JPH09122957A - Filler material for laser beam welding of martensitic stainless steel - Google Patents
Filler material for laser beam welding of martensitic stainless steelInfo
- Publication number
- JPH09122957A JPH09122957A JP7283497A JP28349795A JPH09122957A JP H09122957 A JPH09122957 A JP H09122957A JP 7283497 A JP7283497 A JP 7283497A JP 28349795 A JP28349795 A JP 28349795A JP H09122957 A JPH09122957 A JP H09122957A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- filler material
- weld metal
- stainless steel
- ferrite
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Landscapes
- Laser Beam Processing (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はレーザ溶接を適用
してマルテンサイト系ステンレス鋼の突き合わせ接合を
行うにあたって健全な溶接継手を得ることができる溶接
方法およびフィラー材料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method and a filler material capable of obtaining a sound welded joint when butt-joining martensitic stainless steel by applying laser welding.
【０００２】[0002]
【従来の技術】鋼板の製造プロセスにおける例えば圧延
ラインなどでは、素材歩留りおよび生産性の向上を図る
ために、複数の鋼帯をつなぎ合わせて連続的な処理を行
うようにしているのが一般的である。2. Description of the Related Art In a steel sheet manufacturing process, for example, a rolling line or the like, it is common to connect a plurality of steel strips for continuous treatment in order to improve material yield and productivity. Is.
【０００３】そして、このようなラインにおいて、鋼帯
を接合するには、短時間で接合可能なフラッシュ溶接、
シーム溶接、レーザ溶接などが適用されていて、なかで
も、レーザ溶接は、高エネルギー密度の熱源を用いるこ
と、溶接および熱影響部の幅が狭いことから高品質な溶
接が可能であり、しかも普通鋼をはじめ、高合金鋼、ス
テンレス鋼などの各種の鋼材に適用できるため、連続処
理ラインの鋼帯接合用として優れた特性を有するもので
あった。In such a line, in order to join steel strips, flash welding, which enables joining in a short time,
Seam welding, laser welding, etc. are applied. Among them, laser welding uses a high energy density heat source, and because the width of the welding and heat-affected zone is narrow, high-quality welding is possible. Since it can be applied to various steel materials such as steel, high alloy steel and stainless steel, it has excellent properties for joining steel strips in a continuous processing line.
【０００４】レーザによる突き合わせ溶接では、溶接金
属の組成制御あるいは突き合わせギャップに対する裕度
確保を目的として、ガスシールドアーク溶接と同様にフ
ィラーワイヤ等のフィラー材料を用いる場合があり、先
の連続ラインにおけるレーザ溶接においても、安定した
溶接を実施する観点から、フィラー材料を使用するのが
一般的であった。In laser butt welding, a filler material such as a filler wire may be used in the same manner as in gas shielded arc welding for the purpose of controlling the composition of the weld metal or ensuring a margin with respect to the butt gap. Also in welding, it was common to use a filler material from the viewpoint of performing stable welding.
【０００５】ここに、フィラー材料は、接合予定部に形
成されるギャップを埋め、欠陥のない健全な継手を形成
する役目を果たすことの他、特に合金成分量が高く割れ
感受性の高い鋼材においては、母材とフィラーを混合す
ることにより、溶接金属組成を調整し、割れ防止および
溶接金属部の冶金的、機械的性質を制御する機能を有す
るものである。Here, the filler material fills the gap formed in the joint to be joined and forms a sound joint having no defects. In addition, particularly in steel materials having a high alloy content and a high crack susceptibility. By mixing the base material and the filler, it has the functions of adjusting the weld metal composition, preventing cracks, and controlling the metallurgical and mechanical properties of the weld metal portion.
【０００６】とりわけレーザ溶接は、ガスシールドアー
ク溶接などに比べて低入熱で冷却速度が遅いため、鋼材
の種類によっては凝固割れが発生し易く、また、溶接部
を著しく硬化させるので溶接金属部の冶金的、機械的性
質の制御の必要性は非常に高い。Laser welding, in particular, has a lower heat input and a slower cooling rate than gas shielded arc welding, so solidification cracking is likely to occur depending on the type of steel material, and the welded portion is significantly hardened, so that the welded metal portion The need for controlling the metallurgical and mechanical properties of is very high.
