CN111545877A - Welding method of carbon structural steel - Google Patents
Welding method of carbon structural steel Download PDFInfo
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- CN111545877A CN111545877A CN202010417841.8A CN202010417841A CN111545877A CN 111545877 A CN111545877 A CN 111545877A CN 202010417841 A CN202010417841 A CN 202010417841A CN 111545877 A CN111545877 A CN 111545877A
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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
-
- 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
-
- 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
-
- 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
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention provides a welding method of carbon structural steel, which comprises the following steps: selecting welding materials: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 welding flux; preparing before welding: the weldment adopts a double-sided V-shaped groove, the angle of the groove is 65-75 degrees, and the groove, the butt joint surface, the welding part and the surface of a welding wire are cleaned; welding an arc striking plate and an extraction plate on two ends of the weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are arranged on the front and back surfaces of the arc striking plate and the extraction plate; the thickness of a weldment is 16-22 m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 800-950A, the arc voltage is 33-38V, and the welding speed is 32-38 m/h; after welding, removing roots by using a carbon arc gouging tool, and then carrying out submerged-arc welding on the reverse side, wherein the welding current of the reverse side submerged-arc welding is 850-1050A, the arc voltage is 36-40V, and the welding speed is 23-26 m/h; and removing the arc striking plate and the lead-out plate after welding. The invention has beautiful welding line formation and improves the welding quality and the production efficiency.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a welding method of carbon structural steel.
Background
Q235 is common carbon structural steel, the yield strength of which is about 235MPa, and the yield value is reduced along with the increase of the thickness of the material. Because the carbon content of the Q235 steel is moderate, the comprehensive performance is better, the performances such as strength, plasticity, welding and the like are better matched, the application is most extensive, and the Q235 steel is widely applied to buildings and engineering structures and some mechanical parts with low performance requirements. However, in the existing welding technology of Q235, such as electroslag welding, the problems of unattractive formed welding seam, poor welding quality and low production efficiency are easily caused due to large current and linear energy.
Disclosure of Invention
Aiming at the technical problems, the invention provides a welding method of carbon structural steel, which aims at the Q235 base metal with the weldment thickness of 16-22 m, the welding process is controlled, the welding seam is attractive in shape, and the welding quality and the production efficiency are improved.
The technical scheme of the invention is as follows: a welding method of carbon structural steel comprises the following steps:
step S1, solder material selection: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 welding flux;
step S2, preparation before welding: the welding piece adopts a double-sided V-shaped groove, the angle of the groove is 65-75 degrees, the surface rust, oil stain, oxide skin, moisture and other impurities of the groove, the butt joint surface and the welding part are removed, and the rust spot, the oil stain and other impurities on the surface of the welding wire are removed;
step S3, welding: welding an arc striking plate and an extraction plate on two ends of a weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are arranged on the front and back surfaces of the arc striking plate and the extraction plate, and the arc striking plate and the extraction plate prevent metal of a molten pool at an arc closing position from losing or leaving arc pits;
the thickness of a weldment is 16-22 m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 800-950A, the arc voltage is 33-38V, and the welding speed is 32-38 m/h;
and (3) after welding, removing roots by using a carbon arc gouging, and then carrying out submerged-arc welding on the reverse side, wherein the welding current of the reverse side submerged-arc welding is 850-1050A, the arc voltage is 36-40V, and the welding speed is 23-26 m/h.
Step S4, post-weld processing: and after welding, removing the arc striking plates and the lead-out plates at the two ends of the weldment.
In the scheme, the HJ431 flux is dried for 1.5 hours at 260 ℃ before welding in the step S1, so that the condition of serious arc flash and large spark during welding can be well reduced, and the welding quality is improved.
In the scheme, in the step S3, the thickness of the weldment is 16m, the diameter of the welding wire is 5mm, the welding current of front submerged arc welding is 800A, the arc voltage is 33V, and the welding speed is 38 m/h;
the welding current of the reverse submerged arc welding is 850A, the arc voltage is 36V, and the welding speed is 26 m/h.
In the scheme, in the step S3, the thickness of the weldment is 18m, the diameter of the welding wire is 5mm, the welding current of front submerged arc welding is 850A, the arc voltage is 37V, and the welding speed is 35 m/h;
the welding current of the reverse submerged arc welding is 930A, the arc voltage is 39V, and the welding speed is 24 m/h.
In the scheme, in the step S3, the thickness of the weldment is 22m, the diameter of the welding wire is 5mm, the welding current of front submerged arc welding is 900A, the arc voltage is 38V, and the welding speed is 32 m/h;
the welding current of the reverse submerged arc welding is 1050A, the arc voltage is 40V, and the welding speed is 23 m/h.
In the scheme, the carbon arc gouging process comprises the following steps: the diameter of the carbon rod is 6mm, the planing current is 285-295A, and the pressure of compressed air is 0.45-0.55 MPa.
