JP2595983B2 - Metal chrome welding method - Google Patents
Metal chrome welding methodInfo
- Publication number
- JP2595983B2 JP2595983B2 JP62215070A JP21507087A JP2595983B2 JP 2595983 B2 JP2595983 B2 JP 2595983B2 JP 62215070 A JP62215070 A JP 62215070A JP 21507087 A JP21507087 A JP 21507087A JP 2595983 B2 JP2595983 B2 JP 2595983B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- chromium
- metal
- welded portion
- welded
- 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 - Fee Related
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
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は耐蝕材料として用いられる金属クロムの溶接
方法に関するものである。The present invention relates to a method for welding chromium metal used as a corrosion-resistant material.
（従来の技術） 一般的に金属クロムは水素脆性をほとんど示さないた
めに、バルク中に不純物として混入している水素は比較
的高い値を示すことが多い。従って、通常のアルゴン雰
囲気下で溶接を行う方法によって金属クロムの溶接を行
った場合、溶接ビードに水素を主成分とするガスが残留
し、溶接部には多数のブローホールが発生してしまう。
また溶接部にブローホールが存在していると、これを起
点として溶接部にクラックが生じやすくなり、機械的性
質は著しく低下してしまう。(Prior Art) Generally, metallic chromium hardly shows hydrogen embrittlement, so that hydrogen mixed as an impurity in a bulk often shows a relatively high value. Accordingly, when chromium metal is welded by a method of welding in a normal argon atmosphere, a gas containing hydrogen as a main component remains in the weld bead, and a large number of blow holes are generated in the welded portion.
Also, if a blowhole is present in the welded portion, cracks are likely to occur in the welded portion starting from the blowhole, and the mechanical properties are significantly reduced.
そこで、従来、耐蝕材料として用いられる金属クロム
は溶接を行わず、機械的な加工を施し構造材として用い
られているが、金属クロムは加工性に乏しいものであ
り、構造材の形状は限られてしまう。Therefore, conventionally, metal chromium used as a corrosion resistant material is used as a structural material by performing mechanical processing without welding, but metal chromium is poor in workability, and the shape of the structural material is limited Would.
（発明が解決しようとする問題点） 本発明の目的は、得られる溶接部でのブローホール発
生を抑止する金属クロムの溶接方法を提供することにあ
る。(Problems to be Solved by the Invention) It is an object of the present invention to provide a method for welding metal chromium, which suppresses the occurrence of blowholes in the obtained welded portion.
（問題点を解決するための手段） 本発明者等は上記問題点を解決するために鋭意検討を
行った結果、金属クロム中の水素を除去しながら溶接を
行えば、溶接部でのブローホール発生を抑止できること
を見出し本発明を完成するに至った。(Means for Solving the Problems) As a result of intensive studies to solve the above problems, the present inventors have found that if welding is performed while removing hydrogen in metallic chromium, blowholes at the welded portions can be obtained. It has been found that generation can be suppressed, and the present invention has been completed.
すなわち本発明は、0.1〜10.0容量％の酸素を含む不
活性ガス雰囲気で、且つ、水素含有量を100ppm以下にし
つつアーク溶接を行うことを特徴とする金属クロムの溶
接方法である。That is, the present invention is a method for welding chromium metal, wherein arc welding is performed in an inert gas atmosphere containing 0.1 to 10.0% by volume of oxygen and with a hydrogen content of 100 ppm or less.
本発明における溶接手段は、雰囲気下にて行う溶接手
段であればどのような溶接手段を用いて行ってもよい
が、簡便に行うことができるタングスンイナートガス溶
接（TIG溶接）やメタルイナートガス溶接（MIG溶接）な
どのアーク溶接法を採用することが好ましい。As the welding means in the present invention, any welding means may be used as long as the welding means is carried out in an atmosphere. It is preferable to employ an arc welding method such as MIG welding.
