WO2023123735A1 - Procédé de soudage laser destiné à améliorer la résistance et la ténacité d'un joint de soudure - Google Patents

Procédé de soudage laser destiné à améliorer la résistance et la ténacité d'un joint de soudure Download PDF

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WO2023123735A1
WO2023123735A1 PCT/CN2022/086040 CN2022086040W WO2023123735A1 WO 2023123735 A1 WO2023123735 A1 WO 2023123735A1 CN 2022086040 W CN2022086040 W CN 2022086040W WO 2023123735 A1 WO2023123735 A1 WO 2023123735A1
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welding
laser
gas
pipeline steel
laser welding
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PCT/CN2022/086040
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Chinese (zh)
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沈鑫珺
王晓南
陈龙
张庆宇
胡增荣
刘珍光
孙茜
邸洪双
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苏州大学
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Publication of WO2023123735A1 publication Critical patent/WO2023123735A1/fr

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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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • 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

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  • the invention belongs to the technical field of laser welding, and in particular relates to a laser welding method for improving the strength and toughness of weld seams, specifically a laser welding method for improving the strength and toughness of weld seams of high-grade pipeline steel by regulating and controlling shielding gas to induce acicular ferrite .
  • the cumulative heat input during multi-pass welding of arc welding will expand the heat-affected zone, coarsen the grains of the welded joint, and further reduce the mechanical properties of the welded joint, especially the low-temperature impact toughness of the joint is significantly lower than that of the base metal ( ⁇ 10% of the base metal impact energy), which greatly reduces the safety and reliability of pipeline steel.
  • high-power lasers can achieve single-pass penetration of medium and thick plates, and have the advantages of fast welding speed, large aspect ratio, small thermal deformation, narrow heat-affected zone and high degree of automation. It has broad application prospects.
  • the weld seam is an important part of the welded joint, and its tissue type determines the performance of the weld seam. It is well known that acicular ferrite has positive effects in deflecting crack propagation direction, hindering crack propagation and improving toughness due to its interlocking structure and grain refinement.
  • inert gas argon or helium
  • inert gas argon or helium
  • the microstructure in the laser welded seam of high-grade pipeline steel is mainly bainite and martensite with poor toughness, and acicular ferrite welded seam with high volume fraction can rarely be produced in laser welded seam organize.
  • the purpose of the present invention is to provide a laser welding method that improves the strength and toughness of the weld.
  • the method provided by the invention realizes the strength and toughness of the weld, reduces welding costs, and significantly improves welding efficiency.
  • the invention provides a laser welding method for improving the strength and toughness of the weld, comprising:
  • the high-grade pipeline steel is laser welded to induce the formation of acicular ferrite in the weld;
  • the shielding gas includes:
  • the protective gas further includes: compressed air.
  • the flow rate of the compressed air is 0-40 L/min.
  • the blowing mode of the compressed air is coaxial blowing.
  • the inert gas includes:
  • the oxidizing active gas includes:
  • the flow rate of the protective gas is 0-45L/min.
  • the blowing method of the oxidizing gas is side blowing.
  • the blowing angle of the side blowing is 0-75°.
  • the volume content of the inert gas in the protective gas is ⁇ 100%.
  • the inventive method of the present invention introduces a mixture of inert gas and oxidizing gas in the laser welding process, and under the action of strong ionization and irradiation of laser, oxygen ions produced by ionization of oxidizing gas (CO 2 ) and metal elements in the molten pool
  • the reaction produces a large number of Ti 2 O 3 -MnO-Al 2 O 3 -SiO 2 composite inclusions with a size of about 1 ⁇ m; this composite inclusion can absorb manganese ions of about 124 nm around itself into its interior, resulting in a local area around the inclusion
  • the manganese-depleted area is formed; the manganese-deficient area increases the nucleation driving force of acicular ferrite, resulting in the formation of acicular ferrite with a volume fraction of up to 92% in laser welding of high-grade pipeline steel.
  • the density of inclusions in the weld metal increases by 4 times compared with that of pure inert gas, and the impact energy increases by more than 8 times; this is mainly because the laser is more concentrated than the arc energy and ionizes the oxidizing gas more thoroughly. caused by.
