CN110640277A - Q420 high-strength steel thick plate non-preheating double-wire submerged-arc welding process - Google Patents
Q420 high-strength steel thick plate non-preheating double-wire submerged-arc welding process Download PDFInfo
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- CN110640277A CN110640277A CN201910942861.4A CN201910942861A CN110640277A CN 110640277 A CN110640277 A CN 110640277A CN 201910942861 A CN201910942861 A CN 201910942861A CN 110640277 A CN110640277 A CN 110640277A
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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
- B23K9/18—Submerged-arc welding
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
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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
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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
- B23K9/235—Preliminary treatment
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The invention provides a Q420 high-strength steel thick plate non-preheating twin-wire submerged arc welding process, which comprises the following steps of: step 1, processing an X-shaped welding groove at a welding position of a Q420 high-strength steel thick plate serving as a welding plate, and then cleaning an oxide layer on the surface of the X-shaped welding groove and impurities within the range of 20-30mm around the X-shaped welding groove; step 2, welding a positioning welding seam at the X-shaped welding slope through semi-automatic CO2 gas shielded welding; step 3, respectively installing an arc striking plate and an arc extinguishing plate at two ends of the X-shaped welding groove, wherein the material, the thickness and the groove parameters of the arc striking plate and the arc extinguishing plate are the same as those of the welding plate; step 4, centering the electrode and welding the center of the groove, and adjusting the angle and distance of a welding gun; and 5, firstly welding the front welding seam by matching proper welding parameters, and filling the back welding seam after the front groove welding is finished. The invention can ensure the welding quality without preheating and postweld heat treatment, thereby reducing the number of welding passes and improving the welding efficiency.
Description
Technical Field
The invention relates to a welding process of high-strength steel, which is suitable for the fields of welding of steel structures of buildings, tunnels and the like, in particular to a non-preheating double-wire submerged arc welding process of a thick Q420 high-strength steel plate.
Background
The Q420 high-strength steel is low-alloy high-strength structural steel with the yield strength grade of more than or equal to 420MPa, and is already applied to steel box girder structures and truss structures of bridge buildings, steel shell structures of tunnel buildings and the like.
In the welding of jointed boards of Q420 high-strength steel, welding modes of semi-automatic carbon dioxide gas shielded welding and single wire submerged arc welding are generally adopted, however, the welding heat input of the welding modes is low, the welding filling amount of a single welding seam is limited, for a Q420 high-strength steel thick plate with the thickness of 40mm, multiple layers and multiple welding seams are generally required, and strict slag removal work is required among the welding seams to avoid slag inclusion in the welding seams and seriously hinder the improvement of the welding efficiency. In addition, in the welding process of the Q420 high-strength steel thick plate, because the restraint degree is large, the Q420 high-strength steel thick plate has fast heat dissipation and high cooling speed, and is easy to form cold cracks in the welded joint, a process measure of pre-welding is usually required, and the process of pre-welding needs to consume a large amount of working hours and cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a Q420 high-strength steel thick plate double-wire submerged arc welding process without preheating, which can reduce the number of welding passes and improve the welding efficiency without preheating and postweld heat treatment under the condition of ensuring the welding quality.
