JPH0256198B2 - - Google Patents
Info
- Publication number
- JPH0256198B2 JPH0256198B2 JP29045386A JP29045386A JPH0256198B2 JP H0256198 B2 JPH0256198 B2 JP H0256198B2 JP 29045386 A JP29045386 A JP 29045386A JP 29045386 A JP29045386 A JP 29045386A JP H0256198 B2 JPH0256198 B2 JP H0256198B2
- Authority
- JP
- Japan
- Prior art keywords
- titanium
- palladium
- corrosion resistance
- ruthenium
- welding
- 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
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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550°C
- B23K35/325—Ti as the principal constituent
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Description
（目 的）
この出願の発明は、チタン又はチタン合金部材
を溶接する際に用いる耐食性に優れたチタン基合
金製溶接棒に関する。
（従来技術及び問題点）
チタンは、その高い耐食性を活して、現在、熱
交換器、ソーダ電解用電極、化学プラント等に広
く利用されている。一般に、このような装置を作
るにあたつては、しばしばチタンを溶接して装置
をくみたてることが行われている、このような場
合、溶接部は例えば、文献「チタン・ジルコニウ
ム」Vol.34、No.１、1986年P21〜P29にあるよう
に、耐食性が母材部に較べ劣化する傾向にある。
これにより、腐食環境によつては溶接部のみが優
先的に腐食してしまい、結果として装置全体に大
きな被害を与えることとなる。このような欠点を
改善するため、過去色々な方策がなされてきた。
例えば、材料に最初からチタンより耐食性が高い
Ti―0.15Pd合金を使うことが考えられる。しか
しこれは、価格的に非常に高いTi―0.15Pd合金
を大量に使用することになり実際的ではない。
一方、溶接し終えた後、溶接部表面をパラジウ
ムコーテイングする方法も考えられるが、これも
工程が増えて経済性に劣り、また、パラジウムコ
ーテイングがはがれやすいなどの欠点もあるた
め、これも実際的でない。
上記の方法に対し、特公昭56−34393において、
多量のパラジウムを含む合金を溶接棒として使用
する方法が提案されている。
これは、前記の２例より実際的であり、溶接時
においても面倒な手順を踏む必要がない利点があ
る。しかしながら、このパラジウムを含む溶接棒
は、前記の例と同様に高価なパラジウムを多量に
含んでいるため依然として非常に価格が高い欠点
を有している。
（発明の構成）
発明者は、上記のような問題点を改善するため
鋭意研究を重ねた結果、これを解決するまつたく
新しい方法を見い出した。すなわち、重量％でニ
ツケル0.2〜５％、及びルテニウム0.01〜2.0％、
パラジウム0.01〜2.0％の金属元素から選択した
１種又は２種を含有し、残部チタン及び不可避的
不純物からなるチタン基合金製溶接棒を使用する
ことにより耐食性に優れたチタン又はチタン合金
部材の溶接部を得ることに成功した。
本発明の最大の特長は、上記のように溶接棒と
してチタンにニツケルとルテニウム若しくはパラ
ジウム又はニツケル、ルテニウム、パラジウムを
同時に添加したチタン基合金を使用することであ
る。チタンにパラジウム若しくはルテニウムをよ
り多く添加すればそれだけ耐食性が向上するが、
いずれの金属とも非常に価格が高いため、できる
だけ使用量を減らすことが必要となる。このた
め、本発明ではニツケルを添加することにより耐
食性を落とさずルテニウム、パラジウムの添加量
を低くすることに成功した。これにより、本発明
方法では、従来のTi―Pdより低価格の溶接棒が
使用でき、しかも溶接部の耐食性はTi―0.15Pd
溶接棒とまつたく劣ることがない。
なお、不純物として含有される鉄は0.1％以下
とする必要がある。溶接部に鉄が多く入りこむと
耐食性が著しく劣化するので上記のようにその上
限を0.1％とする。本発明の上記溶接棒は例えば
７mm以下の角形若しくは丸形線材として使用す
る。
以下、実施例に基づき本発明を具体的に説明す
る。
（実施例）
５mm×100mm×50mmの２枚のチタン板を65゜の開
先をつくり突合わせ、本発明方法及び従来方法
（溶接棒としてTi―Pd合金若しくは純チタンを用
いる）によりTIG溶接を行い供試材とした。第１
図に、溶接後の供試材の概略図を示す。
本発明の溶接棒として、Ti―0.05Ru―0.5Ni及
びTi―0.05Pd―0.5Niを用いて溶接した溶接部
と、比較材として溶接棒に純チタン及び市販され
ているＴ―0.15Pd合金を用いて溶接した溶接部の
腐食試験を行つた。その結果を第１表に示す。
第１表は、塩酸１％水溶液を沸とう状態にして
供試材の腐食速度を調べたものであり、母材部の
腐食速度に比較して溶接棒として純チタンをもち
いたものは、耐食性が劣つていることがわかる。
一方、Ti―0.15Pd及び本発明のTi―0.05Ru―
0.5Ni及びTi―0.05Pd―0.5Niの溶接棒にて作製
したものは耐食性が母材部より優れていることが
わかる。又、その耐食性はTi―0.15Pd、Ti―
0.05Ru―0.5Ni、Ti―0.05Pd―0.5Niのいずれを
用いてもほとんど同じである。すなわち、Ti―
0.15Pdにくらべ本発明の溶接棒であるTi―
0.05Ru―0.5Ni及びTi―0.05Pd―0.5Niは、高価
なルテニウム若しくはパラジウムの使用量が1/3
となつており、価格的に非常に有利である。本発
明方法が耐食性を犠牲にすることなく価格的に非
常に有利であることがこれにより理解できる。
次に、Ti―Ru―Ni溶接棒のルテニウム、パラ
ジウムとニツケルの成分量を変化させた場合の溶
接部の腐食速度を調べた結果を第２表に示す。
No.１、No.６は、本特許成分範囲の下限の合金で
あり、腐食速度は、純チタンの母材部とほぼ同じ
となつており、これ以上ニツケル、ルテニウム、
パラジウムを低下させることは母材部より溶接部
の耐食性が劣つてしまう。したがつて、ニツケル
の下限は0.2％とし、ルテニウム、パラジウムの
下限は0.01％とする必要がある。
No.２、No.３は、No.１に対しニツケルの含有量を
増した合金であり、あきらかにニツケルを増すこ
とにより溶接部の耐食性はます。しかし、ニツケ
ルを多く含有すると加工性がわるくなり、溶接棒
の製造が難しくなるためニツケルの上限は５％と
した。
No.４、No.５は、No.１に対しルテニウムの含有量
を増した合金であり、あきらかにルテニウムを増
すことにより溶接部の耐食性はましている。しか
し、ルテニウムを多く含有しすぎると、価格が非
常に高くなると同時に加工性も悪くなるためその
上限を2.0％とした。
No.６〜No.10は、ルテニウムにかわりパラジウム
を添加した場合であり、その結果はルテニウムの
