CN114918544A - Laser CMT (constant current time) joint welding method suitable for thin arm support of overhead working truck - Google Patents

Laser CMT (constant current time) joint welding method suitable for thin arm support of overhead working truck Download PDF

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Publication number
CN114918544A
CN114918544A CN202210540144.0A CN202210540144A CN114918544A CN 114918544 A CN114918544 A CN 114918544A CN 202210540144 A CN202210540144 A CN 202210540144A CN 114918544 A CN114918544 A CN 114918544A
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China
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welding
laser
cmt
arm support
working truck
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Inventor
滕彬
武鹏博
徐锴
黄瑞生
赵德民
方乃文
邹吉鹏
韩鹏薄
周坤
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Harbin Research Institute of Welding
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Harbin Research Institute of Welding
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Priority to CN202210540144.0A priority Critical patent/CN114918544A/en
Publication of CN114918544A publication Critical patent/CN114918544A/en
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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
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/0869—Devices involving movement of the laser head in at least one axial direction
    • B23K26/0876—Devices involving movement of the laser head in at least one axial direction in at least two axial directions
    • 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
    • B23K26/70—Auxiliary operations or equipment

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

A laser CMT (CMT) combined welding method suitable for a thin arm support of an overhead working truck belongs to the technical field of welding and solves the problems of large deformation of the thin arm support of the overhead working truck after welding, low welding efficiency and poor welding quality stability in the prior art. The method of the invention comprises the following steps: fixing the relative position and posture of a laser head and a CMT welding gun by using a clamp, so that an included angle between a laser beam emitted by the laser head and the normal direction of the surface of a plate to be welded is 5-15 degrees, an included angle between the CMT welding gun and the laser beam is 40-50 degrees, the distance between a molten pool formed by the CMT welding gun and the center of the molten pool formed by the laser beam is 5-10 mm, and the laser beam is positioned in front of the welding movement; and controlling the clamp carrying the laser head and the CMT welding gun to move along the welding line through a driving device to realize welding. The welding method is suitable for welding the thin arm support of the overhead working truck.

Description

Laser CMT (constant current machine) combined welding method suitable for thin arm support of overhead working truck
Technical Field
The application relates to the technical field of welding, in particular to a laser CMT (constant current time) joint welding method suitable for a thin arm support of an overhead working truck.
Background
The high-altitude operation vehicle is a manned aerial operation device, the structure of which comprises a vehicle body, an arm support, a working platform leveling device and a working platform, and the high-altitude operation vehicle is mainly applied to the fields of high-altitude operation, equipment installation and maintenance, fire rescue and the like in various industries.
The arm support is an important part of the overhead working truck, and the welding quality of the arm support directly influences the reliability and the use safety of the overhead working truck device. In the design and production process, in order to reduce the weight of the whole vehicle and improve the utilization rate of the chassis, a thinner steel plate is usually selected as a material on the premise of ensuring the strength of the arm support. The thin arm support is easy to deform after being welded. In the production process, the requirement on the form and position tolerance precision of the arm support is high, and if the arm support deforms, the form and position tolerance of the structure is directly changed, so that the product quality is reduced.
At present, the common welding of the thin arm support is mainly MAG welding, the welding method has the advantages of good welding quality, small oil rust sensitivity, good crack resistance and the like, but has the problems of low welding efficiency and relatively large deformation, although the welding method is a thin-wall structural member, the welding method is limited by the welding characteristics of MAG welding, the weld penetration is small, groove processing is required before welding, the welding production efficiency is greatly restricted, meanwhile, the incomplete penetration phenomenon easily occurs in the welding process, deformation correction is required after welding, but the structural stress is correspondingly increased after the correction after welding, and the bearing capacity of the structure is reduced.
Therefore, the development of a high-quality, high-efficiency and low-deformation welding method suitable for the thin arm support of the overhead working truck is of great significance.
Disclosure of Invention
The invention aims to solve the problems of large deformation of a thin arm support of an overhead working truck after welding, low welding efficiency and poor welding quality stability in the prior art, and provides a laser CMT (constant current time) combined welding method suitable for the thin arm support of the overhead working truck.
