CN113814524A - Low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method - Google Patents
Low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method Download PDFInfo
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- CN113814524A CN113814524A CN202111168162.2A CN202111168162A CN113814524A CN 113814524 A CN113814524 A CN 113814524A CN 202111168162 A CN202111168162 A CN 202111168162A CN 113814524 A CN113814524 A CN 113814524A
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- 238000003466 welding Methods 0.000 title claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 21
- 239000000956 alloy Substances 0.000 title claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 19
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 239000011324 bead Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000007781 pre-processing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 7
- 238000007689 inspection Methods 0.000 abstract description 2
- 230000007704 transition Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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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
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The invention provides a method for welding a low-carbon medium-alloy quenched and tempered high-strength steel without swinging of a vertical fillet, which comprises the following steps of: step one, preprocessing a welding groove; assembling a workpiece to be welded and performing tack welding, wherein the tack welding of the single-side welding is positioned on the reverse side of the welding seam; welding a workpiece, namely welding a welding seam by adopting a single-pulse and direct-current combined current wave, wherein the welding direction is from bottom to top, the pulse peak current of the single-pulse current wave is from +15A to +25A, the pulse base value current is from +40 to +45A, the pulse voltage is from-1V to +1V, the direct-current voltage is from-1V to +1V, and the pulse duty ratio is 20-25%; and step four, after welding is finished, cleaning the surface of the welding bead by adopting an electric grinding wheel and a steel wire brush. The appearance inspection of the low-carbon medium-alloy quenched and tempered high-strength steel sheet welded by the method of the invention on the vertical upper corner welding plate without swinging shows that the weld joint is good in forming, surface welding defects are not found, and the welding deformation is small.
Description
Technical Field
The invention relates to the technical field of hull welding, in particular to a low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method.
Background
The carbon equivalent of the low-carbon medium alloy quenched and tempered high-strength steel is about 0.764, and according to a Graville weldability evaluation chart, when the carbon equivalent exceeds 0.6%, the weldability is poor, a welding heat affected zone has an obvious hardening tendency, and the welding difficulty is high. The current common direct current MAG welding process is mainly in the form of droplet transition, namely jet flow transition during high current and short circuit transition during low current. When the current is high, the defects such as welding beading and the like are caused, and welding seams form a braid shape and a twist shape; when the current is low, the welding has the defects of large splashing amount, poor forming, easy slag inclusion and the like, particularly, teammates have some active metals which cannot be welded under the low current, the requirement on the skill of a welder is extremely high, under the objective condition of poor weldability, arc operation gestures of the welder are required, the welder swings left and right, and the quality is difficult to control. For example, the arc of the arc is not uniform, the arc is deflected to one side, and the size of the welding leg is not uniform.
The currently used common direct-current MAG welding process has the advantages of low welding quality qualification rate, large polishing workload, long time consumption, low efficiency and serious environmental pollution.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for welding low-carbon medium-alloy quenched and tempered high-strength steel without swinging fillet welding, which is used for solving the problems of poor welding quality and uneven welding leg of the low-carbon medium-alloy quenched and tempered high-strength steel in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a method for low-carbon medium-alloy quenched and tempered high-strength steel non-swing fillet welding, comprising the steps of:
step one, preprocessing a welding groove;
assembling a workpiece to be welded and performing tack welding, wherein the tack welding of the single-side welding is positioned on the reverse side of the welding seam;
welding a workpiece, namely welding a welding seam by adopting a single-pulse and direct-current combined current wave, wherein the welding direction is from bottom to top, the pulse peak current of the single-pulse current wave is from +15A to +25A, the pulse base value current is from +40 to +45A, the pulse voltage is from-1V to +1V, the direct-current voltage is from-1V to +1V, and the pulse duty ratio is 20-25%;
and step four, after welding is finished, cleaning the surface of the welding bead by adopting an electric grinding wheel and a steel wire brush.
As a preferable technical scheme, in the first step, rust, oil stains and water in the range of 30mm on two sides of the groove are removed.
Preferably, in the second step, the workpiece gap is 0-1 mm.
In the third step, a MIG/MAG welding machine is adopted as a welding power source, a solid welding wire is adopted as a welding material, the welding protective gas is 80% Ar + 20% CO2 mixed gas, the gas flow rate is 18-25L/min, the dry elongation of the welding wire is 18-20mm, the wire feeding speed is 15-20m/min, and the welding position is in the vertical direction.
