CN115351452B - Galvanized strip steel welding device and butt welding method - Google Patents
Galvanized strip steel welding device and butt welding method Download PDFInfo
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- CN115351452B CN115351452B CN202210998717.4A CN202210998717A CN115351452B CN 115351452 B CN115351452 B CN 115351452B CN 202210998717 A CN202210998717 A CN 202210998717A CN 115351452 B CN115351452 B CN 115351452B
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- 238000003466 welding Methods 0.000 title claims abstract description 345
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 93
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 61
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 58
- 239000011701 zinc Substances 0.000 claims abstract description 58
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- 230000005540 biological transmission Effects 0.000 claims description 41
- 238000003801 milling Methods 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 35
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 8
- 239000008397 galvanized steel Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000010485 coping Effects 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 206010039509 Scab Diseases 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009966 trimming 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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
Abstract
The invention discloses a galvanized sheet steel strip welding device and a butt welding method, and relates to the technical field of welding. The galvanized sheet steel strip welding device comprises a C-shaped frame, wherein double-cutting shears, a rolling wheel and a welding wheel are arranged on the C-shaped frame, and steel strips are arranged below the double-cutting shears. According to the galvanized sheet steel strip welding device and the butt welding method, the narrow overlap welding machine device and the welding method are adopted, so that the influence of a zinc layer on the welding of a steel strip substrate is solved, the effective welding of the head and tail of the galvanized sheet steel strip can be realized, the use of welding transition materials is reduced, the quality of a welding seam is stable and reliable, and the continuous operation of a galvanized sheet machine set is realized.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a galvanized strip steel welding device and a butt welding method.
Background
The welding of galvanized strip steel is an important operation technology of a cold-rolled sheet hot galvanizing production line, and defects such as zinc slag, holes, scratches and the like on the surface of the hot galvanizing strip steel are removed, and defects such as coiling, non-oiling, non-trimming and the like are overcome, and the hot galvanizing coils with defects are removed by a recoiling machine set again. Meanwhile, the narrow lap welding technology is widely applied to welding of hot dip galvanized strip steel of a continuous production line rewinding unit.
When the narrow lap welding is adopted to weld the hot dip galvanized sheet, because the surface of the strip steel is entirely covered by a zinc layer, the melting point of zinc is about 420 ℃, the boiling point is about 907 ℃ and is much lower than the melting point of steel (about 1535 ℃), when the narrow lap welding is adopted, the welding wheel walks on the surface of the hot dip galvanized strip steel to generate a large amount of heat energy, the zinc layer is preferentially evaporated, the evaporation of the zinc layer takes away a large amount of heat energy, so that the rest heat energy cannot be welded through the strip steel, an effective nugget size cannot be formed, when the welding current is increased, the heat energy is too high, high-pressure zinc steam volatilizes, serious air holes and hollow defects are easily generated on the surface of the thin zinc-plated strip steel welding line (the thickness is less than or equal to 0.8 mm), and stable welding line quality cannot be formed; meanwhile, zinc steam volatilizes to cause zinc powder to be adhered to the surface of the welding wheel in a large quantity, so that serious scab occurs on the surface of the welding wheel, the heat conduction, electric conduction and heat dissipation performances of the welding wheel are greatly reduced, the welding performance of galvanized strip steel is deteriorated, the effective welding of the quality of the welding seam of the galvanized strip steel cannot be realized, the welding performance of welding machine equipment is further influenced, the re-welding cannot be realized, and the welding wheel is required to be replaced for re-welding the welding seam.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a galvanized strip steel welding device and a butt welding method, which solve the problems that when a narrow lap welding is adopted to weld a hot galvanized plate, the surface of the strip steel is fully covered by a zinc layer, and the melting point of zinc is about 420 ℃, the boiling point is about 907 ℃ and is far lower than the melting point of steel (about 1535 ℃), so that when the narrow lap welding is adopted, a welding wheel walks on the surface of the hot galvanized strip steel to generate a large amount of heat energy, the zinc layer is preferentially evaporated, the evaporation of the zinc layer takes away a large amount of heat energy, so that the rest heat cannot be used for welding the strip steel, the effective nugget size cannot be formed, when the welding current is increased, the heat energy is too high, high-pressure zinc steam volatilizes, and serious air holes and hollow defects are easily generated on the surface of the thin galvanized strip steel weld joint (the thickness is less than or equal to 0.8 mm), and stable weld joint quality cannot be formed; meanwhile, zinc steam volatilizes to cause zinc powder to be adhered to the surface of the welding wheel in a large quantity, so that serious scab occurs on the surface of the welding wheel, the heat conduction, electric conduction and heat dissipation performances of the welding wheel are greatly reduced, the welding performance of galvanized strip steel is deteriorated, the effective welding of the quality of the welding seam of the galvanized strip steel cannot be realized, the welding performance of welding machine equipment is further influenced, the re-welding cannot be realized, and the problem that the welding wheel needs to be replaced and then the welding seam is re-welded is solved.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the galvanized strip steel welding device comprises a C-shaped frame, wherein double-cutting shears, a rolling wheel and a welding wheel are arranged on the C-shaped frame, and a steel belt is arranged below the double-cutting shears.
