JPS6324799B2 - - Google Patents
Info
- Publication number
- JPS6324799B2 JPS6324799B2 JP54016065A JP1606579A JPS6324799B2 JP S6324799 B2 JPS6324799 B2 JP S6324799B2 JP 54016065 A JP54016065 A JP 54016065A JP 1606579 A JP1606579 A JP 1606579A JP S6324799 B2 JPS6324799 B2 JP S6324799B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- stainless steel
- flux
- slag
- filler metal
- 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.)
- Expired
Links
- 238000003466 welding Methods 0.000 claims description 56
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 230000004907 flux Effects 0.000 claims description 22
- 239000000945 filler Substances 0.000 claims description 19
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 12
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000011324 bead Substances 0.000 description 27
- 239000002893 slag Substances 0.000 description 18
- 239000007789 gas Substances 0.000 description 12
- 229910001220 stainless steel Inorganic materials 0.000 description 11
- 239000010935 stainless steel Substances 0.000 description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000010953 base metal Substances 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910002593 Fe-Ti Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910001512 metal fluoride Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
Description
（産業上の利用分野）
本発明はオーステナイト系ステンレス鋼のTIG
溶接による初層裏波溶接方法に関するものであ
る。
（従来の技術）
ステンレス鋼の通常溶接には被覆アーク溶接、
MIG溶接、TIG溶接および潜弧溶接法といずれ
も適用可能であるが、ステンレス鋼の片面溶接に
ついては裏ビードが安定して形成されるTIG溶接
法が初層溶接にもつとも広く普及されている。
TIG溶接による初層の裏ビード形成には表側の
みならず表ビード側にもアルゴンガスを流して、
いわゆるバツクシールドをして表ビードと同様に
大気からの酸化を防ぐようにする必要がある。
ステンレス鋼を片側からしか溶接出来ない例と
しては、小径パイプのように内面からの溶接が出
来ない場合や１パスの溶接で終了するような薄板
の溶接の場合などがある。ところがステンレス鋼
は薄板として使用に供せられる場合が多く、また
小径のパイプとして使用される場合も多く、これ
らの接合に当つて今後ますますステンレス鋼の片
面溶接が必要とされるものと考えられる。
（発明が解決しようとする問題点）
TIG溶接による片面溶接は上述したように裏ビ
ード側も大気からの保護が必要でアルゴンガスに
よるバツクシールド方式によつてなされている。
また、パイプの溶接ではパイプの中をアルゴンガ
スで満たしておく例が多く、アルゴンガスとして
は、ばく大な量を必要とし不経済な溶接と言わざ
るを得ない。
バツクシールドガスとしてアルゴンガスより安
価な窒素ガスを用いることも検討されているが、