The technical scheme of the invention is realized as follows:
a Q420 high strength steel thick plate non-preheating twin-wire submerged arc welding process comprises the following steps:
step 1, processing an X-shaped welding groove at a welding position where a welding plate is a Q420 high-strength steel thick plate, wherein corresponding parameters of the X-shaped welding groove are as follows: the angle of the front groove is 55-65 degrees, the angle of the back groove is 65-75 degrees, the depth of the back groove is 1/3 of the plate thickness, the truncated edge is 9-11 mm, and the root gap is 0-1 mm; after the machining is finished, cleaning an oxide layer of the X-shaped welding bevel face and impurities within the range of 20-30mm around the X-shaped welding bevel;
step 3, respectively installing an arc striking plate and an arc extinguishing plate at two ends of the X-shaped welding groove, wherein the material, the thickness and the groove parameters of the arc striking plate and the arc extinguishing plate are the same as those of the welding plate;
step 4, centering the front welding wire and the rear welding wire to weld the center of the groove, and adjusting the angle and the distance of a welding gun to enable the front wire electrode to tilt forwards by 0 degrees, wherein the distance from a front wire conductive nozzle to a workpiece is 35 mm; the back wire electrode is inclined backwards by 17-23 degrees, and the distance from the back wire conductive nozzle to the workpiece is 40 mm; the distance between the front wire electrode and the rear wire electrode is 30-35 mm;
step 5, welding a front welding seam, and filling a back welding seam after the front groove is welded; wherein, the welding parameters are as follows:
when the front surface is subjected to backing weld bead welding, the front wire welding current is 650-670A, the front wire welding voltage is 32-34V, and the front wire welding speed is 65-70 cm/min; the welding current of the rear wire is 600-620A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 65-70 cm/min;
when the front surface is filled and the cover surface is welded by the welding way, the welding current of the front wire is 670-; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 37-39V, and the welding speed of the rear wire is 65-70 cm/min;
when the back bottoming bead is welded, the front wire welding current is 950-970A, the front wire welding voltage is 32-34V, and the front wire welding speed is 62-68 cm/min; the welding current of the rear wire is 620-640A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 62-68 cm/min;
when the back filling weld bead is welded, the welding current of the front wire is 650-670A, the welding voltage of the front wire is 32-34V, and the welding speed of the front wire is 70-75 cm/min; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 70-75 cm/min;
when the back cover surface is welded, the welding current of the front wire is 640-660A, the welding voltage of the front wire is 31-33V, and the welding speed of the front wire is 65-70 cm/min; the welding current of the rear wire is 550-570A, the welding voltage of the rear wire is 34-36V, and the welding speed of the rear wire is 65-70 cm/min;
and 6, cutting off arc striking plates and arc extinguishing plates at two ends of the welding line after the welding line is cooled.
Further, in step 4, the rear wire electrode is tilted back by 20 degrees; the distance between the front wire electrode and the rear wire electrode is 35 mm; the length of the welding wire extending out of the contact tip is 35-45 mm.
Further, in the step 5, the adopted welding wire meets the specified requirement of the H08MnMoA model in GB/T12470 during welding.
Further, in the step 5, double power supplies and double electrodes are adopted for welding, wherein the front wire is welded by adopting a direct current power supply, and the rear wire is welded by adopting an alternating current power supply.
Further, in step 5, before welding the back weld, the root of the groove is cleaned in a mode of carbon arc gouging and mechanical polishing, and incomplete penetration and fusion of the root and slag defects are eliminated.
Furthermore, the inter-road temperature is 100-230 ℃ in the welding process, and the welding bead joints need to be staggered by 50mm in the welding process
Further, in the step 2 and the step 3, the flux-cored wire is used in the welding process, and the model number of the flux-cored wire is GB/T17493-.
Compared with the prior art, the invention has the following advantages: according to the invention, through the design of the welding joint, steel assembly and tack welding are strictly carried out, the proper angle and the proper distance of the welding gun are adjusted, the proper welding material is selected, and the proper welding process parameters are matched to complete the welding of the Q420 high-strength steel, so that preheating and postweld heat treatment are not needed under the condition of ensuring the welding quality, the number of welding passes is reduced, and the welding efficiency is improved.
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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a welding groove of a Q420 high-strength steel thick plate;
FIG. 2 is a schematic structural diagram of a cleaning area before welding of a Q420 high-strength steel thick plate;
FIG. 3 is a schematic structural view of Q420 high strength steel thick plate for assembling and tack welding;
FIG. 4 is a diagram of a Q420 welding electrode configuration;
fig. 5 is a schematic structural view of a bead arrangement.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the invention discloses a Q420 high-strength steel thick plate non-preheating twin-wire submerged arc welding process, which is mainly applied to a Q420 high-strength steel thick plate with the thickness of 38-40mm, and specifically comprises the following steps:
step 1, processing an X-shaped welding groove at a welding position where a welded plate is a Q420 high-strength steel thick plate, specifically referring to fig. 1, wherein corresponding parameters of the X-shaped welding groove are respectively: the angle of the front groove is 55-65 degrees, the angle of the back groove is 65-75 degrees, the depth of the back groove is 1/3 of the plate thickness, the truncated edge is 9-11 mm, and the root gap is 0-1 mm; after the machining is finished, cleaning an oxide layer of the X-shaped welding bevel face and impurities within the range of 20-30mm around the X-shaped welding bevel, and particularly referring to FIG. 2;
the impurities in the range of 20-30mm around the X-shaped welding groove comprise rust, moisture, oil stain or other impurities, wherein the impurities of the oxide layer and the rust can be cleaned in a mechanical polishing mode, the impurities of the moisture and the oil stain can be removed by flame baking, so that the impurities are prevented from entering a welding line area and reducing the crack resistance of welding line metal, the impurities of the moisture and the oil stain can be removed by flame baking, and the impurities of the oxide layer and the rust are cleaned in the mechanical polishing mode.