  • the introduction of oxidizing gas can perfectly solve the problem of argon holes in laser welding of thick plates, which greatly improves the welding quality of the weld and improves the reliability of the welded joint.
  • the invention can generate effective inclusions in the laser welding seam region of high-grade pipeline steel and successfully induce the formation of acicular ferrite, and has the advantages of simple operation, high operating efficiency, and good quality of welded joints compared with arc welding. Good, and the advantage of reducing welding and production costs.
  • Fig. 1 is the flow chart of laser welding in the embodiment of the present invention.
  • Fig. 2 is the metallographic structure diagram of X100 pipeline steel in the embodiment of the present invention.
  • Fig. 3 is the metallographic structure diagram of the laser weld seam that embodiment 1 of the present invention obtains;
  • Fig. 4 is the metallographic structure diagram of the laser weld seam that the embodiment 2 of the present invention obtains;
  • Fig. 5 is the metallographic structure diagram of the laser weld seam that embodiment 3 of the present invention obtains
  • Example 6 is a composition distribution diagram of inclusions in laser welds obtained in Example 3 of the present invention.
  • Fig. 7 is the metallographic structure diagram of the laser welding seam that comparative example 1 of the present invention obtains
  • Fig. 8 is the component distribution figure of the inclusion in the laser welding seam that comparative example 1 of the present invention obtains;
  • Fig. 9 is the statistical diagram of the impact energy of the welds obtained in Examples 1 to 3 and Comparative Example 1 at -40°C (the dotted line is the impact energy of the base metal at -40°C);
  • Fig. 10 is a stress-strain statistical graph of the welds obtained in Examples 1-3 and Comparative Example 1 (wherein the dotted line is the strength requirement of the national standard for X100 pipeline steel: ⁇ 760 MPa).
  • the invention provides a laser welding method for improving the strength and toughness of the weld, comprising:
  • the process flow chart of the laser welding method is shown in FIG. 1 .
  • the protective gas includes:
  • the inert gas is preferably selected from argon and/or helium.
  • the oxidatively active gas is preferably selected from carbon dioxide and/or oxygen.
  • the protective gas is preferably two combinations, three combinations or four combinations of argon, helium, carbon dioxide and oxygen, and the protective gas must contain an inert gas.
  • the volume content of the inert gas in the protective gas is preferably ⁇ 100%, more preferably 10%-90%, more preferably 20-80%, more preferably 30-70%, more preferably 40% -60%, most preferably 50-60%.
  • the volume content in the protective gas is preferably 15-100%, more preferably 20-90%, more preferably 30-80%, more preferably 40-70% %, most preferably 50-60%.
  • the volume content in the protective gas is preferably ⁇ 20%, more preferably 1% to 20%, more preferably 5% to 15%, most preferably 10% to 15%.
  • the gas blowing method during the laser welding process is preferably side blowing; the gas flow rate is preferably 0-45L/min, more preferably 5-40L/min, More preferably 10-35 L/min, more preferably 15-30 L/min, most preferably 20-25 L/min.
  • the blowing angle is preferably 0-75°, more preferably 5-70°, more preferably 10-60°, more preferably 20-50° °, most preferably 30-40°; the horizontal distance from the blowing position of the protective gas to the laser spot is preferably 2mm-25mm, more preferably 5-20mm, most preferably 10-15mm.
  • the protective gas preferably further includes: compressed air.
  • the volume content of nitrogen in the compressed air is preferably 75-85%, more preferably 78-82%, most preferably 79%; the volume content of oxygen in the compressed air is preferably 15-25% , more preferably 18 to 22%, most preferably 19%.
  • the gas blowing method in the laser welding process is preferably coaxial gas blowing; the gas flow is preferably 0-40L/min, more preferably 5-35L/min, more preferably 10 to 30 L/min, more preferably 15 to 25 L/min, most preferably 20 L/min.
  • the protective gas preferably includes: inert gas, oxidizing active gas, and compressed air.
  • inert gas, oxidizing active gas, and compressed air simultaneously in the laser welding process; the blowing mode of inert gas and oxidizing active gas is side blowing; the blowing mode of compressed air is coaxial blowing, in order to protect Laser optics are contaminated by spatter.
  • composition of the high-grade pipeline steel is:
  • the balance is Fe.