シールド性が充分でなく、かつブローホールの発
生原因ともなつて問題が生ずる。
薄板の溶接では特別な装置等が開発、提案され
ているが対象とする被溶接材の溶接線は必ずしも
単純な溶接線のみではなく、複雑な溶接線もあ
り、どのような溶接線でも追随し得るような互換
性のある装置の開発は容易でなく、かつ裏側が非
常にせまくシールド用の装置を装入することが出
来ない場合も生ずる。
（問題点を解決するための手段）
本発明者らはこのような問題点について種々検
討した結果、バツクシールドガスを省略しても健
全な初層裏波ビードを得る手段として主にスラグ
形成剤からなるフラツクスをオーステナイト系ス
テンレス鋼で形成されるワイヤにワイヤ重量比で
５〜25％の割合で充填した溶加材を用いてTIG溶
接を行うと、溶加材はTIG溶接に際し、アークの
熱で溶融し、溶接金属が裏ビードを形成すると共
にその際生ずるスラグが裏ビードを被包し大気に
よる酸化を防止し、バツクシールドガスを用いな
くても健全な初層裏波ビードが得られるという全
く新たな知見を得た。
即ち、本発明は、オーステナイト系ステンレス
鋼のTIG溶接による初層裏波溶接において、フラ
ツクス全重量に対し、TiO2を30〜85％含有する
フラツクスをオーステナイト系ステンレス鋼ケー
スで形成されるワイヤ中にワイヤ重量比で５〜25
％充填した溶加材を用い、バツクシールドガスを
省略して初層裏波溶接を行うことを特徴とするオ
ーステナイト系ステンレス鋼の初層裏波溶接方法
を要旨とするもである。
以下に本発明を詳細に説明する。
（作用）
まず、本発明TIGにおいて用いる溶接用溶加材
の構成について述べると、溶接部においてステン
レス鋼として耐食性、低温および常温での機械的
性質を確保するために必要な合金元素はおもにワ
イヤを形成するケースに添加し、片面溶接におけ
る裏ビードの健全性を確保するためのフラツクス
はケースより添加される合金元素の不足分を補な
う合金成分と共にワイヤ内に充填する。
次にステンレス鋼ケースについて述べると、
JIS G4305に規定されているオーステナイト系ス
テンレス鋼成分のものであつてケースの成分とし
てはCr16〜28％、Ni6〜22.5％、Mo4％以下、
Mn2.5％以下、Si0.6％以下、Cu2.5％以下、Nb1
％以下、Ti1％以下、の範囲で１種以上含有せし
めたものである。
裏ビードを保護するスラグを生成させるために
必要なフラツクスについて述べると、スラグが一
様に裏ビード表面を覆うことが必須条件であり、
この目的を満足するのは、フラツクス全重量に対
し、TiO2を30〜85％含有する場合である。なお、
本発明で言うTiO2とは、ルチール、チタン白、
チタン酸カリ中のTiO2をさすものであり、いず
れを使用してもその効果は同じである。
以下、本発明において用いられる溶加材の構成
について述べる。
溶加材に充填するフラツクスの組成として、
TiO2が30％に満たない場合は、スラグが一様に
裏ビードを覆わず、ビードが処々露出していると
ころがみられ、露出した部分が大気により酸化さ
れ、Ｘ線性能試験において第１種および第２種の
欠陥がみられ、その分類等級は３級となり実用上
問題がある。したがつて、TiO2が30％以上必要
である。
TiO2の含有量には適正範囲があり30％以上85
％までは裏ビードのスラグ被包性が良好である
が、85％を超えるとスラグが一様に裏ビードを覆
わずビードが処々露出しているところがみられ、
露出した部分が大気により酸化され、Ｘ線性能試
験において第１種および第２種の欠陥がみられ、
その分類等級はいずれも３級であり、実用上問題
がある。したがつて、TiO2は、30％以上で、か
つ85％以下でなければならない。
なお、フラツクス組成として上述したTiO2の
他に、その他として硅砂、アルミナ、カリ長石、
硅灰石、酸化ジルコニウム、酸化マグネシウム、
金属弗化物、金属炭酸塩、Fe−Al、Fe−Ti、Fe
−Si、Fe−Mn、Al−Mg、Fe−Cr、Cr、Ni、
Mnなどを適宜含有してもスラグの被包性をそこ
なうものではない。
次にスラグの被包性に及ぼす要因として、フラ
ツクス組成と共にスラグ生成量があり、これはワ
イヤへのフラツクスの充填率によつて支配され
る。溶加材へのフラツクスの充填率が５％未満の
場合、生成するスラグ量が少なすぎて裏ビード全
体を覆わないで、処々溶接金属が露出するところ
がみられ、露出した部分が酸化される。
また充填率が25％を超えると生成するスラグ量
が多すぎて溶融プール内にあふれアークの集中性
を悪くすると共にタングステン電極先端に付着し
てタングステン電極を損傷することが多くなり正