The angle setting of the front groove is favorable for ensuring separation of slag in the welding process, slag knocking forming is easy to achieve, the depth of the groove is increased due to the fact that the back of the groove is provided with the carbon arc gouging, and the root welding bead forming is ensured due to the fact that the groove is too small to adopt a large groove angle after the carbon gouging. The invention is a double-wire submerged arc welding, the welding penetration is larger, and in order to ensure that a steel plate is not welded through, the truncated edge is 9-11 mm, the root gap is 0-1mm, and meanwhile, the groove design can effectively reduce the sectional area of the groove, reduce the number of welding passes and improve the welding efficiency.
specifically, when welding is performed, welding wires with matched strength are selected according to the strength grade of steel, so that the welding wires adopted in the step meet the specified requirements of the H08MnMoA model in GB/T12470.
Specifically, in the step 2, the adopted welding wire is a modern flux-cored welding wire of SC-81K2H, and the diameter specification is 1.2 mm. Of course, the welding materials used in the present invention are not limited to the modern SC-81K2H flux cored wire.
Specifically, in step 2, the length of the positioning welding line is 50-60mm, the distance between the welding lines is 400-500mm, and the thickness is about the thickness of the parent metal 1/3. When the thickness of the positioning welding is smaller than the plate thickness 1/3, the positioning welding point is difficult to provide enough restraint stress, and the positioning welding point is easy to break and fail under the stress action in the welding process; meanwhile, when the tack weld thickness is much greater than 1/3, it is disadvantageous for the subsequent welding that it takes a lot of man-hours to perform grinding. For a Q420 high-strength steel thick plate with the thickness of 38-40mm, when the length of a fixed welding seam is less than 30mm, the welding seam quality is difficult to guarantee due to the fact that the welding distance is too short; when the length of the welding seam is too long, the welding workload of the tack welding is increased, which is not beneficial to high-efficiency welding; enough positioning welding spots can provide enough restraint force for ensuring the welding lines, the welding line interval cannot be too large, and meanwhile, the difficulty of delaying the subsequent submerged-arc welding for avoiding too many positioning welding spots is avoided.
Step 3, respectively installing an arc striking plate and an arc extinguishing plate at two ends of the X-shaped welding groove, wherein the material, the thickness and the groove parameters of the arc striking plate and the arc extinguishing plate are the same as those of the welding plate;
specifically, the flux-cored wire adopted during welding is GB/T17493-2008E 551T1-X CX.
In the embodiment of the invention, the arc striking plate and the arc extinguishing plate are Q420 high-strength steel thick plates, the thickness and the groove size of the arc striking plate and the arc extinguishing plate are the same as those of the welding plate in the embodiment of the invention, the stability of a formal welding seam welding process can be effectively ensured, and the welding defects at the beginning end and the end of the formal welding seam are avoided.
Step 4, centering the front welding wire and the rear welding wire to the center of the welding groove, and adjusting the angle and the distance of a welding gun, specifically referring to fig. 4, so that the front wire electrode is inclined forwards by 0 degrees, and the distance from the front wire conductive nozzle to the workpiece is 35 mm; the back wire electrode is inclined backwards by 17-23 degrees, and the distance from the back wire conductive nozzle to the workpiece is 40 mm; the distance between the front wire electrode and the rear wire electrode is 30-35 mm;
in order to ensure the maximum penetration, the front wire electrode is vertical to the workpiece, and meanwhile, tests show that when the rear wire is inclined backwards by 20 degrees, the weld joint is well formed; the distance between the contact tip and the workpiece is too long, the welding wire is easy to deviate from the central line of the welding seam, the distance between the contact tip and the workpiece is too short, and the contact tip is easy to burn in the welding process. The front wire electrode and the rear wire electrode share one welding molten pool, when the distance is smaller than 20mm, the two electrodes can stir the molten pool together to deteriorate a welding joint, when the distance is larger than 50mm, the front wire and the rear wire are double-molten pools, secondary welding is carried out after welding seam metal is solidified, and the performance and the forming of the joint are poor. The welding quality can be effectively ensured by adopting the welding parameters.