  • the mass content of the C is preferably 0.038-0.042%, more preferably 0.041%; the mass content of the Si is preferably 0.23-0.27%, more preferably 0.25%; the mass content of the Mn is preferably 1.8-2.2%, more preferably 1.87%; the mass content of Al is preferably 0.0026-0.0029%, more preferably 0.0027-0.0028%; the mass content of Ti is preferably 0.012-0.018%, more preferably 0.014% ⁇ 0.016%; the mass content of the Ni is preferably 0.23 ⁇ 0.27%, more preferably 0.25%; the mass content of the Cr is preferably 0.23 ⁇ 0.27%, more preferably 0.25%; the mass content of the Cu is preferably 0.18-0.22%, more preferably 0.2%; the mass content of Mo is preferably 0.18-0.22%, more preferably 0.2%; the mass content of Nb is preferably 0.061-0.064%, more preferably 0.062-0.063% .
  • the high-grade pipeline steel is preferably a plate; the thickness of the plate is preferably 5-50 mm, more preferably 10-40 mm, and most preferably 20-30 mm.
  • the surface of the high-grade pipeline steel is preferably cleaned before the laser welding; the cleaning reagent preferably includes acetone or absolute ethanol.
  • the high-grade pipeline steel is preferably placed on the welding workbench and fixed with welding fixtures.
  • laser parameter setting and robot welding programming are preferably performed in the laser welding process, and the robot laser welding program is written according to the welding path, welding order and welding direction and the target point is taught.
  • single-pass laser welding can be performed according to the thickness of the high-grade pipeline steel, and the front and back sides can also be alternately welded.
  • the alternate welding is preferably 1 to 6 passes of laser welding, more preferably 2 to 5 passes, most preferably 3 to 4 passes.
  • the laser in the laser welding process is preferably selected from one of fiber lasers, CO2 lasers and semiconductor lasers; the laser welding mode is preferably selected from one of continuous laser welding, pulsed laser and swing laser welding
  • the welding method is preferably selected from one of overhead welding, flat welding, vertical upward welding, vertical downward welding, internal welding, external welding and ring welding.
  • the included angle between the laser direction and the vertical axis direction of the high-grade pipeline steel during the laser welding process is preferably 0-15°, more preferably 5-10°, and most preferably 6-8°.
  • the parameters in the laser welding process are set as follows: the laser power is preferably 300W to 20kW, more preferably 1 to 15kW, more preferably 5 to 10kW, most preferably 6 to 8kW; the welding speed is preferably 10cm/min ⁇ 40m/min, more preferably 50cm/min ⁇ 30m/min, more preferably 1 ⁇ 20m/min, more preferably 5 ⁇ 15m/min, more preferably 8 ⁇ 12m/min, most preferably 10m /min; defocus amount is preferably -20 ⁇ 10mm, more preferably -15 ⁇ 5mm, most preferably -10 ⁇ 1mm; spot diameter is preferably 0.1 ⁇ 6mm, more preferably 0.3 ⁇ 4mm, more preferably 0.6 ⁇ 2mm , most preferably 0.8 to 1 mm.
  • the metallographic structure of the weld is mainly acicular ferrite, and the volume fraction of acicular ferrite in the metallographic structure is ⁇ 80%, and the rest is granular bainite, lath bainite A mixed structure of any proportion of tensite, martensite and Mayor components.
  • the present invention proposes a laser welding method that induces acicular ferrite by regulating and controlling the shielding gas, and improves the strength and toughness of high-grade pipeline steel weld seams.
  • the oxygen ions decomposed under the strong ionization of the laser react with the metal ions in the laser molten pool to form Ti 2 O 3 -MnO-Al 2 O 3 -SiO 2 composite inclusions; the manganese-poor region around the inclusions induces laser welding
  • the formation of a large amount of acicular ferrite in the seam realizes the strength and toughness matching of the weld, reduces the welding cost, and significantly improves the welding efficiency.
  • a laser welding method for enhancing the strength and toughness of high-grade pipeline steel weld seams comprising the following steps:
  • Step (1) cleaning before welding, using an organic liquid to clean the surface of the oily high-grade pipeline steel workpiece;
  • Step (2) clamping, placing the high-grade pipeline steel workpiece processed in step (1) on the welding workbench, and fixing it with welding fixtures;
  • Step (3) select the type and content of suitable shielding gas mixed gas
  • Step (4) laser parameter setting and robot welding programming, and according to the welding path, welding sequence and welding direction, write the robot laser welding program and teach the target point;
  • step (5) laser welding is performed on the high-grade pipeline steel to induce the formation of acicular ferrite in the weld seam, and a pendulum impact test and a tensile test are performed on the weld seam.