常な溶接の持続がむずかしくなる。したがつてワ
イヤへのフラツクスの充填率は５〜25％でなけれ
ばならない。
ここで本発明において用いるTIG溶接用溶加材
の製造方法の一例について言及するとステンレス
鋼ケースと充填するフラツクスを準備してフープ
を用いてケースに形成したワイヤにフラツクスを
充填して成型したのち100〜450℃で１時間以上乾
燥するか、又はケース材を円筒に成形し、合せめ
をTIG溶接にて溶接したパイプにフラツクスを充
填し、適宜中間焼鈍を行いながら伸線する。
以下に本発明の効果を実施例により、さらに具
体的に述べる。
（実施例）
第１表にケースの化学成分を示す。３成分とも
それぞれ同一鋼塊より加工した。
第２表に母材の化学成分を示す。母材の寸法は
板厚10mm、巾150mm、長さ200mmとした。
第３表には第１表のケース材とワイヤに充填す
るフラツクスとの組合せによるTIG溶接用溶加材
の組成を示す。
第４表には第３表に示すワイヤと母材の組合せ
にて第１図に示す要領によりTIG溶接を実施し、
裏ビードのスラグ被包状況、裏ビードの酸化状況
の観察結果、ならびにＸ線性能試験結果を示す。
なお、第１図ａは斜視図、ｂは正面図であり図
面中、１はTIGトーチノズル、２はタングステン
電極、３はTIG溶接用溶加材、４はアーク、５は
母材、６は溶接金属、Ｗは溶接方向を夫々示すも
のである。
試験に用いた母材の開先形状は第２図に示す如
くで、開先角度θ＝80゜、ルートフエースｆ＝２
mm、ルートギヤツプｇ＝2.5mmである。
溶接条件は、電源として直流垂下特性TIG溶接
用電源を用い、電源特性は直流正極性で電極はト
リウム入りタングステン電極3.2mmφを用い、シ
ールドガスはAr、流量15／minとした。この
時の溶接電流は150〜200Amp、溶接電圧11〜
15Volt、溶接姿勢は下向、溶接トーチの運行お
よび溶加材の挿入操作は手動で行なつた。
Ｘ線性能は、JIS Z3106「ステンレス鋼溶接部
の放射線透過試験方法および透過写真の等級分類
方法」により第１種欠陥（ブローホールおよびこ
れに類する丸みを帯びた欠陥）と第２種欠陥（細
長いスラグ巻込みおよびこれに類する欠陥）につ
いて欠陥の等級分類を行なつた。
裏ビードのスラグ被包状況、および裏ビードの
酸化状況の観察は目視にて行なつた。
溶加材記号No.１、２、５、６、９、10、11、
12、17および18は、ケース材を円筒に成形し、合
せめをTIG溶接にて溶接した外径９mm、肉厚1.0
mmのパイプに、フラツクスを充填したのち伸線し
て所定の寸法にしたものをもちい、溶加材記号No.
３、４、７、８、13、14、15、16、19、20および
21は、厚さ0.2mm、巾22mmのフープのケース材を
Ｕ形に成形した溝にフラツクスを充填したのち、
円筒に成形し、伸線したものをもちいた。
ワイヤの寸法は、それぞれの溶加材記号ごとに
直径1.6mm、2.0mm、2.4mm、3.2mmがあり、長さは
いずれも1000mmで、それらは同一フラツクス組成
であり、ケース材とフラツクスの重量比も同一で
ある。
以上から、本発明の溶加材記号No.１〜16は、バ
ツクシールドガスを使用しなくても、溶接金属が
裏ビードを形成すると共に、その際生ずるスラグ
が裏ビード全体を被包し、大気による酸化を防止
し、健全な裏ビードが得られることは明らかであ
る。
これに対し、比較例のNo.17は、TiO2が30％未
満であり、No.18は、TiO2が85％を超えており、
No.19および20はフラツクス充填率が３および４％
であり、いずれも処々ビードのスラグ被包性が一
様でなく、処々露出しているところがみられ、露
出した部分が大気により酸化され、Ｘ線性能試験
において、第１種および第２種欠陥がみられ、そ
の分類等級は３級であり、実用上問題がある。
また、No.21はフラツクス充填率が25％を超えて
おり、裏ビードの被包性は良好であつたが、スラ
グ量が多すぎてスラグが電極に接触して電極先端
を損傷し、溶接作業がやりにくく、Ｘ線性能試験
において、第２種の欠陥がみられ、その分類等級
は３級であり、実用上問題がある。
（発明の効果）
以上の実施例からも明らかなように、本発明
TIG溶接用溶加材は、ステンレス鋼の特性をそこ
なうことがなく、バツクシールドガスを使用しな
くてもステンレス鋼のTIG片面溶接が容易にで
き、産業上の効果は極めて顕著である。
(Industrial Application Field) The present invention relates to TIG of austenitic stainless steel.
