CN112775627A - Welding method for plate splicing welding channel steel - Google Patents
Welding method for plate splicing welding channel steel Download PDFInfo
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- CN112775627A CN112775627A CN202011610737.7A CN202011610737A CN112775627A CN 112775627 A CN112775627 A CN 112775627A CN 202011610737 A CN202011610737 A CN 202011610737A CN 112775627 A CN112775627 A CN 112775627A
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- 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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
Abstract
The invention provides a welding method of plate-spliced and welded channel steel, which relates to the technical field of steel structure manufacturing, is applied to a full penetration weld joint between a web plate and a wing plate in the plate-spliced and welded channel steel, and comprises the following steps: a V-shaped groove is formed in the contact front face of the wing plate and the web plate; adopting carbon dioxide gas shielded welding at the position of the V-shaped groove; carrying out full penetration welding on the contact back of the wing plate and the web plate by adopting submerged arc welding; the method can solve the technical problems of increased material and energy consumption, low efficiency, influence on the quality of the welding seam, no environmental protection, increased process steps and high welding cost in the prior art that the 100 percent UT flaw detection of the welding seam is qualified under the condition of avoiding a carbon arc gouging back gouging process.
Description
Technical Field
The invention relates to the technical field of steel structure manufacturing, in particular to a welding method for plate-spliced channel steel.
Background
The material of hot rolling channel-section steel is Q235B, but the hot rolling channel-section steel can't satisfy the steel construction that the atress is big, when consequently the steel construction that the atress is big needs the channel-section steel cross-section, all can use the board to piece together the welding channel-section steel, wherein the higher Q345B of intensity is chooseed for use to the material of board piece welding channel-section steel, especially in large-scale thermal generator group boiler steel frame hanging beam and hot junction support project, board piece welding channel-section steel use amount is.
When the plate splicing welding channel steel is manufactured, full penetration welding between a web plate and a wing plate is generally required, and the welding process for welding seams between the web plate and the wing plate of the plate splicing welding channel steel in the prior art comprises the following two steps: one is a carbon arc gouging back gouging process after open bevel welding, and the other is a process of adopting a ceramic liner for welding with a gap left by the open bevel.
However, in the prior art, the carbon arc gouging and polishing process is added in the process of carbon arc gouging back chipping after open bevel welding, so that the material and energy consumption is increased, the welding time is long, the efficiency is low, the grinding is not thorough, the carburization is easy to cause to influence the quality of a weld joint, and the noise and strong light pollution are great, so that the problem of environmental pollution is not caused; the process of forming the groove and leaving the gap to weld by using the ceramic liner has high requirements on the preparation of the groove, the deposition amount of the welding seam is increased, the procedures of laying and cleaning the ceramic liner are required to be added, the cost of the ceramic liner is higher, and the problem of high welding cost can be caused.
Disclosure of Invention
The invention aims to provide a welding method for plate-spliced and welded channel steel, which aims to solve the technical problems of material and energy consumption increase, low efficiency, influence on weld quality, environmental pollution, process step increase and high welding cost in the prior art.
The invention provides a welding method of a plate splicing welding channel steel, which is applied to a full penetration welding seam between a web plate and a wing plate in the plate splicing welding channel steel and comprises the following steps:
a V-shaped groove is formed in the contact front face of the wing plate and the web plate;
adopting carbon dioxide gas shielded welding at the position of the V-shaped groove;
and carrying out full penetration welding on the contact back of the wing plate and the web plate by adopting submerged arc welding.
In the preferred embodiment of the invention, the angle of the V-shaped groove ranges from 55 degrees to 65 degrees;
the thickness range of the truncated edge of the V-shaped groove is 0-2 mm.
In a preferred embodiment of the present invention, before the step of welding the V-groove with carbon dioxide gas, the method further comprises:
fixing the wing plate and the web plate by using a positioning welding line;
wherein the spot welding position of the tack weld is positioned on the V-shaped groove side.
