AU2016282010B2 - Double-side submerged arc welding method - Google Patents
Double-side submerged arc welding method Download PDFInfo
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- AU2016282010B2 AU2016282010B2 AU2016282010A AU2016282010A AU2016282010B2 AU 2016282010 B2 AU2016282010 B2 AU 2016282010B2 AU 2016282010 A AU2016282010 A AU 2016282010A AU 2016282010 A AU2016282010 A AU 2016282010A AU 2016282010 B2 AU2016282010 B2 AU 2016282010B2
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- 238000003466 welding Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 96
- 239000010959 steel Substances 0.000 claims abstract description 96
- 230000004907 flux Effects 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 97
- 239000010953 base metal Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052759 nickel Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 239000012895 dilution Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A double-side submerged arc welding method for welding two end portions of vertically aligned Ni steel plates (1) from both sides while covering the end portions with flux (5), wherein, using a first wire (21) and a second wire (22) comprising a Ni-based alloy as electrodes, a first torch (31) from which the first wire (21) is extended toward a joint region where the two end portions come close to each other is moved along the joint region, and a second torch (32) from which the second wire (22) is extended toward the joint region from the opposite side to the first torch (31) is moved along the joint region (15) while the tip end of the second wire (22) is held behind the tip end of the first wire (21) by a specific distance of 10─60 mm.
Description
Description
Title of Invention: DOUBLE-SIDED SUBMERGED ARC WELDING METHOD Technical Field [0001] The present invention relates to a double-sided submerged arc welding method.
Background Art [0002] As a method of performing butt welding (horizontal welding) of steel plates arranged vertically (on an upper side and a lower side), for example, there is a method in which welding is firstly performed in the bottom of one of two grooves which open on one side and the other side in a plate thickness direction, then the bottom of the other groove is back-chipped by gouging, and then welding is performed in the bottom of the other groove. In contrast, to omit the back-chipping, there is a method in which the steel plates are double-sided welded simultaneously (welding of the steel plates is performed from both sides at the same time).
[0003] For example, Patent Literature 1 discloses a welding method in which a preceding electrode and a subsequent electrode are disposed on each of both sides of base metals (a preceding electrode and a subsequent electrode are disposed on one side of the base metals, and a preceding electrode and a subsequent electrode are disposed on the other side of the base metals), and a gap between the preceding electrodes on both sides is set to 0 to 50mm. In Example of the welding method disclosed in Patent Literature 1, the base metals and welding materials (wires) are soft steel, and a shield gas is used during the welding.
Citation List
Patent Literature [0004] Patent Literature 1: Japanese-Laid Open Patent Application Publication No. Sho. 61-206564
Summary of Invention
Technical Problem [0005] Regarding a low-temperature tank which stores therein a liquefied gas such as LNG (liquefied natural gas) or LPG (liquefied petroleum gas), Ni steel plates with high low-temperature toughness are sometimes used for side walls. The low-temperature tank is huge. Therefore, it is necessary to perform butt welding of the Ni steel plates arranged vertically in an outdoor place. Also, a welding work place is often situated at a high vertical level. In view of this, as a method of performing butt welding of the Ni steel plates arranged vertically in the outdoor place, a double-sided submerged arc welding method is desirably used, in which the Ni steel plates are welded from both sides while covering the end portions of the Ni steel plates with flux, without using the shield gas. [0006] In the outdoor place, it is difficult to perform a uniform welding work. To prevent reduction of performance of a joint as a welded portion, due to the non-uniformity of the welding work, wires made of Ni-based alloy with toughness higher than that of the Ni steel plates are effectively used as wires which become electrodes.
[0007] The inventors of the present invention found out that in a case where a different-material joint in which the base metals (Ni steel plates) are different from the welding materials (wires) is used as described above, joint strength is high in the case of the base metals which are thick, and is low in the case of the base metals which are thin. [0008] In view of the above, an object of the present invention is to provide a doublesided submerged arc welding method which can obtain sufficiently high joint strength, even in a case where Ni steel plates to be butted together are thin.
