CN115740835A - Welding wire for improving performance of thin aluminum-silicon coating hot-formed manganese-boron steel welding joint and welding method - Google Patents
Welding wire for improving performance of thin aluminum-silicon coating hot-formed manganese-boron steel welding joint and welding method Download PDFInfo
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Abstract
The invention relates to a welding wire and a welding method for improving the performance of a thin aluminum-silicon coating hot-formed manganese-boron steel welding joint, and belongs to the technical field of welding. The technical problem that the strength and plasticity of a welding joint are seriously reduced when the hot-formed manganese boron steel is subjected to laser tailor-welding in the prior art is solved. The welding wire comprises 0.06wt% -0.2wt% of C, 0.5wt% -0.9wt% of Si, 1.5wt% -1.9wt% of Mn, 0.2wt% -0.6wt% of Cr, 1.4wt% -2.6wt% of Ni, 0.25wt% -0.6wt% of Mo, and the balance of iron and inevitable impurities. The welding wire improves the working efficiency and the product performance, and reduces the process difficulty and the cost.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding wire and a welding method for improving the performance of a thin aluminum-silicon coating hot-formed manganese-boron steel welding joint.
Background
The laser tailor-welded blank is an integral plate formed by automatically splicing and welding a plurality of steel materials, stainless steel materials, aluminum alloy materials and the like with different materials, different thicknesses and different coatings by adopting high-temperature energy. The laser tailor-welded blank can meet different requirements of parts on material performance, and light weight of equipment such as automobiles can be realized by using the lightest weight, the optimal structure and the optimal performance.
The hot-formed manganese boron steel is ultrahigh-strength steel with light weight and safety requirements, is prepared by adopting hot forming and rapid cooling technologies, has the characteristics of good plasticity, strong forming capability, small resilience and the like at high temperature through hot forming, and can reach high strength through rapid cooling. The hot formed manganese boron steel is generally a ferrite-pearlite structure in an initial state and has a strength of about 500 to 600 MPa. The martensitic structure can be adjusted by press quenching, i.e. by heating to austenitizing temperature and subsequent rapid cooling in a die press, so that a tensile strength in the range of 1500 to 2000MPa is achieved. The requirements of strength and plasticity of the automobile safety structural part are met. Compared with the traditional aluminum-silicon coating manganese-boron steel, the thin aluminum-silicon coating manganese-boron steel has the characteristics of better toughness and the like.
The laser tailor-welded blank made of the hot-formed manganese boron steel can reduce the weight of an automobile body, improve the collision safety and optimize the cost by combining two lightweight technologies. However, in the welding process of the hot-formed manganese boron steel laser tailor-welded blank, the parent metal is subjected to complex chemical and physical metallurgical processes under the action of laser heat, and the aluminum-silicon coating on the surface of the parent metal is dissolved or melted, so that a continuous iron-aluminum phase structure is formed in a welding seam area of a welding joint, a large amount of brittle phases are generated in the subsequent hot working process, and the strength and the plasticity of the welding joint are seriously reduced. In the prior art, the influence of a plating layer on the strong plasticity of a welding seam is usually solved by adopting a plating layer corrosion technology and a method for improving the components of a welding wire, but the problems of low efficiency and high cost exist.
Disclosure of Invention
The invention aims to solve the technical problem that the strength and plasticity of a welding joint are seriously reduced when the hot-formed manganese boron steel is subjected to laser tailor welding in the prior art, and provides a welding wire and a welding method for improving the performance of the thin aluminum silicon coating hot-formed manganese boron steel welding joint.
The technical scheme adopted by the invention for solving the technical problems is as follows.