In the preferred embodiment of the invention, when the contact back surface of the wing plate and the web plate is subjected to full penetration welding by adopting submerged arc welding, the method further comprises the following steps:
turning the web plate and the wing plate so that the web plate is arranged at an angle of 45 degrees with the ground;
and (3) offsetting the center of the welding wire to the web plate direction by a preset distance from the intersection point of the web plate and the wing plate.
In the preferred embodiment of the invention, the preset distance range of the deviation of the welding wire center from the intersection point of the web plate and the wing plate to the web plate direction is 2mm-4 mm.
In a preferred embodiment of the present invention, the method further comprises the following steps:
when the V-shaped groove side welding channel is welded, welding is carried out according to preset welding current, welding voltage, welding speed, welding wire diameter and gas flow.
In a preferred embodiment of the present invention, when welding the backing bead on the V-shaped slope side:
the welding current range is as follows: 110A-200A; the welding voltage range is as follows: 20V-26V; the welding speed range is as follows: 20cm/min-35 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 15L/min.
In a preferred embodiment of the present invention, when welding the non-bottoming bead on the V-shaped slope side:
the welding current range is as follows: 180A-250A; the welding voltage range is as follows: 24V-35V; the welding speed range is as follows: 25cm/min-45 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 20L/min.
In the preferred embodiment of the invention, when the contact back of the wing plate and the web plate is welded by adopting submerged arc welding, the welding is carried out by preset welding current, welding voltage, welding speed and welding wire diameter;
wherein, when welding the non-groove weld bead:
the welding current range is as follows: 600A-670A; the welding voltage range is as follows: 28V-36V; the welding speed range is as follows: 40cm/min-55 cm/min; the diameter of the welding wire is 4 mm.
In a preferred embodiment of the present invention, the method further comprises the following steps:
the measures of reserve reversible deformation, rigid fixation and the like are adopted, and the welding angular deformation of wing plates and the integral side bending of channel steel are reduced.
The invention provides a welding method of a plate splicing welding channel steel, which is applied to a full penetration welding seam between a web plate and a wing plate in the plate splicing welding channel steel, and comprises the following steps: a V-shaped groove is formed in the contact front face of the wing plate and the web plate; adopting carbon dioxide gas shielded welding at the position of the V-shaped groove; carrying out full penetration welding on the contact back of the wing plate and the web plate by adopting submerged arc welding; the method can solve the technical problems of increased material and energy consumption, low efficiency, influence on the quality of the welding seam, no environmental protection, increased process steps and high welding cost in the prior art that the 100 percent UT flaw detection of the welding seam is qualified under the condition of avoiding a carbon arc gouging back gouging process.
Compared with the technology of carbon arc gouging back gouging after the open-bevel welding, the welding method of the plate splicing welding channel steel provided by the invention comprises the following steps: the problems that carbon deposition is easily caused by carbon arc gouging back chipping and the quality of a welding seam is influenced are solved; the welding deposit amount of the welding seam is reduced by more than 25 percent, and welding materials can be saved by more than 25 percent; carbon rods are not used, and more than 3 yuan is saved in each meter of welding line; the back gouging process and the polishing process of a back gouging polishing machine are omitted, and the efficiency is improved by over 50 percent; the occupational disease hazard of carbon arc gouging arc light and noise to welders is avoided; the labor intensity of welders is greatly reduced; compared with the process of forming a groove and leaving a gap and welding by using a ceramic liner: the method has the advantages of low requirement on groove preparation, reduction of welding seam deposition by 20%, reduction of ceramic liner cost, reduction of labor cost of procedures of laying and cleaning the ceramic liner, prediction of 30% improvement of efficiency and 35% saving of cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic cross-sectional structure view of a plate-spliced welded channel in a welding method for the plate-spliced welded channel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a V-groove formed in the welding method for plate-spliced welded channel steel according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of submerged arc welding in the welding method for the plate-spliced welded channel steel according to the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a submerged arc welding process in the welding method of the plate-spliced welding channel steel provided by the embodiment of FIG. 3;
FIG. 5 is a partial enlarged structure of a plate-splicing welded channel steel in the welding method for submerged arc welding according to the embodiment of FIG. 4;
fig. 6 is a welding process table of each position in the welding method for the plate-spliced welded channel steel according to the embodiment of the present invention.