The butt welding method of the galvanized strip steel welding device comprises the following specific operations:
after the head and tail of the two galvanized steel belts are finely sheared, the two galvanized steel belts reach a narrow lap welding waiting position, the pinch rolls at the outlet and inlet are sleeved, and the side guides at the outlet and inlet adjust the positions of the steel belts so as to align the steel belts with the center line of the production line; closing a clamp to clamp strip steel, cutting the strip belt tail by double cutting of a welding machine, setting welding operation parameters, setting the lap joint amount, rotating and pressing up and down welding wheels of the welding machine, simultaneously, enabling a milling cutter to be tightly attached to the surface of the welding wheel and rapidly rotated and pressed down, and enabling a C-shaped frame to move to a transmission side from an operation side, generating heat (acting on a lap joint area) on the resistance of the strip steel and the centralized resistance of a contact part between the strip steel and the welding wheel, so that a zinc layer in the lap joint area is heated and volatilized, an original iron-based substrate is exposed, meanwhile, the iron-based substrate does not form a welding phenomenon due to insufficient heating, the volatilized zinc layer is attached to the surface of the welding wheel, and the zinc layer on the surface of the welding wheel can be rapidly removed through the milling cutter rotating at a high speed, thereby reducing the influence of the zinc layer on the surface quality and the conductivity of the welding wheel;
after the first round of welding wheel welding is completed, the evaporated zinc layer is heated and melted, the exposed iron-based substrate has good weldability, and is not influenced by the zinc layer in the process of re-welding. When the C-shaped frame starts to return to the original position of the operation side from the transmission side, the clamping platform of the welding machine is ensured to be not operated, the welding is performed again, the welding operation is set, the upper and lower welding wheels of the welding machine are rotationally pressed down, the welding wheel milling cutter is closely attached to the welding wheels and is rotationally pressed down at the same time, the exposed iron-based strip steel is heated, melted, cooled and crystallized, and finally the strip steel is welded.
According to the method, the zinc layer is melted and evaporated through self-generated resistance heating in the first round of welding, the iron-based substrate is exposed, and the good welding seam is obtained through welding the iron-based substrate in the second round, so that the influence of the zinc layer on the surface of the strip steel on the welding process can be effectively avoided.
The narrow lap welding equipment specifically comprises: the two on-line welding wheel coping milling cutters are fixed on the C-shaped frame member, and the upper milling cutter and the lower milling cutter are pressed down simultaneously to be clung to the surface of the welding wheel to rotate rapidly along with the rotation pressing of the upper welding wheel and the lower welding wheel of the welding machine. The rotation speed of the welding wheel is 4-15 m/min, the rotation speed of the milling cutter is 30m/min, and the upper milling cutter and the lower milling cutter are provided with chip guide pipes and chip storage grooves.
The narrow overlap welding equipment is characterized in that after the welding machine double-shear shears the belt head and tail, welding operation parameters are set, the C-shaped frame is moved from the operation side to the transmission side for first welding by given overlap amount, and the moving speed of the C-shaped frame is 4-15 m/min. When the C-shaped frame moves from the transmission side to the operation side for the second welding, the head and the tail of the belt are not sheared, the second welding is directly carried out, and after the welding is finished, the C-shaped frame returns to the original position.
