JP5521632B2 - Thick steel plate welding method - Google Patents
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- 238000003466 welding Methods 0.000 title claims description 164
- 229910000831 Steel Inorganic materials 0.000 title claims description 41
- 239000010959 steel Substances 0.000 title claims description 41
- 238000000034 method Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims description 9
- 230000035515 penetration Effects 0.000 description 8
- 238000009863 impact test Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
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- 238000000576 coating method Methods 0.000 description 1
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- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Description
本発明は、板厚３０ｍｍ以上の厚鋼板の溶接方法に関し、詳しくは、ＵＯＥ鋼管、スパイラル鋼管などの大径鋼管の造管溶接に用いて好適なものに関する。 The present invention relates to a method for welding thick steel plates having a thickness of 30 mm or more, and more particularly, to a method suitable for pipe making welding of large diameter steel pipes such as UOE steel pipes and spiral steel pipes.
大径鋼管の造管溶接（シーム溶接）には２電極以上のサブマージアーク溶接が適用されている。パイプ生産能率向上の観点から鋼管の内面側を１パス、外面側を１パスで溶接する両面一層盛り溶接が一般的で、高能率な溶接施工がなされている（例えば特許文献１，２）。 Submerged arc welding with two or more electrodes is applied to pipe making welding (seam welding) of large diameter steel pipes. From the viewpoint of improving pipe production efficiency, double-sided single-layer welding, in which the inner surface side of the steel pipe is welded with one pass and the outer surface side with one pass, is commonly performed, and highly efficient welding is performed (for example, Patent Documents 1 and 2).
両面一層溶接では内面溶接金属と外面溶接金属が重なり未溶融部がないように十分な溶け込み深さを確保するため、１０００Ａ以上の大電流を適用して溶接を行うのが一般的で、能率と欠陥抑制を重視することで、溶接入熱が過剰となり、溶接部特に溶接熱影響部の靭性が劣化する問題がある。 In double-sided single-layer welding, in order to ensure a sufficient penetration depth so that the inner surface weld metal and the outer surface weld metal overlap and there is no unmelted portion, it is common to perform welding by applying a large current of 1000 A or more. By placing emphasis on defect suppression, there is a problem that welding heat input becomes excessive and the toughness of the welded portion, particularly the welded heat affected zone, deteriorates.
特許文献３には、溶接熱影響部の靭性劣化を防止するため、溶接入熱を低減する方法として、高電流密度でのサブマージアーク溶接方法が提案されている。 Patent Document 3 proposes a submerged arc welding method at a high current density as a method for reducing welding heat input in order to prevent toughness deterioration of the weld heat affected zone.
特許文献４には、板厚３０ｍｍを超える肉厚の鋼板を溶接する際に溶接入熱を抑制するため多パス溶接とすることが提案されている。 Patent Document 4 proposes multi-pass welding in order to suppress welding heat input when welding a steel plate having a thickness exceeding 30 mm.
大径鋼管のシーム溶接において溶接熱影響部の靭性劣化を抑制するためには、溶接入熱を低減することが効果的であることが知られている。しかしながら特許文献３記載の方法では一般的に板厚が１５〜２０ｍｍの場合、入熱が３〜６ｋＪ／ｍｍ程度の従来法と比べて低入熱化できるものの、板厚の大きな鋼材を溶接する際には入熱が高くなり、マイナス４０℃レベルの靭性を求められる場合には溶接熱影響部の靭性を確保することができない場合があるという問題があった。また、高電流密度溶接は余盛が高くなる問題があり、例えば製管後にコーティングを施すような場合には切削の工程が必要となり能率が低下する。 In seam welding of large diameter steel pipes, it is known that it is effective to reduce welding heat input in order to suppress toughness deterioration of the weld heat affected zone. However, in the method described in Patent Document 3, generally, when the plate thickness is 15 to 20 mm, the heat input can be reduced as compared with the conventional method in which the heat input is about 3 to 6 kJ / mm, but a steel material having a large plate thickness is welded. In some cases, the heat input becomes high, and when toughness of minus 40 ° C. is required, the toughness of the weld heat affected zone may not be ensured. In addition, high current density welding has a problem that the surplus is increased. For example, when coating is performed after pipe forming, a cutting process is required and efficiency is lowered.
また、特許文献４記載の方法は上記問題を解決しうるものであるが、多パス溶接であるため生産能率が低下する問題があった。 Moreover, although the method of patent document 4 can solve the said problem, since it was multipass welding, there existed a problem that production efficiency fell.