Icon: 100-a web; 200-wing plate; a 300-V groove; 400-welding wire.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, the welding method for the plate-spliced channel steel provided in this embodiment is applied to a full penetration weld between a web 100 and a wing plate 200 in the plate-spliced channel steel, and includes the following steps: a V-shaped groove 300 is arranged on the contact front surface of the wing plate 200 and the web plate 100; adopting carbon dioxide gas shielded welding at the position of the V-shaped groove 300; full penetration welding is performed by submerged arc welding on the contact back surfaces of the wing plate 200 and the web plate 100.
It should be noted that the plate-splicing welded channel steel can be formed by splicing two wing plates 200 and a web plate 100, wherein the two wing plates 200 are located on two sides of the web plate 100, and each wing plate 200 is perpendicular to the web plate 100, and then the wing plates 200 and the web plate 100 are fixed by welding, so that the plate-splicing welded channel steel is formed.
In this embodiment, pterygoid lamina 200 and web 100 in the board piece together welding channel-section steel can all adopt Q345B's material, and then can be better to the use of large-scale thermal generator set boiler steelframe supporting beam and hot junction support project board piece together welding channel-section steel.
The welding method of the plate-splicing welded channel steel provided by the embodiment is applied to a full penetration weld between a web 100 and a wing plate 200 in the plate-splicing welded channel steel, and comprises the following steps: a V-shaped groove 300 is arranged on the contact front surface of the wing plate 200 and the web plate 100; adopting carbon dioxide gas shielded welding at the position of the V-shaped groove 300; performing full penetration welding on the contact back surfaces of the wing plate 200 and the web plate 100 by adopting submerged arc welding; the method can solve the technical problems of increased material and energy consumption, low efficiency, influence on the quality of the welding seam, no environmental protection, increased process steps and high welding cost in the prior art that the 100 percent UT flaw detection of the welding seam is qualified under the condition of avoiding a carbon arc gouging back gouging process.
Compared with the technology of carbon arc gouging back gouging after the open-bevel welding, the welding method of the plate-spliced welding channel steel provided by the embodiment has the advantages that: the problems that carbon deposition is easily caused by carbon arc gouging back chipping and the quality of a welding seam is influenced are solved; the welding deposit amount of the welding seam is reduced by more than 25 percent, and welding materials can be saved by more than 25 percent; carbon rods are not used, and more than 3 yuan is saved in each meter of welding line; the back gouging process and the polishing process of a back gouging polishing machine are omitted, and the efficiency is improved by over 50 percent; the occupational disease hazard of carbon arc gouging arc light and noise to welders is avoided; the labor intensity of welders is greatly reduced; compared with the process of forming a groove and leaving a gap and welding by using a ceramic liner: the method has the advantages of low requirement on groove preparation, reduction of welding seam deposition by 20%, reduction of ceramic liner cost, reduction of labor cost of procedures of laying and cleaning the ceramic liner, prediction of 30% improvement of efficiency and 35% saving of cost.
Based on the above embodiment, further, in the preferred embodiment of the present invention, the angle of the V-groove 300 is in the range of 55 ° -65 °; the blunt edge thickness of the V-groove 300 ranges from 0 to 2 mm.
In this embodiment, the angle of the V-groove 300 is determined in the range of 60 ° ± 5 °, and preferably, the optimal opening angle of the V-groove 300 is 60 °; the thickness of the truncated edge of the V-groove 300 is specifically set according to the web 100 with different thicknesses.
The carbon dioxide arc welding is adopted at the position of the V-shaped groove 300, and the carbon dioxide arc welding has small linear energy, so that the welding deformation can be reduced; the reason why the submerged arc welding is used without forming a groove is that the submerged arc welding is used for full penetration welding on the contact back surface of the wing plate 200 and the web 100: the advantage of large fusion depth of submerged-arc welding is utilized, the submerged-arc welding current is selectively increased or decreased according to the plate thickness, the penetration is ensured, if a groove is formed on the back, the selection range of the submerged-arc welding current is limited, and the welding quality can be ensured because the shape coefficient of a submerged-arc welding seam is more than 1.3.