Specifically, in the step 4, when the rear wire electrode is tilted backwards by 20 degrees, the distance between the front wire electrode and the rear wire electrode is 35mm, and the extension length of the welding wire is 35-45mm, the welding effect is better.
Step 5, welding a front welding seam, and filling a back welding seam after the front groove is welded; before welding a back welding seam, cleaning the root of the groove by adopting a carbon arc gouging and mechanical grinding mode, and removing incomplete penetration and fusion of the root and slag defects.
When welding was performed, the welding parameters are shown in the following table:
as can be seen from the above table:
when the front surface is subjected to backing weld bead welding, the front wire welding current is 650-670A, the front wire welding voltage is 32-34V, and the front wire welding speed is 65-70 cm/min; the welding current of the rear wire is 600-620A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 65-70 cm/min;
when the front surface is filled and the cover surface is welded by the welding way, the welding current of the front wire is 670-; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 37-39V, and the welding speed of the rear wire is 65-70 cm/min;
when the back bottoming bead is welded, the front wire welding current is 950-970A, the front wire welding voltage is 32-34V, and the front wire welding speed is 62-68 cm/min; the welding current of the rear wire is 620-640A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 62-68 cm/min;
when the back filling weld bead is welded, the welding current of the front wire is 650-670A, the welding voltage of the front wire is 32-34V, and the welding speed of the front wire is 70-75 cm/min; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 70-75 cm/min;
when the back cover surface is welded, the welding current of the front wire is 640-660A, the welding voltage of the front wire is 31-33V, and the welding speed of the front wire is 65-70 cm/min; the welding current of the rear wire is 550-570A, the welding voltage of the rear wire is 34-36V, and the welding speed of the rear wire is 65-70 cm/min.
In the embodiment of the invention, the welding is carried out by taking Lincoln PREMIER WELD Ni1K as a welding wire and PREMIER WELDBF-40H as a welding flux. And before welding, the flux needs to be placed in an environment at 350 ℃ for baking for 1h to ensure the dryness of the flux.
In the back-side weld filling, the weld pass sequence is as shown in fig. 5.
In the embodiment of the invention, double power supplies and double electrodes are adopted for welding, wherein the front wire is welded by adopting a direct current power supply, the rear wire is welded by adopting an alternating current power supply, the penetration depth of the direct current power supply is large, a workpiece can be effectively welded through, and the welding seam forming is ensured by the alternating current of the rear wire.
And 6, cutting off arc striking plates and arc extinguishing plates at two ends of the welding line after the welding line is cooled.
In the welding process, the inter-pass temperature is kept between 100 ℃ and 230 ℃, slag is removed after welding of each welding seam is finished so as to ensure the welding quality, and the joints of each welding pass need to be staggered by 50mm during welding, so that the defect superposition, stress concentration and overhigh welding pass at the joints are avoided. If the temperature between the roads is higher than 230 ℃, the welding joint is heated seriously, and the mechanical property of the welding joint can be directly influenced, so that the strength is reduced and the toughness is reduced; the inter-track temperature is between 100 ℃ and 230 ℃, which belongs to the temperature range recorded by the test, and the data is more accurate.
Test detection
After the welding is finished for 24 hours, magnetic powder detection is carried out on the welded joint after the welding of the embodiment of the invention, and the result is as follows: the surface of the welding line is free of defects, and the 2X requirement of GB/T26952 and 2011 is met; ultrasonic detection is carried out on the welded joint, and the result is as follows: the interior of the welding line has no defects, and meets the 2-level requirements of GB/T29712-2013.
The mechanical property of the welding joint is detected, and the detection result of the tensile strength of the welding joint, the detection result of the bending test of the welding joint and the detection result of the impact toughness of the welding joint are respectively shown in the following tables:
nondestructive testing and mechanical property testing are carried out, and the result is as follows: magnetic powder detection is carried out on the welding joint, the surface of the welding joint is free of defects, and the 2X requirement of GB/T26952 and 2011 is met; ultrasonic detection is carried out on the welding joint, the interior of the welding joint is free of defects, and the requirement of GB/T29712 and 2013 on level 2 is met. Wherein, the welded joint tensile strength testing result, the welded joint bending test testing result, and the welded joint impact toughness testing result are respectively as follows:
tensile strength detection result of welded joint
Test result of welding joint bending test
Test result of impact toughness of welded joint
In the above table, WM indicates the weld center position, FL indicates the weld line position, FL +2 indicates the heat affected zone position 2mm from the weld line, and FL +5 indicates the heat affected zone position 5mm from the weld line; the face was 2mm from the surface of the sample.