The invention is realized by the following technical scheme, and provides a laser CMT joint welding method suitable for a thin arm support of an overhead working truck, wherein in the method, a relative position and a posture of a laser head and a CMT welding gun are fixed by using a clamp, so that an included angle between a laser beam emitted by the laser head and the normal direction of the surface of a plate to be welded is 5-15 degrees, an included angle between the CMT welding gun and the laser beam is 40-50 degrees, the distance between a molten pool formed by the CMT welding gun and the center of the molten pool formed by the laser beam is 5-10 mm, and the laser beam is positioned in front of welding movement;
and controlling the clamp to carry the laser head and the CMT welding gun to move along the welding line through a driving device to realize welding.
Further, in the method, before welding, step 1, cleaning the welding line and the periphery of the to-be-welded high-altitude operation vehicle arm frame, and fixing the to-be-welded high-altitude operation vehicle arm frame on a special welding tool fixture.
Further, in the method, the laser parameters are 2kW to 5kW of laser power, the defocusing amount is between-5 mm and +5mm, the welding speed is between 0.8m/min and 1.5m/min, the wire feeding speed is between 1m/min and 5m/min, the welding current is between 50A and 150A, and the arc length correction coefficient is between-5 percent and 5 percent;
the protective gas flow is 20L/min-30L/min.
Further, step 1 is preceded by: and checking the states of the laser generator, the CMT welding machine and the motion system, if the next step is normally executed, otherwise, carrying out fault detection or maintenance on the laser generator, the CMT welding machine and the motion system.
Furthermore, the welding mode is transverse welding.
Furthermore, the to-be-welded aerial working truck arm frame is of a square structure formed by butt joint of two groove-shaped plates, a group of CMT welding guns and a group of laser beams are respectively arranged at welding seams on two sides of the to-be-welded aerial working truck arm frame, and the two groups of CMT welding guns and the two groups of laser beams synchronously move and are welded at the same time.
Further, the included angle between the laser beam and the normal direction of the surface of the test board is 10 degrees, the included angle between the CMT welding gun and the laser beam is 45 degrees, and the distance between the CMT welding gun and the laser beam is 6 mm.
Furthermore, the laser parameters are 3kW to 5kW of laser power, the defocusing amount is minus 5mm to +5mm, the welding speed is 0.8m/min to 1.2m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is minus 1 percent to 2 percent;
the protective gas flow is 20L/min-30L/min.
Furthermore, the laser parameters are 3kW to 4kW of laser power, the defocusing amount is minus 5mm to plus 5mm, the welding speed is 0.8m/min to 1.0m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is 0 percent to 2 percent;
the protective gas flow is 20L/min-30L/min.
Further, the laser parameters are 4kW of laser power, +2mm of defocusing amount, 1.0m/min of welding speed, 3.5m/min of wire feeding speed, 100A of welding current and 2% of arc length correction coefficient;
the parameters of the protective gas are 80% Ar + 20% CO 2 The protective gas flow is 25L/min.
The invention has the beneficial effects that:
the invention provides an efficient and low-deformation welding method suitable for a thin arm support of an overhead working truck, which is based on the problems. The beneficial effects are as follows:
(1) the laser-CMT combined welding method is adopted to make up the limitation of laser on the assembly clearance of the workpiece in the welding process, the working condition adaptability is improved, the penetration of the welding seam is increased under the action of the laser, the good one-side welding and two-side forming welding effect can be realized, and the defects of lack of penetration and the like in the existing MAG welding arc welding process are overcome;
(2) the effective combination of two heat sources in the laser-CMT combined welding method improves the welding efficiency by more than one time compared with the existing MAG method;
(3) the cantilever crane double-sided synchronous welding is adopted, namely two sets of laser-CMT combined arc welding devices are adopted, so that the workpieces are heated relatively uniformly in the welding process, the welding deformation is greatly reduced, and the deformation is reduced by more than 30% compared with the traditional MAG welding;
(4) the transverse welding mode is adopted for welding, so that the secondary overturning of a welding workpiece is avoided on the premise of ensuring the stability of penetration in the welding process, and the welding efficiency is further improved;
(5) in the aspect of joint quality, the joint action mode of laser and CMT electric arc is small in welding heat input and fine in structure, the tensile property of a welding joint is greatly improved, and the safety performance of the high-altitude operation thin arm frame is further improved.
The invention realizes the high-quality, high-efficiency and low-deformation welding of the high-altitude operation thin cantilever crane, reduces the welding cost, and can meet the industrial use requirements on the performance and the deformation of the welding joint.