In the above scheme, after welding in step S4 is finished, the arc runner and the end plate are removed by gas cutting, and then are polished flat by using a grinding wheel to prevent cracks from being generated at the end of the weld joint.
Compared with the prior art, the invention has the beneficial effects that: the invention aims at Q235 base metal with the thickness of 16-22 m of a weldment, and adopts a double-sided V-shaped groove to weld an arc striking plate and an extraction plate on two ends of the weldment respectively by controlling a welding process, so that the metal loss of a molten pool at an arc closing position or the remaining of an arc pit is prevented, manual arc welding is firstly used for backing welding on the reverse side during welding, then submerged arc welding is carried out on the front side, carbon arc gouging is used for back gouging after welding, then submerged arc welding on the reverse side is carried out, and the arc striking plate and the extraction plate are respectively welded on two ends of the weldment after the welding is finished and removed.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are illustrative and are not to be construed as limiting the invention.
Example 1
A welding method of carbon structural steel comprises the following steps:
step S1, solder material selection: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 flux, and the HJ431 flux is dried for 1.5 hours at 260 ℃ before the welding;
step S2, preparation before welding: the welding piece adopts a double-sided V-shaped groove, the angle of the groove is 65 degrees, the surface rust, oil stain, oxide skin, moisture and other impurities of the groove, the butt joint surface and the welding part are removed, and the rust spot, the oil stain and other impurities on the surface of the welding wire are removed;
step S3, welding: welding an arc striking plate and an extraction plate on two ends of a weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are formed in the front and back surfaces of the arc striking plate and the extraction plate;
the thickness of a weldment is 16m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 800A, the arc voltage is 33V, and the welding speed is 38 m/h;
and (3) after welding, back chipping by using a carbon arc gouging, wherein the carbon arc gouging process comprises the following steps: the diameter of the carbon rod is 6mm, the planing current is 285A, and the pressure of compressed air is 0.45 MPa;
then carrying out reverse submerged-arc welding, wherein the welding current of the reverse submerged-arc welding is 850A, the arc voltage is 36V, and the welding speed is 26 m/h;
step S4, post-weld processing: and removing the arc striking plates and the lead-out plates at the two ends of the weldment by gas cutting, and then polishing and flattening by using a grinding wheel to prevent cracks from being generated at the end part of the welding line.
Example 2
Step S1, solder material selection: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 flux, and the HJ431 flux is dried for 1.5 hours at 260 ℃ before the welding;
step S2, preparation before welding: the welding piece adopts a double-sided V-shaped groove, the angle of the groove is 70 degrees, the surface rust, oil stain, oxide skin, moisture and other impurities of the groove, the butt joint surface and the welding part are removed, and the rust spot, the oil stain and other impurities on the surface of the welding wire are removed;
step S3, welding: welding an arc striking plate and an extraction plate on two ends of a weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are formed in the front and back surfaces of the arc striking plate and the extraction plate;
the thickness of a weldment is 18m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 850A, the arc voltage is 37V, and the welding speed is 35 m/h;
and (3) after welding, back chipping by using a carbon arc gouging, wherein the carbon arc gouging process comprises the following steps: the diameter of the carbon rod is 6mm, the planing current is 290A, and the pressure of compressed air is 0.50 MPa;
then carrying out reverse submerged-arc welding, wherein the welding current of the reverse submerged-arc welding is 930A, the arc voltage is 39V, and the welding speed is 24 m/h;
step S4, post-weld processing: and removing the arc striking plates and the lead-out plates at the two ends of the weldment by gas cutting, and then polishing and flattening by using a grinding wheel to prevent cracks from being generated at the end part of the welding line.