場合と同様である。
（効 果）
以上、チタン又はチタン合金の溶接に際し本発
明の溶接棒を用いることによつて経済性に優れ、
しかも著しい耐食性を有する溶接部が得られる。
(Purpose) The invention of this application relates to a titanium-based alloy welding rod that has excellent corrosion resistance and is used when welding titanium or titanium alloy members. (Prior Art and Problems) Due to its high corrosion resistance, titanium is currently widely used in heat exchangers, electrodes for soda electrolysis, chemical plants, and the like. Generally, when making such a device, titanium is often welded to assemble the device. As shown in No. 1, 1986, pages 21 to 29, the corrosion resistance tends to deteriorate compared to the base material.
As a result, depending on the corrosive environment, only the welded portion will corrode preferentially, resulting in great damage to the entire device. Various measures have been taken in the past to improve these shortcomings.
For example, the material has higher corrosion resistance than titanium from the beginning.
It is possible to use Ti-0.15Pd alloy. However, this is not practical because it requires the use of a large amount of Ti-0.15Pd alloy, which is extremely expensive. On the other hand, it is possible to coat the surface of the welded part with palladium after welding is completed, but this also increases the number of steps and is less economical.Also, it also has disadvantages such as the palladium coating peeling off easily, so this is also not practical. Not. Regarding the above method, in Japanese Patent Publication No. 56-34393,
A method has been proposed in which an alloy containing a large amount of palladium is used as a welding rod. This is more practical than the above two examples, and has the advantage that there is no need to take any troublesome steps during welding. However, this palladium-containing welding rod still has the drawback of being very expensive because it contains a large amount of expensive palladium, similar to the above example. (Structure of the Invention) As a result of intensive research to improve the above-mentioned problems, the inventor has discovered a brand new method to solve the problems. That is, nickel 0.2-5% and ruthenium 0.01-2.0% by weight,
Welding of titanium or titanium alloy parts with excellent corrosion resistance by using a titanium-based alloy welding rod containing one or two metal elements selected from 0.01 to 2.0% palladium, with the remainder being titanium and unavoidable impurities. succeeded in obtaining a division. The greatest feature of the present invention is that, as described above, a titanium-based alloy in which nickel and ruthenium or palladium, or nickel, ruthenium, and palladium are simultaneously added to titanium, is used as a welding rod. The more palladium or ruthenium added to titanium, the better the corrosion resistance.
Since both metals are extremely expensive, it is necessary to reduce their usage as much as possible. Therefore, in the present invention, by adding nickel, we succeeded in reducing the amount of ruthenium and palladium added without reducing the corrosion resistance. As a result, in the method of the present invention, a welding rod that is cheaper than the conventional Ti-Pd can be used, and the corrosion resistance of the welded part is lower than that of Ti-0.15Pd.