The two welding operation parameters are directly given after the head and the tail of the double-cut-off tape are cut, and the welding operation parameters are not required to be set during the second welding.
Experimental study is carried out on welding operation parameters, and the narrow lap welding method is adopted, wherein the two welding operation parameters are as follows: the welding current is 6-30 KA, the welding speed is 4-15 m/min, the welding pressure is 400-3500 daN, the roller pressure is 500-5000 daN, the overlap joint amount of the operation side is 0.5-3.0 mm, and the overlap joint amount of the transmission side is 0.5-3.0 mm. The lap joint amount of the operation side of the two welding operations is set to be consistent, the lap joint amount of the transmission side is also required to be consistent, and meanwhile, the lap joint amount of the transmission side is required to be 0.3-0.9 mm greater than the lap joint amount of the operation side.
The steel grade number of the galvanized strip steel substrate comprises: CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, IF-HSS, P-HSS and dual phase steels DP600, DP800.
The thickness of the zinc layer of the strip steel substrate is 30g/m < 2 > -140 g/m < 2 >.
(III) beneficial effects
The invention provides a galvanized strip steel welding device and a butt welding method. The beneficial effects are as follows:
according to the galvanized steel strip welding device and the butt welding method, the narrow lap welder device and the welding method are adopted, so that the influence of a zinc layer on the welding of a steel strip substrate is solved, the effective welding of the head and tail of the galvanized steel strip can be realized, the use of welding transition materials is reduced, the quality of a welding seam is stable and reliable, and the continuous operation of a galvanized sheet set is realized.
Drawings
FIG. 1 is a schematic diagram of a welder welding apparatus;
FIG. 2 is a general flow chart of a narrow lap welding apparatus and method for galvanized strip steel;
the labels in the figures are: 1. a welding wheel; 2. a rolling wheel; 3. double cutting scissors; 4. a C-shaped frame; 5. a steel strip.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the present invention provides a technical solution: a galvanized strip steel welding device comprises a C-shaped frame 4, wherein a double-cutting shear 3, a rolling wheel 2 and a welding wheel 1 are arranged on the C-shaped frame 4, and a steel belt 5 is arranged below the double-cutting shear 3.
The butt welding method of the galvanized strip steel welding device comprises the galvanized strip steel welding device, and the specific operation is as follows:
after the head and tail of the two galvanized steel belts are finely sheared, the two galvanized steel belts reach a narrow lap welding waiting position, the pinch rolls at the outlet and inlet are sleeved, and the side guides at the outlet and inlet adjust the positions of the steel belts so as to align the steel belts with the center line of the production line; closing a clamp to clamp strip steel, cutting the strip belt tail by double cutting of a welding machine, setting welding operation parameters, setting the lap joint amount, rotating and pressing up and down welding wheels of the welding machine, simultaneously, enabling a milling cutter to be tightly attached to the surface of the welding wheel and rapidly rotated and pressed down, and enabling a C-shaped frame to move to a transmission side from an operation side, generating heat (acting on a lap joint area) on the resistance of the strip steel and the centralized resistance of a contact part between the strip steel and the welding wheel, so that a zinc layer in the lap joint area is heated and volatilized, an original iron-based substrate is exposed, meanwhile, the iron-based substrate does not form a welding phenomenon due to insufficient heating, the volatilized zinc layer is attached to the surface of the welding wheel, and the zinc layer on the surface of the welding wheel can be rapidly removed through the milling cutter rotating at a high speed, thereby reducing the influence of the zinc layer on the surface quality and the conductivity of the welding wheel;
after the first round of welding wheel welding is completed, the evaporated zinc layer is heated and melted, the exposed iron-based substrate has good weldability, and is not influenced by the zinc layer in the process of re-welding. When the C-shaped frame starts to return to the original position of the operation side from the transmission side, the clamping platform of the welding machine is ensured to be not operated, the welding is performed again, the welding operation is set, the upper and lower welding wheels of the welding machine are rotationally pressed down, the welding wheel milling cutter is closely attached to the welding wheels and is rotationally pressed down at the same time, the exposed iron-based strip steel is heated, melted, cooled and crystallized, and finally the strip steel is welded.
