JPH0237836B2 - - Google Patents
Info
- Publication number
- JPH0237836B2 JPH0237836B2 JP59276285A JP27628584A JPH0237836B2 JP H0237836 B2 JPH0237836 B2 JP H0237836B2 JP 59276285 A JP59276285 A JP 59276285A JP 27628584 A JP27628584 A JP 27628584A JP H0237836 B2 JPH0237836 B2 JP H0237836B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- metal
- welding
- flux
- back bead
- 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 - Lifetime
Links
- 238000003466 welding Methods 0.000 claims description 47
- 239000002893 slag Substances 0.000 claims description 43
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 36
- 230000004907 flux Effects 0.000 claims description 26
- 239000000945 filler Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 229910001512 metal fluoride Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- 239000011324 bead Substances 0.000 description 27
- 230000000694 effects Effects 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 4
- 239000000463 material Substances 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
- 230000015572 biosynthetic process Effects 0.000 description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 235000010215 titanium dioxide Nutrition 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000036544 posture Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910016569 AlF 3 Inorganic materials 0.000 description 1
- 229910016036 BaF 2 Inorganic materials 0.000 description 1
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 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
- 239000010433 feldspar Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- -1 illuminite Chemical compound 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
Landscapes
- Nonmetallic Welding Materials (AREA)
Description
〔産業上の利用分野〕
本発明は、あらゆる溶接姿勢においてバツクシ
ールドガスを使用することなしに健全なビード殊
に裏ビードを得ることができるTIG溶接用溶加材
に関するものである。
〔従来の技術〕
ステンレス鋼やNi合金等を片面から溶接する
場合においては片面TIG溶接を採用することが多
いが、この様な片面TIG溶接を行なうに当たつて
はバツクシールドガスを使用するのが一般的であ
る。しかし溶接設計の煩雑さや狭溢部分溶接にお
けるシールドガス供給の困難性等を考慮するとバ
ツクシールドガスを使用しなくとも健全な裏ビー
ドを得ることができる様なTIG溶接用溶加材の提
供が要望されており、例えば特開昭55−109595号
が提案されている。該溶加材は金属外皮で囲まれ
る腔部にフラツクスを充填した複合ワイヤであつ
て、生成スラグによつて裏ビードを被包し、外気
からの遮断を達成するので健全な裏ビードを得る
ことができる。ところで片面TIG溶接は比較的小
径のパイプの周溶接に適用されることが多く、そ
の際パイプを固定して溶接するのが一般的である
から全姿勢溶接を採用できるものであることが不
可欠とされている。しかるに上記提案に係る溶加
材は下向姿勢において目的を達成できるに過ぎ
ず、立向姿勢や上向姿勢等における溶接作業性は
必ずしも満足できるものではなかつた。
即ち下向姿勢ではスラグにより裏ビードの被包
が比較的容易に実現できるが、立向姿勢や上向姿
勢においてはスラグの垂れ落ちスラグ量の不足に
よつて裏ビードの被包が不十分になる傾向があ
り、裏ビードを健全なものにすることができなか
つた。しかも配合によつてはスパツタの発生ある
いはスラグの飛散の伴ないタングステン電極が著
しく消耗するという欠点があつた。
〔発明が解決しようとする問題点〕
本発明はこうした事情に着目してなされたもの
であつて、全溶接姿勢においてバツクシールドガ
スを使用しなくとも健全な裏ビードを得ることが
でき、しかも溶接作業性が良好なTIG溶接用溶加
材を提供しようとするものである。
〔問題点を解決する為の手段〕
上記目的を達成した本発明の溶加材は、金属外
皮で囲まれる腔部にフラツクスを充填したTIG溶
接用溶加材であつて、フラツクス中に溶加材全重
量に対して
TiO2:4.5〜8.5%
金属弗化物:0.20〜1.75(弗素量換算)
SiO2:0.2〜2.5%
を含有すると共に、金属炭酸塩総含有量を1.0%
以下とし、且てスラグ形成剤の合計含有量を6〜
10%とした点に要旨を有するものである。
〔作用〕
本発明は、立向姿勢や上向姿勢を含む全姿勢に
