CN115446427B - Double-sided welding device and method suitable for middle-thin wall structure - Google Patents
Double-sided welding device and method suitable for middle-thin wall structure Download PDFInfo
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- CN115446427B CN115446427B CN202211279685.9A CN202211279685A CN115446427B CN 115446427 B CN115446427 B CN 115446427B CN 202211279685 A CN202211279685 A CN 202211279685A CN 115446427 B CN115446427 B CN 115446427B
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- 238000003466 welding Methods 0.000 title claims abstract description 255
- 238000000034 method Methods 0.000 title claims abstract description 37
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052786 argon Inorganic materials 0.000 claims abstract description 15
- 241001016380 Reseda luteola Species 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 238000005192 partition Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention provides a double-sided welding device and a double-sided welding method suitable for a middle-thin wall structure. The operation platforms are arranged on two sides of the workpiece and used for bearing equipment such as a welding power supply and the like and fixing the welding gun and the ultrasonic sensing positioning device; the pulley driving device is used for providing power for the pulley, and the pulley is arranged on the end face of the workpiece; the ultrasonic sensing positioning device is used for scanning a welding seam of a workpiece, and the control system and the coordinated motion system control the welding gun adjusting device to finely adjust the position of the front end of the welding gun after receiving and analyzing the scanning result, so that the front end of the welding gun is positioned at the center of the welding seam and is welded at a certain angle; the welding power supply has an argon arc welding function and is provided with a corresponding welding gun. The invention can be used for welding thin-wall structures in aluminum magnesium alloy and the like, can realize one-time welding forming within a certain thickness range, reduces welding thermal deformation and ensures welding quality.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a double-sided welding device and method suitable for a middle-thin wall structure.
Background
The industrial equipment has a plurality of thin-wall equipment, the thickness is generally about 6mm, and the conventional welding method such as manual arc welding, argon arc welding or gas shielded welding is adopted to process grooves, so that the welding is multi-layer, the welding efficiency is low, the welding position is variable, and the welding quality is unstable. For cylinder structures such as gas tanks, aluminum magnesium alloy bins and the like in petrochemical projects, the thickness of the wallboard is thinner, the welding seams mainly comprise butt transverse seams and butt longitudinal seams, the welding seams are large and regular in length, and the automatic welding is suitable for being carried out.
The existing welding equipment is mainly suitable for welding rod arc welding or submerged arc welding, has larger line energy in welding nonferrous metal materials such as aluminum and magnesium, is easy to cause quality problems such as burn-through or air holes, lacks efficient and reliable welding devices and welding technologies, and is more serious in surface secondary reflection phenomenon due to the fact that a laser tracking method is adopted in traditional weld positioning, so that analysis and extraction of weld groove information are not facilitated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the double-sided welding device and the double-sided welding method suitable for the middle-thin wall structure, which realize the accurate positioning of the welding seam position, ensure the welding effect, and simultaneously use an argon arc welding method, so that the welding line has low energy and is not easy to cause the quality problems of burning through or air holes and the like.
The present invention achieves the above technical object by the following means.
The double-sided welding device suitable for the middle thin-wall structure comprises an operation platform arranged on two sides of a workpiece, wherein a first pulley driving device, a welding power supply and a welding material are arranged on the upper part of a partition plate of the operation platform, and a welding gun, a welding gun adjusting device, an ultrasonic sensing positioning device, a control system, a coordinated motion system and a second pulley driving device are arranged on the lower part of the partition plate; the first pulley driving device, the second pulley driving device, the welding power supply, the welding gun adjusting device and the ultrasonic sensing positioning device are all in signal connection with the control system and the coordinated motion system; the first pulley driving device and the second pulley driving device) are respectively used for providing power for the first pulley and the second pulley, and the first pulley and the second pulley are contacted with the surface of the workpiece to drive the operation platform to integrally walk on the surface of the workpiece.
Further, the welding gun is an argon arc welding gun and is connected with a welding power supply.
Further, the ultrasonic sensing positioning device adopts a linear scanning mode, the installation position of the ultrasonic sensing positioning device and the welding gun are positioned at the same parallel position, and the ultrasonic sensing positioning device is arranged in front of the welding gun along the welding direction.