【０００７】この点に関する先行文献として、例えば特
開平６−６７０号公報には、溶接金属中のNiが７重量％
を超える量になるようフィラー材料を供給しながらレー
ザ溶接を行うフェライト系ステンレス鋼の溶接方法が開
示されていて、これによれば溶接金属中にオーステナイ
ト相を析出させることができ、結晶粒の粗大化が防止さ
れ、靱性に優れた溶接部を得ることができるとされてい
た。As a prior document relating to this point, for example, in Japanese Patent Laid-Open No. 6-670, Ni in the weld metal is 7% by weight.
Disclosed is a welding method for ferritic stainless steel in which laser welding is performed while supplying a filler material so that the amount exceeds the limit. According to this method, an austenite phase can be precipitated in the weld metal, and coarse crystal grains are formed. It has been said that a welded portion having a high toughness can be obtained by preventing the formation of the welded metal.
【０００８】ところで、マルテンサイト系ステンレス鋼
のレーザ溶接においては、溶接時の凝固割れや、マルテ
ンサイト変態による硬化に起因した割れが生じやすく、
健全な継手を作製し難い不具合があった。さらに、前述
のようにNiを多量に添加することにより、オーステナイ
ト主体の組織として硬化を防げたとしても、オーステナ
イト相は割れ感受性が高く炭素その他の添加元素の影響
によりレーザ溶接においては一般にミクロ割れと呼ばれ
る凝固割れが生じやすくなる。By the way, in laser welding of martensitic stainless steel, solidification cracking during welding and cracking due to hardening due to martensitic transformation are apt to occur,
There was a problem that it was difficult to make a sound joint. Further, as described above, by adding a large amount of Ni, even if it is possible to prevent hardening as a structure of austenite mainly, the austenite phase has a high cracking susceptibility and is generally microcracked in laser welding due to the effect of carbon and other additive elements So-called solidification cracking tends to occur.
【０００９】また、この種のステンレス鋼においては、
溶接直後における割れが防止できても、連続処理ライン
において溶接継手部に曲げあるいは圧下力が加わったり
すると著しく硬化した溶接金属から割れを生じることに
なり、これは、鋼材中のＣ，Mn, Mo, Nbなどの合金元素
量が増加した場合により一層顕著であり、さらに、フィ
ラー材料を使用して溶接金属の組成を調整するにしても
レーザ溶接ではビード幅が細くなるため、接合予定部の
突き合わせギャップ量を小さくしなければならない、あ
るいは入熱量が少ないためフィラー溶融量が限られるな
ど継手の開先形状の自由度が少なく、（母材溶融量／溶
接金属量）で定義される希釈率は、通常の場合、60〜90
％とガスシールドアーク溶接の場合に比べ高くなる。す
なわち溶接金属部においてもフィラー材添加の効果が働
きにくくマルテンサイト組成となり易い。Further, in this type of stainless steel,
Even if cracks can be prevented immediately after welding, cracking will occur from the significantly hardened weld metal when bending or rolling force is applied to the weld joint in the continuous processing line. This is because C, Mn, Mo in steel materials It is more remarkable when the amount of alloying elements such as Nb and Nb increases, and even if the composition of the weld metal is adjusted by using a filler material, the bead width becomes smaller in laser welding. The degree of freedom of the joint groove shape is small, such as the gap amount must be reduced, or the amount of heat input is small, which limits the amount of filler melt, and the dilution rate defined by (base metal melt amount / weld metal amount) is , Usually 60-90
%, Which is higher than that of gas shielded arc welding. That is, even in the weld metal part, the effect of adding the filler material is hard to work, and the composition tends to be martensite.