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.06wt% -0.2wt% of C, 0.5wt% -0.9wt% of Si, 1.5wt% -1.9wt% of Mn, 0.2wt% -0.6wt% of Cr, 1.4wt% -2.6wt% of Ni, 0.25wt% -0.6wt% of Mo, and the balance of iron and inevitable impurities;
and the weight percent of Mn is at least twice the weight percent of Si;
the weight percentage of C satisfies C Carbon (C) ≤0.5*0.5*（C Carbon 1 +C Carbon 2 ），C Carbon (C) Represents the weight percentage of C in the welding wire, C Carbon 1 、C Carbon 2 Respectively being the weight percentage of C in the two workpieces to be welded;
the weight percentage of Ni is at least 10 times the weight percentage of Ni of each workpiece to be welded.
Preferably, the welding wire includes 0.1wt% of C, 0.5wt% of Si, 1.5wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
Preferably, the welding wire includes 0.1wt% of C, 0.9wt% of Si, 1.9wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
Preferably, the welding wire includes 0.1wt% of C, 0.79wt% of Si, 1.76wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
Preferably, the diameter of the welding wire is 0.6mm to 1.6mm, and more preferably, the diameter of the welding wire is 0.8mm to 1.2mm.
Preferably, the outer surface of the welding wire is metallized; more preferably, the outer surface of the wire is plated with copper.
The invention relates to a welding method for improving the performance of a thin aluminum silicon coating hot forming manganese boron steel welding joint, which comprises the following steps: installing a welding wire on a laser welding device, starting the laser welding device, setting welding parameters, placing a position to be welded of a workpiece to be welded on a welding station, performing laser welding to form a weld bead, and finishing welding, wherein the workpiece to be welded is made of thin aluminum silicon coating hot-formed manganese boron steel.
Preferably, before welding, the edges to be welded of two workpieces to be welded are butted together, the maximum butting gap is 0.3mm, and the edges to be welded are straight lines or curved arcs.
Preferably, the thickness of the workpiece to be welded is 0.8mm to 5mm, and more preferably, the thickness of the workpiece to be welded is 1mm to 3mm.
Preferably, the single-side weight of the thin aluminum-silicon coating of the Bao Lvgui coating hot-formed manganese-boron steel is less than or equal to 40g/m 2 。
Preferably, the thickness of the single side of the thin aluminum-silicon coating of the Bao Lvgui coating hot-formed manganese boron steel is less than or equal to 19 mu m.
Preferably, the material of the hot-formed manganese boron steel of the Bao Lvgui coating hot-formed manganese boron steel is 22MnB5.
Preferably, the workpiece to be welded is a plate or a coil.
Preferably, the laser welding is performed under an inert atmosphere; more preferably, when the laser welding laser source is a carbon dioxide laser, the inert atmosphere uses pure helium or a mixture of helium and argon in a volume ratio of 3:7, and when the laser welding laser source is a solid laser, the inert atmosphere uses pure argon or pure nitrogen.
Preferably, the welding wire is filled into the weld during welding by an automatic feeding device.
Preferably, the welding parameters are: the welding speed is 3-10m/min, the wire feeding speed is 1-10m/min, and the welding laser power is 1000-9000W.
More preferably, the welding parameters are: the welding speed is 5-8m/min, the wire feeding speed is 2.5-6m/min, and the welding laser power is 4000-7000W.
Compared with the prior art, the invention has the following beneficial effects:
1. the welding wire for improving the performance of the thin aluminum-silicon coating hot-formed manganese boron steel welding joint can prevent the welding wire from being embrittled and realize better residual strain at a welding seam.
2. The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint does not need to carry out pretreatment such as ablation removal on the surface of the thin aluminum silicon coating, directly applies welding wires, reduces manufacturing links, is convenient for workers to weld, improves the working efficiency, reduces the processing difficulty and also reduces the welding manufacturing cost.
3. The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint does not need to reserve a specific gap, and only needs to meet the manufacturing precision of a universal tailor-welded blank, the welding wire enters a molten pool generated by a laser beam in the laser welding process, and the alloy elements contained in the welding wire are beneficial to forming austenite in the molten pool.
