG welding method or MIG welding method or TIG welding method as above, with welding material having the same or higher strength as the base material. It is characterized by the following.
【００１４】請求項３に記載した発明に係る鋼構造物の
溶接工法は、鋼構造物のレ形開先の溶接継手におけるル
ート側の初層又は複数層を、ＴＩＧ溶接法により母材よ
り低強度で高延性の溶接材料で溶接し、その余の層は前
記同様ＴＩＧ溶接法、或いはＭＡＧ溶接法又はＭＩＧ溶
接法により、母材と同等又はそれ以上の強度を有する溶
接材料で溶接することを特徴とする。According to a third aspect of the present invention, there is provided a method for welding a steel structure, wherein the first layer or the plurality of layers on the root side of the welded joint of the groove of the steel structure is lower than the base material by the TIG welding method. Weld with a high-strength, high-ductility welding material, and use the TIG welding method, MAG welding method, or MIG welding method to weld the remaining layers with a welding material having a strength equal to or greater than that of the base material as described above. Features.
【００１５】請求項４に記載した発明は、請求項２又は
３に記載した鋼構造物の溶接工法において、母材に６０
０Ｎ／mm2 級の高張力鋼未満の強度を有する鋼材を用
い、該鋼材を炭酸ガス又はアルゴンガスと炭酸ガスの混
合ガス等の活性ガス雰囲気中、或いはアルゴンガス等の
不活性ガス雰囲気中で、炭素含有量が０．０１％以下、
珪素含有量が０．０２％以下、マンガン含有量が０．２
％以下、リン含有量が０．０１％以下、硫黄含有量が
０．０１％以下の工業用純鉄を溶加材として用い、該工
業用純鉄をアーク熱により溶融し凝固させることによ
り、母材より低強度で高延性の溶接金属を鋼構造物のレ
形開先の溶接継手におけるルート側の初層又は複数層に
形成することを特徴とする。According to a fourth aspect of the present invention, there is provided a method for welding a steel structure according to the second or third aspect, wherein
A steel material having a strength of less than 0 N / mm 2 class high-strength steel is used, and the steel material is placed in an active gas atmosphere such as carbon dioxide gas or a mixed gas of argon gas and carbon dioxide gas, or in an inert gas atmosphere such as argon gas. , The carbon content is 0.01% or less,
Silicon content is 0.02% or less, manganese content is 0.2
% Or less, a phosphorus content of 0.01% or less, and a sulfur content of 0.01% or less by using industrial pure iron as a filler material, and melting and solidifying the industrial pure iron by arc heat. It is characterized in that a weld metal having lower strength and higher ductility than the base metal is formed in the first layer or a plurality of layers on the root side of the welded joint of the groove-shaped groove of the steel structure.
【００１６】[0016]
【発明の実施形態及び実施例】請求項１記載の発明に係
る鋼構造物の溶接構造は、図１〜図６に示したように、
鉄骨柱２に鉄骨梁３を溶接により接合する場合に、鉄骨
梁３のフランジ部３ａの一端部に形成されたレ形開先１
の溶接継手におけるルート側の初層又は複数層１ａが、
鉄骨柱２及び鉄骨梁３等の母材よりも低強度で高延性の
溶接金属が形成され、その余の層１ｂが全て鉄骨柱２及
び鉄骨梁３等の母材と同等又はそれ以上の強度を有する
溶接金属で形成されている。図中の符号４は裏当金、符
号５はスカラップである。BEST MODE FOR CARRYING OUT THE INVENTION A welding structure for a steel structure according to the invention as set forth in claim 1 has a structure as shown in FIGS.
When the steel beam 3 is joined to the steel column 2 by welding, the groove 1 formed at one end of the flange 3a of the steel beam 3
The first layer or multiple layers 1a on the root side of the welded joint of
A weld metal with lower strength and higher ductility is formed than the base material such as the steel column 2 and the steel beam 3, and the remaining layers 1 b are all equal in strength to or higher than the base material such as the steel column 2 and the steel beam 3. Is formed of a weld metal having Reference numeral 4 in the figure is a backing money, and reference numeral 5 is a scallops.