【００１０】また、ビード幅が狭く、高速のレーザ溶接
では、溶接金属の混合が促進されにくく、特に母材の裏
面近傍ではフィラー成分が十分に混合されず、実質的に
より高い希釈率の組成となりやすい。そのため、フィラ
ー成分の影響がガスシールドアーク溶接に比べ効果的に
働かず、現在一般に市販、使用されているアーク溶接用
の溶接ワイヤでは、溶接金属の組成制御が不十分で凝固
割れおよび硬化に起因する割れを完全に防止することが
できない。Also, in high-speed laser welding with a narrow bead width, mixing of the weld metal is difficult to promote, and particularly in the vicinity of the back surface of the base metal, the filler component is not sufficiently mixed, and the composition has a substantially higher dilution rate. Cheap. Therefore, the effect of the filler component does not work as effectively as in gas shielded arc welding, and the welding wire for arc welding that is currently generally commercially available and used has insufficient composition control of the weld metal and is caused by solidification cracking and hardening. It is impossible to completely prevent cracking.
【００１１】[0011]
【発明が解決しようとする課題】この発明の目的は、マ
ルテンサイト系ステンレス鋼のレーザ溶接において不可
避な溶接金属の凝固割れ、溶接金属の硬化に起因する割
れを防止することができる溶接方法およびその方法に適
合するフィラー材料を提案するところにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a welding method capable of preventing solidification cracking of weld metal and cracks caused by hardening of the weld metal, which are unavoidable in laser welding of martensitic stainless steel. We are proposing a filler material that is compatible with the method.
【００１２】[0012]
【課題を解決するための手段】この発明は、マルテンサ
イト系ステンレス鋼をレーザ溶接にて突き合わせ接合す
るに当たり、溶接金属の金属組織がフェライト相を５％
以上含むフェライト＋オーステナイト混相組織となるよ
うに、接合予定部にフィラー材料を充てんしつつ溶接す
ることを特徴とするマルテンサイト系ステンレス鋼のレ
ーザ溶接方法であり、フィラー材料としては、Ｃ：0.10
wt ％ (以下wt％を単に％で示す) 、Cr eq：35〜60％、
Nieq：30％以下を含み、残部が不可避的不純物およびFe
からなり、このうちCreqとNieqについては下記の(1)
式、(2) 式を同時に満足するものとする。The present invention is a martenser.
Butt type stainless steels are butt-joined by laser welding
The weld metal has a ferrite phase of 5%.
It becomes a ferrite + austenite mixed phase structure containing the above.
And fill it with filler material at the planned joint.
Of martensitic stainless steel characterized by
Laser welding method, the filler material is C: 0.10.
wt% (hereinafter wt% is simply expressed as%), Cr eq: 35-60%,
Nieq: Containing 30% or less, balance unavoidable impurities and Fe
Consisting of, of which CreqAnd NieqFor (1) below
Equation (2) should be satisfied at the same time.
【００１３】 20Creq（％）＋13 Ni eq（％）≧1000 ----(1) 2Creq（％）＞3 Nieq（％) ----(2) ただし、 Creq＝ Cr （％) ＋Mo（％) ＋1.5 Si（％)
＋0.5 Nb（％) Nieq＝Ni（％) ＋30 C (％) ＋0.5 Mn（％)20Cr eq (%) + 13 Ni eq (%) ≧ 1000 ---- (1) 2Cr eq (%)> 3 Ni eq (%) ---- (2) where Cr eq = Cr (% ) + Mo (%) +1.5 Si (%)
＋0.5 Nb (%) Ni eq ＝ Ni (%) ＋30 C (%) ＋0.5 Mn (%)
【００１４】この発明に適合するフィラー材料を使用す
ることにより、アーク溶接に比べ母材希釈率が高く、急
冷プロセスのレーザ溶接においても、溶接時および溶接
後の曲げ、圧延時に割れを生じない溶接金属を得ること
が可能になる。By using a filler material that conforms to the present invention, the base metal dilution rate is higher than that in arc welding, and even in laser welding in a quenching process, welding that does not cause cracks during welding, bending after welding, and rolling during welding. It becomes possible to obtain metal.
【００１５】フィラー材料は母材と溶融混合して溶接金
属を形成するものであり、使用形態としてはワイヤ状の
ものや粉末状のもの、あるいは箔状のものなどを使用す
ることができ、その形状についてとくに限定はされな
い。The filler material is for melting and mixing with the base material to form a weld metal, and the form of use may be a wire form, a powder form, or a foil form. The shape is not particularly limited.