4. The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint directly adopts a laser wire filling welding process to weld a steel plate, and tests show that after a welding blank welded according to the method disclosed by the invention is subjected to hot stamping and quenching, the tensile strength of the welding joint is not lower than that of a base metal, and the tensile strength of the welding joint is not less than 1450Mpa by taking a 22MnB5 base material as an example.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of example 1 of the present invention after heat treatment stretching, wherein a is a microscopic structure diagram, and b is a metallographic macroscopic structure diagram.
Fig. 2 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of example 2 of the present invention after heat treatment stretching, a is a microstructure diagram, and b is a metallographic macroscopic diagram.
Fig. 3 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method in example 3 of the present invention after heat treatment and stretching, where a is a microstructure diagram and b is a metallographic macroscopic diagram.
Fig. 4 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of comparative example 1 of the present invention after heat treatment stretching, a is a microscopic structure diagram, and b is a metallographic macroscopic structure diagram.
Fig. 5 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of comparative example 2 of the present invention after heat treatment stretching, a is a microscopic structure diagram, and b is a metallographic macroscopic structure diagram.
Fig. 6 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of comparative example 3 of the present invention after heat treatment stretching, a is a microscopic structure diagram, and b is a metallographic macroscopic structure diagram.
Fig. 7 is a metallographic structure diagram of a welded joint of a welded blank obtained by the welding method of comparative example 4 of the present invention after heat treatment stretching, a is a microscopic structure diagram, and b is a metallographic macroscopic structure diagram.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention, but it is to be understood that the description is intended to illustrate further features and advantages of the invention, and not to limit the scope of the claims.
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.06wt% -0.2wt% of C, 0.5wt% -0.9wt% of Si, 1.5wt% -1.9wt% of Mn, 0.2wt% -0.6wt% of Cr, 1.4wt% -2.6wt% of Ni, 0.25wt% -0.6wt% of Mo, and the balance of iron and inevitable impurities; and the weight percent of Mn is at least twice the weight percent of Si; c Carbon (C) The weight percentage of (B) satisfies C Carbon (C) ≤0.5*0.5*（C Carbon 1 +C Carbon 2 ），C Carbon (C) Represents the weight percentage of C in the welding wire, C Carbon 1 、C Carbon 2 Respectively in two work pieces to be weldedC weight percentage; the weight percentage of Ni is at least 10 times the weight percentage of Ni of each workpiece to be welded.
The present embodiment provides several preferred wire compositions, but is not so limited. The preferred wire includes 0.1wt% C, 0.5wt% Si, 1.5wt% Mn, 0.35wt% Cr, 2.2wt% Ni, 0.55wt% Mo, and the balance iron and unavoidable impurities. Alternatively, the wire includes 0.1wt% of C, 0.9wt% of Si, 1.9wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities. Alternatively, the wire includes 0.1wt% of C, 0.79wt% of Si, 1.76wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
In the technical scheme, the diameter of the welding wire is preferably 0.6mm-1.6mm, and more preferably 0.8mm-1.2mm; the outer surface of the welding wire may be uncoated or may be coated with a metal, preferably copper.
The invention relates to a welding method for improving the performance of a thin aluminum silicon coating hot forming manganese boron steel welding joint, which comprises the following steps: and installing a welding wire on the laser welding equipment, starting the laser welding equipment, setting welding parameters, placing the position to be welded of the workpiece to be welded on a welding station, performing laser welding to form a welding bead, obtaining a welding blank, and finishing welding.
In the technical scheme, the workpiece to be welded is made of thin aluminum silicon coating hot-formed manganese boron steel. Among them, the hot-formed manganese boron steel (base material) is not particularly limited, and the manganese boron steel used for the hot press-quenched material may be any, and is preferably 22MnB5; the thickness of the hot-formed manganese boron steel plate is preferably 0.8mm-5mm, and more preferably 1mm-3mm; the weight of the single side of the Bao Lvgui coating is preferably less than or equal to 40g/m 2 And the thickness of the single surface is less than or equal to 19 mu m. The form of the workpiece to be welded is not particularly limited, and may be a plate or a coil. The two workpieces to be welded may be identical or different (different material grades, different thicknesses, different rolling methods, etc.).