According to the method, the zinc layer is melted and evaporated through self-generated resistance heating in the first round of welding, the iron-based substrate is exposed, and the good welding seam is obtained through welding the iron-based substrate in the second round, so that the influence of the zinc layer on the surface of the strip steel on the welding process can be effectively avoided.
Narrow overlap welding equipment specifically includes: the two on-line welding wheel coping milling cutters are fixed on the C-shaped frame member, and the upper milling cutter and the lower milling cutter are pressed down simultaneously to be clung to the surface of the welding wheel to rotate rapidly along with the rotation pressing of the upper welding wheel and the lower welding wheel of the welding machine. The rotation speed of the welding wheel is 4-15 m/min, the rotation speed of the milling cutter is 30m/min, and the upper milling cutter and the lower milling cutter are provided with chip guide pipes and chip storage grooves.
And after the narrow lap welding equipment cuts the belt head and the tail in double cutting mode, setting welding operation parameters, setting lap joint amount, and moving the C-shaped frame from the operation side to the transmission side for first welding, wherein the moving speed of the C-shaped frame is 4-15 m/min. When the C-shaped frame moves from the transmission side to the operation side for the second welding, the head and the tail of the belt are not sheared, the second welding is directly carried out, and after the welding is finished, the C-shaped frame returns to the original position.
The two welding operation parameters are directly given after the head and the tail of the double-cut-off tape are cut, and the welding operation parameters are not required to be set during the second welding.
Experimental study is carried out on welding operation parameters, and the narrow lap welding method is adopted, wherein the two welding operation parameters are as follows: the welding current is 6-30 KA, the welding speed is 4-15 m/min, the welding pressure is 400-3500 daN, the roller pressure is 500-5000 daN, the overlap joint amount of the operation side is 0.5-3.0 mm, and the overlap joint amount of the transmission side is 0.5-3.0 mm. The lap joint amount of the operation side of the two welding operations is set to be consistent, the lap joint amount of the transmission side is also required to be consistent, and meanwhile, the lap joint amount of the transmission side is required to be 0.3-0.9 mm greater than the lap joint amount of the operation side.
The steel grade number of the galvanized strip steel substrate comprises: CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, IF-HSS, P-HSS and dual phase steels DP600, DP800.
The thickness of the zinc layer of the strip steel substrate is 30g/m < 2 > -140 g/m < 2 >.
Examples:
embodiment one:
the steel grade of the base plate is DX51D-Z, the thickness is 0.4mm, the thickness of a zinc layer is 120 g/square meter, the lap joint amount of an operation side is set to be 1.2mm in the first round of welding process of the strip steel, the lap joint amount of a transmission side is set to be 1.4mm, the pressure of a welding wheel is 900daN, the pressure of a rolling wheel is 750daN, the welding current is 8KA, the welding speed is 12m/min, the first round of welding aims to melt and evaporate the zinc layer on the surface of the base plate, the iron base is reserved, and meanwhile, a C-shaped frame is moved to the transmission side; and in the second round of welding process, the welding machine clamping platform is kept unchanged, the lap joint amount of the operation side is set to be 1.2mm, the lap joint amount of the transmission side is set to be 1.4mm, the pressure of the welding wheel is 500daN, the pressure of the rolling wheel is 450daN, the welding current is 7KA, the welding speed is 12m/min, the C-shaped frame starts to move to the operation side from the transmission side, and the exposed substrate metal is welded by the second round. In the two welding processes, the milling cutter follows the welding wheel to walk along with the speed of the C-shaped frame, clings to the welding wheel, grinds the surface of the welding wheel,
and a crescent shear is adopted for the obtained welding seam, crescent moon on two sides is sheared, a cup process test is carried out on the crescent moon on two sides by a cup process tester, the toughness of the welding seam joint is good, and the cup process test is qualified.
The welding machine is used for canceling the protection self-locking after the first round of welding is finished in a program mode, so that the clamping table can be prevented from being opened in control, and the C-shaped frame and the welding wheel can be used for realizing the second welding.