Solution to Problem [0009] To solve the above-described problem, the inventors of the present invention intensively studied, and found that reduction of the joint strength of the different-material joint in a case where the plate thickness of the base metals is small is caused by an increase in the amount (dilution rate) of welding penetration of the base metal into a welded portion. The present inventors discovered that by shifting the positions of the tip ends of the electrodes disposed on the both sides of the base metals, from each other, the dilution rate can be reduced. The present invention has been made based on this view.
[0010] According to the present invention, there is provided a double-sided submerged arc welding method in which welding of Ni steel plates arranged vertically is performed from both sides while covering end portions of the Ni steel plates with flux, the doublesided submerged arc welding method including: by use of a first wire and a second wire which are made of Ni-based alloy, as electrodes, moving a first torch which feeds the first wire toward a welding region where the end portions of the Ni steel plates are close to each other, along the welding region, and moving along the welding region, a second torch which feeds the second wire toward the welding region from a side opposite to a side where the first torch is located, while keeping a state in which a tip end of the second wire is located backward at a predetermined distance of 10mm or more and 60mm or less from a tip end of the first wire.
[0011] In accordance with this method, since the tip end of the second wire is located backward at a distance of 10mm or more from the tip end of the first wire, an area whose temperature is elevated, in the end portions of the Ni steel plates, is narrow, compared to a case where the tip end of the first wire and the tip end of the second wire are located at the same position. Therefore, the amount of welding penetration of the Ni steel plates into the welded portion can be reduced, and a dilution rate can be reduced. This makes it possible to obtain sufficiently high joint strength. Since the tip end of the second wire is kept within 60mm from the tip end of the first wire, defects such as insufficient welding penetration in the welded portion can be suppressed.
[0012] At least one of the end portions of the Ni steel plates may be formed with a root face which is pointed toward the other end portion and has inclined surfaces on both sides in a plate thickness direction of the Ni steel plates, and a tip end of the root face may be located closer to the first wire or the second wire than a center of the Ni steel plates. In a case where the tip end of the root face is located at the center of the Ni steel plates, the Ni steel plate located on an upper side (upper Ni steel plate) may sometimes tilt toward the second wire, due to the welding. In contrast, in a case where the tip end of the root face is located closer to the first wire or the second wire than the center of the Ni steel plates, like the above-described configuration, it becomes possible to suppress the upper Ni steel plate from tilting toward the second wire.
[0013] For example, the Ni steel plates may have a plate thickness of 20mm or less. [0014] Belts may be disposed on both sides of the Ni steel plate located on a lower side in such a manner that the belts are in contact with the Ni steel plate located on the lower side, and the flux may be deposited on the belts to cover the welding region. In accordance with this method, the position at which the flux is deposited can be easily changed depending on a welding position.
Advantageous Effects of Invention [0015] In accordance with the present invention, it becomes possible to obtain sufficiently high joint strength, even in a case where Ni steel plates to be butted together are thin.
Brief Description of Drawings [0016] Fig. 1 is a cross-sectional view for explaining a double-sided submerged arc welding method according to one embodiment of the present invention.
Fig. 2 is a plan view showing a positional relationship between a first torch and a second torch.
Fig. 3 is a cross-sectional view showing the shape of another root face.
Fig. 4 is a view showing a joint structure according to Examples 1 to 4 and
Comparative Examples 1, 2.
Description of Embodiments [0017] A double-sided submerged arc welding method according to one embodiment of the present invention will be described with reference to Figs. 1 and 2. In this doublesided submerged arc welding method, butt welding (horizontal welding) of Ni steel plates 1 arranged vertically is performed. Specifically, welding is performed from both sides while covering with flux 5, the upper end portion of the Ni steel plate 1 located on a lower side (lower Ni steel plate 1) and the lower end portion of the Ni steel plate 1 located on an upper side (upper Ni steel plate 1).
[0018] On both sides of a welding region 15 (namely, welding line) where the end portions of the Ni steel plates 1 are close to each other, a first wire 21 and a second wire 22 which are used as electrodes are disposed. The first wire 21 is used to perform welding precedingly on one side of the both sides. The second wire 22 is used to perform welding subsequently (there is a time lag between the welding performed by the first wire 21 and the welding performed by the second wire 22), on the other side which is opposite to a side where the first wire 21 is located. A first torch 31 feeds (sends out) the first wire 21 toward the welding region 15. A second torch 32 feeds the second wire 22 toward the welding region 15, from a side opposite to a side where first torch 31 is located.
