WO2013084777A1 - バックシールド溶接方法およびこれを用いた溶接構造物 - Google Patents
バックシールド溶接方法およびこれを用いた溶接構造物 Download PDFInfo
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- WO2013084777A1 WO2013084777A1 PCT/JP2012/080820 JP2012080820W WO2013084777A1 WO 2013084777 A1 WO2013084777 A1 WO 2013084777A1 JP 2012080820 W JP2012080820 W JP 2012080820W WO 2013084777 A1 WO2013084777 A1 WO 2013084777A1
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- Prior art keywords
- gas supply
- welding
- supply opening
- weld
- welding method
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Classifications
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/34—Turning or inching gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/001—Turbines
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
- F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
Definitions
- the present invention relates to a back shield welding method for forming and welding and a welded structure using the same.
- Patent Document 2 in a structure in which back shield welding is difficult, in order to perform welding without a back shield, a backing portion that covers the back side of the weld joint is used as a contact edge of the weld base material. There has been disclosed a welding method in which welding is performed so as not to melt the backing portion.
- Patent Document 3 discloses a welding method that prevents the occurrence of defects in the weld joint by adjusting the components of the weld base material so that excessive oxidation does not occur in the weld bead without performing back shield. Has been.
- the diameter of the gas supply hole must be increased to some extent. It takes time to replace the active gas with air.
- the diameter of the gas supply hole increases with respect to the width of the groove protrusion end that forms the contact edge of the weld base material, the sectional shape of the groove protrusion changes abruptly, so that the welding gas supply When reaching the hole, heat was trapped around the gas supply hole, and there was a concern that the groove tip would melt and a poor welding would occur.
- a backing portion that covers the back side of the weld joint must be formed on the contact edge of the weld base material, so that the backing portion is not melted. Since welding is performed, the backing remains in a slit shape in the cross section after welding of this portion, and there is a concern that stress concentration occurs.
- the present invention has been made in view of such circumstances, and in a welded structure that is difficult to perform backshielding, the surface of the welded joint without incurring weld defects or reducing joint performance. It is an object of the present invention to provide a back shield welding method capable of supplying an inert gas from the side to the back side and easily performing back shield to improve welding quality, and a welded structure using the same.
- the present invention provides the following means.
- a first aspect of the back shield welding method according to the present invention two welding base materials are brought into contact with each other, and an inert gas is supplied to the back side of the two welding base materials, while the surface side of the welding base material is provided.
- a welding method in which the weld bead is melted to the back surface side and welding is performed, and the front surface side and the back surface side of the weld base material And a notch is formed in at least one contact edge of the two welding base materials so that a slit-like gas supply opening extending along the forming direction of the weld bead is formed.
- the abutting edges of the weld base metal are brought into contact with each other and temporarily fixed, whereby the gas supply opening is formed by the notch, and the inert gas is then formed from the gas supply opening. Forming the weld bead, Closing the gas supply opening by the weld bead.
- the inert gas from the front side to the back side of the welding base material Backshield welding can be performed while supplying, and backshield welding can be easily performed without degrading weld joint characteristics due to oxidation of the weld bead.
- the opening area is equal to or greater than that in the case of providing a conventional round hole gas supply hole.
- the width can be remarkably reduced. For this reason, even in the portion where the gas supply opening is formed, the cross-sectional shape of the groove tip of the weld base material does not change suddenly, and heat is generated around the gas supply opening when welding reaches the gas supply opening. By avoiding the trapping, it is possible to avoid the concern that the groove tip end melts down as in the prior art.
- the width of the gas supply opening is narrower than that of the conventional round hole-shaped gas supply hole. it can. For this reason, the weld bead can be formed evenly in the portion where the gas supply opening is present and the portion where the gas supply opening is absent, and the welding quality can be improved.
- the 2nd aspect of the back shield welding method which concerns on this invention is a said 1st aspect.
- WHEREIN Even if the said notch part is formed only in the one said contact edge part of the two said welding base materials. Good.
- the processing depth of the notch is doubled, but it is not necessary to process the notch on the other abutting edge. Pre-processing of the welding base material becomes easy.
- the notch portions are formed at both contact edge portions and they are combined, if the positions of both notch portions are displaced, the opening area of the gas supply opening portion is reduced by the amount of displacement.