Embodiment two:
the steel grade of the base plate is DX53D-Z, the thickness is 0.8mm, the thickness of a zinc layer is 60 g/square meter, the lap joint amount of an operation side is set to be 1.6mm in the first round of welding process of the strip steel, the lap joint amount of a transmission side is set to be 1.8mm, the pressure of a welding wheel is 1200daN, the pressure of a rolling wheel is 1000daN, the welding current is 10KA, the welding speed is 10m/min, the first round of welding aims to melt and evaporate the zinc layer on the surface of the base plate, the iron base is reserved, and meanwhile, a C-shaped frame is moved to the transmission side; and in the second round of welding process, the welding machine clamping platform is kept unchanged to keep the lap joint amount unchanged, the lap joint amount of the operation side is set to be 1.6mm, the lap joint amount of the transmission side is set to be 1.8mm, the pressure of the welding wheel is 700daN, the pressure of the rolling wheel is 650daN, the welding current is 12KA, the welding speed is 10m/s, the C-shaped frame starts to move to the operation side from the transmission side, and the exposed substrate metal is welded by the second round. In the two welding processes, the milling cutter follows the welding wheel to walk along with the speed of the C-shaped frame, clings to the welding wheel, grinds the surface of the welding wheel,
and a crescent shear is adopted for the obtained welding seam, crescent moon on two sides is sheared, a cup process test is carried out on the crescent moon on two sides by a cup process tester, the toughness of the welding seam joint is good, and the cup process test is qualified.
The welding machine is used for canceling the protection self-locking after the first round of welding is finished in a program mode, so that the clamping table can be prevented from being opened in control, and the C-shaped frame and the welding wheel can be used for realizing the second welding.
Embodiment III:
the steel grade of the base plate is H420LAD-Z, the thickness is 1.2mm, the zinc layer thickness is 40 g/square meter, the lap joint amount of the operation side is set to be 2.0mm in the first round of welding process, the lap joint amount of the transmission side is 2.2mm, the pressure of the welding wheel is 1500daN, the pressure of the rolling wheel is 1300daN, the welding current is 15KA, the welding speed is 9m/min, the first round of welding aims to melt and evaporate the zinc layer on the surface of the base plate, the iron base is reserved, and meanwhile, the C-shaped frame is moved to the transmission side; and in the second round of welding process, the welding machine clamping platform is kept not to act, the lap joint amount is kept unchanged, the lap joint amount of the operation side is set to be 2.0mm, the lap joint amount of the transmission side is set to be 2.2mm, the pressure of the welding wheel is 1000daN, the pressure of the rolling wheel is 850daN, the welding current is 18KA, the welding speed is 9m/min, the C-shaped frame starts to move to the operation side from the transmission side, and the exposed substrate metal is welded by the second round. In the two welding processes, the milling cutter follows the welding wheel to walk along with the speed of the C-shaped frame, clings to the welding wheel, grinds the surface of the welding wheel,
and a crescent shear is adopted for the obtained welding seam, crescent moon on two sides is sheared, a cup process test is carried out on the crescent moon on two sides by a cup process tester, the toughness of the welding seam joint is good, and the cup process test is qualified.
The welding machine is used for canceling the protection self-locking after the first round of welding is finished in a program mode, so that the clamping table can be prevented from being opened in control, and the C-shaped frame and the welding wheel can be used for realizing the second welding.
Embodiment four:
the steel grade of the base plate is DP600-Z, the thickness is 1.8mm, the zinc layer thickness is 80 g/square meter, the lap joint amount of the operation side is set to 2.5mm in the first round of welding process of the strip steel, the lap joint amount of the transmission side is 2.8mm, the pressure of the welding wheel is 2500daN, the pressure of the rolling wheel is 2200daN, the welding current is 18KA, the welding speed is 6m/min, the first round of welding aims to melt the zinc layer on the surface of the base plate and evaporate the zinc layer, the iron base is reserved, and meanwhile, the C-shaped frame moves to the transmission side; and in the second round of welding process, the welding machine clamping platform is kept not to act, the lap joint amount is kept unchanged, the lap joint amount of the operation side is set to be 2.0mm, the lap joint amount of the transmission side is set to be 2.2mm, the pressure of the welding wheel is 1800daN, the pressure of the rolling wheel is 1600daN, the welding current is 22KA, the welding speed is 6m/min, the C-shaped frame starts to move to the operation side from the transmission side, and the exposed substrate metal is welded by the second round. In the two welding processes, the milling cutter follows the welding wheel to walk along with the speed of the C-shaped frame, clings to the welding wheel, grinds the surface of the welding wheel,
and a crescent shear is adopted for the obtained welding seam, crescent moon on two sides is sheared, a cup process test is carried out on the crescent moon on two sides by a cup process tester, the toughness of the welding seam joint is good, and the cup process test is qualified.