The present invention relates to a method for welding the first layer of uranami by welding. (Conventional technology) Conventional welding of stainless steel includes covered arc welding,
MIG welding, TIG welding, and submerged arc welding are all applicable, but for single-sided welding of stainless steel, the TIG welding method, which stably forms a back bead, is widely used for first-layer welding. To form the back bead of the first layer by TIG welding, argon gas is flowed not only on the front side but also on the front bead side.
It is necessary to use a so-called back shield to prevent oxidation from the atmosphere in the same way as the front bead. Examples of stainless steel that can only be welded from one side include cases where welding from the inside is not possible, such as small diameter pipes, and cases where welding of thin plates can be completed in one pass. However, stainless steel is often used in the form of thin plates and also in small diameter pipes, and it is thought that single-sided welding of stainless steel will become increasingly necessary in the future for these joints. . (Problems to be Solved by the Invention) As mentioned above, in single-sided welding by TIG welding, the back bead side also needs to be protected from the atmosphere, and is done by a backshield method using argon gas.
Furthermore, when welding pipes, the inside of the pipe is often filled with argon gas, which requires a large amount of argon gas, making welding uneconomical. The use of nitrogen gas, which is cheaper than argon gas, as a backshield gas is also being considered;
Problems arise because the shielding properties are not sufficient and it also causes blowholes to occur. Special equipment has been developed and proposed for welding thin plates, but the welding line of the target material is not necessarily a simple welding line, but also a complex welding line, and it is difficult to follow any welding line. It is not easy to develop such a compatible device, and there are cases where the back side is so narrow that it is impossible to insert a shielding device. (Means for Solving the Problems) As a result of various studies on these problems, the present inventors found that a slag-forming agent was mainly used as a means to obtain a sound initial layer under-wave bead even if the backshield gas was omitted. When TIG welding is performed using a filler metal in which a wire made of austenitic stainless steel is filled with a flux consisting of 5 to 25% of the weight of the wire, the filler metal absorbs the heat of the arc during TIG welding. The weld metal melts and forms a back bead, and the slag produced at that time covers the back bead and prevents oxidation from the atmosphere, making it possible to obtain a healthy first-layer back bead without using backshield gas. I gained completely new knowledge. That is, the present invention provides a method for injecting a flux containing 30 to 85% TiO 2 into a wire formed with an austenitic stainless steel case in TIG welding of austenitic stainless steel. 5 to 25 in wire weight ratio
The gist of the present invention is a method for welding an initial layer of austenitic stainless steel using a filler metal filled with a filler metal of 1.5% and omitting a backshield gas. The present invention will be explained in detail below. (Function) First, to describe the composition of the filler metal for welding used in the TIG of the present invention, the alloying elements necessary for ensuring corrosion resistance and mechanical properties at low and room temperatures as stainless steel in the welding part are mainly used in the wire. Flux is added to the case to be formed to ensure the soundness of the back bead during single-sided welding, and is filled into the wire along with an alloy component that makes up for the deficiency of the alloy elements added from the case. Next, let's talk about the stainless steel case.
It is an austenitic stainless steel composition specified by JIS G4305, and the case composition is Cr16-28%, Ni6-22.5%, Mo4% or less,
Mn2.5% or less, Si0.6% or less, Cu2.5% or less, Nb1
% or less and Ti 1% or less. Regarding the flux required to generate the slag that protects the back bead, it is essential that the slag uniformly covers the back bead surface.
This objective is satisfied when TiO 2 is contained in an amount of 30 to 85% based on the total weight of the flux. In addition,
In the present invention, TiO 2 refers to rutile, titanium white,
It refers to TiO 2 in potassium titanate, and the effect is the same no matter which one is used. The structure of the filler metal used in the present invention will be described below. As for the composition of the flux to be filled into the filler metal,
If the TiO 2 content is less than 30%, the slag does not cover the back bead uniformly, and the bead is exposed in some places.The exposed parts are oxidized by the atmosphere, and the A type 2 defect was observed, and the classification grade was 3rd grade, which is a practical problem. Therefore, 30% or more of TiO 2 is required. There is an appropriate range of TiO 2 content, 30% or more85
%, the slag coverage of the back bead is good, but when it exceeds 85%, the slag does not cover the back bead uniformly and the bead is exposed in some places.