よつて片面TIG溶接を行なうに当たり、良好な裏
ビード皮包性、溶接作業性、溶接後のスラグ剥離
性等を得ようとするものであり、金属外皮で囲ま
れる腔部に充填されるフラツクスの配合量を次の
様に規定したものである。以下各フラツクス成分
について順を追つて説明する。尚配合量はいずれ
も溶加材全重量に対する割合を意味する。
TiO2:4.5〜8.5%
TiO2は上記要求特性を発揮し得る上で最も優
れたスラグ形成剤であり、フラツクス成分として
4.5〜8.5%含有させる必要がある。含有量が4.5%
未満では裏ビードの被包性が十分でない。一方
8.5%を超えて含有させると、フラツクス部分の
溶融性が悪い為に外皮金属のみが溶融し中央のフ
ラツクスが未溶融状態で長く突き出た形となり溶
接作業性が著しく悪化する。TiO2源としてはル
チール、チタン白、イルミナイト、チタン酸カリ
等が挙げられる。
金属弗化物:0.20〜1.75%(弗素量換算)
溶融スラグに適度な流動性を与え裏ビードの被
包性を高めるが、0.20%未満では十分な効果が得
られない。一方1.75を超えて含有させるとスラグ
が流動し易くなり過ぎて溶接作業性が悪化するだ
けでなく、熱分解によつて発生する弗素系ガス量
が増加し、溶接作業環境が劣悪となる。この様な
金属弗化物としては、CaF2、MgF2、BaF2、
AlF3、LiF、NaF、Na3AlF6等が挙げられる。
SiO2:0.2〜2.5%
裏ビードを安定して被包する上で優れた効果を
発揮するスラグ形成剤であつて、スラグに適度な
粘性および表面張力を付与するので良好な裏ビー
ドを安定して形成し且つ溶接金属の健全性を確保
し、しかも良好なX線性能等を与える。しかし
0.2%未満では効果が認められず、一方2.5%を超
えて含有させるとスラグの剥離性が悪くなり、溶
接後の清掃作業等に多大の労力が必要になる。こ
の様なSiO2源としては珪砂、珪灰石、長石等が
挙げられる。
金属炭酸塩:1.0%以下
金属炭酸塩はアーク安定作用を有するが、溶接
時に熱分解してスパツタの発生並びに溶融スラグ
の飛散の原因となる。またスパツタの発生は溶融
スラグ浴の揺動を招き、タングステン電極にスパ
ツタやスラグが付着することによつてタングステ
ン電極の消耗を促進する。これらの結果溶接作業
性が著しく妨げられる。この様に金属炭酸塩は
TIG溶接を行なう上で悪影響が大きく、含有させ
ないことが望まいが、許容し得る限度は1.0%で
ある。尚炭酸塩としてはCaCO3、MgCO3、
BaCO3、MnCO3、Li2CO3、SrCO3等が挙げられ
る。
スラグ形成剤の合計含有量:6〜10%
スラグ形成剤としては上記成分及び上記成分以
外の金属酸化物、金属弗化物、金属炭酸塩並びに
それらの複合化合物等が含まれる。この様なスラ
グ形成剤の合計含有量は、裏ビードを大気から遮
断し保護する為必要スラグ量を確保する上で6〜
10%とすべきである。6%未満では立向姿勢や上
向姿勢において裏ビードを完全に被包することが
できない。一方10%を超えると溶融スラグ量が過
多になり開先内の前方にまでスラグが流れ出る。
特に上向姿勢ではスラグが垂れ下がつて溶接作業
が極めて因難になる。尚上記以外のスラグ形成剤
としてはZrO2、Al2O3、CaO、BaO、MgO、
MnO、FeO、K2O、Na2O、Bi2O3等が挙げられ
る。
本発明の基本構成は上記の通りであり、これに
よつて溶融スラグに適度な粘度あるいは流動性が
与えられるだけでなくスパツタの発生やスラグの
飛散が防止され、更に金属外皮の内部に充填した
フラツクス部分の溶融性が良好であることに起因
して溶加材としての溶融性も高められる。
尚溶加材の溶融性を更に高める手段としては上
記の如くフラツクス組成を調整するだけでなく、
例えば一旦溶融した後凝固させることによつて融
点を低下させたフラツクス原料を使用することが
推奨され、溶融性改善効果が一層高められ優れた
溶接作業性を得ることができる。
又溶加材中のSiは裏ビードの形成性に寄与し、
特に裏ビード側端部におけるスラグの被包性を向
上させる。この為には少なくとも0.5%のSiを含
有させることが望ましいが、1.5%を超えて含有
させると溶接金属の耐割れ性や高温使用時の脆化
感受性等が増大するという好ましくない事態が発
生する。従つてSi含有量は0.5〜1.5%とすること
が望ましい。尚Siは充填フラツクスへの添加のみ
ならず、金属外皮中に添加しても同様の効果を発
揮するので金属外皮とフラツクスの両者に含まれ
るSi量が上記範囲であればよい。
その他金属外皮の成分組成については、被溶接
金属の種類に対応させて、共金系あるいは非共金
系の金属を適宜選択すればよい。
〔実施例〕
第1表に示す成分組成の金属外皮中に第2表に
示すフラツクスを充填した複合ワイヤを使用し、
JIS−G−4305に規定されるステンレス鋼板製若
しくはインコネル合金板製のパイプ(100mm〓×6
mmt及び300mm〓×12mmt)の全姿勢TIG溶接を行な
つた。溶接条件は下記の通りとした。溶接結果を
溶接作業性、スラグの被包性、裏ビードの形成状
況、スラグ剥離性、X線透過試験結果等によつて
評価したところ第2表に示す結果が得られた。
(溶接条件)
溶接電源:直流垂下特性
極性:直流正極性
溶接電圧:10〜15V
溶接電流:80〜130A
条件:1層1パス溶接
電極:トリウム入りタングステン3.2mm〓
シールドガス:Ar、15/min
開先形状:第1図に示す通り
[Industrial Field of Application] The present invention relates to a filler metal for TIG welding that can obtain a sound bead, especially a back bead, in any welding position without using a backshield gas. [Conventional technology] Single-sided TIG welding is often used when welding stainless steel, Ni alloys, etc. from one side, but when performing such single-sided TIG welding, it is recommended to use backshield gas. is common. However, considering the complexity of welding design and the difficulty of supplying