[0019] Initially, the Ni steel plates 1 which are base metals and the first and second wires 21, 22 which are welding materials will be described.
[0020] The Ni steel plates 1 are made of iron (ferric) alloy containing Ni (nickel) as a major added substance. Added substances other than nickel contained in the iron alloy are, for example, C (carbon), Si (silicon), and Mn (manganese) (e.g., see Japanese Industrial Standard JIS G 3127). For example, the content of nickel in the Ni steel plates 1 is 3% or more and 15% or less in mass percentage. Among Ni steel plates, 7% Ni steel or 9% Ni steel is preferably used as the Ni steel plates 1, for a low-temperature tank for storing a liquefied gas. Typically, the Ni steel plates 1 have a ferrite structure.
[0021] The double-sided submerged arc welding method of the present embodiment can also be used for a case where the Ni steel plates 1 are thick. If the double-sided submerged arc welding method of the present embodiment is used for a case where the Ni steel plates 1 are thin (e.g., a case where the plate thickness of the Ni steel plates 1 is 20mm or less), reduction of strength of a joint as a welded region can be effectively prevented. Note that the plate thickness of the Ni steel plates 1 may be 18mm or less, or 16mm or less.
[0022] In the present embodiment, the upper end portion of the lower Ni steel plate 1 is flat. In contrast, the lower end portion of the upper Ni steel plate 1 has a root face 12 which is pointed toward the upper end portion of the lower Ni steel plate 1 and has inclined surfaces on both sides in the plate thickness direction of the Ni steel plates 1. In this structure, two grooves 11 which open on one side and the other side, respectively, in the plate thickness direction of the Ni steel plates 1, are formed between the end portions of the Ni steel plates 1. Alternatively, the root face 12 may also be formed in the upper end portion of the lower Ni steel plate. Further, the root face 12 may be formed only in the upper end portion of the lower Ni steel plate.
[0023] A root gap between the end portions of the Ni steel plates 1 is, for example, 1 to 3mm.
[0024] In the present embodiment, a flat tip end 13 of the root face 12 is located at a center CL of the Ni steel plates 1. Alternatively, as shown in Fig. 3, the tip end 13 of the root face 12 may be located closer to the second wire 22 than the center CL of the Ni steel plates 1. In a case where the tip end 13 of the root face 12 is located at the center CL of the Ni steel plates 1, the upper Ni steel plate 1 may sometimes tilt toward the second wire 22 with which the welding is performed subsequently, due to the welding. In contrast, in a case where the tip end 13 of the root face 12 is located closer to the second wire 22 than the center CL of the Ni steel plates 1, as shown in Fig. 3, it becomes possible to suppress the upper Ni steel plate 1 from tilting toward the second wire 22. This effect can be obtained in the same manner in a case where the tip end of the root face is located closer to the first wire 21 than the center CL of the Ni steel plates 1. In a further alternative, the root face 12 may have only one inclined surface in such a manner that the flat tip end 13 of the root face 12 is located on one side of one of the Ni steel plate 1.
[0025] The first wire 21 and the second wire 22 are made of Ni-based alloy with toughness higher than that of the Ni steel plates 1. For example, the Ni-based alloy used herein contains 55% or more Ni in mass percentage. Constituents (components) other than the Ni-based alloy are, for example, Cu (copper), Cr (chromium), Fe (iron), and Mo (molybdenum). The Ni-based alloy typically has an austenite structure. The diameter of each of the first and second wires 21, 22 is, for example, 1.0 to 3.2mm.
[0026] For example, in a case where the Ni steel plates 1 are 9% Ni steel, arbitrary wires according to JIS G 3333 YS9Ni may be used as the first and second wires 21, 22. In this case, for example, arbitrary flux according to JIS G 3333 FS9Ni-H may be used as the flux
5.