そこで、本発明は、内外面１層盛溶接で生産能率を損なうことなく、溶接入熱を従来より大きく低減し、溶接熱影響部で優れた靭性を得る厚鋼板の溶接方法を提供することを目的とする。 Therefore, the present invention provides a method for welding thick steel plates that greatly reduces welding heat input and obtains excellent toughness in the weld heat affected zone without impairing the production efficiency by inner and outer surface single layer welding. Objective.
本発明者らは、３０ｍｍ以上の板厚の鋼材を対象として、内外面１層盛溶接の低入熱化の方法を種々検討した。その結果、ガスシールドアーク溶接とサブマージアーク溶接とを複合して使用し、さらにサブマージアーク溶接の入熱を適正な範囲に制御することにより、溶接入熱を従来より大きく低減し、溶接熱影響部で優れた靭性を得ることができることを見出した。 The present inventors have studied various methods for reducing the heat input of inner and outer surface single-layer welding for steel materials having a thickness of 30 mm or more. As a result, gas shielded arc welding and submerged arc welding are used in combination, and the heat input of submerged arc welding is controlled to an appropriate range, so that the welding heat input is greatly reduced compared to the prior art, and the weld heat affected zone And found that excellent toughness can be obtained.
本発明は、上述の知見に基づくものであり、その要旨は以下の通りである。
１．板厚３０ｍｍ以上の鋼材を両面から溶接する厚鋼板の溶接方法であって、少なくとも一方の面の溶接は、多電極サブマージアーク溶接の第１電極の溶接方向前方にガスシールドアーク溶接の電極を配置して溶接を行い、前記多電極サブマージアーク溶接は、（１）式を満足する入熱、前記ガスシールドアーク溶接は（２）式を満足する入熱とすることを特徴とする厚鋼板の溶接方法。
The present invention is based on the above-mentioned knowledge, and the gist thereof is as follows.
1. A welding method for a thick steel plate in which a steel material having a thickness of 30 mm or more is welded from both sides, and at least one of the surfaces is welded with a gas shielded arc welding electrode in front of the first electrode in multi-electrode submerged arc welding. Welding of thick steel plates, wherein the multi-electrode submerged arc welding is heat input satisfying the equation (1), and the gas shielded arc welding is heat input satisfying the equation (2) Method.
０．１８ｔ−３≦ＱＳ≦０．３５ｔ−５．５・・・・（１）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＳ：多電極サブマージアーク溶接の溶
接入熱（ｋＪ／ｍｍ）
ＱＧ≦０．１７ｔ−１．５・・・・（２）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＧ：ガスシールドアーク溶接の溶接入
熱（ｋＪ／ｍｍ）
２．ガスシールドアーク溶接が多電極溶接で、第１電極に適用するワイヤ径が１．４ｍｍ以上で、電流密度が５００Ａ／ｍｍ２以上であることを特徴とする１に記載の厚鋼板の溶接方法。
３．１記載の厚鋼板の溶接方法において、鋼材を両面から溶接する場合、一方がバッキング側溶接、他方がファイナル側溶接で、前記バッキング側溶接は多電極サブマージアーク溶接のみで溶接し、前記多電極サブマージアーク溶接の第1電極のワイヤ径は３．２ｍｍ以下で、前記ファイナル側溶接は、多電極サブマージアーク溶接とガスシールドアーク溶接で溶接することを特徴とする厚鋼板の溶接方法。
0.18t-3 ≦ Q S ≦ 0.35t−5.5 (1)
Where t: steel plate thickness (mm), Q S : solution of multi-electrode submerged arc welding
Heat input (kJ / mm)
Q G ≦ 0.17t−1.5 (2)
Where t: steel plate thickness (mm), Q G : gas shielded arc welding input
Heat (kJ / mm)
2. 2. The thick steel plate welding method according to 1, wherein the gas shield arc welding is multi-electrode welding, the wire diameter applied to the first electrode is 1.4 mm or more, and the current density is 500 A / mm 2 or more.
In the thick steel plate welding method described in 3.1, when steel materials are welded from both sides, one is backing side welding, the other is final side welding, and the backing side welding is welded only by multi-electrode submerged arc welding. The wire diameter of the 1st electrode of electrode submerged arc welding is 3.2 mm or less, and the said final side welding is welding by multi-electrode submerged arc welding and gas shielded arc welding, The welding method of the thick steel plate characterized by the above-mentioned.