  • Step (1) Use absolute ethanol to remove oil stains on the surface of high-grade pipeline steel plates;
  • Step (2) assemble two pieces of high-grade pipeline steel plates on the welding jig, the gap between the two plates is 0mm, and no bevel is opened;
  • the protective gas is a mixture of 80% Ar+20% CO 2 (volume percentage), the gas flow rate is 30L/min, the protective gas is blown sideways, the blowing angle is 15°, and the blowing position is at the level of the laser spot The distance is about 15mm; select compressed air at the same time, wherein the volume content of oxygen is 21%, the volume content of nitrogen is 79%, blowing coaxially, the gas flow rate is 30L/min, and the laser lens is protected from splash pollution; step (4) and step ( 5) Use the CWX-3KW fiber laser to perform laser tailor welding on two high-grade pipeline steel plates.
  • the welding power is 3000W, the welding speed is 30cm/min, the defocus is 0mm, and the spot diameter is 0.30mm.
  • Example 1 the thickness of the two high-grade pipeline steel plates is 6 mm, the model is X100, and the strength grade is 700 MPa.
  • the structure of the high-grade pipeline steel plates is granular bainite.
  • Figure 2 the high-grade pipeline steel The ingredients are shown in Table 1.
  • the metallographic sample of 20 ⁇ 5 ⁇ 6 mm was cut out of the welded sample by a CNC wire cutting machine, and after inlaying, grinding, polishing and corrosion, the metallographic sample was observed with an Olympus-X53 metallographic microscope, and the obtained The metallographic structure of the laser weld as shown in Figure 3; from Figure 3, it can be clearly seen that the off-white slender acicular ferrite structure.
  • the welded sample was processed into an impact sample with a size of 55 ⁇ 10 ⁇ 4mm, and a V-groove was processed at the weld with a broach.
  • the low-temperature impact test of the sample was carried out, and the test results (Statistical results of impact energy of different shielding gases) As shown in Figure 9, the impact energy of the weld at -40°C increases with the increase of CO 2 content in the shielding gas, and the impact energy of 20% CO 2 is 14J.
  • the welded sample is processed into a tensile sample, and the tensile test is carried out on the universal tensile machine (according to the standard GB/T228.1-2010), the tensile speed is 3mm/min, and the test results (tensile statistical results )
  • the weld strength reaches a maximum of 775MPa under the condition of 20% CO 2 , meeting the requirement of pipeline steel strength ⁇ 760MPa.
  • a laser welding method for enhancing the strength and toughness of high-grade pipeline steel weld seams comprising the following steps:
  • Step (1) cleaning before welding, using an organic liquid to clean the surface of the oily high-grade pipeline steel workpiece;
  • Step (2) clamping, placing the high-grade pipeline steel workpiece processed in step (1) on the welding workbench, and fixing it with welding fixtures;
  • Step (3) select the type and content of suitable shielding gas mixed gas
  • Step (4) laser parameter setting and robot welding programming, and according to the welding path, welding sequence and welding direction, write the robot laser welding program and teach the target point;
  • step (5) laser welding is performed on the high-grade pipeline steel to induce the formation of acicular ferrite in the weld seam, and a pendulum impact test and a tensile test are performed on the weld seam.
  • Step (1) Use absolute ethanol to remove oil stains on the surface of high-grade pipeline steel plates;
  • Step (2) assemble two pieces of high-grade pipeline steel plates on the welding jig, the gap between the two plates is 0mm, and no bevel is opened;
  • Step (3) Select the mixed gas of 40% Ar+60% CO 2 (volume percentage content), the gas flow rate is 30L/min, the side blowing protective gas is used, the blowing angle is 15°, and the blowing position is at the level of the laser spot The distance is about 15mm; at the same time, use compressed air, wherein the volume content of oxygen is 21%, and the content of nitrogen gas is 79%, blowing coaxially, the gas flow rate is 30L/min, to protect the laser lens from splash pollution; step (4) And step (5) using a CWX-3KW fiber laser to perform laser tailor welding on two high-grade pipeline steel plates, the welding power is 3000W, the welding speed is 30cm/min, the defocus is 0mm, and the spot diameter is 0.30mm.