The exposed parts were oxidized by the atmosphere, and type 1 and type 2 defects were observed in the X-ray performance test.
Their classification grades are all 3rd grade, which poses a practical problem. Therefore, TiO 2 must be greater than or equal to 30% and less than or equal to 85%. In addition to the above-mentioned TiO 2 flux composition, other components include silica sand, alumina, potassium feldspar,
wollastonite, zirconium oxide, magnesium oxide,
Metal fluoride, metal carbonate, Fe-Al, Fe-Ti, Fe
−Si, Fe−Mn, Al−Mg, Fe−Cr, Cr, Ni,
Even if an appropriate amount of Mn or the like is contained, the encapsulation properties of the slag will not be impaired. Next, factors affecting the slag encapsulation include the flux composition and the amount of slag produced, which is controlled by the flux filling rate into the wire. When the flux filling rate in the filler metal is less than 5%, the amount of slag generated is too small to cover the entire back bead, and the weld metal is exposed in some places, and the exposed parts are oxidized. In addition, if the filling rate exceeds 25%, too much slag will be generated, overflowing into the molten pool and worsening the concentration of the arc, as well as adhering to the tip of the tungsten electrode and damaging the tungsten electrode, which will prevent normal welding. It becomes difficult to sustain. Therefore, the flux filling rate in the wire must be between 5 and 25%. Here, referring to an example of a method for producing filler metal for TIG welding used in the present invention, a stainless steel case and a flux to be filled are prepared, a wire is formed into a case using a hoop, the flux is filled and molded, and then 100 Dry at ~450°C for 1 hour or more, or form the case material into a cylinder, fill the pipe with TIG welding at the joint, and draw the pipe while appropriately performing intermediate annealing. The effects of the present invention will be described in more detail below with reference to Examples. (Example) Table 1 shows the chemical components of the case. All three components were processed from the same steel ingot. Table 2 shows the chemical composition of the base material. The dimensions of the base material were 10 mm thick, 150 mm wide, and 200 mm long. Table 3 shows the composition of filler metal for TIG welding based on the combination of the case material shown in Table 1 and the flux filled in the wire. Table 4 shows TIG welding performed using the wire and base metal combinations shown in Table 3 according to the procedure shown in Figure 1.
The observation results of the slag envelopment status of the back bead, the oxidation status of the back bead, and the results of the X-ray performance test are shown. In Figure 1, a is a perspective view, and b is a front view. In the drawings, 1 is a TIG torch nozzle, 2 is a tungsten electrode, 3 is a filler metal for TIG welding, 4 is an arc, 5 is a base metal, and 6 is a welding part. Metal and W indicate the welding direction, respectively. The groove shape of the base material used in the test is as shown in Figure 2, with groove angle θ = 80° and root face f = 2.
mm, root gap g = 2.5 mm. The welding conditions were as follows: A TIG welding power source with DC droop characteristics was used as the power source, the power source characteristics were DC positive polarity, the electrode was a thorium-containing tungsten electrode with a diameter of 3.2 mm, the shielding gas was Ar, and the flow rate was 15/min. Welding current at this time is 150~200Amp, welding voltage 11~
The welding temperature was 15 Volt, the welding position was downward, and the welding torch movement and filler metal insertion were performed manually. X-ray performance is determined according to JIS Z3106 "Radioscopic testing method and radiographic grading method for stainless steel welds" for type 1 defects (blowholes and similar rounded defects) and type 2 defects (elongated Defects (slag entrainment and similar defects) were graded. The slag envelopment state of the back bead and the oxidation state of the back bead were visually observed. Filler metal symbol No. 1, 2, 5, 6, 9, 10, 11,
12, 17 and 18 are made by molding the case material into a cylinder and welding the joints using TIG welding, with an outer diameter of 9 mm and a wall thickness of 1.0 mm.
mm pipe filled with flux and drawn to the specified dimensions, with filler metal symbol No.
