WO2021154120A1 - Method of preparing edges for orbital laser welding - Google Patents
Method of preparing edges for orbital laser welding Download PDFInfo
- Publication number
- WO2021154120A1 WO2021154120A1 PCT/RU2020/050376 RU2020050376W WO2021154120A1 WO 2021154120 A1 WO2021154120 A1 WO 2021154120A1 RU 2020050376 W RU2020050376 W RU 2020050376W WO 2021154120 A1 WO2021154120 A1 WO 2021154120A1
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- WO
- WIPO (PCT)
- Prior art keywords
- edges
- welded
- welding
- groove
- laser
- Prior art date
Links
- 238000003466 welding Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 7
- 230000035515 penetration Effects 0.000 claims description 11
- 239000011324 bead Substances 0.000 claims description 8
- 230000013011 mating Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 8
- 230000010355 oscillation Effects 0.000 abstract description 7
- 210000001503 joint Anatomy 0.000 description 23
- 230000008569 process Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/28—Seam welding of curved planar seams
- B23K26/282—Seam welding of curved planar seams of tube sections
-
- 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
Definitions
- the invention relates to the field of welding and, in particular, to a method for preparing the edges of the parts to be welded for one-sided orbital laser welding of circumferential seams of butt non-rotating joints.
- a laser beam as a welding energy source, has a number of well-known technological advantages over arc energy sources, which are important in orbital laser welding of fixed butt ring joints [3,4]. These advantages include the high value of the concentration factor of the laser welding power source (Table 1, where k is the concentration factor of the welding power source, re is the effective radius of the heating spot), the minimum value of the effective radius of the heating spot, the focused laser beam, which makes it possible to obtain the minimum volume and weight. weld pool.
- the ability to change the diameter of the heating spot in a wide range allows you to vary the change in the power density of laser radiation in a wide range, from the implementation of laser welding in the thermal conductivity mode to laser welding in the deep penetration mode [4, 5].
- the high value of the concentration factor of the laser welding energy source minimizes the heating spot diameter (effective radius of the heating spot) and, accordingly, reduces the volume of the weld pool in comparison with arc welding. Reducing the volume of the weld pool opens up the possibility of reducing the width of the groove of the welded edges.
- Minimization of the volume of the weld pool requires adjusting the geometric dimensions of the structural elements of the groove of the welded edges in order to reduce the groove area that meets the requirements of a high value of the concentration coefficient of the laser energy source and the use of long-focus optics with a small focusing angle, which can significantly reduce the groove bevel angle and the groove width of the welded edges.
- the disadvantage of this method is the low productivity of the welding process, significant labor costs for machining edges, a high level of consumption of welding materials.
- the method relates to the field of welding.
- the method includes optimization of the geometry of structural elements for cutting the edges of the seam depending on the thickness of the welded edges, the power of the laser beam, the geometry of the focusing optics, the oscillation amplitude of the laser beam and the diameter of the welding wire.
- Structural elements of edges prepared for butt welding must provide free access of the laser beam, welding wire and shielding gases to the welding zone to form a seam.
- the objective of the present invention is to optimize the preparation of structural elements of the edges of the welded parts for one-sided multi-pass orbital laser welding of circumferential seams of butt fixed joints in order to increase the technical and economic efficiency of the welding process.
- the technical and technical and economic result of the problem being solved is an increase in the productivity of the process of obtaining permanent joints in orbital one-sided laser welding of fixed butt girth welds and economic efficiency by reducing the technological cost of the welding process as a result of increasing the welding speed, reducing consumables and labor costs for machining edges.
- the values of the geometry of the structural elements of the groove of the edges to be welded are determined based on the thickness of the materials to be welded, the technological features of laser welding in the deep penetration mode, the power of the laser beam, the scanning parameters of the laser beam and the geometric parameters of the focused laser beam.
- Optimal values of structural elements of butt-welded edges of parts for one-sided orbital multi-pass laser welding of circumferential seams of fixed joints allows obtaining high-quality welded seams in various spatial positions: lower, vertical, overhead, transitional.
- the set of distinctive features of the geometry of the structural elements of the groove of the welded parts makes it possible to increase the productivity of the process of obtaining permanent annular non-rotatable butt joints in one-sided multi-pass laser welding in comparison with automatic arc welding by reducing the number of passes.
- the technology provides a welding speed of more than 0.6 m / min.