  • the thickness of the two high-grade pipeline steel plates in Example 2 is both 6 mm, the model is X100, and the strength grade is 700 MPa.
  • the structure of the high-grade pipeline steel plates is granular bainite, as shown in Figure 2.
  • the composition is shown in Table 1.
  • the metallographic sample of 20 ⁇ 5 ⁇ 6 mm was cut out of the welded sample by a CNC wire cutting machine, and after inlaying, grinding, polishing and corrosion, the metallographic sample was observed with an Olympus-X53 metallographic microscope, and the obtained The metallographic structure of the laser weld as shown in Figure 4; from Figure 4, it can be clearly seen that the off-white slender acicular ferrite structure.
  • the welded sample is processed into an impact sample with a size of 55 ⁇ 10 ⁇ 4mm, and a V-groove is processed at the weld with a broach, and the low-temperature impact test of the sample is carried out at -40°C
  • the detection method is the same as in Example 1), and the detection results are shown in Figure 9.
  • the impact energy of the weld seam shows an upward trend with the increase of CO2 content in the shielding gas, and the impact energy of 60% CO2 is 27J.
  • welded sample is processed tensile sample, carries out tensile test (same as embodiment 1 detection method) on universal tensile machine, and tensile speed is 3mm/min, and detection result is as shown in Figure 10, by It can be seen from the figure that as the CO 2 content in the shielding gas increases, the weld strength reaches a maximum of 800MPa under the condition of 60% CO 2 , meeting the requirement of pipeline steel strength ⁇ 760MPa.
  • a laser welding method for enhancing the strength and toughness of high-grade pipeline steel weld seams comprising the following steps:
  • Step (1) cleaning before welding, using an organic liquid to clean the surface of the oily high-grade pipeline steel workpiece;
  • Step (2) clamping, placing the high-grade pipeline steel workpiece processed in step (1) on the welding workbench, and fixing it with welding fixtures;
  • Step (3) select the type and content of suitable shielding gas mixed gas
  • Step (4) laser parameter setting and robot welding programming, and according to the welding path, welding sequence and welding direction, write the robot laser welding program and teach the target point;
  • step (5) laser welding is performed on the high-grade pipeline steel to induce the formation of acicular ferrite in the weld seam, and a pendulum impact test and a tensile test are performed on the weld seam.
  • Step (1) Use absolute ethanol to remove oil stains on the surface of high-grade pipeline steel plates;
  • Step (2) assemble two pieces of high-grade pipeline steel plates on the welding jig, the gap between the two plates is 0mm, and no bevel is opened;
  • Step (3) Select 100% CO2 protective gas, the gas flow rate is 30L/min, use side blowing protective gas, the blowing angle is 15°, and the horizontal distance between the blowing position and the laser spot is about 15mm; at the same time, use compressed air, Wherein the oxygen volume content is 21%, the nitrogen volume content is 79%, coaxial blowing, the gas flow rate is 30L/min, and the protection laser lens is polluted by splashing;
  • Step (4) and step (5) utilize CWX-3KW fiber laser to two Laser tailor welding is performed on a high-grade pipeline steel plate, the welding power is 3000W, the welding speed is 30cm/min, the defocus is 0mm, and the spot diameter is 0.30mm.
  • Example 3 the thickness of the two high-grade pipeline steel plates is 6 mm, the model is X100, and the strength grade is 700 MPa.
  • the structure of the high-grade pipeline steel plates is granular bainite, as shown in Figure 2. The ingredients are shown in Table 1.
  • the metallographic sample of 20 ⁇ 5 ⁇ 6 mm was cut out of the welded sample by a CNC wire cutting machine, and after inlaying, grinding, polishing and corrosion, the metallographic sample was observed with an Olympus-X53 metallographic microscope, and the obtained The metallographic structure of the laser weld as shown in Figure 5; from Figure 5, it can be clearly seen the off-white slender acicular ferrite structure.