3, 4, 7, 8, 13, 14, 15, 16, 19, 20 and
21 is a U-shaped hoop case material with a thickness of 0.2 mm and a width of 22 mm. After filling the groove with flux,
It was formed into a cylinder and drawn into wire. The wire dimensions are 1.6 mm, 2.0 mm, 2.4 mm, and 3.2 mm in diameter for each filler metal symbol, and the length is 1000 mm. They have the same flux composition, and the weight of the case material and flux The ratio is also the same. From the above, filler metal symbols Nos. 1 to 16 of the present invention allow the weld metal to form a back bead and the slag produced at that time to cover the entire back bead without using a back shield gas. It is clear that oxidation caused by the atmosphere can be prevented and a healthy back bead can be obtained. On the other hand, Comparative Example No. 17 has less than 30% TiO 2 , and No. 18 has more than 85% TiO 2 .
No.19 and 20 have a flux filling rate of 3 and 4%.
In both cases, the slag coverage of the bead is not uniform in some places, and some parts are exposed in some places.The exposed parts are oxidized by the atmosphere, and in the The classification grade is 3rd grade, which poses a practical problem. In addition, in No. 21, the flux filling rate exceeded 25%, and the encapsulation of the back bead was good, but the amount of slag was too large and the slag came into contact with the electrode, damaging the electrode tip and causing welding. It is difficult to work with, and type 2 defects were observed in the X-ray performance test, and its classification grade was grade 3, which is a practical problem. (Effect of the invention) As is clear from the above examples, the present invention
Filler metals for TIG welding do not impair the properties of stainless steel, and can easily perform single-sided TIG welding of stainless steel without using backshield gas, and have extremely significant industrial effects.
【表】【table】
【表】【table】
【表】【table】
【表】【table】
第１図は、実施例における溶接要領を示す図
で、ａは斜視図、ｂは正面図、第２図は実施例に
用いた開先形状を示す図である。
１……TIGトーチノズル、２……電極、３……
TIG溶接用溶加材、４……アーク、５……母材、
６……溶接金属、Ｗ……溶接方向。
FIG. 1 is a diagram showing the welding procedure in the example, in which a is a perspective view, b is a front view, and FIG. 2 is a diagram showing the groove shape used in the example. 1...TIG torch nozzle, 2...electrode, 3...
Filler metal for TIG welding, 4... Arc, 5... Base metal,
6...Weld metal, W...Welding direction.
Claims (1)
よる初層裏波溶接において、フラツクス全重量に
対し、TiO2を30〜85％含有するフラツクスをオ
ーステナイト系ステンレス鋼ケースで形成される
ワイヤ中にワイヤ重量比で５〜25％充填した溶加
材を用い、バツクシールドガスを省略して初層裏
波溶接を行うことを特徴とするオーステナイト系
ステンレス鋼の初層裏波溶接方法。1. In the first layer back wave welding by TIG welding of austenitic stainless steel, a flux containing 30 to 85% of TiO 2 based on the total weight of the flux is added to the wire formed with an austenitic stainless steel case at a wire weight ratio of 5%. A method for welding the first layer of austenitic stainless steel using a filler metal filled with up to 25% and omitting the backshield gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1606579A JPS55109595A (en) | 1979-02-16 | 1979-02-16 | Filler rod for tig welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1606579A JPS55109595A (en) | 1979-02-16 | 1979-02-16 | Filler rod for tig welding |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11244487A Division JPS6390393A (en) | 1987-05-11 | 1987-05-11 | Tig one side welding method without using back shielding gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55109595A JPS55109595A (en) | 1980-08-23 |
| JPS6324799B2 true JPS6324799B2 (en) | 1988-05-23 |
Family
ID=11906163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1606579A Granted JPS55109595A (en) | 1979-02-16 | 1979-02-16 | Filler rod for tig welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55109595A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5410382B2 (en) * | 2010-07-30 | 2014-02-05 | 新興プランテック株式会社 | Welding method for austenitic stainless steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1373209A (en) * | 1972-05-26 | 1974-11-06 | Chemetron Corp | Welding electrode |
| JPS5215247A (en) * | 1975-07-28 | 1977-02-04 | Nec Corp | Automatic equalizer |
-
1979
- 1979-02-16 JP JP1606579A patent/JPS55109595A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1373209A (en) * | 1972-05-26 | 1974-11-06 | Chemetron Corp | Welding electrode |
| JPS5215247A (en) * | 1975-07-28 | 1977-02-04 | Nec Corp | Automatic equalizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55109595A (en) | 1980-08-23 |
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