From the above tables, it can be seen that the mechanical properties of the welding joint after the Q420 high-strength steel thick plate is subjected to the preheating-free twin-wire submerged arc welding meet the standard requirements of GB/T19869.1-2005 'test for evaluating welding process of steel, nickel and nickel alloy', and the evaluation of the welding process is approved by supervision engineers.
In conclusion, the invention strictly performs steel assembly and tack welding, adjusts the proper angle and the proper distance of the welding gun, selects the proper welding material and matches with the proper welding process parameters to complete the welding of the Q420 high-strength steel through the design of the welding joint, and can reduce the number of welding passes and improve the welding efficiency without preheating and postweld heat treatment under the condition of ensuring the welding quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A Q420 high strength steel thick plate non-preheating twin-wire submerged arc welding process is characterized by comprising the following steps:
step 1, processing an X-shaped welding groove at a welding position where a welding plate is a Q420 high-strength steel thick plate, wherein corresponding parameters of the X-shaped welding groove are as follows: the angle of the front groove is 55-65 degrees, the angle of the back groove is 65-75 degrees, the depth of the back groove is 1/3 of the plate thickness, the truncated edge is 9-11 mm, and the root gap is 0-1 mm; after the machining is finished, cleaning an oxide layer of the X-shaped welding bevel face and impurities within the range of 20-30mm around the X-shaped welding bevel;
step 2, welding a positioning welding seam at the X-shaped welding slope through semi-automatic CO2 gas shielded welding, wherein: the thickness of the positioning welding line is 4-5mm, the length of the positioning welding line is 50-60mm, and the welding line interval is 400-500 mm;
step 3, respectively installing an arc striking plate and an arc extinguishing plate at two ends of the X-shaped welding groove, wherein the material, the thickness and the groove parameters of the arc striking plate and the arc extinguishing plate are the same as those of the welding plate;
step 4, centering the front welding wire and the rear welding wire to weld the center of the groove, and adjusting the angle and the distance of a welding gun to enable the front wire electrode to tilt forwards by 0 degrees, wherein the distance from a front wire conductive nozzle to a workpiece is 35 mm; the back wire electrode is inclined backwards by 17-23 degrees, and the distance from the back wire conductive nozzle to the workpiece is 40 mm; the distance between the front wire electrode and the rear wire electrode is 30-35 mm;
step 5, welding a front welding seam, and filling a back welding seam after the front groove is welded; wherein, the welding parameters are as follows:
when the front surface is subjected to backing weld bead welding, the front wire welding current is 650-670A, the front wire welding voltage is 32-34V, and the front wire welding speed is 65-70 cm/min; the welding current of the rear wire is 600-620A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 65-70 cm/min;
when the front surface is filled and the cover surface is welded by the welding way, the welding current of the front wire is 670-; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 37-39V, and the welding speed of the rear wire is 65-70 cm/min;
when the back bottoming bead is welded, the front wire welding current is 950-970A, the front wire welding voltage is 32-34V, and the front wire welding speed is 62-68 cm/min; the welding current of the rear wire is 620-640A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 62-68 cm/min;
when the back filling weld bead is welded, the welding current of the front wire is 650-670A, the welding voltage of the front wire is 32-34V, and the welding speed of the front wire is 70-75 cm/min; the welding current of the rear wire is 560-580A, the welding voltage of the rear wire is 36-38V, and the welding speed of the rear wire is 70-75 cm/min;
when the back cover surface is welded, the welding current of the front wire is 640-660A, the welding voltage of the front wire is 31-33V, and the welding speed of the front wire is 65-70 cm/min; the welding current of the rear wire is 550-570A, the welding voltage of the rear wire is 34-36V, and the welding speed of the rear wire is 65-70 cm/min;
and 6, cutting off arc striking plates and arc extinguishing plates at two ends of the welding line after the welding line is cooled.
2. The Q420 high strength steel thick plate non-preheating twin-wire submerged arc welding process of claim 1, wherein in step 4, the rear wire electrode is tilted back by 20 degrees; the distance between the front wire electrode and the rear wire electrode is 35 mm; the length of the welding wire extending out of the contact tip is 35-45 mm.
3. The non-preheating double-wire submerged arc welding process for the Q420 high-strength steel thick plate according to claim 1, wherein in the step 5, the adopted welding wire meets the specified requirement of the H08MnMoA model in GB/T12470 during welding.