In order to avoid the influence of the tack weld on the penetration of the submerged arc welding, in a preferred embodiment of the present invention, before the step of using carbon dioxide gas for arc welding at the position of the V-groove 300, the method further includes: fixing the wing plate 200 and the web plate 100 by using a positioning welding seam; wherein, the spot welding position of the tack weld is located at the side of the V-groove 300.
In the preferred embodiment of the present invention, the full penetration welding of the contact back surfaces of the wing plate 200 and the web 100 by submerged arc welding further comprises the following steps: turning the web 100 and the wing plate 200 so that the web 100 is arranged at 45 ° to the ground; the center of the welding wire 400 is offset by a predetermined distance in the direction of the web 100 from the intersection point of the web 100 and the wing plate 200.
In the preferred embodiment of the present invention, the center of the welding wire 400 is offset from the intersection point of the web 100 and the wing plate 200 toward the web 100 by a predetermined distance ranging from 2mm to 4 mm.
In this embodiment, after preliminarily fixing pterygoid lamina 200 and web 100 through spot welding and carbon dioxide gas shielded arc welding, put overall structure on V type support body this moment to can ensure that web 100 can become 45 with ground on the basis of fixed pterygoid lamina 200 and web 100, and then guarantee the welding seam leg symmetry.
In addition, it should be noted that, in the prior art, the center of the welding wire 400 for submerged arc welding is aligned with the intersection point position of the web 100 and the wing plate 200, but the weld bead penetration is mainly embodied on the flange plate, and the connection position between the web 100 and the flange plate is not fused with emphasis; in order to alleviate the above problems, the method for welding a plate-to-plate welded channel according to this embodiment performs welding by offsetting the center of the welding wire 400 by a predetermined distance in the direction of the web 100 during submerged arc welding, and preferably, the offset distance in the direction of the web 100 is 3mm, so that submerged arc welding can intensively fuse the connection portion between the web 100 and the flange plate, thereby ensuring penetration of the weld.
In the present embodiment, the predetermined distance by which the center of the welding wire 400 is shifted in the direction of the web 100 from the intersection point of the web 100 and the wing plate 200 is determined in the range of 3mm ± 1mm, and preferably, the predetermined distance by which the center of the welding wire 400 is shifted in the direction of the web 100 from the intersection point of the web 100 and the wing plate 200 is 3 mm.
In a preferred embodiment of the present invention, the method further comprises the following steps: when welding the weld way on the side of the V-shaped groove 300, welding is carried out according to preset welding current, welding voltage, welding speed, the diameter of a welding wire 400 and gas flow.
In a preferred embodiment of the present invention, when welding the backing bead on the V-shaped slope side: the welding current range is as follows: 110A-200A; the welding voltage range is as follows: 20V-26V; the welding speed range is as follows: 20cm/min-35 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 15L/min.
In a preferred embodiment of the present invention, when welding the non-bottoming bead on the V-shaped slope side: the welding current range is as follows: 180A-250A; the welding voltage range is as follows: 24V-35V; the welding speed range is as follows: 25cm/min-45 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 20L/min.
In the preferred embodiment of the present invention, when the contact back surfaces of the wing plate 200 and the web plate 100 are welded by submerged arc welding, welding is performed at a preset welding current, welding voltage, welding speed and welding wire 400 diameter; wherein, when welding the non-groove weld bead: the welding current range is as follows: 600A-670A; the welding voltage range is as follows: 28V-36V; the welding speed range is as follows: 40cm/min-55 cm/min; the wire 400 has a diameter of 4 mm.
Optionally, when the web 100 of the plate-spliced and welded channel steel has a thickness ranging from 12mm to 20mm, the wing plate 200 has a thickness ranging from 20mm to 40mm, and the material is Q345B, the specific welding process is as shown in fig. 6.
Wherein, the welding current, the welding voltage, the welding speed and the extension length of the welding wire 400 directly influence the penetration depth, the surplus height and the welding seam width of a welding bead, technological parameters must be strictly executed, and the welding speed must be measured according to the actual measurement and cannot be estimated; thereby preventing the occurrence of incomplete penetration and the influence on the quality of the welding seam.