shielding gas in narrow welding, there is a demand for a filler metal for TIG welding that can obtain a sound back bead without using backshielding gas. For example, Japanese Patent Application Laid-Open No. 109595/1983 has been proposed. The filler material is a composite wire in which a cavity surrounded by a metal shell is filled with flux, and the back bead is covered with the produced slag to achieve insulation from the outside air, so that a healthy back bead can be obtained. Can be done. By the way, single-sided TIG welding is often applied to circumferential welding of relatively small-diameter pipes, and since it is common to weld the pipes in a fixed position, it is essential to be able to use all-position welding. has been done. However, the filler metal according to the above proposal can only achieve its purpose in a downward position, and welding workability in an upright position, an upward position, etc. is not necessarily satisfactory. In other words, in the downward position, the slag can cover the back bead relatively easily, but in the upright or upward position, the back bead is insufficiently covered due to insufficient amount of slag dripping down. Therefore, it was not possible to make the back bead sound. Moreover, depending on the formulation, there was a drawback that the tungsten electrode was considerably worn out due to the generation of spatter or the scattering of slag. [Problems to be Solved by the Invention] The present invention has been made in view of these circumstances, and it is possible to obtain a sound back bead in all welding positions without using back shield gas, and also to improve the welding process. The purpose is to provide a filler metal for TIG welding that has good workability. [Means for Solving the Problems] The filler metal of the present invention that has achieved the above object is a filler metal for TIG welding in which a cavity surrounded by a metal skin is filled with flux. Contains TiO2 : 4.5-8.5%, metal fluoride: 0.20-1.75 (in terms of fluorine amount) SiO2 : 0.2-2.5%, and the total metal carbonate content is 1.0% based on the total weight of the material.
or less, and the total content of the slag forming agent is 6 to 6.
The gist of this is that it is set at 10%. [Function] The present invention aims to obtain good back bead covering properties, welding workability, slag removability after welding, etc. when performing single-sided TIG welding in all postures including vertical and upward postures. The amount of flux to be filled into the cavity surrounded by the metal shell is defined as follows. Each flux component will be explained in order below. It should be noted that all blending amounts refer to proportions to the total weight of the filler material. TiO 2 :4.5-8.5% TiO 2 is the best slag forming agent that can exhibit the above required properties, and is used as a flux component.