4. The Q420 high-strength steel thick plate non-preheating twin-wire submerged arc welding process of claim 1, wherein in step 5, welding is performed by using double power supplies and double electrodes, wherein the front wire is welded by using a direct current power supply, and the rear wire is welded by using an alternating current power supply.
5. The Q420 high-strength steel thick plate non-preheating twin-wire submerged arc welding process of claim 1, wherein in the step 5, before welding the back weld, the root of the groove is cleaned by a carbon arc gouging combined with mechanical grinding, and the root is not welded through, not fused and the slag defects are removed.
6. The non-preheating twin-wire submerged arc welding process for the Q420 high-strength steel thick plate as claimed in claim 1, wherein the inter-pass temperature is 100-230 ℃ during welding, and the weld bead joints are required to be staggered by 50mm during welding.
7. The non-preheating twin-wire submerged arc welding process for the thick Q420 high-strength steel plate as claimed in claim 1, wherein in the step 2 and the step 3, the flux-cored wire is used in the welding process, and the type of the flux-cored wire is GB/T17493-.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111438424A (en) * | 2020-04-03 | 2020-07-24 | 燕山大学 | Arc striking device and process for longitudinal submerged arc welded pipe |
| CN111761176A (en) * | 2020-07-01 | 2020-10-13 | 广州文冲船厂有限责任公司 | Fixed-position T-shaped full penetration joint welding process |
| CN111906417A (en) * | 2020-07-28 | 2020-11-10 | 上海建工（江苏）钢结构有限公司 | Non-groove welding process method for submerged-arc welding of medium plate joint |
| CN112247322A (en) * | 2020-12-07 | 2021-01-22 | 郑州宝冶钢结构有限公司 | Double-wire straight angle automatic submerged-arc welding process method |
| CN113579431A (en) * | 2021-08-30 | 2021-11-02 | 广船国际有限公司 | Medium plate monofilament submerged arc welding method |
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| CN114289837A (en) * | 2022-01-11 | 2022-04-08 | 河北科技大学 | Dynamic welding method and dynamic welding parameter adjusting system for thick plate three-wire submerged arc welding |
| CN114346382A (en) * | 2021-12-13 | 2022-04-15 | 上海江南长兴造船有限责任公司 | Single-wire and double-wire combined submerged arc automatic welding method |
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| CN111421208A (en) * | 2020-03-16 | 2020-07-17 | 程业品 | Submerged-arc welding method for steel plate |
| CN111421208B (en) * | 2020-03-16 | 2021-11-12 | 济南市钢宝科贸有限公司 | Submerged-arc welding method for steel plate |
| CN111438424A (en) * | 2020-04-03 | 2020-07-24 | 燕山大学 | Arc striking device and process for longitudinal submerged arc welded pipe |
| CN111438424B (en) * | 2020-04-03 | 2021-02-26 | 燕山大学 | Arc striking device and process for longitudinal submerged arc welded pipe |
| CN111761176A (en) * | 2020-07-01 | 2020-10-13 | 广州文冲船厂有限责任公司 | Fixed-position T-shaped full penetration joint welding process |
| CN111906417A (en) * | 2020-07-28 | 2020-11-10 | 上海建工（江苏）钢结构有限公司 | Non-groove welding process method for submerged-arc welding of medium plate joint |
| CN112247322A (en) * | 2020-12-07 | 2021-01-22 | 郑州宝冶钢结构有限公司 | Double-wire straight angle automatic submerged-arc welding process method |
| CN114762907A (en) * | 2021-01-13 | 2022-07-19 | 宝山钢铁股份有限公司 | Thick-wall high-strength steel double-sided submerged arc welding method for dynamic load occasions |
| CN113579431A (en) * | 2021-08-30 | 2021-11-02 | 广船国际有限公司 | Medium plate monofilament submerged arc welding method |
| CN113664343A (en) * | 2021-09-02 | 2021-11-19 | 内蒙古第一机械集团股份有限公司 | Double-wire welding method for armor material GY4 |
| CN114346382A (en) * | 2021-12-13 | 2022-04-15 | 上海江南长兴造船有限责任公司 | Single-wire and double-wire combined submerged arc automatic welding method |
| CN114289837A (en) * | 2022-01-11 | 2022-04-08 | 河北科技大学 | Dynamic welding method and dynamic welding parameter adjusting system for thick plate three-wire submerged arc welding |
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