In the technical scheme, laser welding is carried out in an inert atmosphere; when the laser source for laser welding is a carbon dioxide laser, pure helium or a mixture of helium and argon in a volume ratio of 3:7 is used as the inert atmosphere, and when the laser source for laser welding is a solid laser, pure argon or pure nitrogen is used as the inert atmosphere.
In the technical scheme, the welding wires are preferably coiled and packaged and are filled into the welding seams in the welding process through the automatic feeding device.
In the above technical solution, the preferable welding parameters are: the welding speed is 3-10m/min, the wire feeding speed is 1-10m/min, and the welding laser power is 1000-9000W; more preferably, the welding speed is 5m/min, the wire feeding speed is 2.5m/min, and the welding laser power is 5000W.
The terms used in the present invention generally have meanings commonly understood by those of ordinary skill in the art, unless otherwise specified. In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the following embodiments.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art. Materials, reagents, devices, instruments, apparatuses and the like used in the following examples are commercially available unless otherwise specified.
The present invention is further illustrated by the following examples.
Example 1
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.1wt% of C, 0.5wt% of Si, 1.5wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
selecting thin aluminum silicon coating hot forming manganese boron steel plates VP1 and VP2, wherein the VP1 and VP2 are plates with the same size, the same material and the same thickness, the VP1 and VP2 are plates with the size of 300mm in length, 300mm in width and 1.6mm in thickness, the hot forming manganese boron steel plate is made of 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
Selecting one edge of VP1 and VP2 as an edge to be welded, cleaning the edge to be welded without impurities, installing a welding wire on a laser welding device, starting the laser welding device, setting welding parameters, setting the diameter of the welding wire to be 1.0mm, the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edge to be welded of VP1 and VP2 at a welding station, performing laser wire filling welding to form a welding bead, obtaining a welding blank, and finishing welding.
Example 2
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.1wt% of C, 0.9wt% of Si, 1.9wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
selecting thin aluminum silicon coating hot forming manganese boron steel plates VP1 and VP2, wherein the VP1 and VP2 are plates with the same size, the same material and the same thickness, the VP1 and VP2 are plates with the size of 300mm in length, 300mm in width and 1.6mm in thickness, the hot forming manganese boron steel plate is made of 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
Selecting one edge of VP1 and VP2 as an edge to be welded, cleaning the edge to be welded without impurities, installing a welding wire on a laser welding device, setting the straightness of the edge to be welded to be less than or equal to 0.1mm, starting the laser welding device, setting welding parameters, setting the diameter of the welding wire to be 1.0mm, the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edge to be welded of VP1 and VP2 on a welding station, carrying out laser wire filling welding to form a welding bead, obtaining a welding blank, and finishing welding.
Example 3
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.1wt% of C, 0.79wt% of Si, 1.76wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
step one, selecting thin aluminum-silicon coating hot-formed manganese-boron steel plates VP1 and VP2, wherein VP1 and VP2 are the sameThe size, the material quality and the thickness of the plate are the same, the size of VP1 and VP2 is 300mm in length, 300mm in width and 1.6mm in thickness, the material of the hot-formed manganese boron steel plate is 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
Selecting one edge of VP1 and VP2 as an edge to be welded, cleaning the edge to be welded without impurities, installing a welding wire on a laser welding device, setting the straightness of the edge to be welded to be less than or equal to 0.1mm, starting the laser welding device, setting welding parameters, setting the diameter of the welding wire to be 1.0mm, the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edge to be welded of VP1 and VP2 on a welding station, carrying out laser wire filling welding to form a welding bead, obtaining a welding blank, and finishing welding.