The welding method is suitable for welding the thin arm support of the overhead working truck.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of butt and angle I-grooves;
FIG. 2 is a schematic view of laser-CMT electric arc welding cross welding;
FIG. 3 is a schematic view of welding a thin arm frame of the aerial cage;
FIG. 4 is a single-side welding and double-side forming effect diagram of a 3mm butt-joint test plate;
FIG. 5 is a graph showing a comparison of the welding deformation of thin plates.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. The description and claims do not intend to distinguish between components that differ in noun but not in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the present invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
The thin arm frame structure of the high-altitude operation vehicle is a square structure and is formed by butting two trough-shaped plates, and the structural schematic diagram is shown in figure 3.
In the method, a clamp is utilized to fix the relative position and posture of a laser head and a CMT welding gun, so that an included angle between a laser beam emitted by the laser head and the normal direction of the surface of a plate to be welded is 5-15 degrees, an included angle between the CMT welding gun and the laser beam is 40-50 degrees, the distance between a molten pool formed by the CMT welding gun and the center of the molten pool formed by the laser beam is 5-10 mm, and the laser beam is positioned in front of the welding movement;
and controlling the clamp to carry the laser head and the CMT welding gun to move along the welding line through a driving device to realize welding.
The embodiment provides a high-quality, high-efficiency and low-deformation welding method suitable for a thin arm support of an overhead working truck.
The embodiment effectively combines the laser welding method and the CMT electric arc welding method, makes up the limitation of the laser on the assembly clearance of the workpiece in the welding process, improves the working condition adaptability, increases the penetration of the welding seam by introducing the laser, can realize good single-side welding double-side forming, and solves the problem of the defects of incomplete penetration and the like in the existing MAG welding electric arc welding process.
The welding method can effectively improve the welding quality, greatly reduce the welding deformation and avoid dangerous accidents in the operation process of the overhead working truck.
The embodiment adjusts the included angle between the laser beam and the normal direction of the surface of the test plate, the included angle between the CMT welding gun and the laser beam and the distance between the CMT welding gun and the laser beam so as to realize the combined welding mode of the CMT welding gun and the laser beam, the laser and the CMT electric arc adopt the combined form, the separation of a laser molten pool and an electric arc molten pool is realized, the welding deformation is further reduced, the workpiece is melted by the laser in principle, and the heat action of the workpiece ensures the effective spreading of the molten metal in the CMT electric arc at a high speed state;
during welding, the laser melts the workpiece in front, and then the CMT electric arc acts on the workpiece, so that the laser and the CMT electric arc form a front molten pool and a rear molten pool. By means of the characteristics of laser energy concentration and deep fusion welding, the penetration effect of the test piece is realized, and meanwhile, the heat effect of the laser on the test piece provides partial heat for the spreading of a subsequent CMT arc molten pool, so that the stable welding and molten pool spreading of the CMT arc at high speed are realized. The CMT arc welding mode is one of consumable electrode gas shielded welding, a welding wire is used as an electrode to be melted and enters a workpiece, the welding wire is filled in a test piece, and meanwhile, the cold metal transition mode of the CMT arc is low in welding heat input and beneficial to reduction of deformation in the welding process.
It should be noted that the thickness of the arm support applicable to this embodiment is 1mm to 4 mm; the groove structure of the arm support is an I-shaped butt joint groove, in addition, the method is also suitable for the fillet weld form in the arm support, the groove structure is also a straight-side structure, and the groove structure is shown in figure 1.
In the second embodiment, the laser CMT joint welding method for the thin boom of the overhead working truck in the first embodiment is further limited, and in the method, before welding, the step 1 of cleaning the welding line and the periphery of the boom of the overhead working truck to be welded is performed, and the boom of the overhead working truck to be welded is fixed on a special welding tool fixture.
The present embodiment is a preparatory work for the operation of the welder, and can achieve effective welding.
In a third embodiment, the present invention is further limited to the method for laser CMT joint welding of a thin boom of an aerial work platform, according to the first embodiment, wherein the laser parameters are 2kW to 5kW of laser power, the defocusing amount is-5 mm to +5mm, the welding speed is 0.8m/min to 1.5m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is-5% to 5%;
the protective gas flow is 20L/min-30L/min.