- the volume of deposited metal in laser welding is 3 times less than in automatic arc welding.
- the groove area is 348 mm ⁇ 2.
- K - root layer, Cor-K - Correction-root pass without filler wire, Z - filling layers, O - facing layer, Cor-O - corrective-facing pass without filler wire, ⁇ ⁇ ; ⁇ ⁇ d; ⁇ ⁇ D; ⁇ ⁇ ; ⁇ ⁇ C; ⁇ ⁇ R is the tolerance field of the groove structural elements.
- the section for laser multi-pass welding can be defined as a "narrow gap” groove.
- the groove width By using long-focus optics for laser welding, having a small focusing angle, it is possible to minimize the bevel angle of the groove of the welded edges to several degrees, the groove width and obtain the so-called "narrow-gap" butt groove, which can be used for welding thick metals using a multi-pass laser welding, ).
- the choice of the geometry of the structural elements of the groove is determined by the thickness of the metal being welded, the technological features of the laser welding process, the scanning mode of the laser beam and the geometrical parameters of the focused laser beam.
- the power of the laser radiation source determines the highest value of the blunt edge height when welding in the deep penetration mode [4].
- Increasing the height of the blunt edge allows to reduce the number of passes in multi-pass welding and, accordingly, to reduce the consumption of welding materials: shielding gases and welding wire, to reduce the duration of the technological cycle of welding one joint.
- Narrow-gap groove of the welded edges makes it possible to realize, during laser welding, the layout (arrangement) of the welding layers according to the technological scheme, one bead in the layer of the weld, -five.
- This technological scheme provides the highest productivity of the welding process, since it requires a minimum amount of deposited metal.
- the high value of the concentration factor of the laser energy source in addition to advantages, has a number of disadvantages.
- the quality of the formation of the root of the seam and the back bead is largely determined by the gap between the welded surfaces of the edges of the blunting.
- the small diameter of the heating spot of the focused laser radiation requires the minimization of such a structural element as a gap or gap-free assembly, which is rather difficult to implement, especially in orbital welding of large-diameter pipes. Therefore, laser blunt welding is performed in the deep penetration mode with a filler wire.
- laser which also changes the formation of the weld pool geometry, giving the fill bead a greater width.
- the opening (width of the groove) of the edges must be commensurate with the amplitude of oscillations during oscillation of the laser beam when determining the width of the groove.
- the tolerance field for the geometric dimensions of structural elements is determined by the parameters of the welding process and the accuracy of machining.
- the value of the blunt edge height is determined by the maximum penetration depth during laser welding in the deep (channel) penetration mode [4, 10].
- Width of groove on the side of blunt edges - should not exceed double the amplitude of the oscillation of the laser beam - , but must be equal to or greater than the face width of the root bead - and is determined by condition (1).
- Bevel angle - determined by the thickness of the welded metal - , edge bluntness height - , angle of convergence of the beam of the focusing optical welding head - , condition (4) [Mathematical formula 4]
- the width of the groove of the edges to be welded from the front side of the seam - d is determined by the groove width from the root of the seam, the thickness of the metal to be welded, the height of the blunt edge, the bevel angle of the edges to be welded and the amplitude of the oscillation of the laser beam, condition (5)
- Maximum gap width - between the edges of the blunting is determined by the requirements for the quality of the formation of the root weld and the back bead, as well as the required values of the operational strength and is determined experimentally.
- a gap is allowed in some sections of the butt joint perimeter.
- the size of the gap and its length are determined by the technological instructions for automatic laser welding of fixed butt joints in accordance with the specifications for the welded structure.
- Laser welding was carried out in a shielded gas environment on a specialized ULST-1 installation for laser welding of fixed annular pipe joints.
- An LS-10 fiber laser with a power of 10 kW was used as a source of laser radiation.