【００１７】図１〜図３に示した実施例は、鉄骨柱２の
側面に鉄骨梁３のフランジ部３ａの一端部を本発明の溶
接工法で直接溶接して接合するノンブラケット工法のタ
イプを示している。図２の実施例では、通常の裏当金４
を使用している。図３の実施例では、レ形開先１の溶接
継手におけるルート側の初層又は複数層１ａを形成する
ために予め切欠部４ａを設けた裏当金４を使用してい
る。The embodiment shown in FIGS. 1 to 3 is of a non-bracket type in which one end of a flange 3a of a steel beam 3 is directly welded to the side surface of a steel column 2 by a welding method of the present invention. Is shown. In the embodiment of FIG.
You are using In the embodiment of FIG. 3, the backing metal 4 provided with the notch 4a in advance is used to form the first layer or the plurality of layers 1a on the root side in the welded joint of the grooved groove 1.
【００１８】図４〜図６に示した実施例は、予め工場等
において鉄骨柱２へブラケット３’のフランジ部３’ａ
を溶接しておいて、現場で前記ブラケット３’を利用し
て鉄骨柱２と鉄骨梁３とを本発明の溶接工法で接合する
ブラケット工法のタイプを示している。図５の実施例で
は、通常の裏当金４を使用している。図６の実施例で
は、レ形開先１の溶接継手におけるルート側の初層又は
複数層１ａを形成するために予め切欠部４ａを設けた裏
当金４を使用している。In the embodiment shown in FIGS. 4 to 6, the flange 3'a of the bracket 3 'is previously attached to the steel column 2 in a factory or the like.
Is shown, and the steel column 2 and the steel beam 3 are joined by the welding method of the present invention using the bracket 3 ′ at the site. In the embodiment of FIG. 5, a normal backing metal 4 is used. In the embodiment of FIG. 6, a backing metal 4 provided with a notch 4a in advance is used to form the first layer or a plurality of layers 1a on the root side in the welded joint of the grooved groove 1.
【００１９】上記の溶接構造を実現する溶接工法は、大
きく、以下の２種の溶接工法に分けて実施される。第１
の溶接工法は、請求項２記載の発明に係るもので、鋼構
造物のレ形開先１の溶接継手におけるルート側の初層１
ａのみを、ＭＡＧ溶接法又はＭＩＧ溶接法により、鉄骨
柱２及び鉄骨梁３等の母材より低強度で高延性の溶接材
料で溶接し、その余の層１ｂは全て、前記同様のＭＡＧ
溶接法又はＭＩＧ溶接法、或いはＴＩＧ溶接法のいずれ
かにより、鉄骨柱２及び鉄骨梁３等の母材と同等又はそ
れ以上の強度を有する溶接材料で溶接するのである。The welding method for realizing the above-mentioned welding structure is roughly divided into the following two welding methods. First
The welding method according to the second aspect of the present invention relates to the first layer 1 on the root side of the weld joint of the groove 1 of the steel structure.
a is welded by a MAG welding method or a MIG welding method with a welding material having a lower strength and a higher ductility than the base material such as the steel column 2 and the steel beam 3, and the other layers 1b are all MAG similar to the above.
Welding is performed using a welding material having a strength equal to or higher than that of the base material such as the steel column 2 and the steel beam 3 by any of the welding method, the MIG welding method, and the TIG welding method.