2016282010 22 Jan 2018 [0027] Next, the double-sided submerged arc welding method of the present embodiment will be described in detail.
[0028] Initially, belts 4 are disposed on the both sides of the lower Ni steel plate 1 in such a manner that the belts 4 are in contact with the lower Ni steel plate 1. The belts 4 are a part of a flux supplying device (not shown). Then, powdered flux 5 is deposited on the belts 4 in such a manner that the flux 5 covers the welding region 15 from the both sides, namely, the flux 5 is filled in both of the grooves 11.
[0029] Then, the first torch 31 and the second torch 32 are disposed in such a manner that the first wire 21 is inserted into one of the grooves 11 and the second wire 22 is inserted into the other groove 11. At this time, as shown in Fig. 2, the first torch 31 and the second torch 32 are disposed in such a manner that the first wire 21 is located forward in a welding direction and the second wire 22 is located backward in the welding direction. In other words, the tip end of the second wire 22 is located backward at a predetermined distance L from the tip end of the first wire 21.
[0030] Preferably, the predetermined distance L is 10mm or more and 60mm or less.
This is because joint strength is reduced if the predetermined distance L is increased or reduced excessively. More preferably, the predetermined distance L is 15mm or more. Most preferably, the predetermined distance L is 20mm or more. More preferably, the predetermined distance L may be 50mm or less. Most preferably, the predetermined distance L may be 40mm or less.
[0031] After that, the first torch 31 is moved along the welding region 15 while applying a voltage to each of the first wire 21 and the second wire 22. In addition, the second torch 32 is moved along the welding region 15 while keeping a state in which the tip end of the second wire 22 is located backward at the predetermined distance L from the tip end of the 25 first wire 21. In this way, first layers 61 are formed in the bottoms of the grooves 11, respectively. After forming the first layers 61, second layers 62 are formed in the same manner. Note that it is not necessary to form the second layers 62 in a case where the grooves 11 are filled with the first layers 61, respectively without the second layers 62. [0032] Although the voltage applied to each of the first wire 21 and the second wire 22 may be an AC voltage, the voltage is preferably a DC voltage. In the case of the DC voltage, a voltage value may be, for example, 20 to 40V, and a current value may be, for example, 200 to 400A. The movement speed of the first and second torches 31, 32 is, for example, 20 to 70cm/min.
[0033] As described above, in the double-sided submerged arc welding method of the present embodiment, since the tip end of the second wire 22 is located backward at a distance of 10mm or more from the tip end of the first wire 21, an area whose temperature is elevated, in the end portions of the Ni steel plates 1, is narrower than in a case where the tip end of the first wire 21 and the tip end of the second wire 22 are located at the same position. Therefore, the amount of welding penetration of the Ni steel plates 1 into the welding region can be reduced, and a dilution rate can be reduced. This makes it possible to obtain sufficiently high joint strength. Since the tip end of the second wire 22 is kept within 60mm from the tip end of the first wire 21, defects such as insufficient welding penetration in the welded portion can be suppressed.
[0034] In the present embodiment, since the flux 5 is deposited on the belts 4, the position at which the flux 5 is deposited can be easily changed depending on a welding position.
Examples [0035] Hereinafter, the present invention will be described in detail by use of Examples. Note that the present invention is not limited to the Examples described below.
[0036] (Example 1)
Initially, as two Ni steel plates arranged vertically, 9% Ni steel plates with a width 500mm, a height 200mm, and a plate thickness 12mm, according to Japanese Industrial Standard JIS G 3127 SL9N590 were prepared. The upper end portion of the lower Ni steel plate was flat. The lower end portion of the upper Ni steel plate was formed with a root face having a shape in which a center portion with 2mm was flat and surfaces on both sides were inclined 45 degrees, as shown in Fig. 1. The root gap was set to 2mm. [0037] As the first and second wires used as the electrodes, Kobe Steel, Ltd. product name US-709S with a diameter 2.4mm, according to JIS G 3333 YS9Ni was prepared. As the flux, Kobe Steel, Ltd. product name PF-N4, according to JIS G 3333 FS9Ni-H was prepared.