- the notch is formed only on one of the contact edges, the position of the notch cannot be displaced, and there is no concern that the opening area of the gas supply opening is reduced. In addition, it is possible to save the trouble of aligning the position of the notch.
- the inert gas is supplied by a flat gas supply pipe, and the width dimension of the gas supply opening is determined. Further, the length dimension may be a minimum necessary dimension through which the gas supply pipe can be inserted.
- the round gas supply hole is formed.
- the opening area (width) of the gas supply opening can be made as small as possible without reducing the supply flow rate of the inert gas. Accordingly, it is possible to more effectively prevent the groove tip end portion from being melted by heat trapped around the gas supply opening when welding reaches the gas supply opening. And since the width
- the welded structure according to the fourth aspect of the present invention is manufactured using the back shield welding method according to any one of the first to third aspects.
- the above welded structure is manufactured by performing welding with the back shield completely performed, it is possible to provide a high-quality welded structure without welding defects or performance degradation at the joint. it can.
- the back shield welding method according to the present invention in a welded structure that is difficult to perform back shield, from the front side to the back side of the weld joint without causing defects in the weld joint.
- An inert gas can be supplied to easily back shield and improve the welding quality.
- the welded structure according to the present invention is welded in a state where the back shield is completely performed using the above-described back shield welding method. Can be provided as a high-quality welded structure.
- FIG. 1 is a longitudinal sectional view of a steam turbine rotor showing an example of a welded structure to which the back shield welding method according to the present invention can be applied.
- a steam turbine rotor is large and heavy and difficult to form integrally, a structure in which a plurality of rotor disks are generally arranged concentrically in the axial direction and the rotor disks are welded and integrated is generally used.
- three rotor disks 2, 3, 4 (weld base material) are arranged in the axial direction, and these rotor disks 2, 3, 4 are welded with high strength at two weld joints 5. And integrated.
- a bore (hollow part) 7 for weight reduction is formed inside the steam turbine rotor 1.
- the bore 7 is maintained in a sealed space by combining recesses formed on the end surfaces of the rotor disks 2, 3, 4.
- reverse wave welding is performed in which the weld bead 8 (see also FIG. 6) is melted from the front surface side to the back surface side of the rotor disks 2, 3, 4 as the welding base material.
- welding is performed while supplying an inert gas such as argon or helium from the front surface side and the back surface side of the weld joint 5 and substituting for air so that the weld bead 8 does not come into contact with oxygen in the air. Deterioration of joint characteristics due to generation of welding defects and oxidation is prevented.
- FIG. 2 is a longitudinal sectional view of the welded joint portion 5 before welding, showing the II portion of FIG. 1 in an enlarged manner.
- FIG. 3 is a front view of the weld joint 5 before welding showing the first embodiment of the present invention as viewed in the direction of arrow III in FIG.
- the cross-sectional shape of the welded joint 5 before welding is substantially J-shaped half grooves 10 and 11 in the contact edge portions 15 and 16 (see FIG. 3) of the rotor disks 2 and 3 (or 3 and 4) to be abutted. Is formed, and the half grooves 10 and 11 are combined to form a U-shaped groove 12 so as to form a so-called U-shaped groove shape.
- the bottom of the U-shaped groove 12 is referred to as a groove protrusion 13.
- the gas supply opening 17 has both abutting portions so that the notched portions 21 and 22 previously formed by milling or the like are aligned with both abutting edge portions 15 and 16 to be abutted. It is formed by bringing the edges 15 and 16 into contact with each other and temporarily fixing them.
- the gas supply opening 17 communicates the front side (outside) and the back side (space of the bore 7) of the rotor disks 2 and 3, and the direction in which the weld bead 8 is formed, that is, the longitudinal direction of the groove protruding end 13 It is formed in a slit shape extending in the direction along.
- the gas supply openings 17 are provided at 2 to 4 locations at equal intervals in the circumferential direction of one weld joint 5. Further, the gas supply opening 17 also functions as a gas discharge opening for discharging the surplus inert gas supplied into the bore 7 to the outside as will be described later.
- the gas supply pipe 19 inserted into the slit-shaped gas supply opening 17 is preferably a flat pipe.
- the width dimension and the length dimension of the gas supply opening 17 are the minimum necessary dimensions through which the gas supply pipe 19 can be inserted. Examples of the dimensions of the gas supply opening 17 include a width of about 1 to 2 mm and a length of about several tens of mm.