【００１６】[0016]
【発明の実施の形態】この発明では、溶接金属の金属組
織をフェライト相を５％以上含むフェライト＋オーステ
ナイト混相組織としたが、その理由は、レーザ溶接にお
いては、溶接部がマルテンサイト組成を含むと著しく硬
化し低温での割れを生じやすく、オーステナイト主体の
組成となると凝固割れを生じやすくなるからであり、こ
れを防ぐためには溶接金属の金属組織を５％以上のフェ
ライト相を含むフェライト＋オーステナイト混相組織と
するのが有利だからである。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the metal structure of the weld metal is a ferrite + austenite mixed phase structure containing 5% or more of ferrite phase. The reason is that in laser welding, the weld contains martensite composition. This is because when the composition is mainly composed of austenite, solidification cracking is likely to occur, and in order to prevent this, the metal structure of the weld metal is ferrite + austenite containing 5% or more of ferrite phase. This is because it is advantageous to use a multiphase structure.
【００１７】すなわち、マルテンサイト系ステンレス鋼
の金属組織において５％以上のフェライトを含ませるこ
とによりＳ、Ｐなどの不純物元素をフェライト中に固溶
させ、最終凝固部におけるＳ、Ｐなどの混化を避け、割
れ感受性を低くすることができるからである（Ｓ、Ｐな
どが割れを促進する元素であること、フェライトはオー
ステナイトよりＳ、Ｐなどの固溶度が高いことは一般的
に知られている）。That is, by containing 5% or more of ferrite in the metallographic structure of martensitic stainless steel, impurity elements such as S and P are solid-solved in the ferrite, and S and P are mixed in the final solidified portion. This is because it is generally known that crack susceptibility can be reduced (S and P are elements that promote cracking, and ferrite has a higher solid solubility of S and P than austenite. ing).
【００１８】この発明に従えば、割れ感受性が高く、溶
接部の硬化が著しいマルテンサイト系ステンレス鋼のレ
ーザ溶接において、溶接時の凝固割れおよび硬化に起因
する溶接金属の割れは回避され、鋼板製造過程の連続ラ
インにおいて継手部に繰り返しの曲げや圧延などの負荷
が加わっても割れが生じるようなことはない。According to the present invention, in laser welding of martensitic stainless steel having high cracking susceptibility and marked hardening of the welded portion, solidification cracking during welding and cracking of the weld metal due to hardening are avoided, and steel sheet production Even if a load such as repeated bending or rolling is applied to the joint in the continuous line of the process, cracking does not occur.
【００１９】フィラー材料の化学組成の限定理由は以下
のとおりである。 Ｃ：0.10以下 Ｃは鋼中の固溶元素として静的強度を高めるが、硬度お
よび割れ感受性を増大させる元素である。また、Ｃはオ
ーステナイト生成を促進させる強い働きがあるが、レー
ザ溶接のような急冷プロセスでは、オーステナイト主体
の組織となった場合、一般にミクロ割れといわれる凝固
割れが起こりやすくなる。溶接金属の凝固割れおよび硬
化に起因する割れを防止するためには、溶接金属中のＣ
量をある程度以下に抑える必要があり、このためこの発
明においては、材料中におけるＣの含有量を0.10％以下
に制限した。The reasons for limiting the chemical composition of the filler material are as follows. C: 0.10 or less C is an element that enhances static strength as a solid solution element in steel, but increases hardness and crack susceptibility. Further, C has a strong function of promoting the generation of austenite, but in a quenching process such as laser welding, solidification cracking generally called microcracking tends to occur when a structure mainly composed of austenite is formed. In order to prevent solidification cracking of the weld metal and cracking due to hardening, C in the weld metal is prevented.
It is necessary to control the amount to a certain level or less. Therefore, in the present invention, the content of C in the material is limited to 0.10% or less.
【００２０】Creq：35〜60％、Ni：30％ Crはフェライトの生成を、また、Niはオーステナイトの
生成を促進させる元素であり、これらの元素をフィラー
材料から溶接金属中に添加することによりマルテンサイ
トの生成を防止できる。Cr eq : 35-60%, Ni: 30% Cr is an element that promotes the formation of ferrite and Ni is an austenite, and these elements should be added to the weld metal from the filler material. This can prevent the formation of martensite.