The double-sided welding method using the double-sided welding device comprises the following steps:
for workpiece materials with wall thickness within 5 mm:
firstly assembling workpieces in a groove-free mode, then placing double-sided welding devices on two sides of the assembled workpieces, adjusting the positions of welding guns on two sides to align the welding guns to the surface of a welding line, debugging an ultrasonic sensing positioning device and a welding gun adjusting device, and ensuring that the welding guns are positioned at the center line position of a welding line gap in the welding process;
the welding is carried out by adopting a bidirectional synchronous method, in the welding process, the ultrasonic sensing positioning device scans the surface of the workpiece in real time and feeds back the surface of the workpiece to the control system and the coordinated motion system, after the control system and the coordinated motion system acquire a group of shortest distances detected by the ultrasonic sensing positioning device, whether the detected two shortest distance values are consistent or not is judged, if the detected two shortest distance values are inconsistent, the welding gun adjusting device is controlled to finely adjust the angle of a welding gun, and the included angle between the welding gun and the surface of a welding seam is ensured to be kept at 90 degrees; meanwhile, the control system and the coordinated motion system compare and analyze the shortest distance of the group with an internal preset value, and control the welding gun adjusting device to finely adjust the height position of the welding gun according to analysis results;
for workpiece materials with wall thickness of 5-10 mm:
firstly, cutting blanking and processing a groove by adopting a mechanical method to form a double-sided single-sided V-shaped groove, then assembling and setting a welding gun angle;
and then welding the two sides simultaneously, feeding wires simultaneously, scanning the surface of the workpiece in real time by an ultrasonic sensing positioning device in the welding process, feeding back to a control system and a coordinated motion system, analyzing and processing by the control system and the coordinated motion system to obtain the position of the root of the welding seam, the position of the upper end face of a groove of the welding seam, the position data of the central line of the gap of the welding seam, and comparing the position data with the preset position of the welding gun, the allowable deviation of the angle and other data, and further controlling the welding gun adjusting device to finely adjust the position and the angle of the welding gun, so that the front end of the welding gun is positioned at the center of the welding seam and is welded at a certain angle.
Further, for the workpiece with the wall thickness of 5-10 mm, the distance from the ultrasonic sensing and positioning device to the root of the welding seam is L, 2L=V Super-energy storage device T, wherein V Super-energy storage device Representing the propagation speed of the ultrasonic wave in the air, t representing the time difference from the reflection of the ultrasonic wave to the reception;
in the period of t, the distance travelled by the welding gun is 2s,2 s=v Gun T, wherein V Gun Indicating the travel speed of the welding gun;
the position of the weld root, i.e. the straight line distance from the welding gun to the weld root right below the welding gun is H,
further, aiming at the workpiece with the wall thickness of 5-10 mm, if an included angle theta exists between the groove and the ultrasonic sensing perpendicular bisector, the vertical distance H between the upper end face of the groove and the ultrasonic sensing positioning device is formed Slope with a slope surface Perpendicular distance L from groove upper end face to ultrasonic sensing positioning device Slope with a slope surface The method comprises the following steps:
H slope with a slope surface ＝H·cosθ；L Slope with a slope surface ＝H·sinθ
The control system and the coordinated movement system are used for comparing the corresponding H on two sides Slope with a slope surface And L Slope with a slope surface And determining the position of the central line of the welding seam gap.
Further, the workpiece with the wall thickness within 5mm is provided with a pairing gap of 1-2 mm; when the bidirectional synchronous method is adopted for welding, the outer side of a workpiece is a main filling welding wire, the inner side of the workpiece is matched, the welding wire is not filled, only argon is sent for back protection, the included angle between the welding wire and the surface of a welding line is 15 degrees when the welding wire is fed, and the included angle between a welding gun and the surface of the welding line is kept at 90 degrees; the argon arc welding filler wire structure is fixed on a welding gun, is fed into a molten pool at a certain angle, and has a tungsten electrode diameter of 4mm, a nozzle diameter of 14mm, an argon flow of 12L/min and a welding current of 90-110A during welding.
Further, for the workpiece with the wall thickness of 5-10 mm, the pairing gap is 1.5-3 mm, the blunt edge is 1-2 mm, the thickness of the inner groove of the workpiece is smaller than that of the outer groove, and the angle of the inner groove of the workpiece is larger than that of the outer groove.