Preferably, in the third step, the angle α between the welding gun and the steel plate is 45 ± 3 degrees, and the angle β between the welding gun and the weld is 70-80 °.
As a preferable technical scheme, in the third step, the thickness of the welding leg is 3-5 mm.
Preferably, the thickness of the workpiece is less than 10 mm.
The method has simple operation, convenient use and low requirement on the skill level of welding workers, and the single pulse and direct current combined waveform is adopted, so that the molten drop transition form is that one molten drop is in pulse transition, and the number of the molten drop transition drops in unit time, namely the melting speed of the welding wire can be changed by adjusting the pulse frequency; due to the one-pulse droplet shot transition, the droplet diameter is approximately equal to the wire diameter, and the droplet arc heat is low, i.e. the droplet temperature is low (compared to the jet transition and the large droplet transition). The melting coefficient of the welding wire, that is, the melting efficiency of the welding wire is improved. Compared with the common direct current MAG welding, the invention has little welding spatter, even no spatter; the electric arc has good directivity, good weld formation, larger fusion width and small residual height. Because the temperature of the molten drops is low, the welding smoke is less, and the construction environment is improved.
The appearance inspection of the low-carbon medium-alloy quenched and tempered high-strength steel sheet welded by the method of the invention on the vertical upper corner welding plate without swinging shows that the weld joint is good in forming, no surface welding defect is found, the welding deformation is small, no air hole exists on the surface of the sheet through coloring detection, no welding defects such as root incomplete penetration, air hole, incomplete fusion and the like are detected through ultrasonic detection, and the mechanical properties (macro and hardness) of the test plate meet the standard requirements.
Drawings
FIG. 1 shows a flow chart of the method of the present invention.
FIG. 2 is a schematic view of a welding groove of the present invention.
FIG. 3 is a schematic view of the angle between the welding torch and the steel plate according to the present invention.
FIG. 4 is a schematic view of the angle between the welding torch and the weld according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to fig. 1 to 4. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The embodiment provides a method for swing-free vertical fillet welding of low-carbon medium-alloy tempered high-strength steel, wherein a pulse MIG/MAG welding machine is adopted as a welding power source, a solid welding wire is adopted as a welding material, 80% Ar + 20% CO2 mixed gas is adopted as protective gas, and a single pulse + direct current combined waveform is adopted to realize swing-free vertical upward welding of the low-carbon medium-alloy tempered high-strength steel. The weld joint is well formed, a large amount of polishing working time is saved, and the construction environment is improved.
In the present example, the welding method of the present invention will be specifically described with respect to a low-carbon medium-alloy heat-treated high-strength steel having a thickness of 5mm without vertically swinging. The invention comprises the following steps:
step 1: and preprocessing the welding groove.
And machining the welding groove by adopting a mechanical method to ensure that the surface of the groove is smooth, and polishing metal burrs at the edge of the groove by using a grinding wheel. And (4) removing the primer on the surface workshop in the welding area of the bottom plate by using a grinding wheel until the original metal luster of the steel plate is exposed. Before welding, flame is used for drying the moisture on the surface of the test board.
Step 2: and (6) assembling, positioning and welding.
The assembly gap is 0-1 mm. In this embodiment, the assembly gap is 0mm, the tack weld should be welded to the back of the formed weld bead, and the tack weld surface is polished smooth by using a grinding wheel.
And step 3: and performing formal welding operation.
In the embodiment, the pulse current waveform is adjusted to pulse peak current +20A, pulse base current +45A, pulse voltage 0V and direct current voltage 0V, the pulse and direct current duty ratio is 22%, the dry elongation of the welding wire is 18-20mm, the wire feeding speed is 15-20m/min, a welding gun is aligned to the center of a welding seam, the alpha angle between the welding gun and a steel plate is about 45 degrees, the beta angle with the welding seam is about 75 degrees, the gas flow rate is controlled to be 18-25L/min, and then the welding is started.
And 4, step 4: and after welding is finished, cleaning the surface of the welding bead by adopting an electric grinding wheel and a steel wire brush.