- discharge welding (mainly Tig welding) is performed by the welding torch 23 to form a weld bead 8 as shown in FIG.
- the weld bead 8 is formed so as to melt from the front surface side to the back surface side of the weld base material (rotor disks 2 and 3).
- an inert gas is supplied from the front surface side of the weld joint 5 into the U-shaped groove 12 by a gas supply means (not shown), and as described above, the back surface side of the weld joint 5 through the gas supply opening 17.
- the weld bead 8 is completely shielded (blocked) from the air during welding, and oxidation due to contact with oxygen is prevented, so that generation of weld defects and deterioration of joint characteristics are prevented.
- the gas supply openings 17 provided at two to four positions at equal intervals in the circumferential direction of one weld joint 5 are supplied with other gas while the inert gas is supplied from the one gas supply opening 17. Excess inert gas is discharged from the opening 17 together with the air inside the bore 7, whereby the air inside the bore 7 is completely replaced with the inert gas.
- the gas supply opening 17 is sequentially closed by the weld bead 8. Since the gas supply opening 17 has a narrow slit shape, the gas supply opening 17 can be easily closed by the weld bead 8, and the width of the weld bead 8 can be reduced even when viewed from the back side of the weld joint 5 as shown in FIG. 7. It can be formed evenly.
- the main welding is performed while the welding material 25 is melted into the U-shaped groove 12, and the U-shaped groove 12 is filled with the welding material 25.
- the inert gas is supplied from the surface side of the weld joint 5, the weld bead 8 and the welding material 25 are not oxidized.
- the gas supply openings 17 provided at two to four locations at equal intervals in the circumferential direction of one weld joint 5 are sequentially closed by welding, and when the last gas supply opening 17 is closed, the bore 7 It is sealed with the inside filled with an inert gas. For this reason, air does not remain in the bore 7, and internal corrosion of the rotor disks 2, 3, and 4 due to moisture and impurities in the air is prevented.
- the slit-like gas supply opening extending along the formation direction of the weld bead 8 at the joint of the weld joint 5 (groove protrusion 13).
- the part 17 is formed, and welding is performed while supplying an inert gas from here to the back surface side of the weld joint part 5.
- the width of the gas supply opening 17 can be made much narrower while the opening area of the gas supply opening 17 is equal to or larger than that.
- the width of the groove protrusion 13 at the position of the gas supply opening 17 is widened, and a sudden change in the cross-sectional shape of the groove protrusion 13 at this position is prevented. Therefore, when welding reaches the position of the gas supply opening 17, heat easily escapes to the area A (see FIG. 5) around the gas supply opening 17, so that heat is trapped in the vicinity of the gas supply opening 17. Thus, it is possible to prevent the occurrence of poor welding such that the groove protrusion 13 melts down.
- the weld bead 8 can be formed evenly in the portion where the gas supply opening 17 is present and the portion where the gas supply opening 17 is not present, and the welding quality can be improved.
- the inert gas is supplied through the flat gas supply pipe 19 and the width and length of the gas supply opening 17 are set to the minimum necessary dimensions through which the gas supply pipe 19 can be inserted,
- the opening area (width) of the gas supply opening 17 can be made as small as possible without reducing the supply flow rate of the inert gas as compared with the gas supply hole. Accordingly, it is possible to more effectively prevent the groove projecting end portion 13 from being melted due to the heat confined around the gas supply opening portion 17 when welding reaches the gas supply opening portion 17.
- the width of the gas supply opening 17 is narrow, it is easier to close with the weld bead 8, and the weld bead 8 can be formed uniformly to improve the weld quality.
- FIG. 11 is a front view of a welded joint showing a second embodiment of the present invention.
- the notch 21 is formed only in one contact edge 15 (groove protrusion end 13) of the two rotor disks 2, 3 (or 3, 4) to be abutted, and the other contact edge. 16 is left flat.
- the opening shape of the notch 21 formed in one rotor disk 2 is closed by the other rotor disk 3, and the weld bead 8 is the same as in the first embodiment.
- a slit-shaped gas supply opening 27 extending in the direction along the forming direction is formed. The configuration of the other parts and the function of the gas supply opening 27 are the same as in the first embodiment.
- the processing depth of the notch 21 is double that of the gas supply opening 17 in the first embodiment, but the other Since it is not necessary to process a notch in the contact edge 16 of the rotor disk 3, pre-processing of the rotor disk 3 is facilitated.