また、雰囲気下にて溶接を行う場合の溶接としては、
雰囲気ガス中での溶接やシールドガスを用いた溶接など
が挙げられるが、この雰囲気ガスまたはシールドガス
は、酸素を含む不活性ガスとしなければならない。この
ときの酸素の濃度は、溶接する金属クロム中の水素含有
量によっても異なるが0.1〜10.0容量％とし、更に雰囲
気ガスは0.1〜5.0容量％，シールドガスは0.1〜3.0容量
％として用いることが好ましい。また、不活性ガスとし
て窒素を用いた場合、得られる金属クロムの溶接部が脆
化してしまうので、この不活性ガスは例えばヘリウムや
アルゴンなど溶接部に影響を与えないものを用いること
が好ましい。In addition, as welding when performing welding in an atmosphere,
Examples include welding in an atmosphere gas and welding using a shield gas. The atmosphere gas or the shield gas must be an inert gas containing oxygen. The oxygen concentration at this time depends on the hydrogen content in the metallic chromium to be welded, but it should be 0.1 to 10.0% by volume, the atmosphere gas should be 0.1 to 5.0% by volume, and the shielding gas should be 0.1 to 3.0% by volume. preferable. When nitrogen is used as the inert gas, the resulting welded portion of chromium metal is embrittled. Therefore, it is preferable to use an inert gas such as helium or argon that does not affect the welded portion.
このように酸素を含む不活性ガス雰囲気下にて溶接を
行った場合、溶接の際に凝集する金属クロム中の水素
は、酸素と共にH2Oとなって溶接部より排除されるの
で、溶接部でのブローホール発生は抑止される。しか
し、酸素濃度が0.1容量％より少ない場合や溶接時間が
短すぎる場合、ブローホール発生を抑止する効果は期待
できず、酸素濃度が10.0容量％を越える場合や溶接時間
が長すぎる場合、ブローホール発生を抑止することはで
きるが、溶接部に酸素が固溶してしまい、得られる溶接
部は加工性に乏しいものとなるおそれがある。When welding is performed in an inert gas atmosphere containing oxygen in this way, hydrogen in the metallic chromium that aggregates during welding becomes H 2 O together with oxygen and is eliminated from the welded portion. The occurrence of blowholes is suppressed. However, if the oxygen concentration is less than 0.1% by volume or the welding time is too short, the effect of suppressing the occurrence of blowholes cannot be expected. If the oxygen concentration exceeds 10.0% by volume or the welding time is too long, Although generation can be suppressed, oxygen may form a solid solution in the welded portion, and the resulting welded portion may have poor workability.
本発明の方法によって得られる金属クロムの溶接部
は、ブローホールが少ないものであり、溶接のプレート
試験で得られた溶接ビードの方向に垂直に切断し、切断
面の顕微鏡映像から測定されるビート内の単位面積当た
りのブローホールの面積割合は、5.0％以下となる。ま
た、その機械的性質は優れたものであり、TIG溶接のプ
レート試験を行って得られた溶融ビードが中央部に位置
する試験片の引張度は、アルゴン雰囲気下にて溶接を行
って得た溶接部より大きな値を示す。The chromium metal weld obtained by the method of the present invention has few blowholes, is cut perpendicularly to the direction of the weld bead obtained in the plate test of welding, and is a beat measured from a microscopic image of the cut surface. The area ratio of blowholes per unit area is less than 5.0%. In addition, its mechanical properties are excellent, and the tensile strength of the test piece located at the center where the molten bead obtained by performing the TIG welding plate test was obtained by welding under an argon atmosphere. The value is larger than that of the welded part.