It is necessary to contain 4.5 to 8.5%. Content is 4.5%
If it is less than that, the encapsulation of the back bead will not be sufficient. on the other hand
If the content exceeds 8.5%, the meltability of the flux portion is poor, so only the outer metal is melted, leaving the central flux in an unmelted state protruding for a long time, resulting in a marked deterioration in welding workability. Examples of the TiO 2 source include rutile, titanium white, illuminite, potassium titanate, and the like. Metal fluoride: 0.20 to 1.75% (in terms of fluorine content) Provides appropriate fluidity to the molten slag and improves the encapsulation of the back bead, but if it is less than 0.20%, a sufficient effect cannot be obtained. On the other hand, if the content exceeds 1.75, the slag becomes too fluid and welding workability deteriorates, and the amount of fluorine gas generated by thermal decomposition increases, resulting in a poor welding work environment. Such metal fluorides include CaF 2 , MgF 2 , BaF 2 ,
Examples include AlF 3 , LiF, NaF, Na 3 AlF 6 and the like. SiO 2 : 0.2-2.5% A slag forming agent that exhibits an excellent effect in stably enclosing the back bead. It imparts appropriate viscosity and surface tension to the slag, so it stabilizes a good back bead. This ensures the integrity of the weld metal and provides good X-ray performance. but
If the content is less than 0.2%, no effect will be observed, while if the content exceeds 2.5%, the slag removability will be poor and a great deal of effort will be required for cleaning work after welding. Examples of such SiO 2 sources include silica sand, wollastonite, and feldspar. Metal carbonate: 1.0% or less Metal carbonate has an arc stabilizing effect, but it thermally decomposes during welding, causing spatter and scattering of molten slag. Furthermore, the generation of spatter causes the molten slag bath to vibrate, and the spatter and slag adhere to the tungsten electrode, thereby accelerating the wear of the tungsten electrode. As a result, welding workability is significantly hindered. In this way, metal carbonates
It has a significant negative effect on TIG welding, so it is desirable not to include it, but the permissible limit is 1.0%. Carbonates include CaCO 3 , MgCO 3 ,
Examples include BaCO 3 , MnCO 3 , Li 2 CO 3 and SrCO 3 . Total content of slag forming agents: 6 to 10% The slag forming agents include the above-mentioned components, metal oxides, metal fluorides, metal carbonates, and composite compounds thereof in addition to the above-mentioned components. The total content of such slag-forming agents should be 6 to 6 to ensure the necessary amount of slag to shield and protect the back bead from the atmosphere.
Should be 10%. If it is less than 6%, the back bead cannot be completely encapsulated in an upright or upward position. On the other hand, if it exceeds 10%, the amount of molten slag will be excessive and the slag will flow to the front of the groove.
Particularly in the upward position, the slag hangs down, making welding work extremely difficult. Slag forming agents other than those mentioned above include ZrO 2 , Al 2 O 3 , CaO, BaO, MgO,
Examples include MnO, FeO, K 2 O, Na 2 O, Bi 2 O 3 and the like. The basic structure of the present invention is as described above, which not only gives the molten slag an appropriate viscosity or fluidity, but also prevents the generation of spatter and the scattering of the slag, and also prevents the molten slag from being filled inside the metal shell. Due to the good meltability of the flux portion, the meltability as a filler material is also improved. In addition to adjusting the flux composition as described above, methods for further increasing the meltability of the filler metal include
For example, it is recommended to use a flux raw material whose melting point is lowered by once melting and then solidifying it, so that the effect of improving meltability is further enhanced and excellent welding workability can be obtained. In addition, Si in the filler metal contributes to the formation of the back bead,