Further, in the process of simultaneously welding two sides of the workpiece, the included angle between the welding wire and the welding gun is 15-30 degrees when the welding wire is fed, the tungsten electrode diameter is 4mm when in welding, the nozzle diameter is 14mm, the argon flow is 12L/min, the backing welding current at two sides of the workpiece is 80-100A, the welding current is not swung, the filling cover welding current is 110-130A, and the swinging amplitude is 5-10 mm.
The invention has the following beneficial effects:
the double-sided welding device provided by the invention has the advantages of portability and strong operability, adopts the pulley structure to ensure that the operation platform is integrally supported and walked on the surface of a workpiece, solves the problem that materials such as stainless steel or aluminum alloy are not magnetic conductive, adopts the ultrasonic sensing positioning device to scan and detect a welding area, is favorable for realizing accurate positioning of the welding seam position, and adopts an argon arc welding method, the welding line has low energy, the welding joint performance is reliable, and the quality problems such as burning through or air holes are not easy to occur; the invention can realize high-efficiency and accurate welding of metals such as aluminum magnesium alloy and the like in a certain thickness by organically combining the double-sided welding device and the welding process, and reduces the harm of welding smoke dust and arc light to welders to a certain extent.
Drawings
FIG. 1 is a schematic side view of a double-sided welding apparatus;
FIG. 2 is a schematic diagram of the top surface structure of a double-sided welding device;
FIG. 3 is a schematic diagram of weld root position analysis of a workpiece material with a groove;
FIG. 4 is a schematic diagram of an analysis of the position of the upper end surface of a weld groove of a workpiece material with a groove;
FIG. 5 is a flow chart of control adjustments of the control system and coordinated motion system for a workpiece material with a bevel;
FIG. 6 is a schematic view of workpiece material alignment within 5mm of wall thickness;
FIG. 7 is a schematic diagram of the beveling of a workpiece material with a wall thickness of 5-8 mm.
In the figure: 1-an operation platform; 2-a first pulley drive; 3-a second pulley drive; 4-a welding power supply; 5-an ultrasonic sensing and positioning device; 6-a control system and a coordinated motion system; 7-welding gun; 8-a workpiece; 9-groove.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
As shown in fig. 1 and 2, the double-sided welding device suitable for the middle-thin wall structure comprises an operation platform 1 arranged on two sides of a workpiece, wherein the operation platform 1 is in a rectangular frame structure, mainly plays roles of bearing and wind prevention, and is internally provided with a partition board; the upper part of a partition plate of the operation platform 1 is provided with a first pulley driving device 2, a welding power supply 4, a welding material and other components, and the lower part of the partition plate is provided with a welding gun 7, a welding gun adjusting device, an ultrasonic sensing and positioning device 5, a control system, a coordinated motion system 6, a second pulley driving device 3 and other components.
As shown in fig. 1 and 2, the first pulley driving device 2, the second pulley driving device 3, the welding power supply 4, the welding gun adjusting device and the ultrasonic sensing and positioning device 5 are all in signal connection with the control system and the coordinated motion system 6; the first pulley driving device 2 and the second pulley driving device 3 are respectively used for providing power for the first pulley and the second pulley, and the first pulley and the second pulley are contacted with the surface of the workpiece 8, so that the operation platform 1 is driven to integrally walk on the surface of the workpiece 8 in practical application.
The welding gun 7 is an argon arc welding gun 7 and is connected with the welding power supply 4; the welding gun adjusting device has a three-dimensional direction adjusting function, can adjust the position and the angle of the welding gun 7, comprises an electric cross slide block, a swinging controller, a gun head clamping device and the like, and ensures that the distance and the angle between the welding gun 7 and the workpiece 8 meet the set requirements.