本発明は、鋼板を内外面から溶接するにあたり、ガスシールドアーク溶接とサブマージアーク溶接とを複合させて使用し、さらにガスシールドアーク溶接ならびにサブマージアーク溶接の入熱を適正な範囲に制御するようにしたので、内外面１層盛溶接で生産能率を損なうことなく、溶接入熱を板厚方向に効果的に分散し、溶接熱影響部で優れた靭性を得ることが可能で、産業上極めて有用である。 The present invention uses a combination of gas shielded arc welding and submerged arc welding to weld a steel plate from the inner and outer surfaces, and further controls the heat input of gas shielded arc welding and submerged arc welding to an appropriate range. Therefore, it is possible to effectively disperse the welding heat input in the plate thickness direction without impairing the production efficiency in the single-layer welding of the inner and outer surfaces, and to obtain excellent toughness in the weld heat affected zone, which is extremely useful industrially. It is.
本発明は、板厚３０ｍｍ以上の鋼材を対象とし、鋼材を両面から溶接する際、少なくとも一方の面の溶接は、ガスシールドアーク溶接と多電極サブマージアーク溶接とを組合わせたハイブリッド溶接とする。以下の説明で、内面溶接はバッキング側の溶接、外面溶接はファイナル側の溶接とする。 The present invention is directed to a steel material having a plate thickness of 30 mm or more, and when welding the steel material from both sides, the welding of at least one surface is a hybrid welding combining gas shield arc welding and multi-electrode submerged arc welding. In the following description, it is assumed that the inner surface welding is welding on the backing side and the outer surface welding is welding on the final side.
多電極サブマージアーク溶接では、会合部における溶け込み不足を回避しようとすると、入熱量が大きくなるので、溶け込みの深い溶接部が得られるガスシールドアーク溶接の電極を多電極サブマージアーク溶接の第１電極の溶接線方向前方に配置する。ガスシールドアーク溶接は単電極溶接でも多電極溶接でも良いが、多電極溶接の場合は、各電極が多電極サブマージアーク溶接の第１電極の溶接線方向前方に一列となるように配置する。 In multi-electrode submerged arc welding, if an attempt is made to avoid insufficient penetration at the meeting part, the amount of heat input increases. Therefore, an electrode of gas shield arc welding that can obtain a deeply welded part is used as the first electrode of multi-electrode submerged arc welding. It is arranged in front of the weld line. The gas shield arc welding may be single electrode welding or multi-electrode welding, but in the case of multi-electrode welding, each electrode is arranged in a line in front of the first electrode of the multi-electrode submerged arc welding in the welding line direction.
板厚３０ｍｍ以上の厚鋼板を溶接する場合、ハイブリッド溶接において多電極サブマージアーク溶接は、（１）式を満足する溶接入熱とする。 When welding thick steel plates having a plate thickness of 30 mm or more, multi-electrode submerged arc welding in hybrid welding is assumed to be welding heat input that satisfies the equation (1).
０．１８ｔ−３≦ＱＳ≦０．３５ｔ−５．５・・・・（１）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＳ：多電極サブマージアーク溶接の溶
接入熱（ｋＪ／ｍｍ）
多電極サブマージアーク溶接の溶接入熱ＱＳが０．３５ｔ−５．５を超える場合、溶接熱影響部において組織が粗大化し靭性が劣化する。一方、ＱＳが０．１８ｔ−３を下回る場合、アンダーカットが発生しやすい。
0.18t-3 ≦ Q S ≦ 0.35t−5.5 (1)
Where t: steel plate thickness (mm), Q S : solution of multi-electrode submerged arc welding
Heat input (kJ / mm)
If heat input Q S of the multi-electrode submerged arc welding is more than 0.35 T-5.5, it is degraded tissue coarsened toughness in the heat affected zone. On the other hand, if the Q S is less than the 0.18t-3, undercut it is likely to occur.
ガスシールドアーク溶接の溶接入熱ＱＧは、内面溶接と外面溶接との会合部における溶接熱影響部の靭性劣化を抑制するため小さくすることが有利で、（２）式を満足するように設定することが好ましい。 The welding heat input Q G of gas shielded arc welding is advantageous to reduce the toughness deterioration of the weld heat affected zone at the joint between the inner surface welding and the outer surface welding, and is set to satisfy the equation (2). It is preferable to do.