【００２０】第２の溶接工法は、請求項３記載の発明に
係るもので、鋼構造物のレ形開先１の溶接継手における
ルート側の初層又は複数層１ａを、ＴＩＧ溶接法により
鉄骨柱２及び鉄骨梁３等の母材より低強度で高延性の溶
接材料で溶接し、その余の層１ｂはすべて、前記同様の
ＴＩＧ溶接法、或いはＭＡＧ溶接法又はＭＩＧ溶接法の
いずれかにより鉄骨柱２及び鉄骨梁３等の母材と同等又
はそれ以上の強度を有する溶接材料で溶接するのであ
る。The second welding method according to the third aspect of the present invention relates to the invention described in claim 3, wherein the first layer or the plurality of layers 1a on the root side of the weld joint of the grooved groove 1 of the steel structure is formed by a TIG welding method. Welding is performed with a welding material having a lower strength and a higher ductility than the base material such as the column 2 and the steel beam 3, and all the remaining layers 1b are formed by the same TIG welding method, MAG welding method or MIG welding method as described above. The welding is performed with a welding material having a strength equal to or higher than that of the base material such as the steel column 2 and the steel beam 3.
【００２１】上記２種の溶接工法を比較すると、第２の
溶接工法よりも第１の溶接工法の方が施工能率は良い。
しかし、母材より低強度で高延性の溶接材料をレ形開先
１の溶接継手における初層のみに溶接する第１の溶接工
法よりも、同材料を初層のみならず複数層まで溶接する
第２の溶接工法の方が、設計どおり精巧に溶接すること
に関しては優れている。しかし、その他に関しては前記
両者の奏する効果に差異はない。Comparing the above two welding methods, the first welding method is more efficient than the second welding method.
However, compared to the first welding method in which a welding material having a lower strength and a higher ductility than the base material is welded only to the first layer in the weld joint of the groove 1, the same material is welded not only to the first layer but also to a plurality of layers. The second welding method is superior in welding precisely as designed. However, in other respects, there is no difference between the above-mentioned effects.
【００２２】上記２種の溶接工法で鉄骨柱２及び鉄骨梁
３等の母材に６００Ｎ／mm2 級の高張力鋼以上の強度を
有する鋼材を用いる場合、例えば、母材に６００Ｎ／mm
2 級の鋼材を用い、前記溶接材料として、降伏耐力が２
４５Ｎ／mm2 の工業用純鉄を用いて、レ形開先１の溶接
継手におけるルート側の初層又は複数層１ａの溶接金属
を厚さにして梁３のフランジ部の厚さの１／３まで形成
する。[0022] When using a steel having a high tensile steel or the strength of 600N / mm 2 class in the base material such as a steel column 2 and steel beam 3 by welding method of the two, for example, 600N / mm in the base material
Using a grade 2 steel material, the yield strength is 2
Using 45 N / mm 2 of industrial pure iron, the thickness of the weld metal of the first layer or the plurality of layers 1 a on the root side in the welded joint of the grooved groove 1 is reduced to 1 / th of the thickness of the flange portion of the beam 3. Form up to 3.
【００２３】上記２種の溶接工法で鉄骨柱２及び鉄骨梁
３等の母材に６００Ｎ／mm2 級の高張力鋼未満の強度を
有する鋼材を用いる場合、該鋼材を炭酸ガス又はアルゴ
ンガスと炭酸ガスの混合ガス等の活性ガス雰囲気中、或
いはアルゴンガス等の不活性ガス雰囲気中で、炭素含有
量が０．０１％以下、珪素含有量が０．０２％以下、マ
ンガン含有量が０．２％以下、リン含有量が０．０１％
以下、硫黄含有量が０．０１％以下の工業用純鉄を溶加
材として用い、該工業用純鉄をアーク熱により溶融させ
凝固させることにより、柱２及び梁３等の母材よりも低
強度で高延性の溶接金属を、鋼構造物のレ形開先１の溶
接継手におけるルート側の初層又は複数層１ａに形成す
ることができる。前記溶接金属は、降伏耐力が２４５Ｎ
／mm2 以下で、引張強さが４００Ｎ／mm2 以下である。When a steel material having a strength of less than 600 N / mm 2 class high-strength steel is used as a base material such as the steel column 2 and the steel beam 3 by the above two welding methods, the steel material is replaced with carbon dioxide gas or argon gas. In an active gas atmosphere such as a mixed gas of carbon dioxide gas or an inert gas atmosphere such as an argon gas, the carbon content is 0.01% or less, the silicon content is 0.02% or less, and the manganese content is 0.1% or less. 2% or less, phosphorus content 0.01%
Hereinafter, the industrial pure iron having a sulfur content of 0.01% or less is used as a filler metal, and the industrial pure iron is melted and solidified by arc heat to obtain a solid material that is less than the base material such as the column 2 and the beam 3. A low-strength, high-ductility weld metal can be formed in the first layer or the plurality of layers 1a on the root side in the welded joint of the grooved groove 1 of the steel structure. The weld metal has a yield strength of 245N.