The welding machine is used for canceling the protection self-locking after the first round of welding is finished in a program mode, so that the clamping table can be prevented from being opened in control, and the C-shaped frame and the welding wheel can be used for realizing the second welding.
In summary, the galvanized strip steel welding device and the butt welding method solve the problem of the influence of the zinc layer on the welding of the strip steel base plate by adopting the narrow lap welding device and the welding method, can realize the effective welding of the strip steel head and tail of the galvanized strip steel, reduce the use of welding transition materials, ensure stable and reliable weld quality and realize the continuous operation of a galvanized sheet set.
Compared with the original equipment, the device has the following beneficial effects:
1. the original on-line grinding milling cutter of the narrow lap welder is fixed on a base of a C-shaped frame, the C-shaped frame does not work in the whole moving process, and after welding is finished, the C-shaped frame starts to grind the upper welding wheel and the lower welding wheel after reaching an original position. The improved on-line milling cutter is fixed on the C-shaped frame base, and moves along with the C-shaped frame, the milling cutter is tightly attached to the surface of the welding wheel and is rapidly rotated and pressed down when the welding wheel is rotated and pressed down, the zinc layer on the surface of the welding wheel is rapidly removed through the milling cutter which is rotated at a high speed, the influence of the zinc layer on the surface of the welding wheel is greatly reduced, and the weldability of the narrow lap welding machine on galvanized strip steel is improved. The milling cutter design of the original welding machine can not process zinc layers, welding slag and the like on the surface of the movable rotary welding wheel, and the galvanized strip steel can not be effectively welded; the improved online coping milling cutter design can realize the control of the surface quality of the welding wheel in the whole welding process, and solves the pollution and damage of zinc vapor volatilization to the surface of the welding wheel.
2. The original narrow lap welder can only weld the band steel lap zone once, the C-shaped frame starts to weld and moves to the transmission side from the operation side, the welding is completed, and the C-shaped frame does not weld from the transmission side to the operation side and only returns to the original position. The improved welding method is used for finishing two times of welding, namely, the C-shaped frame moves from the operation side to the transmission side and then returns to the original position operation side from the transmission side to weld the strip steel lap joint area.
3. The original narrow lap welder only can set one set of welding operation parameters for each welding, can not be adjusted according to the quality effect of the welding line of the lap zone, and can only select re-welding again; the modified welding method is used for finishing two times of welding by moving the C-shaped frame back and forth according to the specificity of the galvanized strip steel, and the whole welding time is not increased basically. Two sets of different welding operation parameters can be set according to different required targets (effects): the first set of welding operation parameters are used for eliminating the zinc layer in the lap joint area of the galvanized sheet, so that the zinc layer in the whole lap joint area volatilizes; the second set of welding operating parameters is to achieve welding of the substrate steel strip.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A butt welding method of a galvanized strip steel welding device is characterized in that: the galvanized strip steel welding device comprises a C-shaped frame (4), wherein double-cutting shears (3), rolling wheels (2) and welding wheels (1) are arranged on the C-shaped frame (4), and a steel belt (5) is arranged below the double-cutting shears (3);
the specific operation is as follows:
after the head and tail of the two galvanized steel belts are finely sheared, the two galvanized steel belts reach a narrow lap welding waiting position, the pinch rolls at the outlet and inlet are sleeved, and the side guides at the outlet and inlet adjust the positions of the steel belts so as to align the steel belts with the center line of the production line; closing a clamp to clamp strip steel, cutting the strip belt tail by double cutting of a welding machine, setting welding operation parameters, setting the lap joint amount, rotating and pressing up and down welding wheels of the welding machine, simultaneously, enabling a milling cutter to be tightly attached to the surface of the welding wheel and rapidly rotated and pressed down, and enabling a C-shaped frame to move to a transmission side from an operation side, generating heat (acting on a lap joint area) on the resistance of the strip steel and the centralized resistance of a contact part between the strip steel and the welding wheel, so that a zinc layer in the lap joint area is heated and volatilized, an original iron-based substrate is exposed, meanwhile, the iron-based substrate does not form a welding phenomenon due to insufficient heating, the volatilized zinc layer is attached to the surface of the welding wheel, and the zinc layer on the surface of the welding wheel can be rapidly removed through the milling cutter rotating at a high speed, thereby reducing the influence of the zinc layer on the surface quality and the conductivity of the welding wheel;