ＱＧ≦０．１７ｔ−１．５・・・・（２）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＧ：ガスシールドアーク溶接の溶接入
熱（ｋＪ／ｍｍ）
ガスシールドアーク溶接を多電極溶接とすると、単電極溶接の場合と比較して溶接速度を速くなり、製造能率を向上させて好ましい。
Q G ≦ 0.17t−1.5 (2)
Where t: steel plate thickness (mm), Q G : gas shielded arc welding input
Heat (kJ / mm)
If gas shielded arc welding is multi-electrode welding, the welding speed is increased compared with the case of single electrode welding, and the production efficiency is improved.
なお、（１）式、（２）式で規定する溶接入熱は、両溶接法が多電極溶接の場合は、それぞれの溶接法における各電極での溶接入熱の総和とする。 In addition, the welding heat input prescribed | regulated by (1) Formula and (2) Formula is the sum total of the welding heat input in each electrode in each welding method, when both welding methods are multi-electrode welding.
外面溶接を上記ハイブリッド溶接とし、内面溶接を多電極サブマージアーク溶接とし、その第１電極のワイヤ径を３．２ｍｍ以下とすることで、内面溶接の入熱を低減することができ、内面溶接の溶接熱影響部において優れた靭性が得られる。 The outer surface welding is the above hybrid welding, the inner surface welding is a multi-electrode submerged arc welding, and the wire diameter of the first electrode is 3.2 mm or less, so that the heat input of the inner surface welding can be reduced. Excellent toughness is obtained in the weld heat affected zone.
本発明の実施において、多電極サブマージアーク溶接の第１電極とガスシールドアーク溶接の電極間距離、ガスシールドアーク溶接のシールドガス組成、シールドガス流量、両溶接法の溶接ワイヤ径などは良好な溶接ビード外観が得られるように適宜設定する。 In the practice of the present invention, the distance between the first electrode of multi-electrode submerged arc welding and the electrode of gas shielded arc welding, the shielding gas composition of gas shielding arc welding, the shielding gas flow rate, the welding wire diameter of both welding methods, etc. are satisfactory. Set appropriately to obtain a bead appearance.
但し、入熱を板厚方向に分散させるためにはガスシールドアーク溶接において深い溶け込みを得ることが必要で、高電流・高電流密度溶接が必要となる。深い溶け込みを得るには電流値をワイヤの断面積で除した電流密度が５００Ａ／ｍｍ２以上である必要があり、実用的にはワイヤ径が１．４ｍｍ以上なければ高電流での溶接ができない。好適な範囲は１．４ｍｍから２．４ｍｍの範囲である。 However, in order to disperse the heat input in the plate thickness direction, it is necessary to obtain deep penetration in gas shielded arc welding, and high current / high current density welding is required. In order to obtain deep penetration, the current density obtained by dividing the current value by the cross-sectional area of the wire needs to be 500 A / mm 2 or more. In practice, if the wire diameter is not more than 1.4 mm, high current welding cannot be performed. . The preferred range is from 1.4 mm to 2.4 mm.
本発明をＵＯＥ鋼管に適用して鋼管のシーム部の開先を両面から溶接する場合、一方の面は鋼管内面側のバッキング側溶接、他方が鋼管外面側のファイナル側溶接となり、まず、バッキング側溶接を第1電極のワイヤ径を好ましくは３．２ｍｍ以下、より好ましくは１．２ｍｍ〜２．４ｍｍとする多電極サブマージアーク溶接のみで溶接し、その後、ファイナル側溶接を、多電極サブマージアーク溶接とガスシールドアーク溶接の上記ハイブリッド溶接で溶接する。 When the present invention is applied to a UOE steel pipe and the groove of the seam portion of the steel pipe is welded from both sides, one side is the welding on the inner side of the steel pipe and the other side is the final side welding on the outer side of the steel pipe. Welding is performed only by multi-electrode submerged arc welding in which the wire diameter of the first electrode is preferably 3.2 mm or less, more preferably 1.2 mm to 2.4 mm, and then final-side welding is performed by multi-electrode submerged arc welding. And the above hybrid welding of gas shielded arc welding.