[0038] The welding was performed under the conditions in which the predetermined distance L between the tip end of the first wire and the tip end of the second wire was set to 40mm, and a DC voltage with a voltage 28V and a current 360A was applied to the first and second wires. The first and second torches were moved at 40cm/min. In this way, a joint structure 7 of Fig. 4 was obtained.
[0039] (Example 2)
Initially, as two Ni steel plates arranged vertically, 9% Ni steel plates with a width 1500mm, a height 150mm, and a plate thickness 9.6mm, according to Standard of
2016282010 22 Jan 2018
American Society for Testing and Materials ASTM A553 were prepared. The upper end portion of the lower Ni steel plate was formed with a root face having a shape in which a surface with 2mm on one side (first wire side) was flat, and a center portion and a surface on the other side were inclined 15 degrees. The lower end portion of the upper Ni steel plate was formed with a root face having a shape in which a surface with 2mm on one side (first wire side) was flat, and a center portion and a surface on the other side were inclined 40 degrees. In brief, only one groove which opens at an angle of 55 degrees from one side toward the other side was formed between the end portions of the Ni steel plates. [0040] As the first and second wires used as the electrodes, Lincoln Electric product name Techalloy 276 with a diameter 1,6mm was prepared. As the flux, Lincoln Electric product name P2007 was prepared.
[0041] The welding was performed under the conditions in which the predetermined distance L between the tip end of the first wire and the tip end of the second wire was set to 25mm, and a DC voltage with a voltage 28V and a current 300A was applied to the first and second wires. The first and second torches were moved at 35cm/min. In this way, the joint structure 7 of Fig. 4 was obtained.
[0042] (Example 3)
Initially, as two Ni steel plates arranged vertically, 9% Ni steel plates with a width 500mm, a height 200mm, and a plate thickness 12mm, according to JIS G 3127 SL9N590 were prepared. The upper end portion of the lower Ni steel plate was flat. The lower end portion of the upper Ni steel plate was formed with a root face having a shape in which a center portion with 2mm was flat and surfaces on both sides were inclined 45 degrees, as shown in Fig. 1. The root gap was set to 2mm.
[0043] As the first and second wires used as the electrodes, Kobe Steel, Ltd. product name US-709S with a diameter 2.4mm, according to JIS G 3333 YS9Ni was prepared.
As the flux, Kobe Steel, Ltd. product name PF-N4, according to JIS G 3333 FS9Ni-H was prepared.
[0044] The welding was performed under the conditions in which the predetermined distance L between the tip end of the first wire and the tip end of the second wire was set to
30mm, and a DC voltage with a voltage 29V and a current 300A was applied to the first and second wires. The first and second torches were moved at 40cm/min. In this way, the joint structure 7 of Fig. 4 was obtained.
[0045] (Example 4)
The joint structure 7 was obtained in the same manner as that for Example 3 except that the predetermined distance L between the tip end of the first wire and the tip end of the second wire was set to 50mm.
[0046] (Comparative Example 1)
The joint structure 7 was obtained in the same manner as that for Example 1 except that the tip end of the first wire and the tip end of the second wire were located at the same position (predetermined distance L = 0mm).
[0047] (Comparative Example 2)
The joint structure 7 was obtained in the same manner as that for Example 3 except that the predetermined distance L between the tip end of the first wire and the tip end of the second wire was set to 80mm.
[0048] (Tensile Test)
As shown in Fig. 4, two samples 71 with a rectangular shape extending in a direction perpendicular to a welding direction were cut out from each of the joint structures 7 according to Examples 1 to 4 and Comparative Examples 1, 2, and a tensile test was conducted for these samples 71. In the tensile test, each of the samples 71 was tensed in a lengthwise direction, and a stress in a state in which the welded portion of each of the samples 71 was fractured was measured as tensile strength. Note that the tensile stress of the Ni steel plates is about 750MPa.
[0049] Tables 1 and 2 show manufacturing conditions and tensile strength, respectively, of the joint structures 7 according to Examples 1 to 4 and Comparative Examples 1, 2.