  • the welded sample is processed into an impact sample with a size of 55 ⁇ 10 ⁇ 4mm, and a V groove is processed at the weld with a broach, and the low temperature impact test of the sample is carried out at -40°C (test method The same as in Example 1), the test results are shown in Figure 9, the impact energy of the weld seam at -40°C increases with the increase of CO content in the shielding gas, and the impact energy of 100% CO is 28.7J, reaching the parent 72% of the wood.
  • welded sample is processed tensile sample, carries out tensile test (detection method is identical with embodiment 1) on universal tensile machine, and tensile speed is 3mm/min, and detection result is as shown in Figure 10, by It can be seen from the figure that as the CO 2 content in the shielding gas increases, the weld strength reaches a maximum of 795MPa under the condition of 100% CO 2 , meeting the requirement of pipeline steel strength ⁇ 760MPa.
  • a laser welding method for enhancing the strength and toughness of high-grade pipeline steel weld seams comprising the following steps:
  • Step (1) cleaning before welding, using an organic liquid to clean the surface of the oily high-grade pipeline steel workpiece;
  • Step (2) clamping, placing the high-grade pipeline steel workpiece processed in step (1) on the welding workbench, and fixing it with welding fixtures;
  • Step (3) select the type and content of suitable shielding gas mixed gas
  • Step (4) laser parameter setting and robot welding programming, and according to the welding path, welding sequence and welding direction, write the robot laser welding program and teach the target point;
  • step (5) laser welding is performed on the high-grade pipeline steel to induce the formation of acicular ferrite in the weld seam, and a pendulum impact test and a tensile test are performed on the weld seam.
  • Step (1) Use absolute ethanol to remove oil stains on the surface of high-grade pipeline steel plates;
  • Step (2) assemble two pieces of high-grade pipeline steel plates on the welding jig, the gap between the two plates is 0mm, and no bevel is opened;
  • Step (3) Select 100% Ar (volume percentage) protective gas, the gas flow rate is 30L/min, use side blowing protective gas, the blowing angle is 15°, and the horizontal distance between the blowing position and the laser spot is about 15mm;
  • Select compressed air simultaneously wherein the volume content of oxygen is 21%, and the price increase content of nitrogen is 79%, coaxial blowing, gas flow rate is 30L/min, and protection laser lens is polluted by splash;
  • Step (4) and step (5) The CWX-3KW fiber laser is used for laser tailor welding of two high-grade pipeline steel plates.
  • the welding power is 3000W, the welding speed is 30cm/min, the defocus is 0mm, and the spot diameter is 0.30mm.
  • the thickness of the two high-grade pipeline steel plates in Comparative Example 1 is both 6mm, the model is X100, and the strength grade is 700MPa.
  • the structure of the high-grade pipeline steel plates is granular bainite, as shown in Figure 2.
  • the composition is shown in Table 1.
  • the metallographic sample of 20 ⁇ 5 ⁇ 6 mm was cut out of the welded sample by a CNC wire cutting machine, and after inlaying, grinding, polishing and corrosion, the metallographic sample was observed with an Olympus-X53 metallographic microscope, and the obtained The metallographic structure of the laser weld as shown in Figure 7; from Figure 7, the granular bainite structure can be clearly seen.
  • the welded sample is processed into an impact sample with a size of 55 ⁇ 10 ⁇ 4mm, and a V-groove is processed at the weld with a broach, and the low-temperature impact test of the sample is carried out at -40°C
  • the detection method is the same as in Example 1), and the detection results are shown in Figure 9.
  • the impact energy of the weld seam shows a significant downward trend with the decrease of the CO content in the shielding gas, and the impact energy of 100% Ar is 5J.
  • welded sample is processed tensile sample, carries out tensile test (same as embodiment 1 detection method) on universal tensile machine, and tensile speed is 3mm/min, and detection result is as shown in Figure 10, by It can be seen from the figure that the weld strength is 792MPa under the condition of 100% Ar, which meets the requirement of pipeline steel strength ⁇ 760MPa.
  • the oxygen ions produced by the ionization of the oxidizing gas (CO 2 ) in the mixed gas react with the metal elements in the molten pool to form a large number of metal elements with a size of about 1 ⁇ m.
  • the manganese-poor region around the inclusions induces the formation of acicular ferrite with a volume fraction of up to 92% in the laser weld It realizes the strength and toughness matching of the weld, and has the advantages of simple operation, high work efficiency, good quality of welded joints, and reduced welding and production costs.