表１に示す化学組成の板厚３０．２ｍｍ、３３．０ｍｍ、３８．１ｍｍの鋼板に、表２および図１に示す開先を加工し、表３に示す溶接条件で内面溶接（バッキング側の溶接）を実施した後、表４および表５に示す溶接条件で外面溶接（ファイナル側の溶接）を実施した。作製した継手について、ビード外観の調査を実施した。 A groove shown in Table 2 and FIG. 1 is processed into a steel plate having a thickness of 30.2 mm, 33.0 mm, and 38.1 mm having a chemical composition shown in Table 1, and inner surface welding (on the backing side) is performed under the welding conditions shown in Table 3. After performing welding), outer surface welding (final side welding) was performed under the welding conditions shown in Tables 4 and 5. About the produced coupling, the bead appearance was investigated.
さらに、溶接熱影響部から採取した試料を用いてＪＩＳ Ｚ ２２４２の金属材料衝撃試験方法に準拠してシャルピー衝撃試験を行い、溶接熱影響部の靭性を評価した。シャルピー衝撃試験片（ＪＩＳ Ｚ ３１１１に規定する４号試験片）の採取は、試験片のノッチの方向と板厚方向が平行となるように採取し、図２（ａ）に示すように、外面Ｆｕｓｉｏｎ Ｌｉｎｅ（以下、ＦＬと表記）シャルピー試験片は外面溶接側の鋼板表面下７ｍｍの位置がシャルピー試験片中央となるよう採取し、図２（ｂ）に示すようにルート部ＦＬ シャルピー試験片は内面溶接と外面溶接の会合部がシャルピー試験片中央となるよう採取した。図２（ｃ）はルート部ＦＬシャルピー試験片のノッチ位置詳細を示す。
シャルピー試験は−３０℃で３本実施し、シャルピー吸収エネルギーの平均値を求めた。なお、シャルピー試験片のノッチ底における溶接金属と母材（溶接熱影響部）の比率が５０％−５０％になるように試験片を加工した。
Further, a Charpy impact test was performed in accordance with the metal material impact test method of JIS Z 2242 using samples collected from the weld heat affected zone, and the toughness of the weld heat affected zone was evaluated. The Charpy impact test piece (No. 4 test piece specified in JIS Z 3111) was collected so that the notch direction and the plate thickness direction of the test piece were parallel to each other, and as shown in FIG. Fusion Line (hereinafter referred to as FL) Charpy test piece was taken so that the position 7mm below the surface of the steel plate on the outer surface welding side would be the center of the Charpy test piece, as shown in Fig. 2 (b), the root part FL Charpy test piece was The gathering part of the inner surface welding and the outer surface welding was sampled so as to be in the center of the Charpy specimen. FIG. 2C shows details of the notch position of the root part FL Charpy specimen.
Three Charpy tests were performed at −30 ° C., and the average value of Charpy absorbed energy was determined. In addition, the test piece was processed so that the ratio of the weld metal and the base material (welding heat affected zone) at the notch bottom of the Charpy test piece was 50% to 50%.
結果を表６に示す。記号１〜１０は（１）式および（２）式を満たす本発明例であり、ルート部ＦＬシャルピー試験および外面ＦＬシャルピー試験において高い吸収エネルギーが得られた。 The results are shown in Table 6. Symbols 1 to 10 are examples of the present invention that satisfy the expressions (1) and (2), and high absorbed energy was obtained in the root part FL Charpy test and the outer surface FL Charpy test.
記号１〜５についてはガスシールドアーク溶接が２電極以上の多電極溶接であり、第１電極に適用するワイヤ径が１．４ｍｍ以上で、電流密度が５００Ａ／ｍｍ２以上であり、表６に示すように外面溶接速度ＶＯＷを内面溶接速度ＶＩＷに対して大きく低下させずに板厚の６０％以上の深い溶込みが得られた。 For symbols 1 to 5, gas shield arc welding is multi-electrode welding of two or more electrodes, the wire diameter applied to the first electrode is 1.4 mm or more, and the current density is 500 A / mm 2 or more. As shown, a deep penetration of 60% or more of the plate thickness was obtained without significantly reducing the outer surface welding speed V OW with respect to the inner surface welding speed VIW .
一方、記号６〜８はガスシールドアーク溶接を１電極としており、外面溶接速度を内面溶接速度より３０％以上低下させて深い溶込みを得た実施例である。また、記号９はガスシールドアーク溶接の第１電極のワイヤ径が１．２ｍｍのため高電流での溶接ができず、記号１〜５に比べ溶込みが小さい実施例である。
On the other hand,
記号１０はガスシールドアーク溶接の第１電極の電流密度が５００Ａ／ｍｍ２未満であり、記号１〜５に比べ溶込みが小さい実施例である。 Symbol 10 is an example in which the current density of the first electrode of gas shielded arc welding is less than 500 A / mm 2 and the penetration is smaller than those of symbols 1 to 5.