Comparative example 1
Selecting thin aluminum silicon coating hot forming manganese boron steel plates VP1 and VP2, wherein the VP1 and VP2 are plates with the same size, the same material and the same thickness, the VP1 and VP2 are plates with the size of 300mm in length, 300mm in width and 1.6mm in thickness, the hot forming manganese boron steel plate is made of 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
And step two, selecting one edge of the VP1 and the VP2 as an edge to be welded, enabling the straightness of the edge to be welded to be less than or equal to 0.1mm, enabling the edge to be welded to be clean and free of impurities, starting laser welding equipment, setting welding parameters, setting the welding speed to be 5m/min, enabling the welding laser power to be 4300W, respectively placing the edge to be welded of the VP1 and the edge to be welded of the VP2 to be welding stations, carrying out laser welding (without welding wires), forming a welding bead, obtaining a welding blank, and finishing welding.
Comparative example 2
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.1wt% of C, 0.45wt% of Si, 1.1wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
step one, selecting thin aluminum-silicon coating hot-formed manganese-boron steel plates VP1 and VP2, wherein the VP1 and the VP2 are plates with the same size, the same material and the same thickness, and the VP1 and the VP2VP2 is 300mm long, 300mm wide and 1.6mm thick, the material of hot-formed Mn-B steel plate is 22MnB5, and the weight of single side of thin aluminum-silicon coating is 35g/m 2 ；
Selecting one edge of VP1 and VP2 as an edge to be welded, enabling the straightness of the edge to be welded to be less than or equal to 0.1mm, enabling the edge to be welded to be clean and free of impurities, installing a welding wire on a laser welding device, enabling the diameter of the welding wire to be 1.0mm, starting the laser welding device, setting welding parameters, enabling the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edges to be welded of VP1 and VP2 on welding stations, conducting laser wire filling welding, forming a welding bead, obtaining a welding blank, and completing welding.
Comparative example 3
A welding wire for improving the performance of a thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.1wt% of C, 0.9wt% of Si, 1.35wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
selecting thin aluminum silicon coating hot forming manganese boron steel plates VP1 and VP2, wherein the VP1 and VP2 are plates with the same size, the same material and the same thickness, the VP1 and VP2 are plates with the size of 300mm in length, 300mm in width and 1.6mm in thickness, the hot forming manganese boron steel plate is made of 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
And step two, selecting one edge of the VP1 and the VP2 as an edge to be welded, enabling the straightness of the edge to be welded to be less than or equal to 0.1mm, enabling the edge to be welded to be clean and free of impurities, installing a welding wire on a laser welding device, enabling the diameter of the welding wire to be 1.0mm, starting the laser welding device, setting welding parameters, enabling the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edge to be welded of the VP1 and the edge to be welded of the VP2 on a welding station, carrying out laser wire filling welding, forming a welding bead, obtaining a welding blank, and completing welding.
Comparative example 4
The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises 0.076wt% of C, 0.68wt% of Si, 1.46wt% of Mn, 0.35wt% of Cr, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
The welding method for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint comprises the following steps:
selecting thin aluminum silicon coating hot forming manganese boron steel plates VP1 and VP2, wherein the VP1 and VP2 are plates with the same size, the same material and the same thickness, the VP1 and VP2 are plates with the size of 300mm in length, 300mm in width and 1.6mm in thickness, the hot forming manganese boron steel plate is made of 22MnB5, and the weight of the single side of the thin aluminum silicon coating is 35g/m 2 ；
Selecting one edge of VP1 and VP2 as an edge to be welded, enabling the straightness of the edge to be welded to be less than or equal to 0.1mm, enabling the edge to be welded to be clean and free of impurities, installing a welding wire on a laser welding device, enabling the diameter of the welding wire to be 1.0mm, starting the laser welding device, setting welding parameters, enabling the welding speed to be 5m/min, the wire feeding speed to be 2.5m/min and the welding laser power to be 5000W, respectively placing the edges to be welded of VP1 and VP2 on welding stations, conducting laser wire filling welding, forming a welding bead, obtaining a welding blank, and completing welding.