The test plate welded by the method of the invention is detected to be colored, and no air holes are found on the surface of the test plate. Performing a macroscopic corrosion test according to CB/T3380-2013, and finding welding defects such as cracks, air holes, unfused and the like in welding seams, boundaries and heat affected zones; hardness test is carried out according to GB/T2654-2008, and the test results are shown in the following table:
the foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method is characterized by comprising the following steps of:
step one, preprocessing a welding groove;
assembling a workpiece to be welded and performing tack welding, wherein the tack welding of the single-side welding is positioned on the reverse side of the welding seam;
welding a workpiece, namely welding a welding seam by adopting a single-pulse and direct-current combined current wave, wherein the welding direction is from bottom to top, the pulse peak current of the single-pulse current wave is from +15A to +25A, the pulse base value current is from +40 to +45A, the pulse voltage is from-1V to +1V, the direct-current voltage is from-1V to +1V, and the pulse duty ratio is 20-25%;
and step four, after welding is finished, cleaning the surface of the welding bead by adopting an electric grinding wheel and a steel wire brush.
2. The method for the swing-free vertical fillet welding of the low-carbon medium-alloy quenched and tempered high-strength steel as recited in claim 1, wherein rust, oil stains and water are removed within 30mm of the two sides of the groove in the first step.
3. The method for fillet welding the low-carbon medium-alloy quenched and tempered high-strength steel without swinging of the fillet welding in the second step is characterized in that the clearance of the workpiece is 0-1 mm.
4. The method for low-carbon medium-alloy quenched and tempered high-strength steel swing-free vertical fillet welding according to claim 1, wherein in the third step, a MIG/MAG welding machine is adopted as a welding power source, a solid welding wire is adopted as a welding material, 80% Ar + 20% CO2 mixed gas is adopted as a welding protective gas, the gas flow rate is 18-25L/min, the dry elongation of the welding wire is 18-20mm, the wire feeding speed is 15-20m/min, and the welding position is in the vertical direction.
5. The method for low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding according to claim 1, wherein in the third step, the angle α between a welding gun and a steel plate is 45 ± 3 degrees, and the angle β between the welding gun and a welding seam is 70-80 degrees.
6. The method for fillet welding of the low-carbon medium-alloy quenched and tempered high-strength steel without swinging of the fillet welding in the third step is characterized in that the thickness of the welding leg is 3-5 mm.
7. The method of claim 1, wherein the thickness of the workpiece is less than 10 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111168162.2A CN113814524A (en) | 2021-09-30 | 2021-09-30 | Low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111168162.2A CN113814524A (en) | 2021-09-30 | 2021-09-30 | Low-carbon medium-alloy quenched and tempered high-strength steel non-swing vertical fillet welding method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999037A (en) * | 2007-01-11 | 2007-07-18 | 上海交通大学 | Control method of digital pulse consumable electrode gas protection welding |
| JP2009045670A (en) * | 2007-07-23 | 2009-03-05 | Daihen Corp | Pulse arc welding method |
| CN106891081A (en) * | 2017-04-28 | 2017-06-27 | 广船国际有限公司 | A kind of vertical corner connection double-wire automatic welding connects method |
| CN109382569A (en) * | 2017-08-02 | 2019-02-26 | 浙江颐顿机电有限公司 | A kind of pulse MIC welding welding system |
| CN111230264A (en) * | 2020-01-19 | 2020-06-05 | 武汉一冶钢结构有限责任公司 | Welding method of MIG welding of 304L austenitic stainless steel |
-
2021
- 2021-09-30 CN CN202111168162.2A patent/CN113814524A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100999037A (en) * | 2007-01-11 | 2007-07-18 | 上海交通大学 | Control method of digital pulse consumable electrode gas protection welding |
| JP2009045670A (en) * | 2007-07-23 | 2009-03-05 | Daihen Corp | Pulse arc welding method |
| CN106891081A (en) * | 2017-04-28 | 2017-06-27 | 广船国际有限公司 | A kind of vertical corner connection double-wire automatic welding connects method |
| CN109382569A (en) * | 2017-08-02 | 2019-02-26 | 浙江颐顿机电有限公司 | A kind of pulse MIC welding welding system |
| CN111230264A (en) * | 2020-01-19 | 2020-06-05 | 武汉一冶钢结构有限责任公司 | Welding method of MIG welding of 304L austenitic stainless steel |
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Application publication date: 20211221 |