記号１１〜１３は（２）式を満たさず、ガスシールドアーク溶接の入熱が過大でルート部ＦＬシャルピー試験において高い吸収エネルギーを得られなかった比較例である。また、記号１４、１５、１７は外面サブマージアーク溶接の入熱が過小で（１）式を満たさず、アンダーカットが生じた。 Symbols 11 to 13 are comparative examples in which the formula (2) is not satisfied, the heat input of gas shield arc welding is excessive, and high absorbed energy cannot be obtained in the root part FL Charpy test. Further, symbols 14, 15, and 17 indicate that the heat input of the outer surface submerged arc welding is too small to satisfy the expression (1), and an undercut occurs.
さらに記号１６、１８は外面サブマージアーク溶接の入熱が過大で（１）式を満たさず、外面ＦＬシャルピー試験において高い吸収エネルギーを得られなかった。 Further, symbols 16 and 18 did not satisfy the formula (1) because the heat input of the outer surface submerged arc welding was excessive, and high absorbed energy could not be obtained in the outer surface FL Charpy test.
記号１９〜２１は（１）式および（２）式を満たし、さらに内面溶接を多電極サブマージアーク溶接としてその第１電極のワイヤ径を３．２ｍｍ以下とした本発明例であり、ルート部ＦＬシャルピー試験、外面ＦＬシャルピー試験および内面ＦＬシャルピー試験において高い吸収エネルギーが得られた。 記号１９〜２１は内面サブマージアーク溶接の第１電極にワイヤ径３．２ｍｍ以下のワイヤを用いたので内面溶接速度が速くなっている。 Symbols 19 to 21 are examples of the present invention that satisfy the formulas (1) and (2), and the inner diameter welding is multi-electrode submerged arc welding, and the wire diameter of the first electrode is 3.2 mm or less. High absorbed energy was obtained in the Charpy test, the outer surface FL Charpy test and the inner surface FL Charpy test. Symbols 19 to 21 use a wire having a wire diameter of 3.2 mm or less for the first electrode of the inner surface submerged arc welding, so that the inner surface welding speed is increased.
１ 鋼板母材
２ 外面Ｆｕｓｉｏｎ Ｌｉｎｅシャルピー試験片
３ シャルピー試験片ノッチ
４ 溶接金属
５ Ｆｕｓｉｏｎ Ｌｉｎｅ
６ ルート部Ｆｕｓｉｏｎ Ｌｉｎｅシャルピー試験片
DESCRIPTION OF SYMBOLS 1 Steel plate base material 2 Outer surface Fusion Line Charpy test piece 3 Charpy test piece notch 4
6 root part Fusion Line Charpy specimen
Claims (2)
前記ガスシールドアーク溶接は、多電極溶接で、第１電極に適用するワイヤ径が１．４ｍｍ〜２．４ｍｍで、電流密度が５００Ａ／ｍｍ２以上であることを特徴とする厚鋼板の溶接方法。
１８ｔ−３≦ＱＳ≦０．３５ｔ−５．５・・・・（１）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＳ：多電極サブマージアーク溶接の溶接入熱（ｋＪ／ｍｍ）
ＱＧ≦０．１７ｔ−１．５・・・・（２）
ここで、ｔ：鋼材の板厚（ｍｍ）、ＱＧ：ガスシールドアーク溶接の溶接入熱（ｋＪ／ｍｍ） A welding method for a thick steel plate in which a steel material having a thickness of 30 mm or more is welded from both sides, and at least one of the surfaces is welded with a gas shielded arc welding electrode in front of the first electrode in multi-electrode submerged arc welding. The multi-electrode submerged arc welding is heat input satisfying the equation (1), the gas shielded arc welding is heat input satisfying the equation (2) ,
The gas shielded arc welding is multi-electrode welding, the wire diameter applied to the first electrode is 1.4 mm to 2.4 mm, and the current density is 500 A / mm 2 or more. .
18t-3 ≦ Q S ≦ 0.35t−5.5 (1)
Here, t: steel plate thickness (mm), Q S : welding heat input of multi-electrode submerged arc welding (kJ / mm)
Q G ≦ 0.17t−1.5 (2)
Where t: steel plate thickness (mm), Q G : welding heat input of gas shield arc welding (kJ / mm)
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