- the gas supply openings 17 are formed by forming the notches 21 and 22 in the contact edge portions 15 and 16 on both sides as in the first embodiment, the positions of both the notches 21 and 22 However, the notch 21 is formed only in one abutting edge 15 as in the second embodiment, although the opening area of the gas supply opening 17 is reduced by the amount of deviation. If not, the position of the notch 21 cannot be displaced, and there is no concern that the opening area of the gas supply opening 27 is reduced. In addition, the trouble of aligning the position of the notch 21 can be saved.
- FIG. 12 is a longitudinal sectional view of a welded joint showing a third embodiment of the present invention.
- the cross-sectional shape of the welded joint 30 is such that a substantially J-shaped half groove 31 and a notch 32 are formed on one of the rotor disks 2 and 3 (or 3 and 4) to be abutted, for example, on the rotor disk 2 side.
- the rotor disk 3 is not formed with a half groove or a notch.
- a so-called J-shaped groove shape is formed, and the notch 32 is closed by the rotor disk 3 to form a gas supply opening 34.
- the function of the gas supply opening 34 is the same as that of the gas supply opening 17 of the first embodiment.
- the back shield welding method according to the present invention is not limited to the U-shaped groove shape shown in the first embodiment, but is also applied to the above-mentioned J-shaped groove shape and other groove shapes. Can do. Furthermore, it can be applied to butt welding other than the groove shape.
- the present invention is not limited to the configuration of each of the embodiments described above, and can be appropriately modified or improved within the scope not departing from the gist of the present invention. Embodiments are also included in the scope of rights of the present invention.
- the example in which the back shield welding method according to the present invention is applied to the welding of the rotor disks 2, 3, and 4 constituting the steam turbine rotor 1 is described. It can also be applied to other welded structures where shield welding is difficult. For example, it is suitable for welding of thick steel pipes. Furthermore, the objects to be welded need not necessarily be tubular.
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
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- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
本発明に係るバックシールド溶接方法の第1の態様は、2つの溶接母材を当接させ、これら2つの溶接母材の裏面側に不活性ガスを供給しながら、前記溶接母材の表面側から、溶接ビードを裏面側まで溶け込むように形成して溶接を行うバックシールド溶接方法であって、当接した2つの前記溶接母材の合わせ目に、該溶接母材の表面側と裏面側とを連通させ、且つ前記溶接ビードの形成方向に沿って延在するスリット状のガス供給開口部が形成されるように、2つの前記溶接母材の少なくとも一方の当接縁部に切欠部を形成し、次に前記溶接母材の当接縁部同士を当接させて仮固定することにより、前記切欠部によって前記ガス供給開口部を形成し、次に前記ガス供給開口部から前記不活性ガスを供給しながら、前記溶接ビードを形成し、該溶接ビードによって前記ガス供給開口部を閉塞する。