- the claimed invention meets the criterion of industrial applicability, since it can be manufactured using known technical means.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
Bevel angle -
Claims (1)
- Способ подготовки свариваемых кромок деталей под орбитальную одностороннюю многопроходную лазерную сварку неповоротных стыковых кольцевых соединений включающий выполнение разделки свариваемых кромок с углом скоса кромки, шириной разделки кромок с лицевой стороны шва, шириной разделки со стороны притупления кромок, высотой притупления свариваемых кромок радиусом и утлом сопряжения скоса кромки с притуплением кромок, которые выбирают с учетом технологических особенностей, параметров и режимов лазерной сварки, геометрических параметров оптических фокусирующих головок, толщины свариваемых кромок и диаметра сварочной проволоки, при этом величину
угол подъема
угол скоса кромок
величину радиуса сопряжения
ширину разделки свариваемых кромок
а максимальную величину зазора
A method of preparing the edges of parts to be welded for orbital one-sided multi-pass laser welding of non-rotatable butt ring joints, including the preparation of the edges to be welded with the bevel angle, the width of the groove on the front side of the seam, the width of the groove on the blunt side of the edges, the bluntness height of the edges to be welded with the radius and the mating angle of the bevel with blunt edges, which are selected taking into account technological features, parameters and modes of laser welding, geometric parameters of optical focusing heads, thickness of welded edges and diameter of a welding wire, while the value
ascent angle
bevel angle
mating radius value
width of groove of edges to be welded
and the maximum clearance
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2020103742 | 2020-01-29 | ||
RU2020103742A RU2743131C1 (en) | 2020-01-29 | 2020-01-29 | Method for preparing the edge for orbital laser welding of non-rotating butt ring joints |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021154120A1 true WO2021154120A1 (en) | 2021-08-05 |
Family
ID=74666120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/RU2020/050376 WO2021154120A1 (en) | 2020-01-29 | 2020-12-13 | Method of preparing edges for orbital laser welding |
Country Status (2)
Country | Link |
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RU (1) | RU2743131C1 (en) |
WO (1) | WO2021154120A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115070252A (en) * | 2022-06-22 | 2022-09-20 | 四川航天长征装备制造有限公司 | Lock bottom welding joint |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08168892A (en) * | 1994-12-20 | 1996-07-02 | Nkk Corp | Production of welded steel pipe |
JP2002018584A (en) * | 2000-05-31 | 2002-01-22 | L'air Liquide | Application of method of hybrid arc/laser beam to welding of pipe |
RU2637034C1 (en) * | 2017-01-30 | 2017-11-29 | Публичное акционерное общество "Челябинский трубопрокатный завод" (ПАО "ЧТПЗ") | Method of pipe laser welding |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09170050A (en) * | 1995-12-18 | 1997-06-30 | Nkk Corp | Production of welded dual-phase stainless steel pipe |
DE102008029724B4 (en) * | 2007-06-26 | 2010-09-30 | V&M Deutschland Gmbh | Method for joining thick-walled metallic pieces by means of welding |
RU2637035C1 (en) * | 2017-02-06 | 2017-11-29 | Публичное акционерное общество "Челябинский трубопрокатный завод" (ПАО "ЧТПЗ") | Method of hybrid arc augmented laser welding of pipe longitudinal seam |
RU2679858C1 (en) * | 2018-02-19 | 2019-02-13 | Публичное акционерное общество "Челябинский трубопрокатный завод" (ПАО "ЧТПЗ") | Method of hybrid laser-arc welding of steel thick-walled structures |
RU2684735C1 (en) * | 2018-05-25 | 2019-04-12 | Публичное акционерное общество "Челябинский трубопрокатный завод" (ПАО "ЧТПЗ") | Method for hybrid laser-arc welding of steel pipes with outer layer of plating |
-
2020
- 2020-01-29 RU RU2020103742A patent/RU2743131C1/en active
- 2020-12-13 WO PCT/RU2020/050376 patent/WO2021154120A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH08168892A (en) * | 1994-12-20 | 1996-07-02 | Nkk Corp | Production of welded steel pipe |
JP2002018584A (en) * | 2000-05-31 | 2002-01-22 | L'air Liquide | Application of method of hybrid arc/laser beam to welding of pipe |
RU2637034C1 (en) * | 2017-01-30 | 2017-11-29 | Публичное акционерное общество "Челябинский трубопрокатный завод" (ПАО "ЧТПЗ") | Method of pipe laser welding |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115070252A (en) * | 2022-06-22 | 2022-09-20 | 四川航天长征装备制造有限公司 | Lock bottom welding joint |
CN115070252B (en) * | 2022-06-22 | 2023-11-03 | 四川航天长征装备制造有限公司 | Lock bottom welding joint |
Also Published As
Publication number | Publication date |
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RU2743131C1 (en) | 2021-02-15 |
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