JPH0453626B2 - - Google Patents
Info
- Publication number
- JPH0453626B2 JPH0453626B2 JP62187313A JP18731387A JPH0453626B2 JP H0453626 B2 JPH0453626 B2 JP H0453626B2 JP 62187313 A JP62187313 A JP 62187313A JP 18731387 A JP18731387 A JP 18731387A JP H0453626 B2 JPH0453626 B2 JP H0453626B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- composite material
- groove
- welded
- opening
- 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
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- Arc Welding In General (AREA)
Description
〔産業上の利用分野〕
本発明は、炭素鋼あるいは低合金鋼を母材と
し、ステンレス鋼あるいはNi基合金鋼を合材と
するクラツド材を溶接する方法に関する。
〔従来の技術〕
ギヤザリングライン等の未処理ガス輸送やケミ
カルプラント等の配管や板材には、耐食性や耐酸
性とともに、強度や靱性を要求される。
上記のような要求を満足させるとともに、経済
的観点から複合材料により構成されたクラツド材
が広範囲に使用されている。
上記クラツド材は、内面側に耐食性や耐酸性の
良好なステンレス鋼やNi基合金鋼よりなる合材
と、外面側に強度や靱性の良い炭素鋼や低合金鋼
よりなる母材とから構成され、いわゆるクラツド
鋼管等に成形、加工された後製品として使用され
る。
上記クラツド鋼管で大径管を製造する際は、前
記のクラツド材を公知のロールフオーミング方式
やUOE方式で成形した後、そのクラツド材端部
を縦シーム溶接し、製品とする行程を経る。
上記縦シーム溶接の行程で前述の合材や母材を
それぞれ溶接するが、上記母材の溶接を行う際母
材の溶着金属が上記合材に接し、上記合材の一部
が溶融すると、ステンレス鋼等を構成する元素の
CrやNi等が母材の溶着金属部分等に侵入濃化し、
合材の組成を変えるとともに材料劣化させる。
これを防止するための一方法として第２図に示
すように、合材１ｂの開先の開口幅１ｅを広くす
る方法が特開昭60−154875号公報に開示されてい
る。
第２図は上記特開昭60−154875号公報の方法を
示すもので、クラツド鋼管の軸方向の縦シームと
直交する断面を示す。
縦シーム溶接の際は、クラツド鋼管１の母材１
ａには、母材１ａの合材１ｂと接しない面つまり
外側と合材１ｂ側つまり内側とにそれぞれ開口１
ｃ，１ｄと、母材１ａの板厚方向で略中央部にル
ート面とを有するＸ形開先を設け、合材１ｂに
は、上記母材１ａに設けられた合材１ｂ側の開口
１ｄの幅よりも広く、上記母材１ａの開口１ｄを
溶接する際、溶着金属が接触しない幅を有した開
口１ｅを設け、まず母材１ａの内側の開口１ｄ、
次に母材１ａの外側の開口１ｃをそれぞれ潜弧溶
接法等で両面溶接した後、合材１ｂの開口１ｅ
を、TIG溶接法等で溶接する方法である。
上記溶接の際のそれぞれの溶接材料は一般に、
母材１ａ用としては母材１ａと同等成分の溶接材
料を使用し、合材１ｂ用としては合材１ｂと同等
またはそれ以上の高合金成分の溶接材料が使用さ
れている。
〔発明が解決しようとする問題点〕
上記のようなそれぞれの開口１ｃ，１ｄ，１ｅ
を有する開先や溶接順序や溶接材料を使用して行
うクラツド鋼管１の縦シーム溶接では、母材１ａ
の溶接の際内側の開口１ｄおよび外側の開口１ｃ
を少なくともそれぞれ１層づつ溶接することによ
り作業能率が低下したり、母材１ａの内側に開口
１ｄの開先を形成させると、上記開口１ｄの溶着
金属が合材１ｂに接触しないように合材１ｂに設
ける開口１ｅの幅を広くする必要がある。
さらに上記合材１ｂの開口１ｅの幅を広くする
と、肉盛体積が増加することにより溶接材料を多
く使用したり溶接能率が低下し経済的損失が大き
い。
これに加え、合材１ｂの開口１ｅの溶接の際、
母材１ａとの接触面積が増えているため、合材１
ｂの溶接入熱により母材１ａが溶融し、合材１ｂ
の溶接材料の化学成分のCrやNiが母材１ａに侵
入濃化し母材１ａの希釈率が増加するので、溶接
材料選定時、上記を考慮し合材１ｂの化学成分以
上の高合金成分を有するものを用いる必要があり
不経済であるとともに、合材１ｂの開口１ｅの幅
が15mmを超えた場合、母材１ａの希釈率は合材１
ｂの溶接法にもよるが30％〜60％となり、局部的
に母材１ａの組成も変化させるので、強度や靱性
を低下させる問題がある。
この発明は上記のような問題点を解消するため
になされたもので、母材１ａや合材１ｂの溶接能
率を向上できたり、合材１ｂの溶接材料を合材１
ｂの組成成分に近いものとしても、従来以上のす
ぐれた冶金的性能が得られるクラツド材を用いた
鋼管等の縦シーム溶接方法を提供することを目的
とする。
〔問題を解決するための手段〕
本発明は上記のような問題点を解決するため
に、炭素鋼あるいは低合金鋼を母材とし、ステン
レス鋼あるいはNi基合金鋼を合材とするクラツ
ド材相互を溶接する方法において、母材側にはＩ
開先あるいは開口部を有したＹ開先を設けるとと
もに、合材側には幅が15mm〜５mmの開口部を有し
た開先を設け、まず母材の溶接を母材側から１層
でかつ裏波が出る溶接をしたのち、合材を溶接す
るようにしたものである。
〔作用〕
この発明のクラツド材の溶接方法は、母材の溶
接を合材と反対側の外側より片面一層でかつ裏波
が出る溶接をすることにより、合材の開口すなわ
ち開先部を狭くすることができるので、合材の溶
接の際使用する溶接材料を減少させることができ
るとともに、溶着金属による母材の希釈率を低く
することができる。
〔発明の実施例〕
以下本発明の実施例を第１図に基づいて説明す
る。
第１図は本発明の実施状態を行程別に示す模式
図で、クラツド鋼管１の縦シーム溶接部の上記縦
シームと直交する断面図を示す。
第１図ａにおいて、クラツド鋼管１は、外側が
炭素鋼や低合金鋼の母材１ａと内側がステンレス
鋼やNi基合金鋼の合材１ｂよりなる。
母材の上記溶接部には母材１ａの板厚t1が厚板
の場合、溶着と裏波が確実に行なえるように母材
１ａの板厚t1よりも少ない深さｄと角度θ1とより
なる開口２ａと、ルート面２ｂ，２ｂとを具備し
てなる開先２が設けられている。
母材１ａの板厚t1が薄板の場合、上記溶接部は
溶着と裏波が確実に行なえるので、上記開先２に
上記開口２ａは設けなくても良い。
なお上記ルート面２ｂ，２ｂの間隔ｌは０〜
1.5mmとしている。
合材１ａの上記溶接部には、上記開先２のルー
ト面２ｂ，２ｂと接しない間隔Ｂの開口３ａを具
備してなる開先３が設けられている。
なお上記開先３の開口３ａを形成する合材１ｂ
の端面は溶接性を良くするために、板厚方向とは
角度θ2を有する斜面にするとともに、上記間隔Ｂ
は母材１ａの希釈率を低下させるために15mmを超
えないものとしている。最小の間隔Ｂは上記母材
１ａの溶接部の裏波の幅（５mm前後）が望まし
い。
上記のようなそれぞれの開先２，３を有するク
ラツド鋼管１の縦シーム溶接は、その材質、寸法
等の諸条件に整合する溶接法や溶接材料を選択し
以下の順序で行なわれる。
まず第１図ｂに示すように母材１ａの開先２を
開口２ａ側から一層盛でかつ裏波の出る溶接を行
い母材１ａの溶接４を完了し、次に第１図ｃに示
すように合材１ｂの開先３を一層盛以上の溶接で
行ない合材１ｂの溶接５を完了する。
第１表は上記母材１ａの溶接を潜弧溶接で行な
う際の適正な裏波が出る条件を示すもので、それ
ぞれの母材の板厚での開先形状、電極数、電流、
電圧および溶接速度である。
[Industrial Application Field] The present invention relates to a method for welding a clad material having a base material of carbon steel or low alloy steel and a composite material of stainless steel or Ni-based alloy steel. [Prior Art] Piping and plate materials for raw gas transportation such as gearing lines, chemical plants, etc. are required to have strength and toughness as well as corrosion resistance and acid resistance. Cladding materials made of composite materials are widely used in order to meet the above requirements and to be economical. The above-mentioned clad material is composed of a composite material made of stainless steel or Ni-based alloy steel with good corrosion resistance and acid resistance on the inner surface, and a base material made of carbon steel or low alloy steel with good strength and toughness on the outer surface. After being formed and processed into so-called clad steel pipes, they are used as products. When manufacturing large diameter pipes using the above-mentioned clad steel pipes, the cladding material is formed by a known roll forming method or UOE method, and then the ends of the cladding material are vertically seam welded to form a product. In the vertical seam welding process, the composite material and the base metal are welded, but when the base material is welded, the weld metal of the base material comes into contact with the composite material, and if a part of the composite material melts, Elements that make up stainless steel, etc.
Cr, Ni, etc. penetrate into the welded metal parts of the base metal and become concentrated.
Changes the composition of the composite material and causes material deterioration. As one method for preventing this, as shown in FIG. 2, Japanese Patent Laid-Open No. 154875/1983 discloses a method of widening the opening width 1e of the groove of the composite material 1b. FIG. 2 shows the method disclosed in Japanese Unexamined Patent Publication No. 60-154875, and shows a cross section perpendicular to the longitudinal seam in the axial direction of the clad steel pipe. When welding vertical seams, base material 1 of clad steel pipe 1
In a, openings 1 are provided on the surface of the base material 1a that is not in contact with the composite material 1b, that is, on the outside, and on the composite material 1b side, that is, on the inside.
c, 1d and a root surface at approximately the center in the thickness direction of the base material 1a, and the composite material 1b has an opening 1d on the composite material 1b side provided in the base material 1a. When welding the opening 1d of the base material 1a, the opening 1e has a width that is wider than the width of the opening 1d of the base material 1a so that the weld metal does not come into contact with the opening 1e.
Next, after welding the outer openings 1c of the base material 1a on both sides by submerged arc welding, etc., the openings 1e of the composite material 1b are welded.
This is a method of welding using TIG welding method etc. The welding materials used in the above welding are generally
For the base material 1a, a welding material with the same composition as the base material 1a is used, and for the composite material 1b, a welding material with a high alloy component equal to or higher than that of the composite material 1b is used. [Problems to be solved by the invention] Each of the openings 1c, 1d, 1e as described above
In vertical seam welding of clad steel pipe 1 using grooves, welding sequences, and welding materials having
When welding, the inner opening 1d and the outer opening 1c
If welding at least one layer each reduces work efficiency, or if a groove with the opening 1d is formed inside the base metal 1a, the weld metal in the opening 1d may be welded in such a way that the composite material 1b does not come into contact with the composite material 1b. It is necessary to widen the width of the opening 1e provided in 1b. Furthermore, if the width of the opening 1e of the composite material 1b is widened, the overlay volume increases, resulting in the use of more welding material and a decrease in welding efficiency, resulting in large economic losses. In addition to this, when welding the opening 1e of the composite material 1b,
Since the contact area with the base material 1a has increased, the composite material 1
The base metal 1a is melted by the welding heat input b, and the composite material 1b
Cr and Ni, which are the chemical components of the welding material, penetrate into the base metal 1a and become concentrated, increasing the dilution rate of the base material 1a.When selecting the welding material, consider the above and select a high alloy component that is higher than the chemical composition of the composite material 1b. In addition, if the width of the opening 1e of the composite material 1b exceeds 15 mm, the dilution rate of the base material 1a will be less than that of the composite material 1.
Although it depends on the welding method (b), it is 30% to 60%, and since it locally changes the composition of the base metal 1a, there is a problem of lowering the strength and toughness. This invention was made to solve the above-mentioned problems, and it is possible to improve the welding efficiency of the base material 1a and the composite material 1b, and to improve the welding efficiency of the base material 1a and the composite material 1b.
It is an object of the present invention to provide a method for vertical seam welding of steel pipes, etc. using a cladding material that provides superior metallurgical performance compared to conventional materials, even if the composition is close to that of the composition of item (b). [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a mutual cladding material in which carbon steel or low alloy steel is used as the base material and stainless steel or Ni-based alloy steel is used as the composite material. In the method of welding, there is I on the base metal side.
A Y-groove with a groove or an opening is provided, and a groove with an opening with a width of 15 mm to 5 mm is provided on the composite material side, and the base metal is first welded in one layer from the base metal side. After performing welding that produces back waves, the composite material is welded. [Function] The welding method for clad materials of the present invention narrows the opening, that is, the groove portion, of the composite material by welding the base metal in one layer from the outside on the opposite side to the composite material, and by performing welding that produces back waves. Therefore, the amount of welding material used when welding the composite material can be reduced, and the dilution rate of the base metal by the deposited metal can be lowered. [Embodiments of the Invention] Examples of the present invention will be described below with reference to FIG. FIG. 1 is a schematic diagram showing the state of implementation of the present invention step by step, and shows a sectional view of a vertical seam welded portion of a clad steel pipe 1 orthogonal to the vertical seam. In FIG. 1a, a clad steel pipe 1 is made of a base material 1a of carbon steel or low alloy steel on the outside and a composite material 1b of stainless steel or Ni-based alloy steel on the inside. When the base metal 1a has a thick plate thickness t1 , the welded part of the base metal has a depth d and an angle θ smaller than the base metal 1a thickness t1 to ensure welding and welding. A groove 2 is provided, which includes an opening 2a formed by a groove 1 , and root surfaces 2b, 2b. When the plate thickness t 1 of the base material 1a is a thin plate, the opening 2a does not need to be provided in the groove 2 because welding and undercoating can be performed reliably at the welded portion. Note that the distance l between the root surfaces 2b and 2b is 0 to
It is set to 1.5mm. The welded portion of the composite material 1a is provided with a groove 3 having an opening 3a with an interval B that does not touch the root surfaces 2b, 2b of the groove 2. Note that the composite material 1b forming the opening 3a of the groove 3 is
In order to improve weldability, the end face of
is set not to exceed 15 mm in order to reduce the dilution rate of the base material 1a. The minimum distance B is preferably the width of the back wave (approximately 5 mm) of the welded portion of the base material 1a. Vertical seam welding of the clad steel pipe 1 having the respective grooves 2 and 3 as described above is carried out in the following order by selecting a welding method and welding material that match the various conditions such as material and dimensions. First, as shown in Fig. 1b, the groove 2 of the base material 1a is welded from the opening 2a side with a larger thickness and a back wave, and welding 4 of the base material 1a is completed, and then the welding 4 of the base material 1a is completed, as shown in Fig. 1c. The groove 3 of the composite material 1b is welded in one or more layers to complete the welding 5 of the composite material 1b. Table 1 shows the conditions for producing an appropriate back wave when welding the base metal 1a by submerged arc welding, including the groove shape, number of electrodes, current, and
voltage and welding speed.
【表】
さらに上記第１表を母材板厚を10mm、電極数を
１極とした場合の例で詳述すると、母材の開先の
開口深さを３mm、電流を560A、電圧を32Vおよ
び溶接速度を120cpmとし、上記開先の開口側か
ら一層盛溶接すれば適正な裏波が得られることを
示すもので、溶接の際使用する溶接材料は母材と
ほぼ同等の化学成分を有するソリツドワイヤであ
る。
上記溶接条件下で得られる溶接４は、溶接割れ
等の溶接欠陥がなく、かつ適正な裏波が得られ
る。
なお上記母材１ａの溶接４の際、溶接金属がス
テンレス鋼等の合材１ｂにかからないようにする
のは、割れ防止などの観点から重要である。
上述のような溶接法で母材１ａを溶接した後、
合材１ｂの開先３を、合材１ｂの化学成分に近い
高合金の溶接材料を使用して溶接を行なうのであ
るが、その際合材１ｂの開先３の開口３ａは15mm
を超えないものとしているので、合材１ｂの溶着
金属と母材１ａとの接触面積が小さくなり、母材
１ａの希釈率は15％〜40％程度で済み、従来法が
30％〜60％程度の高率であるのに対して大巾に低
くすることができる。
上記のように母材１ａの希釈率が低いというこ
とは、合材１ｂおよびその溶接材料の構成元素で
あるCrやNi等の成分が母材１ａ側へ侵入濃化す
る割合が少ない事を示し、このことにより母材１
ａや合材１ｂの溶接部の冶金的性質を素材の性能
に近いものとすることができたり、合材１ｂの溶
接材料に含有されているCrやNi等の化学成分比
を押えたものとすることができるので、安価な溶
接材料で強度や耐食性等のすぐれた溶接ができ
る。
これに加え母材１ａの溶接４は一層盛であり、
合材１ｂの溶接に要する溶接材料を少なくするこ
とができ、溶接材料コストも低減でき、経済的効
果も大きい。
次に種々の材質のクラツド鋼管１を本発明方法
で溶接した場合の具体的な実施例について説明す
る。
（実施例 １）
次の第２表に示す化学成分を有する板厚14.5mm
でAPI−5L−X60の母材と板厚３mmでインコネル
825の合材とよりなる外径609.6mmで肉厚17.5mmの
クラツド鋼管について、その縦シーム溶接に本発
明方法を採用した。[Table] To further explain Table 1 above in detail using an example where the base material plate thickness is 10 mm and the number of electrodes is 1 pole, the opening depth of the base material groove is 3 mm, the current is 560 A, and the voltage is 32 V. This shows that an appropriate back wave can be obtained by setting the welding speed to 120 cpm and performing welding in one layer from the opening side of the groove, and the welding material used during welding has almost the same chemical composition as the base metal. It is a solid wire. The weld 4 obtained under the above welding conditions has no weld defects such as weld cracks, and a proper back wave can be obtained. Note that during welding 4 of the base metal 1a, it is important to prevent the weld metal from coming into contact with the composite material 1b, such as stainless steel, from the viewpoint of preventing cracking. After welding the base metal 1a using the welding method described above,
The groove 3 of the composite material 1b is welded using a high-alloy welding material that has a chemical composition similar to that of the composite material 1b. At this time, the opening 3a of the groove 3 of the composite material 1b is 15 mm.
Since the contact area between the welded metal of the composite material 1b and the base material 1a is small, the dilution rate of the base material 1a is only about 15% to 40%, which is different from the conventional method.
While the rate is high, around 30% to 60%, it can be significantly lower. As mentioned above, the low dilution rate of the base metal 1a indicates that the rate at which components such as Cr and Ni, which are the constituent elements of the composite material 1b and its welding material, penetrate into the base metal 1a side and become concentrated is small. , this makes the base material 1
It is possible to make the metallurgical properties of the welded parts of a and composite material 1b close to the performance of the materials, and to suppress the chemical component ratio of Cr, Ni, etc. contained in the welding material of composite material 1b. Therefore, it is possible to perform welding with excellent strength and corrosion resistance using inexpensive welding materials. In addition to this, the welding 4 of the base metal 1a is even thicker,
The amount of welding material required for welding the composite material 1b can be reduced, the cost of the welding material can also be reduced, and the economic effect is great. Next, specific examples will be described in which clad steel pipes 1 made of various materials are welded by the method of the present invention. (Example 1) A plate thickness of 14.5 mm having the chemical components shown in Table 2 below.
Inconel with base material of API-5L-X60 and plate thickness of 3 mm.
The method of the present invention was adopted for vertical seam welding of a clad steel pipe made of 825 composite material with an outer diameter of 609.6 mm and a wall thickness of 17.5 mm.
【表】
この時のそれぞれの開先形状を次の第３表、溶
接材料を第４表および溶接条件を第５表に示し、
第６表には上記諸条件で溶接した時の合材溶接部
の溶着金属の化学成分分析結果を示す。
なお比較のために前述の従来方法による縦シー
ム溶接の開先形状と溶接条件とを、第３表および
第５表に併記する。さらに第５表にはそれぞれの
溶接条件等で溶接した時の溶接部の溶接順序を付
したマクロの積層断面図も併記する。[Table] The groove shapes at this time are shown in Table 3 below, the welding materials are shown in Table 4, and the welding conditions are shown in Table 5.
Table 6 shows the chemical composition analysis results of the deposited metal in the composite welded parts when welded under the above conditions. For comparison, the groove shapes and welding conditions for vertical seam welding by the conventional method described above are also listed in Tables 3 and 5. Furthermore, Table 5 also includes macro cross-sectional views of the welds with the welding order of the welded parts when welded under the respective welding conditions.
【表】【table】
【表】【table】
【表】【table】
【表】
（実施例 ２）
次の第７表に示す化学成分を有する板厚９mmで
API−5L−X60の母材と板厚３mmでSUS316の合
材とよりなる外径508mmで板厚12mmのクラツド鋼
管について、その縦シーム溶接について本発明方
法を採用した。[Table] (Example 2) A plate with a thickness of 9 mm having the chemical components shown in Table 7 below.
The method of the present invention was adopted for vertical seam welding of a clad steel pipe with an outer diameter of 508 mm and a plate thickness of 12 mm, which is made of a base material of API-5L-X60 and a composite material of SUS316 with a plate thickness of 3 mm.
【表】
この時のそれぞれの開先形状を次の第８表、溶
接材料を第９表および溶接条件を第10表に示し、
第11表には上記諸条件で溶接した時の合材溶接部
の溶接金属の化学成分分析結果を示す。
なお比較のために前述の従来方法による縦シー
ム溶接の開先形状と溶接条件とを、第８表および
第10表に併記する。さらに第10表にはそれぞれの
溶接条件等で溶接した時の溶接部の溶接順序を付
したマクロの積層断面図も併記する。[Table] The groove shapes at this time are shown in Table 8 below, the welding materials are shown in Table 9, and the welding conditions are shown in Table 10.
Table 11 shows the chemical composition analysis results of the weld metal of the composite welded joint when welded under the above conditions. For comparison, the groove shapes and welding conditions for vertical seam welding by the conventional method described above are also listed in Tables 8 and 10. Furthermore, Table 10 also includes macro laminated cross-sectional views with the welding order of the welded parts when welded under each welding condition.
【表】【table】
【表】【table】
【表】【table】
【表】
（実施例 ３）
次の第12表に示す化学成分を有する板厚19.2mm
でAPI−5L−X60の母材と板厚３mmでJIS
329J2Lの合材とよりなる外径558.8mmで板厚22.2
mmのクラツド鋼管についてその縦シーム溶接につ
いて本発明方法を採用した。[Table] (Example 3) Plate thickness 19.2mm having the chemical composition shown in the following Table 12
JIS with API-5L-X60 base material and plate thickness 3mm.
Made of 329J2L composite material, outer diameter 558.8mm and plate thickness 22.2
The method of the present invention was adopted for longitudinal seam welding of mm clad steel pipes.
【表】
この時のそれぞれの開先形状を次の第13表、溶
接材料を第14表および溶接条件を第15表に示し、
第16表には上記諸条件で溶接した時の、合材溶接
部の溶着金属の化学成分分析結果を示す。
なお比較のために前述の従来方法による縦シー
ム溶接の開先形状と溶接条件とを、第13表および
第15表に併記する。さらに第15表にはそれぞれの
溶接条件等で溶接した時の溶接部の溶接順序を付
したマクロの積層断面図も併記する。[Table] The groove shapes at this time are shown in Table 13 below, the welding materials are shown in Table 14, and the welding conditions are shown in Table 15.
Table 16 shows the chemical composition analysis results of the weld metal in the welded composite material when welded under the above conditions. For comparison, the groove shapes and welding conditions of vertical seam welding by the conventional method described above are also listed in Tables 13 and 15. Furthermore, Table 15 also includes macro laminated cross-sectional views with the welding order of the welded parts when welded under each welding condition.
【表】【table】
【表】【table】
【表】【table】
以上のような構成よりなる本発明のクラツド材
の溶接方法によれば、次のような効果が得られ
る。
合材の溶接に際し、合材の開先の開口幅を15
mm〜５mmとし母材との接触面積を小さくしてい
るので、合材の溶接による母材への入熱低減が
計れる。
上記入熱低減が計れることにより、母材の希
釈率が低下し、合材の溶接材料のCrやNi等に
化学成分をむやみに高める必要がないととも
に、上記CrやNi等が母材に侵入濃化し母材の
機械的性能を大幅に低減させることがない。
さらに合材の溶接部の溶着金属に含有される
CrやNi等の含有量比率を上げることができる
ので上記溶接部の耐食性等の向上が計れる。
母材の溶接を、片面一層盛りでかつ裏波の出
る開先形状と溶接方法としているので、溶接時
のスラグ差込みが減少し溶接部の欠陥を減少で
きる。
これに加え、合材溶接部の開先の開口も小さ
くしているので、縦シーム溶接時の作業能率を
向上させることができる。
以上のような効果が得られ、クラツド材や、ク
ラツド鋼管の縦シーム溶接を健全で効率良く、さ
らに溶接部の冶金的性能を向上させることができ
るので、工業的にその効果の大き発明である。
According to the clad material welding method of the present invention having the above configuration, the following effects can be obtained. When welding the composite material, set the opening width of the groove of the composite material to 15
Since the contact area with the base metal is reduced to 5 mm to 5 mm, it is possible to reduce heat input to the base metal when welding composite materials. By reducing the heat input mentioned above, the dilution rate of the base metal is reduced, and there is no need to unnecessarily increase the chemical components of Cr, Ni, etc. in the composite welding material, and the above-mentioned Cr, Ni, etc. enter the base metal It will not thicken and significantly reduce the mechanical performance of the base material. Furthermore, it is contained in the weld metal of the welded part of the composite material.