Example 3
Step S1, solder material selection: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 flux, and the HJ431 flux is dried for 1.5 hours at 260 ℃ before the welding;
step S2, preparation before welding: the welding piece adopts a double-sided V-shaped groove, the angle of the groove is 65 degrees, the surface rust, oil stain, oxide skin, moisture and other impurities of the groove, the butt joint surface and the welding part are removed, and the rust spot, the oil stain and other impurities on the surface of the welding wire are removed;
step S3, welding: welding an arc striking plate and an extraction plate on two ends of a weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are formed in the front and back surfaces of the arc striking plate and the extraction plate;
the thickness of a weldment is 22m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 900A, the arc voltage is 38V, and the welding speed is 32 m/h;
and (3) after welding, back chipping by using a carbon arc gouging, wherein the carbon arc gouging process comprises the following steps: the diameter of the carbon rod is 6mm, the planing current is 295A, and the pressure of compressed air is 0.55 MPa;
then carrying out reverse submerged-arc welding, wherein the welding current of the reverse submerged-arc welding is 1050A, the arc voltage is 40V, and the welding speed is 23 m/h;
step S4, post-weld processing: and removing the arc striking plates and the lead-out plates at the two ends of the weldment by gas cutting, and then polishing and flattening by using a grinding wheel to prevent cracks from being generated at the end part of the welding line.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (7)
1. A welding method of carbon structural steel is characterized by comprising the following steps:
step S1, solder material selection: the weldment adopts a Q235 base metal, a copper-plated welding wire H08A and HJ431 welding flux;
step S2, preparation before welding: the welding piece adopts a double-sided V-shaped groove, the angle of the groove is 65-75 degrees, the surface rust, oil stain, oxide skin, moisture and other impurities of the groove, the butt joint surface and the welding part are removed, and the rust spot, the oil stain and other impurities on the surface of the welding wire are removed;
step S3, welding: welding an arc striking plate and an extraction plate on two ends of a weldment respectively, wherein double-sided V-shaped grooves identical to those of the weldment are formed in the front and back surfaces of the arc striking plate and the extraction plate;
the thickness of a weldment is 16-22 m, the diameter of a welding wire is 5mm, backing welding is carried out on the reverse side by manual arc welding during welding, then submerged-arc welding is carried out on the front side, the welding current of the front side submerged-arc welding is 800-950A, the arc voltage is 33-38V, and the welding speed is 32-38 m/h;
and (3) after welding, removing roots by using a carbon arc gouging, and then carrying out submerged-arc welding on the reverse side, wherein the welding current of the reverse side submerged-arc welding is 850-1050A, the arc voltage is 36-40V, and the welding speed is 23-26 m/h.
Step S4, post-weld processing: and after welding, removing the arc striking plates and the lead-out plates at the two ends of the weldment.
2. The method for welding carbon structural steel as claimed in claim 1, wherein the HJ431 flux is dried at 260 ℃ for 1.5 hours before the start of welding in step S1.
3. The welding method of carbon structural steel as claimed in claim 1, wherein the thickness of the weldment at step S3 is 16m, the diameter of the wire is 5mm, the welding current for the front submerged arc welding is 800A, the arc voltage is 33V, and the welding speed is 38 m/h;
the welding current of the reverse submerged arc welding is 850A, the arc voltage is 36V, and the welding speed is 26 m/h.
4. The welding method of carbon structural steel as claimed in claim 1, wherein the thickness of the weldment at step S3 is 18m, the diameter of the wire is 5mm, the welding current for the front submerged arc welding is 850A, the arc voltage is 37V, and the welding speed is 35 m/h;
the welding current of the reverse submerged arc welding is 930A, the arc voltage is 39V, and the welding speed is 24 m/h.
5. The welding method of carbon structural steel as claimed in claim 1, wherein the thickness of the weldment at step S3 is 22m, the diameter of the wire is 5mm, the welding current for the front submerged arc welding is 900A, the arc voltage is 38V, and the welding speed is 32 m/h;
the welding current of the reverse submerged arc welding is 1050A, the arc voltage is 40V, and the welding speed is 23 m/h.
6. The method for welding carbon structural steel as claimed in claim 1, wherein the carbon arc gouging process comprises: the diameter of the carbon rod is 6mm, the planing current is 285-295A, and the pressure of compressed air is 0.45-0.55 MPa.
7. The method for welding carbon structural steel as claimed in claim 1, wherein the arc runner and the end tab are removed by gas cutting in step S4.
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| CN202010417841.8A CN111545877A (en) | 2020-05-18 | 2020-05-18 | Welding method of carbon structural steel |
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| CN202010417841.8A CN111545877A (en) | 2020-05-18 | 2020-05-18 | Welding method of carbon structural steel |
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| CN105983753A (en) * | 2015-01-30 | 2016-10-05 | 重庆文力机械有限公司 | Ordinary carbon structural steel welding process |
| CN108788507A (en) * | 2018-07-12 | 2018-11-13 | 福建省马尾造船股份有限公司 | A kind of divided edge structure and welding procedure of steel plate welding |
| CN109967842A (en) * | 2019-05-17 | 2019-07-05 | 广州黄船海洋工程有限公司 | A kind of EH36 high strength steel slab does not preheat submerged arc soldering method |
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2020
- 2020-05-18 CN CN202010417841.8A patent/CN111545877A/en active Pending
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| KR20090002795A (en) * | 2007-07-04 | 2009-01-09 | 삼협기공 주식회사 | The welding method of lng tank |
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| CN105983753A (en) * | 2015-01-30 | 2016-10-05 | 重庆文力机械有限公司 | Ordinary carbon structural steel welding process |
| CN108788507A (en) * | 2018-07-12 | 2018-11-13 | 福建省马尾造船股份有限公司 | A kind of divided edge structure and welding procedure of steel plate welding |
| CN109967842A (en) * | 2019-05-17 | 2019-07-05 | 广州黄船海洋工程有限公司 | A kind of EH36 high strength steel slab does not preheat submerged arc soldering method |
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