In a fourth embodiment, the present embodiment is a further limitation on the laser CMT joint welding method for a thin boom of an aerial work platform in the second embodiment, and before the step 1, the method further includes: and checking the states of the laser generator, the CMT welding machine and the motion system, if the next step is normally executed, otherwise, carrying out fault detection or maintenance on the laser generator, the CMT welding machine and the motion system.
The embodiment can realize normal welding work and avoid welding errors caused by faults of the laser generator, the CMT welding machine and the motion system.
In a fifth embodiment, the present embodiment is a further limitation on the laser CMT joint welding method for a thin boom of an aerial work platform, which is described in the first embodiment, and in the present embodiment, the further limitation is made on the welding method, specifically including: the welding mode is transverse welding.
In this embodiment, as shown in fig. 2, the arrow direction is the welding direction, and the welding mode of horizontal welding is adopted, so that the formation of the back of the weld joint is ensured to be uniform and stable on the premise of ensuring the stability of penetration in the welding process, the secondary overturning of a welding workpiece is structurally avoided, and the welding efficiency is improved.
In a sixth implementation manner, the third implementation manner further defines that the laser CMT combined welding method for the thin arm support of the overhead working truck is a square structure formed by two groove-shaped plates in butt joint, a set of CMT welding gun and a set of laser beam are respectively arranged at the welding seams at two sides of the arm support of the overhead working truck to be welded, and the two sets of CMT welding guns and the laser beam move synchronously and are welded simultaneously.
As shown in fig. 3, the positions of the two welds are symmetrical.
In the embodiment, the back of the welding seam is ensured to be formed uniformly and stably, meanwhile, a double-head mode is selected for the arm support structure, synchronous welding is adopted, the welding stress is ensured to be in a relatively balanced state, further, the welding deformation of the thin arm support structure is reduced, and a welding schematic diagram is shown in fig. 3.
In the embodiment, for the thin-wall structural member of the overhead working truck in the aspect of welding deformation, in order to further reduce the welding deformation, the method adopts arm support double-sided synchronous welding, namely two sets of laser-CMT combined arc welding devices are adopted, so that the workpiece is heated relatively uniformly in the welding process, and the welding deformation is greatly reduced.
In a seventh implementation manner, the implementation manner is to further limit the laser CMT joint welding method applicable to the thin arm support of the overhead working truck in the first implementation manner, and specifically includes:
the included angle between the laser beam and the normal direction of the surface of the test plate is 10 degrees, the included angle between the CMT welding gun and the laser beam is 45 degrees, and the distance between the CMT welding gun and the laser beam is 6 mm.
In an eighth embodiment, the present embodiment is a further limitation on the laser CMT joint welding method for a thin boom of an aerial work platform, which includes:
the laser parameters are 3kW to 5kW of laser power, the defocusing amount is-5 mm to +5mm, the welding speed is 0.8m/min to 1.2m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is-1% to 2%;
the protective gas flow is 20L/min-30L/min.
In a ninth implementation manner, the present implementation manner is to further limit the laser CMT joint welding method applicable to the thin boom of the overhead working truck in the first implementation manner, and specifically includes:
the laser parameters are 3kW to 4kW of laser power, the defocusing amount is-5 mm to +5mm, the welding speed is 0.8m/min to 1.0m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is 0 percent to 2 percent;
the protective gas flow is 20L/min-30L/min.
In a tenth embodiment, the present embodiment is a further limitation on the laser CMT joint welding method applied to the thin arm support of the overhead working truck in the first embodiment, and specifically includes:
the laser parameters are 4kW of laser power, the defocusing amount is +2mm, the welding speed is 1.0m/min, the wire feeding speed is 3.5m/min, the welding current is 100A, and the arc length correction coefficient is 2%;
the parameters of the protective gas are 80% Ar + 20% CO 2 The protective gas flow is 25L/min.