/ Mm 2 or less, and the tensile strength is 400 N / mm 2 or less.
【００２４】以下に、本発明に係る溶接工法を実施した
鋼構造物の溶接構造の実験結果を示す。 実験データ１：母材劣化防止効果及び溶接部の変形能力
向上について 脆性破壊の一つの指標であるＣＴＯＤ試験（−５０〜−
３０゜Ｃで実施）では、上記した低強度で高延性の溶接
材料を用いた試験体（溶接構造）の亀裂開口変位は、通
常の溶接工法の試験体に比べて、熱影響部で１．５倍、
溶接部で約３倍となり、母材劣化効果及び溶接部の変形
能力向上の効果を確認できた。The experimental results of the welding structure of the steel structure to which the welding method according to the present invention was applied are shown below. Experimental data 1: Effect of base metal deterioration prevention and improvement of weldability deformation ability CTOD test (-50 to-
At 30 ° C.), the crack opening displacement of the specimen (welded structure) using the low-strength and high-ductility welding material described above was 1.1 in the heat-affected zone as compared with the specimen of the ordinary welding method. 5 times,
It was about three times as large at the welded portion, confirming the effect of deteriorating the base metal and improving the deformability of the welded portion.
【００２５】実験データ２：母材劣化防止効果について 脆性破壊の一つの指標である硬さ試験において、上記し
た低強度で高延性の溶接材料を用いた試験体の硬さは、
通常の溶接工法の試験体のそれに比べて１０〜２０％低
下し、母材劣化を防止していることを確認できた。 実験データ３：母材破断保証について 母材破断を確認するためにルート側の初層又は複数層に
母材よりも低強度で高延性の溶接金属を有するレ形開先
の溶接継手（本発明の溶接継手）の引張実験を行った。
母材には４９０Ｎ／mm2 級の鋼材を用いた。この場合、
板厚（鉄骨梁３のフランジ厚）ｔのｔ／６だけ低強度で
高延性の溶接材料を適用した試験体では、母材破断が確
認された。また、板厚（鉄骨梁３のフランジ厚）ｔのｔ
／３だけ低強度で高延性の溶接材料を適用した試験体で
は、引張強さは母材の引張強さのＪＩＳ規格値を超えて
いるが、溶接部破断となり、母材破断と溶接部破断の分
岐点であることを確認できた。以上より、母材に４９０
Ｎ／mm2 級の鋼材を用いた場合、板厚（鉄骨梁３のフラ
ンジ厚）ｔのｔ／３未満の範囲まで本発明に係る溶接工
法（レ形開先１の溶接継手におけるルート側の初層又は
複数層１ａを母材より低強度で高延性の溶接金属で形
成）を実施すれば、母材破断することが確認された。ｔ
／３未満であれば本発明の効果を発揮し、母材が破断す
る。通常、１層の厚さは５mm程度の溶接で構成されるこ
とが多いため、板厚（鉄骨梁３のフランジ厚）が２０mm
以上あれば、本発明の溶接工法を適用できる。Experimental data 2: Base metal deterioration prevention effect In a hardness test, which is one index of brittle fracture, the hardness of a test piece using the above-described low-strength and high-ductility welding material is as follows.
It was 10 to 20% lower than that of the test piece of the normal welding method, and it was confirmed that the deterioration of the base material was prevented. Experimental data 3: Assurance of base metal fracture In order to confirm base metal fracture, a welded joint with a groove-shaped groove having a weld metal of lower strength and higher ductility than the base metal in the first layer or multiple layers on the root side (the present invention) (Welded joints) were subjected to a tensile test.