As shown in fig. 1 and 2, the ultrasonic sensing and positioning device 5 adopts a linear scanning mode, and the installation position of the ultrasonic sensing and positioning device is in the same parallel position with the welding gun 7 and is arranged in front of the welding direction, namely, in front of the welding gun 7; the ultrasonic sensing positioning device 5 scans the surface of the workpiece 8 to further determine the state of the surface of the welding seam, determines the characteristic information of the welding seam through ultrasonic reflection time difference and intensity, feeds back the detected characteristic information of the welding seam to the control system and the coordinated motion system 6, analyzes and processes the characteristic information of the welding seam through the control system and the coordinated motion system 6, and then controls the welding gun adjusting device to finely adjust the position and the angle of the welding gun 7, so that the front end of the welding gun 7 is positioned at the center of the welding seam and is welded at a certain angle.
The welding method by using the double-sided welding device is as follows (in this embodiment, a magnesium-aluminum alloy cylinder structure is preferably used as a welding object):
for workpiece 8 materials with wall thickness within 5 mm:
as shown in fig. 6, the assembly is performed in a mode of not processing grooves 9, the end faces of the assembly pairs are leveled before the assembly pairs, and the assembly gap a is controlled to be 1-2 mm at the moment;
installing each component module of the double-sided welding device, and placing the double-sided welding device on two sides of the workpiece 8 completed by the team through a crane;
adjusting the positions of the welding guns 7 at two sides to the corresponding welding seam surfaces, then carrying out pre-production test on the whole double-sided welding device, debugging the ultrasonic sensing positioning device 5 and the welding gun adjusting device, and ensuring that the welding guns 7 are positioned at the center line position of a welding seam gap in the welding process;
the welding is carried out by adopting a bidirectional synchronous method, the outer side of the cylinder body is provided with a main filling welding wire, the inner side of the cylinder body is matched, the main filling welding wire is not filled, only argon is sent for back protection, the welding heat is concentrated, and phenomena such as air holes, slag inclusion, unfused and the like are not easy to generate; the included angle between the welding wire and the surface of the welding line is preferably 15 degrees or so when the welding wire is fed, and the included angle between the welding gun 7 and the surface of the welding line is preferably kept at 90 degrees; the argon arc welding filler wire structure is fixed on a welding gun 7, and is fed into a molten pool at a certain angle, the diameter of a tungsten electrode is 4mm during welding, the diameter of a nozzle is 14mm, the flow rate of argon is 12L/min, welding process parameters are different according to the thickness of materials, and when the thickness of the wall of a workpiece 8 material is 4-6 mm, the welding current is 90-110A;
in the welding process, the ultrasonic sensing and positioning device 5 scans the surface of the workpiece 8 in real time and feeds back the surface to the control system and coordinated motion system 6, and the control system and coordinated motion system 6 acquires a group of shortest distances detected by the ultrasonic sensing and positioning device 5 (namely the distances from the ultrasonic sensing and positioning device 5 to the two workpiece 8 groups of paired ports); the control system and the coordinated motion system 6 judge whether the two detected shortest distance values are consistent, if not, the welding gun adjusting device is controlled to finely adjust the angle of the welding gun 7, and the included angle between the welding gun 7 and the surface of the welding seam is ensured to be kept at 90 degrees; meanwhile, the control system and coordinated motion system 6 compares the shortest distance with an internal preset value, judges whether the height position of the welding gun 7 meets the requirement, and controls the welding gun adjusting device to finely adjust the position of the welding gun 7 if the height position of the welding gun does not meet the requirement.