The properties of the welded joints of examples 1 to 3 and comparative examples 1 to 4 were examined. The detection method comprises the following steps: cutting a welding blank into a dumbbell-shaped sample of A50 standard according to GB/T228 'Metal Material Room temperature tensile test method', heating the sample to 930 ℃, preserving heat for 5 minutes, transferring the sample to a mould with cooling water circulating inside within 6-8 seconds to compact the sample (pressure-maintaining cooling is carried out for 15 seconds, the nominal force of the press is 1000 KN), cooling the sample at a speed of more than 30 ℃/S, and adopting the maximum test force: the sample was subjected to tensile test using a universal tensile machine of 200 kN. Firstly, the mechanical properties of the hot-formed manganese boron steel plate are measured, and the tensile strength, the yield strength and the elongation percentage of the hot-formed manganese boron steel plate are respectively higher than 1450Mpa, 950Mpa and 4% or more. The mechanical properties of the welded joint were then measured, with the welded joint in the middle of the test specimen and the bead direction perpendicular to the direction of the tensile force applied in the test. And finally, detecting the metallographic structure of the welded joint. The mechanical test results are shown in Table 1, and the metallographic structure photographs are shown in FIGS. 1 to 7.
TABLE 1 weldability of the weld parts of examples 1-3 and comparative examples 1-4
As can be seen from Table 1, the weld joints obtained by the welding methods of examples 1-3 have tensile strength higher than 1450MPa, yield strength higher than 950MPa, and elongation greater than or equal to 4%, and meet the requirements.
The metallographic structures of the welded joints of examples 1 to 3 are shown in fig. 1 to 3, respectively, and are martensite structures, and meet the requirements. The metallographic structure of the welded joints of comparative examples 1 to 4 is a mixed structure of ferrite, martensite and bainite as shown in FIGS. 4 to 7, and is unsatisfactory. The addition of the welding wire can effectively dilute the aluminum element brought into a molten pool by a coating, and the specific components in the welding wire can ensure that a welding joint is completely transformed into a martensite structure after heat treatment, and the martensite structure has high strength and meets the use requirement.
Through the specific embodiment, the condition that the sum of the weight percentages of two element components including Si and Mn contained in the welding wire is between 2.0% and 2.8%, the weight percentage of the Mn element is at least twice of the weight percentage of the Si element, and the weight percentage of C satisfies the condition that C Carbon (C) ≤0.5*0.5*（C Carbon 1 +C Carbon 2 ），C Carbon (C) Represents the weight percentage of C in the welding wire, C Carbon 1 、C Carbon 2 The weight percentage of the carbon in the two workpieces to be welded is respectively, and the weight percentage of the Ni is at least 10 times of the weight percentage of the Ni of each workpiece to be welded, so that the welding joint of the thin aluminum silicon coating hot forming steel has good performance, and can meet the requirement of mass production; under the condition of laser welding without wire filling, the thin aluminum-silicon coating hot forming steel has poor welding performance and does not meet the requirement of mass production.
It should be understood that the above-described embodiments are merely examples for clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither necessary nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The welding wire for improving the performance of the thin aluminum silicon coating hot forming manganese boron steel welding joint is characterized by comprising 0.06wt% -0.2wt% of C, 0.5wt% -0.9wt% of Si, 1.5wt% -1.9wt% of Mn, 0.2wt% -0.6wt% of Cr, 1.4wt% -2.6wt% of Ni, 0.25wt% -0.6wt% of Mo, and the balance of iron and inevitable impurities;
and the weight percent of Mn is at least twice the weight percent of Si;
the weight percentage of C satisfies C Carbon (C) ≤0.5*0.5*（C Carbon 1 +C Carbon 2 ），C Carbon (C) Represents the weight percentage of C in the welding wire, C Carbon 1 、C Carbon 2 Respectively the weight percentage of C in the two workpieces to be welded;
the weight percentage of Ni is at least 10 times the weight percentage of Ni of each workpiece to be welded.