更に、本発明によって溶接する金属クロムは特に限定
はしないが、例えば高純度の金属クロムあるいは高クロ
ム合金材など耐蝕材料として用いられる構造材を得るの
に適した金属クロムなどを挙げることができる。また、
溶接部でのブローホール発生の抑止を効果的に行うため
には、溶接を行う金属クロムの水素含有量は少ないこと
が好ましいが、水素含有量が100ppm以下の金属クロムで
あれば良好に溶接中のブローホール発生を抑止すること
ができる。Further, the chromium metal to be welded according to the present invention is not particularly limited. For example, chromium metal suitable for obtaining a structural material used as a corrosion-resistant material such as high-purity metal chromium or a high chromium alloy material can be used. Also,
In order to effectively suppress the occurrence of blowholes at the welded portion, it is preferable that the hydrogen content of the metal chromium to be welded be small, but if the hydrogen content is 100 ppm or less, the metal chromium is well welded. Can suppress the occurrence of blowholes.
（発明の効果） 以上述べたように、本発明の溶接方法により得られた
金属クロムの溶接部は、ブローホールが少なくなるの
で、その機械的性質は母材と比較してほとんど褪色のな
いものとなる。従って、金属クロムの加工を行うにあた
り、従来行われなかった溶接による加工が可能となり、
含雑な形状の金属クロム構造材が得られるようになる。(Effects of the Invention) As described above, the welded portion of chromium metal obtained by the welding method of the present invention has less blowholes, so that its mechanical properties are hardly discolored as compared with the base material. Becomes Therefore, when processing metal chromium, it is possible to perform processing by welding that has not been performed conventionally,
A metal chromium structural material having a complicated shape can be obtained.
（実施例） 以下、実施例により本発明を更に詳しく説明するが、
本発明は何らこれらに限定されるものではない。(Examples) Hereinafter, the present invention will be described in more detail with reference to Examples.
The present invention is not limited to these.
実施例１ 表１に示した不純物を含有する金属クロムを40×100
×2mmの溶接試験片とし、TIG溶接のプレート試験を行っ
た。Example 1 Metal chromium containing impurities shown in Table 1 was 40 × 100
A plate test of TIG welding was performed using a × 2 mm welding test piece.
溶接は、初期真空度が１×10-4Torrの可変雰囲気チャ
ンバ−内に酸素0.5容量％を含んだArを１気圧導入した
後、上記チャンバー内で行った。The welding was performed in a variable atmosphere chamber having an initial degree of vacuum of 1 × 10 −4 Torr, after introducing 1 atm of Ar containing 0.5% by volume of oxygen, and then in the chamber.
このとき溶接条件は、溶接速度0.1m/分，アークギャ
ップを1.0mm,チップアングル30deg,溶接電流170Aとし
た。The welding conditions at this time were a welding speed of 0.1 m / min, an arc gap of 1.0 mm, a tip angle of 30 deg, and a welding current of 170 A.
次いで、得られた溶接部を溶接ビードの方向に垂直に
切断し、切断面の顕微鏡映像からビード内の単位面積当
たりのブローホールの面積割合を測定した。その結果を
表２に示す。Next, the obtained welded portion was cut perpendicular to the direction of the weld bead, and the area ratio of blow holes per unit area in the bead was measured from a microscopic image of the cut surface. Table 2 shows the results.
次に、溶接試験を行った試験片を、切断して引張試験
を行った。このとき切断して得た試験片のサイズは、両
端を10×40×1.5mm,長手方向の中央部を５×40×1.5mm
とし、溶融ビードを中央部に位置させた。その結果を表
２に示す。Next, the test piece subjected to the welding test was cut and subjected to a tensile test. The size of the test piece obtained by cutting at this time was 10 × 40 × 1.5 mm at both ends and 5 × 40 × 1.5 mm at the center in the longitudinal direction.
And the molten bead was positioned at the center. Table 2 shows the results.
実施例２〜４ 表２に示す条件で溶接を行った以外は実施例１と同様
の溶接，溶接部の評価を行った。Examples 2 to 4 Welding and evaluation of welded portions were performed in the same manner as in Example 1 except that welding was performed under the conditions shown in Table 2.
その結果を表２に示す。 Table 2 shows the results.