【００２１】Cr，Ni量と溶接金属組織の関係は、シェフ
ラーの組織図などによって示されているが、母材希釈率
が高く、凝固・冷却速度が速いレーザ溶接においては、
従来のアーク溶接用ワイヤ等よりも多くのCrおよびNiを
添加することによって溶接金属中のマルテンサイト生成
を抑制し、硬化に起因する割れを防止できると考えら
れ、また、CrあるいはNiと同様の作用を有するMn, Mo,
Si, Nbなどの影響をCr当量、Ni当量として考慮しその適
正添加量を種々の試験により検討した結果によれば、 Creq≧35％，20［Creq％］＋13［Nieq％］≧1000 を満たすCreqおよびNieqをフィラー材料中に含有させる
ことにより、一般的なレーザ溶接条件において、溶接時
および溶接後の曲げ、圧延などの加工時の割れを防止で
きる。The relationship between the amounts of Cr and Ni and the weld metal structure is shown by the Schaeffler structure diagram, etc., but in laser welding where the base metal dilution rate is high and the solidification / cooling rate is high,
It is thought that by suppressing the generation of martensite in the weld metal by adding more Cr and Ni than the conventional arc welding wire, it is possible to prevent cracks due to hardening, and similar to Cr or Ni. Mn, Mo, with action
The effects of Si, Nb, etc. are considered as Cr equivalent and Ni equivalent, and the appropriate addition amount is examined by various tests. According to the results, Cr eq ≧ 35%, 20 [Cr eq %] + 13 [Ni eq %] ≧ By including Cr eq and Ni eq satisfying 1000 in the filler material, cracks can be prevented under general laser welding conditions during welding and during bending, rolling, and other processing during processing.
【００２２】Nieqの上限を30％とし、２Creq＞３Nieqと
規定したのは、Nieqを大きくすると溶接金属中のオース
テナイトの割合が増加し、レーザ溶接の急速凝固過程で
ミクロ割れといわれる凝固割れを生じるのでこれを回避
するために上記の如く規定したものである。The upper limit of Ni eq was set to 30%, and 2Cr eq > 3Ni eq was defined. The larger Ni eq increases the proportion of austenite in the weld metal, which is called microcracking in the rapid solidification process of laser welding. Since solidification cracking occurs, it is defined as described above in order to avoid it.
【００２３】Creqの上限を60％としたのは、Creqのフェ
ライト生成による割れ防止の効果は、60％を超える添加
で飽和する傾向にあること、また、フィラー材料として
ワイヤを使用する場合に、60％を超えるものでは伸線加
工が困難になるなど、ワイヤの製造技術およびコスト面
からの理由による。The upper limit of Cr eq is set to 60% because the effect of preventing cracking due to ferrite formation of Cr eq tends to saturate with addition of more than 60%, and when a wire is used as a filler material. In addition, it is difficult to draw wire with more than 60%, because of the wire manufacturing technology and cost.
【００２４】[0024]
【実施例】 実施例 表１に示す組成になる板厚4.5 mmのマルテンサイト系ス
テンレス鋼板を２種類用意して下記の条件下にそれぞれ
レーザ溶接を行い、その時点での溶接金属の割れの有無
(割れ無しを○で、割れ有りを×で表示) を確認すると
ともに、かかる溶接済の鋼板をさらに冷間圧延 (圧下率
25％) して溶接金属における割れ発生の有無 (溶接ビー
ドの外観観察と数カ所の断面観察) と割れに起因した板
の破断が発生するかどうかについて調査した。その結果
を溶接に際して使用したフィラーの組成とともに表２・
表３に示す。なお適合例５は箔をインサートし、適合例
１４は粉末を供給した他はフィラーとしてワイヤを用い
た。Example Two types of martensitic stainless steel sheets having a thickness of 4.5 mm and having the composition shown in Table 1 were prepared and laser welded under the following conditions, respectively, and the presence or absence of cracks in the weld metal at that time.
(No cracks are indicated by ○, cracks are indicated by ×), and the welded steel sheet is further cold-rolled (reduction ratio).