In an eleventh embodiment, the present embodiment is directed to an example of the laser CMT joint welding method applied to the thin boom of the overhead working truck in the first embodiment, and specifically includes:
in the embodiment, a 3 mm-thick overhead working thin arm support test plate is selected and is processed into an I-shaped butt joint groove. Specifically, a test plate to be welded is mechanically polished, cleaned for 15min by alcohol, washed by clean water and dried, and oil stains and oxides on the surface are removed. Clamping a test plate to be welded by using a clamp, and matching the protective gas flow rate with 80% Ar + 20% CO by using a protective gas flow rate proportioner 2 Protective gasThe flow rate is 25L/min; adjusting the included angle between the laser and the test plate to be 10 degrees, and adjusting the included angle between the laser and the welding gun to be 45 degrees; the welding process parameters are as follows: the laser power is 4kW, the defocusing amount is +2mm, the welding speed is 1.0m/min, the wire feeding speed is 3.5m/min, the welding current is 100A, the arc length correction coefficient is 2%, the spacing between optical wires is 6mm, and the welding material is HS-70 welding wire with the tensile property of 70 kg grade. And completing welding through the movement of the robot. The cross-sectional morphology of the welded joint is shown in fig. 4, wherein (a) is the front side, (b) is the back side, and (c) is the cross section, so that the welding seam is formed uniformly and stably in the front side, no undercut and other defects are generated, the single-side welding and double-side forming welding effect is realized, the width of a heat affected zone is relatively small as seen from the cross section, and the welding heat input is relatively low. Fig. 5 is a graph showing the comparison of the deformation of the welding joint and the MAG welding joint, wherein (a) is a schematic diagram of the welding effect of the laser-CMT hybrid welding method of the present invention, and (b) is a schematic diagram of the welding effect of the conventional MAG welding method.
The method provided by the patent achieves the following welding effects:
1) single-side welding and double-side forming welding effects: single-pass welding, the front and back of the welding line are formed evenly, and the defects of undercut, cracks and the like are not seen;
2) the welding speed is high, the welding efficiency is improved by more than one time, and the welding speed can reach more than 1 m/min;
3) the deformation after welding is small, which is about 30 percent of that of the traditional arc welding;
4) the front and back fusion widths of the welding seam are small, the heat damage of the welding joint is small, the tensile strength of the parent metal is 812MPa, and the joint strength is 756MPa, which reaches 92.65 percent of the parent metal.
5) The consumption of welding wire is obviously reduced.
Therefore, the effective combination of the welding method can be proved to remarkably improve the welding efficiency and reduce the deformation of the welding joint, and the welding method is feasible.
It should be noted that the laser swing mode and parameters selected by the present invention are not limited to the above parameters, and other welding parameters satisfying the welding conditions are applicable to this patent.
It should be noted that the laser swing method and parameters are not limited to the above parameters, and other welding parameters satisfying the welding conditions are applicable to the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention, and should be considered as within the scope of the present invention.

Claims (10)

1. A laser CMT combined welding method suitable for a thin arm support of an overhead working truck is characterized in that in the method, a clamp is used for fixing the relative position and posture of a laser head and a CMT welding gun, so that an included angle between a laser beam emitted by the laser head and the normal direction of the surface of a plate to be welded is 5-15 degrees, an included angle between the CMT welding gun and the laser beam is 40-50 degrees, the distance between a molten pool formed by the CMT welding gun and the center of the molten pool formed by the laser beam is 5-10 mm, and the laser beam is positioned in front of the welding movement;
and controlling the clamp to carry the laser head and the CMT welding gun to move along the welding line through a driving device to realize welding.
2. The laser CMT (CMT) joint welding method for the thin arm support of the overhead working truck as claimed in claim 1, wherein in the method, before welding, the step 1 of cleaning the welding seam and the periphery of the arm support of the overhead working truck to be welded and fixing the arm support of the overhead working truck to be welded on a special welding tool fixture.
3. The laser CMT (constant current time) combined welding method suitable for the thin arm support of the overhead working truck is characterized in that in the method, the laser parameters are 2kW to 5kW of laser power, the defocusing amount is-5 mm to +5mm, the welding speed is 0.8m/min to 1.5m/min, the wire feeding speed is 1m/min to 5m/min, the welding current is 50A to 150A, and the arc length correction coefficient is-5% to 5%;
the protective gas flow is 20L/min-30L/min.
4. The laser CMT (joint welding) method suitable for the thin arm support of the overhead working truck as claimed in claim 2, wherein the step 1 is preceded by: and checking the states of the laser generator, the CMT welding machine and the motion system, if the next step is normally executed, otherwise, carrying out fault detection or maintenance on the laser generator, the CMT welding machine and the motion system.
5. The laser CMT joint welding method for the thin boom of the overhead working truck as claimed in claim 1, wherein the welding mode is transverse welding.