[0050] [Table 1]
| Ni steel plate | Wire diameter (mm) | ||||
| Plate thickness (mm) | End portion shape | Root gap (mm) | |||
| Upper end portion of lower plate | Lower end portion of upper plate | ||||
| Example 1 | 12 | Flat | Center portion with 2mm: flat, surfaces on both sides inclined 45 degrees | 2 | 2.4 |
| Example 2 | 9.6 | Surface with 2mm on one side: flat, center portion and surface on the other side: inclined 15 degrees | Surface with 2mm on one side: flat, center portion and surface on the other side: inclined 40 degrees | 3 | 1.6 |
| Example 3 | 12 | Flat | Center portion with 2mm :flat, surfaces on both sides: inclined 45 degrees | 2 | 2.4 |
| Example 4 | 12 | Flat | Center portion with 2mm :flat, surfaces on both sides: inclined 45 degrees | 2 | 2.4 |
| Comparative Example 1 | 12 | Flat | Center portion with 2mm :flat, surfaces on both sides: inclined 45 degrees | 2 | 2.4 |
| Comparative Example 2 | 12 | Flat | Center portion with 2mm :flat, surfaces on both sides: inclined 45 degrees | 2 | 2.4 |
[0051] [Table 2]
| Distance L between tip ends of wires (mm) | Welding conditions | Tensile strength | ||||
| Voltage(V) | Current (A) | Speed (cm/min) | Sample 1 (MPa) | Sample 2 (MPa) | ||
| Example 1 | 40 | 28 | 360 | 40 | 759 | 751 |
| Example 2 | 25 | 28 | 300 | 35 | 708 | 697 |
| Example 3 | 30 | 29 | 300 | 40 | 706 | 708 |
| Example 4 | 50 | 29 | 300 | 40 | 757 | 725 |
| Comparative Example 1 | 0 | 28 | 360 | 40 | 596 | 599 |
| Comparative Example 2 | 80 | 29 | 300 | 40 | 642 | 677 |
[0052] As can be seen from Table 2, in Comparative Example 1 in which the tip end of the first wire and the tip end of the second wire were located at the same position, the tensile stress was lower than 600MPa, and the joint strength was low. In contrast, in Examples 1 to 4 in which the tip end of the second wire was located backward at a certain distance from the tip end of the first wire, the tensile stress was higher than 690MPa, and the joint strength was high. However, in Comparative Example 2 in which the tip end of the second wire was located backward at a great distance from the tip end of the first wire, the tensile stress was lower than 680MPa (the tensile stress of one of the samples was lower than 650MPa), and the joint strength was low.
Reference Signs List
| [0053] 1 | Ni steel plate |
| 12 | root face |
| 13 | tip end |
| 15 | welding region |
| 21 | first wire |
| 22 | second wire |
| 31 | first torch |
| 32 | second torch |
| 4 | belt |
| 5 | flux |
2016282010 22 Oct 2018
Claims
Claims (3)
1. A double-sided submerged arc welding method in which welding of Ni steel plates arranged vertically and having a plate thickness of 20mm or less is performed from both sides while covering end portions of the Ni steel plates with flux, the double-sided submerged arc welding method including:
by use of a first wire and a second wire which are made of Ni-based alloy, as electrodes, moving a first torch which feeds the first wire toward a welding region where the end portions of the Ni steel plates are close to each other, along the welding region, and moving along the welding region, a second torch which feeds the second wire toward the welding region from a side opposite to a side where the first torch is located, while keeping a state in which a tip end of the second wire is located backward at a predetermined distance of 10mm or more and 60mm or less from a tip end of the first wire.
2. The double-sided submerged arc welding method according to claim 1, wherein at least one of the end portions of the Ni steel plates is formed with a root face which is pointed toward the other end portion and has inclined surfaces on both sides in a plate thickness direction of the Ni steel plates, and wherein a tip end of the root face is located closer to the first wire or the second wire than a center of the Ni steel plates.