Then, the presence or absence of cracking in the weld metal (observation of appearance of weld bead and observation of cross-sections at several places) and whether or not the plate breaks due to the cracking were investigated. The results are shown in Table 2 along with the composition of the filler used for welding.
It is shown in Table 3. In the conforming example 5, a foil was inserted, and in the conforming example 14, a wire was used as a filler except that powder was supplied.
【００２５】[0025]
【表１】 [Table 1]
【００２６】レーザ溶接条件 突き合わせギャップ量：0.2 mm 照射レーザ出力：7.2 kW (炭酸ガスレーザ, 波長10. 6
μm ) レーザビーム焦点位置：鋼板表面から1.5 mm内側 溶接速度： ３ m/min フィラーの供給速度：４ m/minLaser welding conditions Butt gap amount: 0.2 mm Irradiation laser output: 7.2 kW (carbon dioxide laser, wavelength 10.6
μm) Laser beam focus position: 1.5 mm inside from steel plate surface Welding speed: 3 m / min Filler supply speed: 4 m / min
【００２７】[0027]
【表２】 [Table 2]
【００２８】[0028]
【表３】 [Table 3]
【００２９】この発明に従い溶接を行った適合例のNo.1
〜14では、いずれも溶接金属の組織は５％以上のフェラ
イトを含むフェライト＋オーステナイト混相であり割れ
の発生はなく圧延にも耐える健全な溶接金属であること
が確かめられた。No. 1 of the conforming example in which welding was performed according to the present invention
It was confirmed that in all of Nos. 14 to 14, the structure of the weld metal is a ferrite + austenite mixed phase containing 5% or more of ferrite, cracks do not occur, and the weld metal is sound enough to withstand rolling.
【００３０】これに対して比較例のNo.1〜7,16,17 で
は、Creq量および (20Creq＋13Nieq)量がこの発明で規
定した量よりも不足し溶接金属がマルテンサイトを含む
ために硬化の抑制が不十分となり、これに起因した割れ
が避けられず、とくにこのような硬化に起因した割れ
は、フィラー成分の混合が十分に行われず溶接ビード下
部のデンドライト組織会合部において起こりやすいこと
が確認できた。On the other hand, in Comparative Examples Nos. 1 to 7, 16 and 17, the Cr eq amount and the (20Cr eq + 13Ni eq ) amount were less than the amount specified in the present invention, and the weld metal contained martensite. Due to this, the suppression of hardening becomes insufficient, and cracks due to this are unavoidable.In particular, cracks due to such hardening occur in the dendrite microstructure association area under the weld bead due to insufficient mixing of filler components. It was confirmed to be easy.
【００３１】また、比較例のNo.8〜15においては、Nieq
の量が30％を超えているか、あるいは 2Creq＜ 3Nieqの
要件を満足していないため溶接金属中のオーステナイト
組織の割合が増加し、凝固割れ感受性が高くなった結果
としてミクロ割れが生じた。そして、この割れは、上記
の硬化に起因する割れと異なり溶接金属中のデンドライ
ト組織間でデンドライトに沿った形で起こっていた。溶
接金属中にミクロ割れがあっても比較例11,12 について
は圧延時に破断は起こらなかったが、圧下率の高い圧延
や曲げ変形が繰り返されるような場合には、破断に至る
可能性が高く、健全な溶接金属とはいい難かった。In Comparative Examples Nos. 8 to 15, Ni eq
Content exceeds 30% or does not meet the requirement of 2Cr eq <3Ni eq , the proportion of austenite structure in the weld metal increases and microcracking occurs as a result of increased solidification cracking susceptibility. . And, unlike the cracks caused by the above-mentioned hardening, the cracks occurred between the dendrite structures in the weld metal along the dendrites. Even if there were micro cracks in the weld metal, no fracture occurred in Comparative Examples 11 and 12 during rolling, but there is a high possibility of fracture when rolling with a high reduction rate or repeated bending deformation. It was hard to say that it was a sound weld metal.
【００３２】比較例のNo. 18〜20では、Ｃ量が0.1 ％を
超えているため溶接金属の硬化が著しく、溶接直後に割
れが生じた。In Comparative Examples Nos. 18 to 20, the C content was more than 0.1%, so that the weld metal was significantly hardened and cracking occurred immediately after welding.