490 N / mm 2 grade steel was used as the base material. in this case,
In a test body to which a welding material having low strength and high ductility was applied by t / 6 of the plate thickness (flange thickness of the steel beam 3) t, base material fracture was confirmed. In addition, t of plate thickness (flange thickness of steel beam 3) t
In the test specimen to which a low-strength and high-ductility welding material was applied, the tensile strength exceeded the JIS standard value of the base metal tensile strength, but the weld was broken, and the base metal and the weld were broken. Could be confirmed. From the above, the base material was 490
When a steel material of N / mm 2 class is used, the welding method according to the present invention (the root side of the welded joint of the groove 1) up to a range of less than t / 3 of the plate thickness (flange thickness of the steel beam 3) t. When the first layer or the plurality of layers 1a were formed of a weld metal having lower strength and higher ductility than the base material), the base material was confirmed to break. t
If it is less than / 3, the effect of the present invention is exhibited, and the base material is broken. Normally, the thickness of one layer is often constituted by welding of about 5 mm, so that the plate thickness (the flange thickness of the steel beam 3) is 20 mm.
With the above, the welding method of the present invention can be applied.
【００２６】裏当金４の形態が対応する図３又は図６の
実施例では、レ形開先１の溶接継手のルート側の初層又
は複数層１ａを、図示したように鉄骨梁３と裏当金４と
の境界までしか溶接していないが、この限りではない。
母材の強度、板厚（鉄骨梁３のフランジ厚）や裏当金４
の切欠部の大きさなどに応じて、それぞれに適した範囲
で実施される。In the embodiment shown in FIG. 3 or FIG. 6 to which the form of the backing metal 4 corresponds, the first layer or the plurality of layers 1a on the root side of the welded joint of the groove 1 is connected to the steel beam 3 as shown. Welding is performed only up to the boundary with the backing metal 4, but is not limited to this.
Base material strength, plate thickness (flange thickness of steel beam 3) and backing metal 4
Depending on the size of the notch and the like, it is performed in a range suitable for each.
【００２７】[0027]
【本発明の奏する効果】本発明に係る鋼構造物の溶接構
造及び鋼構造物の溶接工法によれば、予熱管理なしでレ
形開先の溶接継手におけるルート側の初層又は複数層で
の溶接割れ等を防止する溶接が行え、該レ形開先の溶接
継手におけるルート側の初層又は複数層などの応力集中
部における応力集中を緩和して、地震等の外力が作用す
る場合に生じる柱梁接合部の梁端フランジの溶接部及び
溶接部近傍の脆性的な破断を防止できる。また、溶接作
業を能率良く行え、安いコストで実施できる。According to the welding structure for a steel structure and the method for welding a steel structure according to the present invention, the first or multiple layers on the root side of a welded joint having a groove-shaped groove without preheating management can be used. Welding can be performed to prevent welding cracks, etc., and the stress concentration at the stress concentration part such as the first layer or the plurality of layers on the root side of the welded joint of the concave groove is reduced, and this occurs when external force such as an earthquake acts. It is possible to prevent brittle breakage in the welded portion of the beam end flange of the beam-column joint and in the vicinity of the welded portion. In addition, the welding operation can be performed efficiently and at a low cost.
【００２８】更に、本発明に係る鋼構造物の溶接工法の
内、母材に６００Ｎ／mm2 級の高張力鋼未満の強度を有
する鋼材を用いる場合の溶接工法によれば、従来存在し
なかった６００Ｎ／mm2 級の高張力鋼未満の強度を有す
る鋼材よりも低強度の溶接金属を形成できるので、柱や
梁等の母材に６００Ｎ／mm2 級の高張力鋼未満の強度を
有する鋼材を用いても本発明に係る鋼構造物の溶接構造
を実施することができる。Further, according to the welding method for a steel structure according to the present invention, according to the welding method using a steel material having a strength of less than 600 N / mm 2 class high-strength steel as a base material, there is no conventional method. Welding metal can be formed with a lower strength than a steel material having a strength less than 600 N / mm 2 class high-strength steel, and therefore has a strength less than 600 N / mm 2 class high-strength steel for base materials such as columns and beams. Even if a steel material is used, the welding structure for a steel structure according to the present invention can be implemented.