In particular, it improves the slag envelopment at the back bead side end. For this reason, it is desirable to contain at least 0.5% of Si, but if it is contained in excess of 1.5%, an undesirable situation will occur in which the cracking resistance of the weld metal and the susceptibility to embrittlement during high-temperature use will increase. . Therefore, it is desirable that the Si content be 0.5 to 1.5%. Note that Si exhibits the same effect not only when added to the filling flux but also when added to the metal sheath, so the amount of Si contained in both the metal sheath and the flux may be within the above range. Regarding the other components of the metal sheath, a matching metal or a non-matching metal may be appropriately selected depending on the type of metal to be welded. [Example] Using a composite wire in which the flux shown in Table 2 was filled in the metal shell having the composition shown in Table 1,
Pipe made of stainless steel plate or Inconel alloy plate specified in JIS-G-4305 (100mm〓×6
mm t and 300 mm × 12 mm t ) all-position TIG welding was performed. The welding conditions were as follows. The welding results were evaluated based on welding workability, slag encapsulation, back bead formation, slag removability, X-ray transmission test results, etc., and the results shown in Table 2 were obtained. (Welding conditions) Welding power source: DC drooping characteristics Polarity: DC positive Welding voltage: 10 to 15V Welding current: 80 to 130A Conditions: 1 layer, 1 pass Welding electrode: Thorium-containing tungsten 3.2 mm Shielding gas: Ar, 15/min Groove shape: As shown in Figure 1
【表】
(%)
【table】
(%)
【表】【table】
【表】
No.1、2はTiO2含有量が少ない為裏ビードに
対するスラグ被包性が悪くなり、満足できるビー
ドを形成することができなかつた。No.3はTiO2
含有量が過多である比較例で、スラグの被包性は
良好であり一応裏ビードは形成されるがワイヤ中
のフラツクスが溶融し難く突出する為溶接作業性
が悪く、又上向姿勢において溶接金属中に未溶融
のワイヤが混入することがX線透過試験により確
認された。No.4は金属弗化物が不足する為スラグ
被包性が悪化した。No.5は金属弗化物が過多であ
る為スラグの流動性が過度に高くなり、下向姿勢
においては開先内前方に溶融スラグが流れて溶接
作業性が悪化した。又立向姿勢や上向姿勢におい
てはスラグが流出する結果裏ビードに対するスラ
グ被包性が悪化し、満足できる裏ビードを形成す
ることができなかつた。No.6はSiO2が不足する
為スラグ被包性が若干悪く裏ビードの形成性もや
や悪かつた。No.7はSiO2が過多である比較例で、
ほぼ良好な結果が得られているがスラグの剥離性
は満足できるものではなかつた。No.8、9は金属
炭酸塩が1.0%を超えて含有される為作業性が悪
化した。No.10はスラグ形成剤が不足している為ス
ラグ被包性が悪く裏ビードの形成性が悪化した。
No.11〜13はスラグ形成剤の合計含有量が過多であ
る為特に下向姿勢において溶融スラグが開先前方
に充満し、溶接作業性が劣悪になつた。No.14〜21
はいずれも本発明要件を満足する実施例であり、
良好な結果が得られた。
次にフラツクスとして一旦溶融後冷却したフラ
ツクスを添加した場合について述べる。
第1表のAで示される金属外皮中に第4表に示
すフラツクスを充填した複合ワイヤを使用して、
JIS−G−4305に規定されるステンレス鋼板製パ
イプ(100mm〓×6mmt及び300〓×12mm〓)の全姿勢
TIG溶接を前記と同様の溶接条件で行なつたとこ
ろ第4表に示す結果が得られた。尚溶融処理フラ
ツクスの化学成分及び融点は第3表に示す通りで
あり、又フラツクス成分組成は該溶融処理フラツ
クスと単体フラツクスを加えたフラツクスの成分
組成を示す。[Table] In Nos. 1 and 2, the TiO 2 content was low, so the slag envelopment of the back bead was poor, and a satisfactory bead could not be formed. No.3 is TiO2
In the comparative example where the slag content is excessive, the slag coverage is good and a back bead is formed, but the flux in the wire is difficult to melt and protrudes, resulting in poor welding workability and welding in an upward position. It was confirmed by an X-ray transmission test that unmelted wire was mixed into the metal. No. 4 had poor slag encapsulation due to lack of metal fluoride. In No. 5, the fluidity of the slag became excessively high due to the excessive amount of metal fluoride, and in the downward position, the molten slag flowed forward inside the groove, worsening welding workability. Furthermore, in the upright or upward position, the slag flows out, resulting in poor slag envelopment of the back bead, making it impossible to form a satisfactory back bead. In No. 6, due to the lack of SiO 2 , the slag envelopment was slightly poor and the ability to form a back bead was also slightly poor. No. 7 is a comparative example with too much SiO 2 .
Approximately good results were obtained, but the slag removability was not satisfactory. Nos. 8 and 9 had poor workability because they contained more than 1.0% of metal carbonate. No. 10 had poor slag envelopment and poor back bead formation due to insufficient slag forming agent.