【００３３】[0033]
【発明の効果】この発明によればアーク溶接に比較して
母材希釈率が高い急冷プロセスのレーザ溶接を行っても
割れの有しない健全な溶接金属を得ることができる。According to the present invention, it is possible to obtain a sound weld metal having no cracks even when performing laser welding in a quenching process having a higher base metal dilution rate than arc welding.
Claims (1)
溶接用フィラー材料において、 該フィラー材料は、Ｃ：0.10wt％以下、Creq：35〜60wt
％、Nieq：30wt％以下を含み、残部が不可避的不純物お
よびFeからなり、このうちCreqおよびNieqについては下
記(1) 式および(2) 式を同時に満足するものである、こ
とを特徴とするマルテンサイト系ステンレス鋼のレーザ
溶接用フィラー材料。 記 20 Cr eq（wt％）＋ 13 Ni eq （wt％）≧1000 ----- (1) 2 Cr eq（wt％）＞3 Ni eq （wt％) ----- (2) ただし、Cr eq ＝ Cr （wt％) ＋Mo（wt％) ＋1.5 Si
（wt％) ＋0.5 Nb（wt％) Ni eq＝Ni（wt％) ＋30 C (wt％) ＋0.5 Mn（wt％)1. A filler material for laser welding of martensitic stainless steel, wherein the filler material is C: 0.10 wt% or less, Cr eq : 35-60 wt.
%, Ni eq : 30 wt% or less, and the balance consists of inevitable impurities and Fe. Of these, Cr eq and Ni eq satisfy the following equations (1) and (2) at the same time. A characteristic filler material for laser welding of martensitic stainless steel. Note 20 Cr eq (wt%) + 13 Ni eq (wt%) ≧ 1000 ----- (1) 2 Cr eq (wt%)> 3 Ni eq (wt%) ----- (2) , Cr eq = Cr (wt%) + Mo (wt%) + 1.5 Si
(Wt%) ＋0.5 Nb (wt%) Ni eq ＝ Ni (wt%) ＋30 C (wt%) ＋0.5 Mn (wt%)
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| JP28349795A JP3740725B2 (en) | 1995-10-31 | 1995-10-31 | Filler material for laser welding of martensitic stainless steel |
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| JP3740725B2 JP3740725B2 (en) | 2006-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28349795A Expired - Fee Related JP3740725B2 (en) | 1995-10-31 | 1995-10-31 | Filler material for laser welding of martensitic stainless steel |
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Cited By (4)
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|---|---|---|---|---|
| JP2002248587A (en) * | 2001-02-26 | 2002-09-03 | Hitachi Metals Ltd | Welding method of martensitic stainless steel thin strip |
| CN104759788A (en) * | 2015-03-09 | 2015-07-08 | 西安理工大学 | OCr13Ni5Mo steel metal flux-cored wire and preparation method thereof |
| WO2016052445A1 (en) * | 2014-09-29 | 2016-04-07 | 株式会社日立製作所 | Two-phase alloy, product obtained using said two-phase alloy, and process for producing said product |
| CN114833488A (en) * | 2022-04-15 | 2022-08-02 | 大连海事大学 | Filling powder for laser welding of EH36 steel and preparation method and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2016052445A1 (en) * | 2014-09-29 | 2016-04-07 | 株式会社日立製作所 | Two-phase alloy, product obtained using said two-phase alloy, and process for producing said product |
| JPWO2016052445A1 (en) * | 2014-09-29 | 2017-04-27 | 株式会社日立製作所 | Two-phase alloy, product using the two-phase alloy, and method for producing the product |
| US10718038B2 (en) | 2014-09-29 | 2020-07-21 | Hitachi, Ltd. | Two-phase alloy, product using said two-phase alloy, and method for producing said product |
| CN104759788A (en) * | 2015-03-09 | 2015-07-08 | 西安理工大学 | OCr13Ni5Mo steel metal flux-cored wire and preparation method thereof |
| CN114833488A (en) * | 2022-04-15 | 2022-08-02 | 大连海事大学 | Filling powder for laser welding of EH36 steel and preparation method and use method thereof |
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|---|---|
| JP3740725B2 (en) | 2006-02-01 |
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