【図１】ノンブラケット工法タイプに本発明を実施した
鋼構造物の溶接構造を示した正面図である。FIG. 1 is a front view showing a welded structure of a steel structure in which the present invention is applied to a non-bracket method.
【図２】図１のＸ部の拡大図である。FIG. 2 is an enlarged view of a portion X in FIG.
【図３】図１のＸ部の異なる実施例の拡大図である。FIG. 3 is an enlarged view of a different embodiment of a part X in FIG. 1;
【図４】ブラケット工法タイプに本発明を実施した鋼構
造物の溶接構造を示した正面図である。FIG. 4 is a front view showing a welding structure of a steel structure in which the present invention is applied to a bracket method.
【図５】図４のＸ’部の拡大図である。FIG. 5 is an enlarged view of a portion X ′ in FIG. 4;
【図６】図４のＸ’部の異なる実施例の拡大図である。FIG. 6 is an enlarged view of a different embodiment of a part X ′ of FIG. 4;
１ レ形開先 １ａ ルート側の初層又は複数層 １ｂ 余の層 1 Re-groove 1a First layer or multiple layers on the root side 1b Additional layers
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２３Ｋ 35/30 ３２０ Ｂ２３Ｋ 35/30 ３２０Ｆ Ｃ２２Ｃ 38/00 ３０１ Ｃ２２Ｃ 38/00 ３０１Ｙ 38/04 38/04 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B23K 35/30 320 B23K 35/30 320F C22C 38/00 301 C22C 38/00 301Y 38/04 38/04
Claims (4)
ート側の初層又は複数層が、母材より低強度で高延性の
溶接金属で形成され、その余の層が母材と同等又はそれ
以上の強度を有する溶接金属で形成されていることを特
徴とする、鋼構造物の溶接構造。A first layer or a plurality of layers on the root side of a welded joint of a groove-shaped groove of a steel structure is formed of a weld metal having a lower strength and a higher ductility than a base metal, and the remaining layers are formed of a base metal and a base metal. A welded structure for a steel structure, wherein the welded structure is formed of a weld metal having the same or higher strength.
ート側の初層を、ＭＡＧ溶接法又はＭＩＧ溶接法によ
り、母材より低強度で高延性の溶接材料で溶接し、その
余の層は前記同様ＭＡＧ溶接法又はＭＩＧ溶接法、或い
はＴＩＧ溶接法により、母材と同等又はそれ以上の強度
を有する溶接材料で溶接することを特徴とする、鋼構造
物の溶接工法。2. The method according to claim 1, wherein the first layer on the root side of the welded joint of the groove of the steel structure is welded by a MAG welding method or a MIG welding method with a welding material having a lower strength and a higher ductility than the base material. Is welded by a MAG welding method, a MIG welding method, or a TIG welding method with a welding material having a strength equal to or higher than that of the base material as described above.
ート側の初層又は複数層を、ＴＩＧ溶接法により母材よ
り低強度で高延性の溶接材料で溶接し、その余の層は前
記同様ＴＩＧ溶接法、或いはＭＡＧ溶接法又はＭＩＧ溶
接法により、母材と同等又はそれ以上の強度を有する溶
接材料で溶接することを特徴とする、鋼構造物の溶接工
法。3. A root layer-side first layer or a plurality of layers in a welded joint of a groove-shaped groove of a steel structure is welded by a TIG welding method with a welding material having a lower strength and a higher ductility than a base material, and the remaining layers. Is a method for welding a steel structure by using a TIG welding method, a MAG welding method, or a MIG welding method as described above, using a welding material having a strength equal to or higher than that of the base material.