  • the laser has the advantages of high energy density, fast welding speed, small heat input, small deformation, and high welding efficiency, the heat-affected zone is narrower and the structure is refined compared with arc welding.
  • the low-temperature toughness of the laser welding seam can be increased by more than 8 times by using the mixed protective gas to perform laser welding on the high-grade pipeline steel, and has certain engineering significance.

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Abstract

Un procédé de soudage laser destiné à améliorer la résistance et la ténacité d'un joint de soudure consiste : en présence d'un gaz protecteur, à effectuer un soudage laser sur un pipeline en acier de qualité élevée, et à induire un joint de soudure afin de générer une ferrite aciculaire, le gaz protecteur comprenant un gaz inerte et un gaz actif oxydant. Dans le processus de soudage laser, une inclusion composite est générée, et une région à faible teneur en manganèse formée autour de l'inclusion induit la génération d'une grande quantité de ferrite aciculaire dans un joint de soudure laser, produisant ainsi le joint de soudure à résistance et ténacité adaptées. En outre, le procédé réduit le coût de soudage, et améliore significativement l'efficacité de soudage.
PCT/CN2022/086040 2021-12-30 2022-04-11 Procédé de soudage laser destiné à améliorer la résistance et la ténacité d'un joint de soudure WO2023123735A1 (fr)

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CN202111655786.7A CN114211110A (zh) 2021-12-30 2021-12-30 一种改善焊缝强韧性的激光焊接方法
CN202111655786.7 2021-12-30

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CN114211110A (zh) * 2021-12-30 2022-03-22 苏州大学 一种改善焊缝强韧性的激光焊接方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003200284A (ja) * 2001-11-02 2003-07-15 Jfe Steel Kk レーザビーム溶接継手およびレーザビーム溶接継手の製造方法
JP2011206777A (ja) * 2010-03-29 2011-10-20 Jfe Steel Corp 溶接金属部の靭性に優れた鋼材のレーザ溶接継手およびレーザ溶接方法。
CN104588882A (zh) * 2014-12-09 2015-05-06 上海航天精密机械研究所 具有惰性气体保护系统的激光焊接机
CN106238915A (zh) * 2016-08-25 2016-12-21 苏州大学 一种钛微合金化碳锰钢的激光拼焊方法
CN110539076A (zh) * 2019-09-19 2019-12-06 天津玛斯特车身装备技术有限公司 用于激光焊接的保护气体及应用其的激光焊接方法
CN114211110A (zh) * 2021-12-30 2022-03-22 苏州大学 一种改善焊缝强韧性的激光焊接方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1765306A1 (de) * 1968-04-27 1971-07-22 Messer Griesheim Gmbh Schutzgas zum Lichtbogenschweissen
JP5132019B2 (ja) * 2001-02-16 2013-01-30 Ｊｆｅスチール株式会社 溶接継手部靱性に優れた極低炭素鋼溶接継手の製造方法
CN109530920A (zh) * 2018-11-30 2019-03-29 东北大学 一种高钢级管线钢激光-mag复合焊接方法
CN110202241A (zh) * 2019-07-02 2019-09-06 苏州大学 一种高钢级管线钢管焊接工艺及焊接接头

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003200284A (ja) * 2001-11-02 2003-07-15 Jfe Steel Kk レーザビーム溶接継手およびレーザビーム溶接継手の製造方法
JP2011206777A (ja) * 2010-03-29 2011-10-20 Jfe Steel Corp 溶接金属部の靭性に優れた鋼材のレーザ溶接継手およびレーザ溶接方法。
CN104588882A (zh) * 2014-12-09 2015-05-06 上海航天精密机械研究所 具有惰性气体保护系统的激光焊接机
CN106238915A (zh) * 2016-08-25 2016-12-21 苏州大学 一种钛微合金化碳锰钢的激光拼焊方法
CN110539076A (zh) * 2019-09-19 2019-12-06 天津玛斯特车身装备技术有限公司 用于激光焊接的保护气体及应用其的激光焊接方法
CN114211110A (zh) * 2021-12-30 2022-03-22 苏州大学 一种改善焊缝强韧性的激光焊接方法

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