比較例１〜３ 表２に示す条件で溶接を行った以外は実施例１と同様
の溶接，溶接部の評価を行った。Comparative Examples 1 to 3 The same welding and welded parts as in Example 1 were evaluated except that welding was performed under the conditions shown in Table 2.
その結果を表２に示す。 Table 2 shows the results.
表２より、本発明の溶接方法によって得られた金属ク
ロムの溶接部は、ブローホール発生が大幅に抑止されて
おり、その溶接部の引張り強度も大きな値を示すことが
わかる。 From Table 2, it can be seen that the occurrence of blowholes is greatly suppressed in the welded portion of chromium metal obtained by the welding method of the present invention, and that the tensile strength of the welded portion also shows a large value.
また、酸素を多く含む不活性ガス雰囲気下で溶接を行
った比較例３の溶接部は、ブローホール発生が抑止され
ているが、機械的性質は劣っていることがわかる。Further, it can be seen that in the welded portion of Comparative Example 3 where welding was performed in an inert gas atmosphere containing a large amount of oxygen, the occurrence of blowholes was suppressed, but the mechanical properties were inferior.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 溶接学会全国大会講演概要41集1987年 溶接学会発行 福田、中田、谷内、樋 高、国谷、［高純度クロム板の溶接性 （第４報）、Ｐ．298−299 溶接学会全国大会講演概要39集1986年 溶接学会発行 松田、中田、谷内、「高 純度クロム板の溶接性（第１報）、Ｐ. 172−173 ──────────────────────────────────────────────────続 き Continuing from the front page (56) References Welding Society of Japan Annual Meeting Summary 41 Vol. 1987 Published by The Japan Welding Society. P. 298-299 Summary of 39th Annual Meeting of the Japan Welding Society, Vol. 39, 1986, Japan Welding Society, Matsuda, Nakata, Taniuchi, "Weldability of high-purity chromium plate (1st report), pp. 172-173
Claims (1)
囲気で、且つ、水素含有量を100ppm以下にしつつアーク
溶接を行うことを特徴とする金属クロムの溶接方法。1. A method for welding metal chromium, comprising performing arc welding in an inert gas atmosphere containing 0.1 to 10.0% by volume of oxygen and with a hydrogen content of 100 ppm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62215070A JP2595983B2 (en) | 1987-08-31 | 1987-08-31 | Metal chrome welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62215070A JP2595983B2 (en) | 1987-08-31 | 1987-08-31 | Metal chrome welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6462277A JPS6462277A (en) | 1989-03-08 |
| JP2595983B2 true JP2595983B2 (en) | 1997-04-02 |
Family
ID=16666258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62215070A Expired - Fee Related JP2595983B2 (en) | 1987-08-31 | 1987-08-31 | Metal chrome welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2595983B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100776181B1 (en) * | 2005-08-11 | 2007-11-16 | 타이요 닛폰 산소 가부시키가이샤 | Shielding gas, welding method by using the same and weldment thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5432745B2 (en) * | 1971-09-14 | 1979-10-16 | ||
| JPS59183983A (en) * | 1983-04-04 | 1984-10-19 | Hitachi Seiko Ltd | High speed welding method |
-
1987
- 1987-08-31 JP JP62215070A patent/JP2595983B2/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 溶接学会全国大会講演概要３９集１９８６年溶接学会発行 松田、中田、谷内、「高純度クロム板の溶接性（第１報）、Ｐ．１７２−１７３ |
| 溶接学会全国大会講演概要４１集１９８７年溶接学会発行 福田、中田、谷内、樋高、国谷、［高純度クロム板の溶接性（第４報）、Ｐ．２９８−２９９ |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100776181B1 (en) * | 2005-08-11 | 2007-11-16 | 타이요 닛폰 산소 가부시키가이샤 | Shielding gas, welding method by using the same and weldment thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6462277A (en) | 1989-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |