WO2016208131A1 - 両側サブマージアーク溶接方法 - Google Patents
両側サブマージアーク溶接方法 Download PDFInfo
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- WO2016208131A1 WO2016208131A1 PCT/JP2016/002703 JP2016002703W WO2016208131A1 WO 2016208131 A1 WO2016208131 A1 WO 2016208131A1 JP 2016002703 W JP2016002703 W JP 2016002703W WO 2016208131 A1 WO2016208131 A1 WO 2016208131A1
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- 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
- B23K9/00—Arc welding or cutting
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
Definitions
- the present invention relates to a double side submerged arc welding method.
- butt welding horizontal welding
- welding is performed at one bottom of two grooves opened in one and the other in the thickness direction, and then the bottom of the other groove is gouged.
- Patent Document 1 discloses a welding method in which a leading electrode and a trailing electrode are arranged on both sides of a base material, and the distance between the leading electrodes is 0 to 50 mm.
- both the base material and the welding material (wire) are mild steel, and shield gas is used during welding.
- a Ni steel plate having excellent low temperature toughness may be used for the side wall. Since the low-temperature tank is huge, butt welding of Ni steel plates arranged in the upper and lower sides needs to be performed outdoors. Also, the welding work place is often a high place. From such a point of view, it is desirable to use a double-sided submerged arc welding method that does not use shield gas and welds from both sides while covering the ends with a flux, as a method of butt-welding Ni steel sheets arranged vertically.
- LNG liquefied natural gas
- LPG liquefied petroleum gas
- the inventors of the present invention have a sufficiently high joint strength when the base material is thick when using a dissimilar joint with a different base material (Ni steel plate) and welding material (wire) as described above. Although it can be obtained, it has been found that the joint strength decreases when the base material is thin.
- an object of the present invention is to provide a double-sided submerged arc welding method capable of obtaining a sufficiently high joint strength even when the Ni steel plates to be abutted are thin.
- the inventors of the present invention have found that the decrease in joint strength when the thickness of the base metal is small in the dissimilar joint is the amount of penetration of the base material into the weld ( We found out that this was caused by an increase in the dilution ratio. And it discovered that a dilution rate could be restrained low if the front-end
- the present invention has been made from such a viewpoint.
- the double-sided submerged arc welding method of the present invention is a double-sided submerged arc welding method of welding from both sides while covering ends of Ni steel plates arranged vertically with a flux, wherein the first wire and the second wire made of a Ni-based alloy are used.
- a wire is used as an electrode, and a first torch that feeds the first wire toward a joining region where the ends are close to each other is moved along the joining region, and the second wire is moved from the opposite side of the first torch. Moving the second torch extending toward the joining region along the joining region while keeping the tip of the second wire behind the tip of the first wire by a predetermined distance of 10 mm or more and 60 mm or less. It is characterized by.
- tip of a 2nd wire is arrange
- the tip of the second wire is not separated beyond 60 mm from the tip of the first wire, it is possible to suppress defects such as poor penetration in the welded portion.
- At least one of the end portions is formed with a root face that is pointed toward the other and has inclined surfaces on both sides in the thickness direction of the Ni steel plate, and the tip of the root face is at the center of the Ni steel plate. On the other hand, it may be located on the first wire side or the second wire side. When the tip of the root face is located at the center of the Ni steel plate, the upper Ni steel plate may fall to the second wire side by welding. On the other hand, if the tip of the root face is located on the first wire side or the second wire side with respect to the center of the Ni steel plate as in the above configuration, the upper Ni steel plate is prevented from falling. Can do.
- the thickness of the Ni steel plate may be 20 mm or less.
- a belt may be disposed on both sides of the lower Ni steel plate so as to contact the Ni steel plate, and the flux may be deposited on the belt so as to cover the joining region. According to this configuration, the flux accumulation position can be easily changed in accordance with the welding position.
- FIG. 3 is a view showing joint structures of Examples 1 to 4 and Comparative Examples 1 and 2.
- This double-sided submerged arc welding method involves butt welding (lateral welding) of Ni steel plates 1 arranged vertically. Specifically, welding is performed from both sides while covering the upper end portion of the lower Ni steel plate 1 and the lower end portion of the upper Ni steel plate 1 with the flux 5.
- the first wire 21 and the second wire 22 used as electrodes are arranged on both sides of the joining region 15 (so-called welding line) where the ends of the Ni steel plate 1 are close to each other.
- the first wire 21 is for performing welding in advance on one side
- the second wire 22 is for performing welding on the opposite side with a slight delay.
- the first wire 21 is drawn out by the first torch 31 toward the bonding region
- the second wire 22 is drawn out by the second torch 32 toward the bonding region 15 from the side opposite to the first torch 31.
- Ni steel plate 1 as a base material and the first and second wires 21 and 22 as welding materials will be described.
- the Ni steel plate 1 is an iron alloy containing Ni (nickel) as a main additive.
- additives other than nickel in the iron alloy include C (carbon), Si (silicon), and Mn (manganese) (for example, see Japanese Industrial Standards JIS G 3127).
- the nickel content of the Ni steel sheet 1 is 3% or more and 15% or less in mass percent.
- the Ni steel sheet 1 typically has a ferrite structure.
- the both-side submerged arc welding method of the present embodiment can be used even when the Ni steel plate 1 is thick, but if the Ni steel plate 1 is thin (for example, when the thickness of the Ni steel plate 1 is 20 mm or less), The effect that the fall of the intensity
- board thickness of the Ni steel plate 1 may be 18 mm or less, and may be 16 mm or less.
- the upper end of the lower Ni steel plate 1 is flat, but the thickness of the Ni steel plate 1 sharpened toward the upper end of the lower Ni steel plate 1 at the lower end of the upper Ni steel plate 1.
- a root face 12 having inclined surfaces on both sides in the direction is formed. Thereby, between the edge parts of the Ni steel plate 1, the two groove
- the root face 12 may also be formed at the upper end of the lower Ni steel plate. Or the root face 12 may be formed only in the upper end part of the lower Ni steel plate.
- the root gap between the ends of the Ni steel plate 1 is, for example, 1 to 3 mm.
- the flat tip 13 of the root face 12 is located at the center CL of the Ni steel plate 1.
- the tip 13 of the root face 12 may be located on the second wire 22 side with respect to the center CL of the Ni steel plate 1.
- the upper Ni steel plate 1 may fall down to the second wire 22 side that is followed by welding.
- the tip 13 of the root face 12 is positioned on the second wire 22 side with respect to the center CL of the Ni steel plate 1 as shown in FIG. can do. This effect can be similarly obtained even when the tip of the root face is located on the first wire 21 side with respect to the center CL of the Ni steel plate 1.
- the root face 12 may have only one inclined surface so that the flat tip 13 of the root face 12 is located on one surface side of the Ni steel plate 1.
- the first wire 21 and the second wire 22 are made of a Ni-based alloy having higher toughness than the Ni steel plate 1.
- a Ni-based alloy contains 55% or more of Ni by mass percentage.
- Components other than Ni in the Ni-based alloy include, for example, Cu (copper), Cr (chromium), Fe (iron), Mo (molybdenum), and the like.
- Ni-based alloys typically have an austenite structure.
- the diameters of the first and second wires 21 and 22 are, for example, 1.0 to 3.2 mm.
- any wire that conforms to Japanese Industrial Standards JIS G 3333 YS9Ni can be used as the first and second wires 21 and 22.
- the flux 5 for example, any flux that conforms to Japanese Industrial Standards JIS G 3333 FS9Ni-H can be used.
- the belt 4 is arranged on both sides of the lower Ni steel plate 1 so as to be in contact with the Ni steel plate 1.
- This belt 4 is a part of an unillustrated flux supply device.
- the flux 5 that is powder is deposited on the belt 4 so as to cover the joining region 15 from both sides, in other words, so that the flux 5 is filled in both the grooves 11.
- the first torch 31 and the second torch 32 are arranged such that the first wire 21 is inserted into one groove 11 and the second wire 22 is inserted into the other groove 11. .
- the first torch 31 and the second torch 32 are arranged so that the first wire 31 is located in front of the welding direction and the second wire 32 is located behind in the welding direction. .
- the distal end of the second wire 32 is located behind the distal end of the first wire 31 by a predetermined distance L.
- the predetermined distance L is preferably 10 mm or more and 60 mm or less. This is because the joint strength decreases if the predetermined distance L becomes too small or too large.
- the predetermined distance L is more preferably 15 mm or more, and further preferably 20 mm or more.
- the predetermined distance L is more preferably 50 mm or less, and further preferably 40 mm or less.
- the first torch 31 is moved along the joining region 15, and the second torch 32 is moved to the tip of the second wire 22. It moves along the joining area
- the first layer 61 is formed at the bottom of both the grooves 11.
- the second layer 62 is formed in the same manner. If the inside of the groove 11 is filled only with the first layer 61, the formation of the second layer 62 is unnecessary.
- the voltage applied to each of the first wire 21 and the second wire 22 may be an AC voltage, but is preferably a DC voltage.
- the voltage value is, for example, 20 to 40 V
- the current value is, for example, 200 to 400 A.
- the moving speed of the first and second torches 31 and 32 is, for example, 20 to 70 cm / min.
- the tip of the second wire 22 is disposed 10 mm or more rearward from the tip of the first wire 21, so that compared to the case where they are disposed at the same position.
- the range of high temperature at the end of the Ni steel sheet 1 is narrowed. Therefore, the amount of penetration of the Ni steel sheet 1 into the welded portion is reduced, and the dilution rate can be kept low. Thereby, a sufficiently high joint strength can be obtained.
- the tip of the second wire 22 is not separated from the tip of the first wire 21 by more than 60 mm, defects such as poor penetration in the welded portion can be suppressed.
- the deposition position of the flux 5 can be easily changed according to the welding position.
- Example 1 a 9% Ni steel plate having a width of 500 mm, a height of 200 mm, and a thickness of 12 mm, which conforms to Japanese Industrial Standard JIS G 3127 SL9N590, was prepared as two Ni steel plates arranged one above the other.
- the upper end of the lower Ni steel plate was flat, and a root face having a flat center of 2 mm and inclined at 45 degrees on both sides was formed at the lower end of the upper Ni steel plate as shown in FIG.
- the root gap was 2 mm.
- the predetermined distance L between the tip of the first wire and the tip of the second wire was 40 mm, and welding was performed by applying a DC voltage of voltage 28V and current 360A to the first and second wires. The first and second torches were moved at 40 cm / min. Thereby, the joint structure 7 as shown in FIG. 4 was obtained.
- Example 2 a 9% Ni steel plate having a width of 1500 mm, a height of 150 mm, and a plate thickness of 9.6 mm was prepared as two Ni steel plates arranged vertically. At the upper end of the lower Ni steel plate, a root face having a flat surface of 2 mm on one side of the first wire and an inclination of 15 degrees on the center and the other surface side was formed. On the upper end portion of the upper Ni steel plate, a root face having a flat surface of 2 mm on the first wire side and an inclination of 40 degrees on the center and the other surface side was formed. That is, only one groove opened at an angle of 55 degrees from one surface side to the other surface side was formed between the ends of the Ni steel plates.
- Lincoln Techalloy® 276 having a diameter of 1.6 mm was prepared, and Lincoln P2007 was prepared as a flux.
- the predetermined distance L between the tip of the first wire and the tip of the second wire was 25 mm, and welding was performed by applying a DC voltage of 28 V and 300 A to the first and second wires. The first and second torches were moved at 35 cm / min. Thereby, the joint structure 7 as shown in FIG. 4 was obtained.
- Example 3 a 9% Ni steel plate having a width of 500 mm, a height of 200 mm, and a thickness of 12 mm, which conforms to Japanese Industrial Standard JIS G 3127 SL9N590, was prepared as two Ni steel plates arranged one above the other.
- the upper end of the lower Ni steel plate was flat, and a root face having a flat center of 2 mm and inclined at 45 degrees on both sides was formed at the lower end of the upper Ni steel plate as shown in FIG.
- the root gap was 2 mm.
- the predetermined distance L between the tip of the first wire and the tip of the second wire was 30 mm, and welding was performed by applying a DC voltage of 29V and 300A to the first and second wires. The first and second torches were moved at 40 cm / min. Thereby, the joint structure 7 as shown in FIG. 4 was obtained.
- Example 4 A joint structure 7 was obtained in the same manner as in Example 3 except that the predetermined distance L between the tip of the first wire and the tip of the second wire was 50 mm.
- Example 2 A joint structure 7 was obtained in the same manner as in Example 3 except that the predetermined distance L between the tip of the first wire and the tip of the second wire was 80 mm.
- Tables 1 and 2 show the manufacturing conditions and tensile strength of the joint structures 7 of Examples 1 to 4 and Comparative Examples 1 and 2.
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Abstract
Description
まず、上下に並べられる2枚のNi鋼板として、日本工業規格 JIS G 3127 SL9N590を準拠する、幅500mm、高さ200mm、板厚12mmの9%Ni鋼板を用意した。下側のNi鋼板の上端部はフラットとし、上側のNi鋼板の下端部に、図1に示すように、中央2mmがフラットで両側が45度傾斜するルートフェイスを形成した。ルートギャップは2mmとした。
まず、上下に並べられる2枚のNi鋼板として、米国試験材料協会規格 ASTM A553を準拠する、幅1500mm、高さ150mm、板厚9.6mmの9%Ni鋼板を用意した。下側のNi鋼板の上端部に、第1ワイヤ側の一面側2mmがフラットで、中央および他面側が15度傾斜のルートフェイスを形成した。上側のNi鋼板の上端部に、第1ワイヤ側の一面側2mmがフラットで、中央および他面側が40度傾斜のルートフェイスを形成した。すなわち、Ni鋼板の端部同士の間に、一面側から他面側に向かって角度55度で開く1つの開先のみを形成した。
まず、上下に並べられる2枚のNi鋼板として、日本工業規格 JIS G 3127 SL9N590を準拠する、幅500mm、高さ200mm、板厚12mmの9%Ni鋼板を用意した。下側のNi鋼板の上端部はフラットとし、上側のNi鋼板の下端部に、図1に示すように、中央2mmがフラットで両側が45度傾斜するルートフェイスを形成した。ルートギャップは2mmとした。
第1ワイヤの先端と第2ワイヤの先端との間の所定距離Lを50mmとした以外は、実施例3と同様にして継手構造7を得た。
第1ワイヤの先端と第2ワイヤの先端とを同じ位置とした(すなわち、所定距離L=0mm)以外は、実施例1と同様にして継手構造7を得た。
第1ワイヤの先端と第2ワイヤの先端との間の所定距離Lを80mmとした以外は、実施例3と同様にして継手構造7を得た。
図4に示すように、実施例1~4および比較例1,2の継手構造7から、溶接方向と直交する方向に延びる短冊状の2つのサンプル71を切り出し、これらのサンプル71に対して引張試験を行った。引張試験では、各サンプル71を長手方向に引っ張り、各サンプル71の溶接部が破断したときの応力を引張強さとして測定した。なお、Ni鋼板自体の引張強さは、750MPa程度である。
12 ルートフェイス
13 先端
15 接合領域
21 第1ワイヤ
22 第2ワイヤ
31 第1トーチ
32 第2トーチ
4 ベルト
5 フラックス
Claims (4)
- 上下に並ぶNi鋼板の端部同士をフラックスで覆いながら両側から溶接する両側サブマージアーク溶接方法であって、
Ni基合金からなる第1ワイヤおよび第2ワイヤを電極として用い、
前記第1ワイヤを前記端部同士が近接する接合領域に向けて繰り出す第1トーチを前記接合領域に沿って移動させるとともに、前記第1トーチと反対側から前記第2ワイヤを前記接合領域に向けて繰り出す第2トーチを、前記第2ワイヤの先端を前記第1ワイヤの先端から10mm以上60mm以下の所定距離だけ後方に保ちながら、前記接合領域に沿って移動させる、両側サブマージアーク溶接方法。 - 前記端部の少なくとも一方には、他方に向かって尖る、前記Ni鋼板の板厚方向の両側に傾斜面を有するルートフェイスが形成されており、前記ルートフェイスの先端は、前記Ni鋼板の中心に対して前記第1ワイヤ側または前記第2ワイヤ側に位置している、請求項1に記載の両側サブマージアーク溶接方法。
- 前記Ni鋼板の板厚は20mm以下である、請求項1または2に記載の両側サブマージアーク溶接方法。
- 下側の前記Ni鋼板の両側に前記Ni鋼板に接するようにベルトを配置し、このベルト上に、前記接合領域を覆い隠すように前記フラックスを堆積させる、請求項1~3のいずれか一項に記載の両側サブマージアーク溶接方法。
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JP2017524592A JP6576448B2 (ja) | 2015-06-22 | 2016-06-03 | 両側サブマージアーク溶接方法 |
AU2016282010A AU2016282010B2 (en) | 2015-06-22 | 2016-06-03 | Double-side submerged arc welding method |
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AU (1) | AU2016282010B2 (ja) |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210162538A1 (en) * | 2017-08-24 | 2021-06-03 | Ihi Inspection & Instrumentation Co., Ltd. | Hybrid welding method and hybrid welding apparatus |
CN114762907A (zh) * | 2021-01-13 | 2022-07-19 | 宝山钢铁股份有限公司 | 用于动载场合的厚壁高强钢双面埋弧焊接方法 |
JP7441126B2 (ja) | 2020-06-12 | 2024-02-29 | 川崎重工業株式会社 | 両側サブマージアーク溶接装置及び方法 |
Families Citing this family (2)
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JP7448433B2 (ja) * | 2019-09-12 | 2024-03-12 | 株式会社神戸製鋼所 | サブマージアーク溶接用フラックス、サブマージアーク溶接方法、及びサブマージアーク溶接用フラックスの製造方法 |
CN114571080B (zh) * | 2022-04-14 | 2024-03-22 | 常州世竟液态金属有限公司 | 块体非晶合金用斜角双面激光焊接方法及板材 |
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- 2016-06-03 AU AU2016282010A patent/AU2016282010B2/en active Active
- 2016-06-03 WO PCT/JP2016/002703 patent/WO2016208131A1/ja active Application Filing
- 2016-06-03 JP JP2017524592A patent/JP6576448B2/ja active Active
- 2016-06-14 TW TW105118551A patent/TWI629134B/zh active
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20210162538A1 (en) * | 2017-08-24 | 2021-06-03 | Ihi Inspection & Instrumentation Co., Ltd. | Hybrid welding method and hybrid welding apparatus |
JP7441126B2 (ja) | 2020-06-12 | 2024-02-29 | 川崎重工業株式会社 | 両側サブマージアーク溶接装置及び方法 |
CN114762907A (zh) * | 2021-01-13 | 2022-07-19 | 宝山钢铁股份有限公司 | 用于动载场合的厚壁高强钢双面埋弧焊接方法 |
CN114762907B (zh) * | 2021-01-13 | 2024-05-14 | 宝山钢铁股份有限公司 | 用于动载场合的厚壁高强钢双面埋弧焊接方法 |
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TW201707820A (zh) | 2017-03-01 |
JPWO2016208131A1 (ja) | 2018-04-05 |
JP6576448B2 (ja) | 2019-09-18 |
TWI629134B (zh) | 2018-07-11 |
AU2016282010B2 (en) | 2018-12-06 |
AU2016282010A1 (en) | 2018-02-15 |
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