強度を有する鋼材を用い、該鋼材を炭酸ガス又はアルゴ
ンガスと炭酸ガスの混合ガス等の活性ガス雰囲気中、或
いはアルゴンガス等の不活性ガス雰囲気中で、炭素含有
量が０．０１％以下、珪素含有量が０．０２％以下、マ
ンガン含有量が０．２％以下、リン含有量が０．０１％
以下、硫黄含有量が０．０１％以下の工業用純鉄を溶加
材として用い、該工業用純鉄をアーク熱により溶融し凝
固させることにより、母材より低強度で高延性の溶接金
属を鋼構造物のレ形開先の溶接継手におけるルート側の
初層又は複数層に形成することを特徴とする、請求項２
又は３に記載した鋼構造物の溶接工法。4. A steel material having a strength of less than 600 N / mm 2 class high-strength steel is used as a base material, and the steel material is placed in an active gas atmosphere such as carbon dioxide gas or a mixed gas of argon gas and carbon dioxide gas, or argon gas. In an inert gas atmosphere such as the above, the carbon content is 0.01% or less, the silicon content is 0.02% or less, the manganese content is 0.2% or less, and the phosphorus content is 0.01%.
In the following, a weld metal having lower strength and higher ductility than the base metal is obtained by using industrial pure iron having a sulfur content of 0.01% or less as a filler material and melting and solidifying the industrial pure iron by arc heat. 3 is formed on the first layer or a plurality of layers on the root side of the welded joint of the grooved groove of the steel structure.
Or the welding method of steel structure described in 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08099198A JP3820493B2 (en) | 1998-03-27 | 1998-03-27 | Welding method for steel structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08099198A JP3820493B2 (en) | 1998-03-27 | 1998-03-27 | Welding method for steel structures |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11277227A true JPH11277227A (en) | 1999-10-12 |
| JP3820493B2 JP3820493B2 (en) | 2006-09-13 |
Family
ID=13733979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08099198A Expired - Fee Related JP3820493B2 (en) | 1998-03-27 | 1998-03-27 | Welding method for steel structures |
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| JP (1) | JP3820493B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013022599A (en) * | 2011-07-15 | 2013-02-04 | Nippon Steel & Sumitomo Metal Corp | Weld joint structure of steel |
| JP2015091599A (en) * | 2013-10-03 | 2015-05-14 | 新日鐵住金株式会社 | Weld joint, and manufacturing method for weld joint |
| WO2017130830A1 (en) * | 2016-01-29 | 2017-08-03 | Ｊｆｅスチール株式会社 | Weld joint and method for producing same |
| WO2020090939A1 (en) * | 2018-10-31 | 2020-05-07 | 旭化成建材株式会社 | Square steel pipe and method of welding square steel pipe |
-
1998
- 1998-03-27 JP JP08099198A patent/JP3820493B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013022599A (en) * | 2011-07-15 | 2013-02-04 | Nippon Steel & Sumitomo Metal Corp | Weld joint structure of steel |
| JP2015091599A (en) * | 2013-10-03 | 2015-05-14 | 新日鐵住金株式会社 | Weld joint, and manufacturing method for weld joint |
| WO2017130830A1 (en) * | 2016-01-29 | 2017-08-03 | Ｊｆｅスチール株式会社 | Weld joint and method for producing same |
| JPWO2017130830A1 (en) * | 2016-01-29 | 2018-02-01 | Ｊｆｅスチール株式会社 | Welded joint and its manufacturing method |
| TWI630054B (en) * | 2016-01-29 | 2018-07-21 | 杰富意鋼鐵股份有限公司 | Welding joint and manufacturing method thereof |
| CN108602152A (en) * | 2016-01-29 | 2018-09-28 | 杰富意钢铁株式会社 | Welded joint and its manufacturing method |
| WO2020090939A1 (en) * | 2018-10-31 | 2020-05-07 | 旭化成建材株式会社 | Square steel pipe and method of welding square steel pipe |
| KR20210066877A (en) * | 2018-10-31 | 2021-06-07 | 아사히 가세이 겐자이 가부시키가이샤 | Rectangular steel pipe and welding method of rectangular steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3820493B2 (en) | 2006-09-13 |
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