3. The double-sided submerged arc welding method according claim 1 or 2, wherein belts are disposed on both sides of the Ni steel plate located on a lower side in such a manner that the belts are in contact with the Ni steel plate located on the lower side, and the flux is deposited on the belts to cover the welding region.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015124430 | 2015-06-22 | ||
| JP2015-124430 | 2015-06-22 | ||
| PCT/JP2016/002703 WO2016208131A1 (en) | 2015-06-22 | 2016-06-03 | Double-side submerged arc welding method |
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| JP6722625B2 (en) * | 2017-08-24 | 2020-07-15 | 株式会社Ｉｈｉ検査計測 | Hybrid welding method and hybrid welding apparatus |
| JP7448433B2 (en) * | 2019-09-12 | 2024-03-12 | 株式会社神戸製鋼所 | Flux for submerged arc welding, submerged arc welding method, and method for producing flux for submerged arc welding |
| JP7441126B2 (en) | 2020-06-12 | 2024-02-29 | 川崎重工業株式会社 | Double-sided submerged arc welding equipment and method |
| CN114762907B (en) * | 2021-01-13 | 2024-05-14 | 宝山钢铁股份有限公司 | Double-sided submerged arc welding method for thick-wall high-strength steel in dynamic load occasion |
| CN114571080B (en) * | 2022-04-14 | 2024-03-22 | 常州世竟液态金属有限公司 | Oblique angle double-sided laser welding method for bulk amorphous alloy and plate |
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|---|---|---|---|---|
| JPS56158282A (en) * | 1980-05-12 | 1981-12-05 | Toyo Kanetsu Kk | Submerged arc welding of 9% ni steel |
| JPS61206563A (en) * | 1985-03-08 | 1986-09-12 | Nippon Steel Corp | Three o'clock welding method of steel material |
| JP2010221298A (en) * | 2009-02-27 | 2010-10-07 | Jfe Steel Corp | Complex method of welding in combination of gas shield arc welding with submerged arc welding, and complex welding machine thereof |
| JP2011167741A (en) * | 2010-02-22 | 2011-09-01 | Hitachi Zosen Corp | Automatic butt welding equipment for shear-cut steel sheet |
| JP2013198926A (en) * | 2012-03-26 | 2013-10-03 | Hitachi Zosen Corp | Submerged arc welding facility for thick plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB748531A (en) * | 1954-01-04 | 1956-05-02 | Chicago Bridge & Iron Co | Improvements in or relating to process of electric arc welding |
| JP4263317B2 (en) * | 1999-09-06 | 2009-05-13 | 文化シヤッター株式会社 | How to adjust the installation angle of structures |
| JP4998353B2 (en) * | 2008-03-31 | 2012-08-15 | Ｊｆｅスチール株式会社 | Manufacturing method of welded steel pipe |
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- 2016-06-03 JP JP2017524592A patent/JP6576448B2/en active Active
- 2016-06-03 AU AU2016282010A patent/AU2016282010B2/en active Active
- 2016-06-03 WO PCT/JP2016/002703 patent/WO2016208131A1/en active Application Filing
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56158282A (en) * | 1980-05-12 | 1981-12-05 | Toyo Kanetsu Kk | Submerged arc welding of 9% ni steel |
| JPS61206563A (en) * | 1985-03-08 | 1986-09-12 | Nippon Steel Corp | Three o'clock welding method of steel material |
| JP2010221298A (en) * | 2009-02-27 | 2010-10-07 | Jfe Steel Corp | Complex method of welding in combination of gas shield arc welding with submerged arc welding, and complex welding machine thereof |
| JP2011167741A (en) * | 2010-02-22 | 2011-09-01 | Hitachi Zosen Corp | Automatic butt welding equipment for shear-cut steel sheet |
| JP2013198926A (en) * | 2012-03-26 | 2013-10-03 | Hitachi Zosen Corp | Submerged arc welding facility for thick plate |
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| Publication number | Publication date |
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| AU2016282010A1 (en) | 2018-02-15 |
| TWI629134B (en) | 2018-07-11 |
| JP6576448B2 (en) | 2019-09-18 |
| JPWO2016208131A1 (en) | 2018-04-05 |
| TW201707820A (en) | 2017-03-01 |
| WO2016208131A1 (en) | 2016-12-29 |
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