6. The laser CMT joint welding method suitable for the thin arm support of the overhead working truck as claimed in claim 1, wherein the arm support of the overhead working truck to be welded is a square structure formed by butt joint of two trough plates, a group of CMT welding guns and a group of laser beams are respectively arranged at welding seams at two sides of the arm support of the overhead working truck to be welded, and the two groups of CMT welding guns and the laser beams synchronously move and are welded simultaneously.
7. The laser CMT joint welding method suitable for the thin arm support of the overhead working truck as claimed in claim 1, wherein the included angle between the laser beam and the normal direction of the surface of the test plate is 10 degrees, the included angle between the CMT welding gun and the laser beam is 45 degrees, and the distance between the CMT welding gun and the laser beam is 6 mm.
8. The laser CMT joint welding method suitable for the thin arm support of the overhead working truck as claimed in claim 1, wherein the laser parameters are 3kW to 5kW of laser power, minus 5mm to +5mm of defocusing amount, 0.8m/min to 1.2m/min of welding speed, 1m/min to 5m/min of wire feeding speed, 50A to 150A of welding current and-1% to 2% of arc length correction coefficient;
the protective gas flow is 20L/min-30L/min.
9. The laser CMT (constant current time) combined welding method suitable for the thin arm support of the overhead working truck as claimed in claim 1, wherein the laser parameters are 3kW to 4kW of laser power, minus 5mm to plus 5mm of defocusing amount, 0.8m/min to 1.0m/min of welding speed, 1m/min to 5m/min of wire feeding speed, 50A to 150A of welding current and 0% to 2% of arc length correction coefficient;
the protective gas flow is 20L/min-30L/min.
10. The laser CMT joint welding method for the thin arm support of the overhead working truck as claimed in claim 1, wherein the laser parameters are 4kW of laser power, +2mm of defocusing amount, 1.0m/min of welding speed, 3.5m/min of wire feeding speed, 100A of welding current and 2% of arc length correction coefficient;
the parameters of the protective gas are 80% Ar + 20% CO 2 The protective gas flow is 25L/min.
CN202210540144.0A 2022-05-18 2022-05-18 Laser CMT (constant current time) joint welding method suitable for thin arm support of overhead working truck Pending CN114918544A (en)

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* Cited by examiner, † Cited by third party
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CN101811231A (en) * 2009-02-20 2010-08-25 机械科学研究院哈尔滨焊接研究所 Method for welding with laser-cold metal transferred arc composite heat source
CN101954543A (en) * 2010-08-04 2011-01-26 机械科学研究院哈尔滨焊接研究所 Non-splash, low-deformation, high-quality and high-efficiency welding method for T-shaped joint of aluminum alloy sheet
JP2012223799A (en) * 2011-04-20 2012-11-15 Kobe Steel Ltd Method of manufacturing welded joint
CN107717230A (en) * 2017-11-24 2018-02-23 哈尔滨工业大学 A kind of lateral CMT complex welding methods of laser
CN109108466A (en) * 2018-10-24 2019-01-01 哈尔滨阿尔特机器人技术有限公司 Cut deal square groove laser and electric arc combine welding method
CN110293321A (en) * 2019-06-25 2019-10-01 中车青岛四方机车车辆股份有限公司 Laser c MT composite welding system, welding method and aluminum alloy bodywork welded unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101811231A (en) * 2009-02-20 2010-08-25 机械科学研究院哈尔滨焊接研究所 Method for welding with laser-cold metal transferred arc composite heat source
CN101954543A (en) * 2010-08-04 2011-01-26 机械科学研究院哈尔滨焊接研究所 Non-splash, low-deformation, high-quality and high-efficiency welding method for T-shaped joint of aluminum alloy sheet
JP2012223799A (en) * 2011-04-20 2012-11-15 Kobe Steel Ltd Method of manufacturing welded joint
CN107717230A (en) * 2017-11-24 2018-02-23 哈尔滨工业大学 A kind of lateral CMT complex welding methods of laser
CN109108466A (en) * 2018-10-24 2019-01-01 哈尔滨阿尔特机器人技术有限公司 Cut deal square groove laser and electric arc combine welding method
CN110293321A (en) * 2019-06-25 2019-10-01 中车青岛四方机车车辆股份有限公司 Laser c MT composite welding system, welding method and aluminum alloy bodywork welded unit

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