しかも、両方の当接縁部に切欠部を形成してこれらを合わせる場合に、両方の切欠部の位置がずれた場合には、ずれた分だけガス供給開口部の開口面積が減少してしまうが、切欠部が一方の当接縁部のみにしか形成されていなければ、切欠部の位置ずれが起こり得ず、ガス供給開口部の開口面積が減少する懸念がない。その上、切欠部の位置を合わせる手間を省くことができる。
また、本発明に係る溶接構造物は、上記バックシールド溶接方法を用いて、バックシールドが完全に行われた状態で溶接が実施されたものであるため、溶接欠陥や継手部分における性能低下がなく、高品質な溶接構造物として提供することができる。
以下に、本発明に係るバックシールド溶接方法の第1実施形態について説明する。
図2は図1のII部を拡大して示す溶接前の溶接接合部5の縦断面図である。また、図3は図2のIII矢視により本発明の第1実施形態を示す溶接前の溶接接合部5の正面図である。溶接前の溶接接合部5の断面形状は、突き合わせられるロータディスク2,3(または3,4)の当接縁部15,16(図3参照)にそれぞれ略J字状の半溝10,11が形成され、これらの半溝10,11同士が合わせられてU字溝12が形成される、いわゆるU形開先形状となっている。ここではU字溝12の底部を開先突端部13と呼ぶ。
このため、従来の丸孔状のガス供給孔を設けた場合と比較して、ガス供給開口部17の開口面積を同等以上としながらも、その幅を格段に狭くすることができ、その分、ガス供給開口部17の位置における開先突端部13の幅が広くなって、この位置における開先突端部13の断面形状が急変することが防止される。
したがって、溶接がガス供給開口部17の位置に差し掛かった時に、ガス供給開口部17の周囲の領域A(図5参照)に熱が逃げやすく、このためガス供給開口部17の近傍に熱がこもって開先突端部13が溶け落ちるといった溶接不良が発生することを防止することができる。
これにより、溶接がガス供給開口部17に差しかかった時にガス供給開口部17の周囲に熱がこもることによる開先突端部13の溶け落ちを一層有効に防止することができる。しかも、ガス供給開口部17の幅が狭いため、溶接ビード8による閉塞がより容易になり、溶接ビード8を均等に形成して溶接品質を向上させることができる。
これに対し、図10に示すように、従来の丸孔状のガス供給孔を形成する切欠部Cの合わせ位置がずれてしまうと、ここに挿入できるガス供給管の有効直径dが著しく小さくなってしまう。例えば、直径5ミリの切欠部Cが1ミリずれた場合には、ここに挿入できるガス供給管の直径dは僅か3ミリに限られてしまう。
次に、本発明に係るバックシールド溶接方法の第2実施形態について説明する。
図11は、本発明の第2実施形態を示す溶接接合部の正面図である。ここでは、突き合わせられる2つのロータディスク2,3(または3,4)の一方の当接縁部15(開先突端部13)にのみ切欠部21が形成されており、他方の当接縁部16は平坦なままとされている。これら2つのロータディスク2,3が合わせられると、一方のロータディスク2に形成された切欠部21の開口形状が他方のロータディスク3により閉塞され、第1実施形態と同様な、溶接ビード8の形成方向に沿う方向に延在するスリット状のガス供給開口部27が形成される。その他の部分の構成およびガス供給開口部27の機能は第1実施形態と同様である。
図12は、本発明の第3実施形態を示す溶接接合部の縦断面図である。この溶接接合部30の断面形状は、突き合わせられるロータディスク2,3(または3,4)の一方、例えばロータディスク2側に略J字状の半溝31と切欠部32が形成され、他方のロータディスク3には半溝も切欠部も形成されていない。ロータディスク2と3が合わせられると、いわゆるJ形開先形状が構成され、切欠部32がロータディスク3に閉塞されてガス供給開口部34となる。ガス供給開口部34の機能は第1実施形態のガス供給開口部17と同様である。
2,3,4 ロータディスク(溶接母材)
5,30 溶接接合部
7 ボア
8 溶接ビード
10,11,31 半溝
12 U字溝
13 開先突端部
15,16 当接縁部
17,27,34 ガス供給開口部
19 ガス供給管
21,22,32 切欠部
25 溶接材料
G 不活性ガス
Claims (4)
- 2つの溶接母材を当接させ、これら2つの溶接母材の裏面側に不活性ガスを供給しながら、前記溶接母材の表面側から、溶接ビードを裏面側まで溶け込むように形成して溶接を行うバックシールド溶接方法であって、
当接した2つの前記溶接母材の合わせ目に、該溶接母材の表面側と裏面側とを連通させ、且つ前記溶接ビードの形成方向に沿って延在するスリット状のガス供給開口部が形成されるように、2つの前記溶接母材の少なくとも一方の当接縁部に切欠部を形成し、
次に前記溶接母材の当接縁部同士を当接させて仮固定することにより、前記切欠部によって前記ガス供給開口部を形成し、
次に前記ガス供給開口部から前記不活性ガスを供給しながら、前記溶接ビードを形成し、該溶接ビードによって前記ガス供給開口部を閉塞するバックシールド溶接方法。 - 前記切欠部は、2つの前記溶接母材の一方の前記当接縁部にのみ形成されている請求項1に記載のバックシールド溶接方法。
- 前記不活性ガスの供給は偏平なガス供給管により行い、前記ガス供給開口部の幅寸法および長さ寸法は、前記ガス供給管を挿通できる必要最小限の寸法である請求項1または2に記載のバックシールド溶接方法。
- 請求項1から3のいずれかに記載のバックシールド溶接方法を用いて製作された溶接構造物。
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CN109877423A (zh) * | 2019-04-16 | 2019-06-14 | 海洋石油工程股份有限公司 | 基于动态送丝热丝氩弧焊的9%镍钢焊接工艺 |
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