For a workpiece 8 material with a wall thickness of 5-10 mm:
first of all by mechanical meansCutting, blanking and processing a groove 9 to form a double-sided single-sided V-shaped groove 9 shown in figures 3 and 7, ensuring that the pairing gap a is 1.5-3 mm, the blunt edge b is 1-2 mm, and ensuring that the surface of a workpiece 8 is smooth and free of burrs and burrs; the thickness of the inner groove 9 of the cylinder body is slightly smaller than that of the outer groove 9, and the angle alpha of the inner groove 9 of the cylinder body 2 Slightly greater than the angle alpha of the outer groove 9 1 The filler materials of the welding seams at the two sides can be kept basically consistent, and the numerical values of the processing parameters of the specific groove 9 are shown in the following table 1;
table 1 groove 9 machining parameter table
Setting the angles of the welding guns 7, ensuring that the angles of the welding guns 7 at two sides are half of the angles of the grooves 9 at one side, simultaneously welding the two sides, simultaneously feeding wires, preferably forming an included angle between the welding wires and the welding guns 7 at 15-30 degrees, wherein the diameter of a tungsten electrode is 4mm, the diameter of a nozzle is 14mm, and the flow rate of argon is 12L/min; the backing welding current at the two sides is 80-100A, and the backing welding current does not swing; the welding current of the filling cover surface is 110-130A, and the swing amplitude is 5-10 mm;
in the welding process, as shown in fig. 5, the ultrasonic sensing and positioning device 5 scans the surface of the workpiece 8 in real time and feeds back the surface to the control system and the coordination movement system 6, the control system and the coordination movement system 6 analyze and process the surface to obtain data such as the position of the root of the welding seam, the position of the upper end face of the welding groove 9, the position of the central line of the welding seam and the like, and compare the data with the data such as the position of the welding gun 7 preset in the interior and the allowable deviation of the angle, so as to control the welding gun adjusting device to finely adjust the position and the angle of the welding gun 7, and the front end of the welding gun 7 is positioned in the center of the welding seam and welded at a certain angle, thereby effectively ensuring the welding effect and quality;
for weld root position:
as shown in fig. 3, the distance from the ultrasonic sensing and positioning device 5 to the root of the weld is L,2L＝V super-energy storage device ·t，V Super-energy storage device Representing the propagation speed of ultrasonic waves in the air, wherein the propagation speed is 340m/s, and t represents the time difference from the reflection to the reception of ultrasonic waves;
during the period t, the distance travelled by the welding gun 7 is 2s,2 s=v Gun ·t，V Gun Indicating the travel speed of the welding gun 7;
the weld root position, i.e. the straight line distance from the welding gun 7 to the weld root directly below it is H,
aiming at the position of the upper end face of the welding groove 9:
as shown in fig. 4, since the groove 9 has a certain angle θ with the ultrasonic sensing perpendicular bisector, the vertical distance H from the upper end surface of the groove 9 to the ultrasonic sensing positioning device 5 Slope with a slope surface Perpendicular distance L from upper end face of groove 9 to ultrasonic sensing and positioning device 5 Slope with a slope surface The following is shown:
H slope with a slope surface ＝H·cosθ；L Slope with a slope surface ＝H·sinθ。
For weld gap centerline position:
control system and coordinated motion system 6 compare corresponding H on both sides Slope with a slope surface And L Slope with a slope surface The position of the center line of the weld gap can be determined.
The welding method disclosed by the invention has the advantages that the welding heat is concentrated, the defects of air holes, slag inclusion, unfused and the like are avoided, meanwhile, the angle position of the welding gun 7 can be adjusted according to different working conditions through the welding seam positioning tracking and welding gun adjusting device, the adaptability and the stability of the welding process are improved, and single-sided welding can be selected according to working requirements.
The related structure and principle of pulley driving, the structure and the adjusting principle of the welding gun adjusting device are all adopted by the prior art means, and the embodiment is not repeated. The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (3)
1. The double-sided welding method by utilizing the double-sided welding device suitable for the middle-thin wall structure is characterized in that the double-sided welding device suitable for the middle-thin wall structure comprises an operation platform (1) arranged at two sides of a workpiece, a first pulley driving device (2), a welding power supply (4) and a welding material are arranged at the upper part of a partition plate of the operation platform (1), a welding gun (7), a welding gun adjusting device, an ultrasonic sensing positioning device (5), a control system, a coordinated motion system (6) and a second pulley driving device (3) are arranged at the lower part of the partition plate; the first pulley driving device (2), the second pulley driving device (3), the welding power supply (4), the welding gun adjusting device and the ultrasonic sensing positioning device (5) are connected with the control system and the coordinated motion system (6) through signals; the first pulley driving device (2) and the second pulley driving device (3) are respectively used for providing power for the first pulley and the second pulley, and the first pulley and the second pulley are both contacted with the surface of the workpiece (8);