Since the content ratio of Cr, Ni, etc. can be increased, it is possible to improve the corrosion resistance of the welded part. Since the base metal is welded with a single layer on one side and a groove shape that produces back waves, the insertion of slag during welding is reduced and defects in the welded part can be reduced. In addition to this, the opening of the groove in the composite welded part is also made smaller, so it is possible to improve work efficiency during vertical seam welding. The above-mentioned effects can be obtained, and the vertical seam welding of clad materials and clad steel pipes can be performed soundly and efficiently, and the metallurgical performance of the welded part can also be improved, making it an invention with great industrial effects. .
第１図は本発明の実施状態を工程別に示す模式
図、第２図は従来技術の説明図である。
１……クラツド鋼管、１ａ……母材、１ｂ……
合材、２……母材開先、２ａ……母材開先の開
口、３……合材開先、３ａ……合材開先の開口、
４……母材の溶接、５……合材の溶接。
FIG. 1 is a schematic diagram showing the implementation state of the present invention step by step, and FIG. 2 is an explanatory diagram of the prior art. 1... Clad steel pipe, 1a... Base metal, 1b...
Compound material, 2...Base metal groove, 2a...Opening in base material groove, 3...Mixture groove, 3a...Opening in compound groove,
4... Welding of base metal, 5... Welding of composite material.
Claims (1)
レス鋼あるいはNi基合金鋼を合材とするクラツ
ド材相互を溶接する方法において、母材側にはＩ
開先あるいは開口部を有したＹ開先を設けるとと
もに、合材側には幅が15mm〜５mmの開口部を有し
た開先を設け、まず母材の溶接を母材側から１層
でかつ裏波が出る溶接をしたのち、合材を溶接す
ることを特徴とするクラツド材の溶接方法。1 In a method of welding clad materials with carbon steel or low-alloy steel as the base material and stainless steel or Ni-based alloy steel as the composite material, there is no I on the base metal side.
A Y-groove with a groove or an opening is provided, and a groove with an opening with a width of 15 mm to 5 mm is provided on the composite material side, and the base metal is first welded in one layer from the base metal side. A method of welding clad materials, which is characterized by welding composite materials after welding that produces back waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18731387A JPS6431577A (en) | 1987-07-27 | 1987-07-27 | Welding method for clad material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18731387A JPS6431577A (en) | 1987-07-27 | 1987-07-27 | Welding method for clad material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6431577A JPS6431577A (en) | 1989-02-01 |
| JPH0453626B2 true JPH0453626B2 (en) | 1992-08-27 |
Family
ID=16203815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18731387A Granted JPS6431577A (en) | 1987-07-27 | 1987-07-27 | Welding method for clad material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6431577A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5454723B2 (en) | 2012-04-25 | 2014-03-26 | Ｊｆｅスチール株式会社 | Laminated stainless steel clad sheet excellent in seawater corrosion resistance, stainless clad steel sheet using the same, and method for producing the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5874297A (en) * | 1981-10-29 | 1983-05-04 | Ishikawajima Harima Heavy Ind Co Ltd | Welding method for clad steel materials |
| JPS61202782A (en) * | 1985-03-06 | 1986-09-08 | Sumitomo Metal Ind Ltd | Welding method for clad material |
-
1987
- 1987-07-27 JP JP18731387A patent/JPS6431577A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6431577A (en) | 1989-02-01 |
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