In Nos. 11 to 13, the total content of slag forming agents was excessive, so the front part of the groove was filled with molten slag especially in the downward position, resulting in poor welding workability. No.14~21
are all examples that satisfy the requirements of the present invention,
Good results were obtained. Next, a case will be described in which a flux that has been melted and then cooled is added as the flux. Using a composite wire filled with the flux shown in Table 4 in the metal sheath shown by A in Table 1,
All positions of stainless steel plate pipes (100mm〓×6mm t and 300〓×12mm〓) specified in JIS-G-4305
When TIG welding was performed under the same welding conditions as above, the results shown in Table 4 were obtained. The chemical composition and melting point of the melt-treated flux are shown in Table 3, and the flux component composition indicates the composition of the flux including the melt-treated flux and the single flux.
【表】
第3表に示す溶融処理フラツクスはいずれも単
体の融点(TiO2:1640℃、CaF2:1386℃)より
低い融点を有しており、単体フラツクスより溶け
易い性質を持つている。[Table] All of the melt-treated fluxes shown in Table 3 have melting points lower than the melting points of the simple substances (TiO 2 : 1640°C, CaF 2 : 1386°C), and have the property of being easier to melt than the simple substance fluxes.
【表】【table】
本発明は以上の様に構成されており、全溶接姿
勢においてバツクシールドガスを使用することな
くTIG溶接を行なうに当たり、本発明に係る溶加
材を使用することにより健全な裏ビードを得るこ
とができる。
The present invention is constructed as described above, and when performing TIG welding without using back shield gas in all welding positions, it is possible to obtain a sound back bead by using the filler metal according to the present invention. can.
第1図は開先形状を示す断面説明図である。 FIG. 1 is an explanatory cross-sectional view showing the groove shape.
Claims (1)
したTIG溶接用溶加材であつて、フラツクス中に TiO2:4.5〜8.5%(対溶加材全重量に対する百分
率の意味、以下同じ) 金属弗化物:0.20〜1.75%(弗素量換算) SiO2:0.2〜2.5% を含有すると共に、金属炭酸塩含有量を1.0%以
下とし、且つスラグ形成剤の合計含有量を6〜10
%としたことを特徴とするTIG溶接用溶加材。[Scope of Claims] 1. A filler metal for TIG welding in which a cavity surrounded by a metal shell is filled with flux, wherein the flux contains TiO 2 at 4.5 to 8.5% (meaning the percentage relative to the total weight of the filler metal). , hereinafter the same) Metal fluoride: 0.20 to 1.75% (in terms of fluorine amount) SiO 2 : 0.2 to 2.5%, the metal carbonate content is 1.0% or less, and the total content of slag forming agents is 6%. ~Ten
% filler metal for TIG welding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27628584A JPS61154793A (en) | 1984-12-27 | 1984-12-27 | Filler metal for tig welding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27628584A JPS61154793A (en) | 1984-12-27 | 1984-12-27 | Filler metal for tig welding |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61154793A JPS61154793A (en) | 1986-07-14 |
JPH0237836B2 true JPH0237836B2 (en) | 1990-08-27 |
Family
ID=17567313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27628584A Granted JPS61154793A (en) | 1984-12-27 | 1984-12-27 | Filler metal for tig welding |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61154793A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2746046A1 (en) * | 1996-03-13 | 1997-09-19 | Soudure Autogene Francaise | TIG welding |
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 |
---|---|---|---|---|
JPS5944159A (en) * | 1982-09-07 | 1984-03-12 | Nippon Telegr & Teleph Corp <Ntt> | Surge protecting circuit of telephone set |
JPS5945476A (en) * | 1982-09-08 | 1984-03-14 | Canon Inc | Fixation device |
-
1984
- 1984-12-27 JP JP27628584A patent/JPS61154793A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5944159A (en) * | 1982-09-07 | 1984-03-12 | Nippon Telegr & Teleph Corp <Ntt> | Surge protecting circuit of telephone set |
JPS5945476A (en) * | 1982-09-08 | 1984-03-14 | Canon Inc | Fixation device |
Also Published As
Publication number | Publication date |
---|---|
JPS61154793A (en) | 1986-07-14 |
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