the double-sided welding method comprises the following steps:
for workpiece (8) materials with wall thickness within 5 mm:
firstly, assembling a workpiece (8) in a mode of not processing a groove (9), then placing double-sided welding devices on two sides of the assembled workpiece (8), and adjusting the position of a welding gun (7) to align the welding gun to the surface of a welding seam; the welding is carried out by adopting a bidirectional synchronous method, in the welding process, an ultrasonic sensing positioning device (5) scans the surface of a workpiece (8) and feeds back the surface to a control system and a coordinated motion system (6), after the control system and the coordinated motion system (6) acquire a group of shortest distances detected by the ultrasonic sensing positioning device (5), whether the two detected shortest distance values are consistent or not is judged, if the two detected shortest distance values are inconsistent, a welding gun adjusting device is controlled to finely adjust the angle of a welding gun (7), and the included angle between the welding gun (7) and the surface of a welding seam is ensured to be 90 degrees; meanwhile, the control system and the coordinated motion system (6) compare and analyze the shortest distance of the group with an internal preset value, and control the welding gun adjusting device to finely adjust the height position of the welding gun (7) according to analysis results;
for a workpiece (8) material with a wall thickness of 5-10 mm:
firstly, machining a groove (9) of a workpiece (8), then assembling, and setting the angle of a welding gun (7); then welding and wire feeding are carried out on the two sides simultaneously, in the welding process, an ultrasonic sensing positioning device (5) scans the surface of a workpiece (8) and feeds back the surface to a control system and a coordination movement system (6), the control system and the coordination movement system (6) obtain weld root position, weld groove (9) upper end surface position and weld gap central line position data after analysis and processing, and the weld root position, the weld groove upper end surface position and the weld gap central line position data are compared with internal preset welding gun (7) position and angle allowable deviation data, so that a welding gun adjusting device is controlled to finely adjust the position and the angle of the welding gun (7) to enable the front end of the welding gun (7) to be positioned in the center of a weld and welded at a certain angle;
for the workpiece (8) with the wall thickness of 5-10 mm, the distance from the ultrasonic sensing and positioning device (5) to the root of the welding seam is L, and 2L=V Super-energy storage device T, wherein V Super-energy storage device Representing the propagation speed of the ultrasonic wave in the air, t representing the time difference from the reflection of the ultrasonic wave to the reception;
in the period of t, the distance travelled by the welding gun (7) is 2S,2 S=V Gun T, wherein V Gun Indicating the travel speed of the welding gun (7); the straight line distance from the welding gun (7) to the welding seam root part right below the welding seam root part is H,
aiming at the workpiece (8) with the wall thickness of 5-10 mm, an included angle theta exists between the groove (9) and the ultrasonic sensing perpendicular bisector, so that the vertical distance H from the upper end surface of the groove (9) to the ultrasonic sensing positioning device (5) is formed Slope with a slope surface Perpendicular distance L from upper end face of groove (9) to ultrasonic sensing and positioning device (5) Slope with a slope surface The method comprises the following steps:
H slope with a slope surface ＝H·cosθ；L Slope with a slope surface ＝H·sinθ
The control system and the coordinated motion system (6) are used for comparing the corresponding H on two sides Slope with a slope surface And L Slope with a slope surface And determining the position of the central line of the welding seam gap.
2. The double-sided welding method according to claim 1, characterized in that for the workpiece (8) with a wall thickness of 5mm or less, the outside of the workpiece (8) is mainly filled with welding wire, the inside is matched, the welding wire is not filled, and only argon gas is fed for back protection.
3. The double-sided welding method according to claim 1, characterized in that for the workpiece (8) having a wall thickness of 5-10 mm, the thickness of the inner bevel (9) of the workpiece (8) is smaller than the thickness of the outer bevel (9), and the angle of the inner bevel (9) of the workpiece (8) is larger than the angle of the outer bevel (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211279685.9A CN115446427B (en) | 2022-10-19 | 2022-10-19 | Double-sided welding device and method suitable for middle-thin wall structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211279685.9A CN115446427B (en) | 2022-10-19 | 2022-10-19 | Double-sided welding device and method suitable for middle-thin wall structure |
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| Publication Number | Publication Date |
|---|---|
| CN115446427A CN115446427A (en) | 2022-12-09 |
| CN115446427B true CN115446427B (en) | 2023-12-12 |
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| CN114951906A (en) * | 2021-02-25 | 2022-08-30 | 奥迪股份公司 | Welding system and method for operating a welding system |
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