2. The welding wire for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint according to claim 1, characterized in that the welding wire comprises 0.1wt% of C, 0.5wt% of Si, 1.5wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, the balance being iron and unavoidable impurities;
or, the welding wire comprises 0.1wt% of C, 0.9wt% of Si, 1.9wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities;
alternatively, the wire includes 0.1wt% of C, 0.79wt% of Si, 1.76wt% of Mn, 0.35wt% of Cr, 2.2wt% of Ni, 0.55wt% of Mo, and the balance of iron and inevitable impurities.
3. The welding wire for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint as claimed in claim 1, wherein the diameter of the welding wire is 0.6mm to 1.6mm.
4. The welding wire for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint according to claim 3, wherein the diameter of the welding wire is 0.8mm to 1.2mm.
5. The welding wire for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint as claimed in claim 1, wherein the outer surface of said welding wire is metallized.
6. The welding wire for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint according to claim 5, wherein the outer surface of the welding wire is plated with copper.
7. A welding method for improving the performance of a welding joint of thin aluminum silicon coated hot forming manganese boron steel by using the welding wire as defined in any one of claims 1 to 6, characterized by installing the welding wire on a laser welding device, starting the laser welding device, setting welding parameters, placing a position to be welded of a workpiece to be welded on a welding station, performing laser welding to form a welding bead, and completing welding; the material of the workpiece to be welded is thin aluminum-silicon coating hot-formed manganese boron steel.
8. A welding method for improving the performance of a welded joint of a thin aluminum-silicon coated hot formed manganese boron steel according to claim 7, characterized in that before welding, the edges to be welded of two workpieces to be welded are butted together, the maximum butt gap is 0.3mm, and the edges to be welded are straight lines or curved arcs;
the thickness of the workpiece to be welded is 0.8mm-5mm;
the weight of the single side of the thin aluminum-silicon coating of the Bao Lvgui coating hot-formed manganese boron steel is less than or equal to 40g/m 2 ；
The thickness of the single side of the thin aluminum-silicon coating of the Bao Lvgui coating hot-formed manganese boron steel is less than or equal to 19 mu m;
the workpiece to be welded is a plate or a coiled material.
9. The welding method for improving the performance of a thin aluminum silicon coated hot formed manganese boron steel weld joint according to claim 7,
performing laser welding in an inert atmosphere;
and the welding wire is filled into the welding seam in the welding process through the automatic feeding device.
10. The welding method for improving the performance of the thin aluminum silicon coated hot formed manganese boron steel weld joint according to claim 7, characterized in that the welding parameters are as follows: the welding speed is 3-10m/min, the wire feeding speed is 1-10m/min, and the welding laser power is 1000-9000W.
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| US20220258283A1 (en) * | 2019-07-12 | 2022-08-18 | Salzgitter Europlatinen GmbH | Method for producing a coated tailored welded blank by means of laser-beam welding or hybrid laser/gas-metal-arc welding and filler wire and use thereof for this purpose |
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| CN103831532A (en) * | 2014-03-05 | 2014-06-04 | 中国科学院等离子体物理研究所 | Laser welding process for 316LN large gap butt welding |
| CN111050980A (en) * | 2017-08-31 | 2020-04-21 | 宝钢激光拼焊(德国)有限公司 | Method for laser ray welding one or more manganese boron steel plates capable of being press-quenched |
| CN109877449A (en) * | 2019-03-13 | 2019-06-14 | 上海交通大学 | A kind of method that coating manganese boron plate obtains full martensite welding assembly |
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