In a preferred embodiment of the present invention, the method further comprises the following steps: measures such as reserved reversible deformation and rigid fixation are adopted, and welding angular deformation of the wing plate 200 and integral side bending of the channel steel are reduced.
In the embodiment, in the manufacturing and welding process of the plate-splicing welded channel steel, the measures of reserved reversible deformation and rigid fixation are adopted, so that the welding angular deformation of the wing plate 200 and the integral bending of the channel steel can be reduced, the workload of correction after welding is reduced, and the manufacturing design is more reasonable; since the reserved reversible deformation and rigid fixation can be realized through the support frame, the details are not described here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A welding method of plate-splicing welded channel steel is applied to a full penetration welding seam between a web plate and a wing plate in the plate-splicing welded channel steel, and is characterized by comprising the following steps:
a V-shaped groove is formed in the contact front face of the wing plate and the web plate;
adopting carbon dioxide gas shielded welding at the position of the V-shaped groove;
and carrying out full penetration welding on the contact back of the wing plate and the web plate by adopting submerged arc welding.
2. The welding method of the plate-spliced welding channel steel according to claim 1, wherein the angle range of the V-shaped groove is 55-65 degrees;
the thickness range of the truncated edge of the V-shaped groove is 0-2 mm.
3. The method for welding the plate-spliced welding channel steel according to claim 1, wherein before the step of welding the V-shaped groove by using carbon dioxide gas, the method further comprises the following steps of:
fixing the wing plate and the web plate by using a positioning welding line;
wherein the spot welding position of the tack weld is positioned on the V-shaped groove side.
4. A method for welding a plate-spliced channel as claimed in claim 3, wherein the full penetration welding is performed by submerged arc welding on the contact back surfaces of the wing plate and the web plate, and the method further comprises the steps of:
turning the web plate and the wing plate so that the web plate is arranged at an angle of 45 degrees with the ground;
and (3) offsetting the center of the welding wire to the web plate direction by a preset distance from the intersection point of the web plate and the wing plate.
5. The method for welding the plate-spliced welding channel steel as claimed in claim 4, wherein the preset distance range of the center of the welding wire which is deviated from the web plate direction by the intersection point of the web plate and the wing plate is 2mm-4 mm.
6. The method for welding a plate-spliced welded steel channel according to any one of claims 1 to 5, further comprising the steps of:
when the V-shaped groove side welding channel is welded, welding is carried out according to preset welding current, welding voltage, welding speed, welding wire diameter and gas flow.
7. The method of welding a plate-joined welded channel according to claim 6, wherein when welding a backing bead on the V-shaped groove side:
the welding current range is as follows: 110A-200A; the welding voltage range is as follows: 20V-26V; the welding speed range is as follows: 20cm/min-35 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 15L/min.
8. The method of welding a plate-joined welded channel according to claim 6, wherein when welding a non-backing bead on the V-shaped groove side:
the welding current range is as follows: 180A-250A; the welding voltage range is as follows: 24V-35V; the welding speed range is as follows: 25cm/min-45 cm/min; the diameter of the welding wire is 1.2mm, and the gas flow is 20L/min.
9. The method for welding a plate-spliced channel steel as claimed in claim 6, wherein when the contact back surfaces of the wing plate and the web plate are welded by submerged arc welding, welding is performed at a preset welding current, welding voltage, welding speed and welding wire diameter;
wherein, when welding the non-groove weld bead:
the welding current range is as follows: 600A-670A; the welding voltage range is as follows: 28V-36V; the welding speed range is as follows: 40cm/min-55 cm/min; the diameter of the welding wire is 4 mm.
10. The method for welding a plate-spliced welded steel channel according to claim 6, further comprising the steps of:
the welding angular deformation and the integral bending of the wing plate are reduced by reserving a mode of reversible deformation or rigid fixation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114833427A (en) * | 2022-06-08 | 2022-08-02 | 安徽精工钢结构有限公司 | Welding method for column limbs of groove-shaped section of building steel structure |
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