after the first wheel welding operation is completed and the evaporated zinc layer is heated and melted, the exposed iron-based substrate has good weldability, the exposed iron-based substrate is not influenced by the zinc layer in the re-welding process, the C-shaped frame is ensured to be not actuated when returning to the original position of the operation side from the transmission side, the welding operation is performed again, the welding operation is set, the upper and lower welding wheels of the welding machine are rotationally pressed down, and simultaneously the welding wheel milling cutter is rotationally pressed down while being closely attached to the welding wheels, so that the exposed iron-based strip steel is heated, melted, cooled and crystallized, and finally the strip steel is welded;
according to the method, through two-wheel welding operation, the zinc layer is melted and evaporated through self-generated resistance heating in the first wheel, the iron-based substrate is exposed, and good welding seams are obtained by welding the iron-based substrate in the second wheel, so that the influence of the zinc layer on the surface of the strip steel on the welding process can be effectively avoided;
preparing a narrow lap welding device, wherein the narrow lap welding device specifically comprises: the two online welding wheel grinding milling cutters are fixed on the C-shaped frame member, the upper milling cutter and the lower milling cutter are pressed down simultaneously along with the rotation of the upper welding wheel and the lower welding wheel of the welding machine and are clung to the surface of the welding wheel to rotate rapidly, the rotation speed of the welding wheel is 4 m/min-15 m/min, the rotation speed of the milling cutter is 30m/min, and the upper milling cutter and the lower milling cutter are provided with a chip guide pipe and a chip storage groove;
the narrow overlap welding equipment sets welding operation parameters after the welding machine double-shears cut the belt head and the belt tail, the C-shaped frame moves from the operation side to the transmission side for the first welding operation, the moving speed of the C-shaped frame is 4 m/min-15 m/min, when the C-shaped frame moves from the transmission side to the operation side again for the second welding operation, the belt head and the belt tail are not sheared, the second welding operation is directly carried out, after the welding is finished, the C-shaped frame returns to the original position,
the parameters of the two welding operations are directly given after the head and the tail of the double-cut-off tape are cut, and the welding operation parameters are not required to be set during the second welding operation;
experimental study is carried out on welding operation parameters, a narrow lap welding method is adopted for welding operation, and the two welding operation parameters are as follows: the welding current is 6-30 KA, the welding speed is 4-15 m/min, the welding pressure is 400-3500 daN, the pressure of a rolling wheel is 500-5000 daN, the lap joint amount of an operation side is 0.5-3.0 mm, the lap joint amount of a transmission side is 0.5-3.0 mm, the lap joint amount of the operation side of two welding operations needs to be set consistently, the lap joint amount of the transmission side needs to be consistently maintained, and meanwhile, the lap joint amount of the transmission side needs to be larger than the lap joint amount of the operation side by 0.3-0.9 mm;
the steel grade number of the galvanized strip steel substrate comprises: CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, IF-HSS, P-HSS and dual phase steels DP600, DP800;
the thickness of the zinc layer of the strip steel substrate is 30g/m < 2 > -140 g/m < 2 >.
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| CN202210998717.4A CN115351452B (en) | 2022-08-19 | 2022-08-19 | Galvanized strip steel welding device and butt welding method |
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| CN114633009A (en) * | 2022-03-30 | 2022-06-17 | 鞍钢股份有限公司 | Method for reducing strip breakage of narrow lap weld of aluminum-zinc plated product |
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| JPH0847782A (en) * | 1994-08-03 | 1996-02-20 | Kawasaki Heavy Ind Ltd | Method and device for seam welding |
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| CN115351452A (en) | 2022-11-18 |
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