It is in no way inferior to a welding rod. Note that iron contained as an impurity must be 0.1% or less. If too much iron enters the weld, the corrosion resistance will deteriorate significantly, so the upper limit is set at 0.1% as mentioned above. The welding rod of the present invention is used, for example, as a square or round wire of 7 mm or less. Hereinafter, the present invention will be specifically explained based on Examples. (Example) Two titanium plates measuring 5 mm x 100 mm x 50 mm were butted together with a 65° groove, and TIG welded using the method of the present invention and the conventional method (using a Ti-Pd alloy or pure titanium as the welding rod). It was used as a test material. 1st
The figure shows a schematic diagram of the sample material after welding. Welding parts welded using Ti-0.05Ru-0.5Ni and Ti-0.05Pd-0.5Ni as the welding rods of the present invention, and pure titanium and commercially available T-0.15Pd alloys as welding rods for comparison. Corrosion tests were conducted on welded parts using the same method. The results are shown in Table 1. Table 1 shows the corrosion rate of the test materials when boiling a 1% aqueous solution of hydrochloric acid. Compared to the corrosion rate of the base metal, the corrosion resistance of the welding rod made of pure titanium was is found to be inferior. On the other hand, Ti-0.15Pd and Ti-0.05Ru- of the present invention
It can be seen that those made using 0.5Ni and Ti-0.05Pd-0.5Ni welding rods have better corrosion resistance than the base metal. In addition, its corrosion resistance is Ti―0.15Pd, Ti―
It is almost the same whether 0.05Ru-0.5Ni or Ti-0.05Pd-0.5Ni is used. In other words, Ti-
Compared to 0.15Pd, the welding rod of the present invention is Ti-
0.05Ru-0.5Ni and Ti-0.05Pd-0.5Ni use 1/3 the amount of expensive ruthenium or palladium.
Therefore, it is very advantageous in terms of price. It can be seen from this that the method according to the invention is very advantageous in terms of cost without sacrificing corrosion resistance. Next, Table 2 shows the results of investigating the corrosion rate of the weld when varying the content of ruthenium, palladium, and nickel in the Ti-Ru-Ni welding rod. No. 1 and No. 6 are alloys at the lower limit of the patented component range, and the corrosion rate is almost the same as that of the base material of pure titanium.
Decreasing the palladium content will result in the welded part having poorer corrosion resistance than the base metal. Therefore, the lower limit for nickel needs to be 0.2%, and the lower limit for ruthenium and palladium needs to be 0.01%. No. 2 and No. 3 are alloys with increased nickel content compared to No. 1, and the corrosion resistance of the welded area is clearly improved by increasing the nickel content. However, if a large amount of nickel is contained, workability deteriorates, making it difficult to manufacture a welding rod, so the upper limit of nickel was set at 5%. No. 4 and No. 5 are alloys with increased ruthenium content compared to No. 1, and the corrosion resistance of the welded part is clearly improved by increasing the ruthenium content. However, if too much ruthenium is contained, the price becomes very high and the processability deteriorates, so the upper limit was set at 2.0%. Nos. 6 to 10 are cases in which palladium was added instead of ruthenium, and the results were the same as in the case of ruthenium. (Effects) As mentioned above, by using the welding rod of the present invention when welding titanium or titanium alloy, it has excellent economic efficiency.
Moreover, a welded part with remarkable corrosion resistance can be obtained.
【表】【table】
【表】【table】
第１図は溶接部の概略説明図である。 １：母材部、２：溶接部。 FIG. 1 is a schematic explanatory diagram of a welded part. 1: Base metal part, 2: Welding part.
Claims (1)
ム0.01〜2.0％、パラジウム0.01〜2.0％の金属元
素から選択した１種又は２種を含有し、残部チタ
ン及び不可避的不純物からなるチタン基合金製溶
接棒。1 Welded titanium-based alloy containing one or two metal elements selected from the following metal elements: 0.2 to 5% by weight of nickel, 0.01 to 2.0% of ruthenium, and 0.01 to 2.0% of palladium, with the remainder being titanium and unavoidable impurities. rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29045386A JPS63144892A (en) | 1986-12-08 | 1986-12-08 | Welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29045386A JPS63144892A (en) | 1986-12-08 | 1986-12-08 | Welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63144892A JPS63144892A (en) | 1988-06-17 |
| JPH0256198B2 true JPH0256198B2 (en) | 1990-11-29 |
Family
ID=17756222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29045386A Granted JPS63144892A (en) | 1986-12-08 | 1986-12-08 | Welding rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63144892A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140079881A1 (en) * | 2012-09-20 | 2014-03-20 | Pessach Seidel | Corrosion resistant compositions for titanium brazing and coating applications and methods of application |
| CN104084712B (en) * | 2014-07-04 | 2016-08-24 | 哈焊所华通（常州）焊业股份有限公司 | The titanium alloy welding low-cost titanium alloy welding wire that a kind of corrosion resistance is strong |
-
1986
- 1986-12-08 JP JP29045386A patent/JPS63144892A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63144892A (en) | 1988-06-17 |
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