CN115555719A - Laser welding method for continuous pickling of 65Mn high-carbon steel - Google Patents
Laser welding method for continuous pickling of 65Mn high-carbon steel Download PDFInfo
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- CN115555719A CN115555719A CN202211172594.5A CN202211172594A CN115555719A CN 115555719 A CN115555719 A CN 115555719A CN 202211172594 A CN202211172594 A CN 202211172594A CN 115555719 A CN115555719 A CN 115555719A
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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Abstract
A high-carbon steel 65Mn continuous acid pickling laser welding method comprises the following steps: shearing and aligning the hot rolled plate and then carrying out butt welding; carrying out low-power laser heating; carrying out continuous acid washing conventionally; heating a casting blank; rolling to the thickness of a product; carrying out laminar cooling by adopting a back-end cooling mode; coiling; and (4) performing off-line heat treatment. According to the invention, when welding is carried out for one time, the local part of a welding line is heated and melted, and then quenching is carried out after cooling, so that a martensite structure is generated; then, laser heating the welding seam, and annealing treatment is carried out, so that the martensite structure is generated into tempered martensite, and the plasticity of the welding seam is improved; and no additional equipment is needed, so that the investment is reduced; the cup bulge and the cold bending are detected to be qualified, the implementation is simple, and the requirement of pickling through plates is met.
Description
Technical Field
The invention relates to a welding method, in particular to a laser welding method for continuous pickling of 65Mn high-carbon steel.
Background
The thin 65Mn pickled plate with the thickness less than 2mm can be used for processing tools and parts, realizes the replacement of cold by acid, or is used for producing a cold-rolled plate with a thinner specification, reduces the rolling process of cold rolling, and is an important industrial raw material. The main difficulty in producing the thin 65Mn pickled plate lies in the welding of continuous pickling, and as the carbon equivalent of 65Mn welding reaches 0.83, the hardenability of a welding seam is high, a quenched martensite structure is easy to appear after welding, the welding seam is hard and brittle, and cracks are easy to generate. In order to realize the continuous pickling of 65Mn, the quality problem of the welding seam needs to be solved, and the welding seam quality is generally optimized by adopting the processes of preheating, wire filling, spark welding, annealing and the like. However, these processes all require new equipment, are not necessarily required in the production of low-carbon steel, involve a large number of processes, and the development of matching processes is not mature.
After retrieval: chinese patent publication No. CN105149810 discloses "a welding method for preventing high carbon equivalent strip steel weld breakage", wherein the weld between the strip steels is welded by laser welding, and the components of the welding wire adopted by the laser welding are: 0.08 to 0.09 percent of C, 0.7 to 0.88 percent of Si, 1.3 to 1.47 percent of Mn, less than or equal to 0.011 percent of P, less than or equal to 0.008 percent of S, 0.11 to 0.14 percent of Cu0.004 to 0.007 percent of Ni, 0.040 to 0.046 percent of Cr and the balance of Fe; the power of the adopted welding machine is 9000-11000W, the welding speed of the welding machine is 2-6 m/min, the wire feeding speed is 2-7 m/min, the annealing current is 100-160A, and the annealing temperature is 500-900 ℃. The laser welding method for preventing the high-carbon-equivalent strip steel from being broken provided by the invention solves the technical problem that the welding seam of the high-carbon-equivalent strip steel with the carbon equivalent of more than 0.5% is easy to break. The method is used for welding the low-carbon high-manganese steel, the welding machine is required to be provided with the annealing device, and the annealing device and the welding device are in follow-up motion, so that the annealing current is required to be large, and the failure rate of the annealing device is high.
The Chinese patent publication No. CN105904092 discloses a laser welding method and a device for medium-high carbon steel plates, which comprises the following steps: 1) Trimming, positioning and fixing a medium-high carbon steel plate to be welded; 2) Preheating the steel plate in the step 1); 3) After adjusting the laser focal length, the laser power and the welding speed, performing laser welding on the steel plate subjected to preheating treatment in the step 2); 4) And after the laser welding is finished, carrying out heat treatment on the steel plate. Proper preheating temperature and preheating time are selected, reasonable laser welding parameters are set, and a proper heat treatment process is used for carrying out postweld treatment on the welding seam, so that the welding performance is improved, and the performances of the welded medium-high carbon steel plate are equivalent to those of a base material. The method is used for welding the high-carbon steel plate, the greatest defect is that a welding machine is required to be provided with a preheating device and an annealing device at the same time, and the annealing speed cannot be automatically adjusted due to the fact that the annealing device and the welding device follow up, so that the annealing current is required to be large, and the failure rate of the annealing device is high.
The document with the Chinese patent publication No. CN102107329 discloses a laser welding method for a bluing steel strip, which reduces the welding speed and the laser power, increases the secondary heating process and the heating power, enlarges the welding gap and realizes the laser welding process for continuously producing the steel bluing steel strip by an acid pickling-rolling combined unit by adjusting the precision of welding machine equipment and welding process parameters. The method can obviously improve the welding quality of the bluing steel strip, and the strip breakage rate can be controlled below 0.8 percent, so that the welding seam of the bluing steel strip by laser welding completely meets the requirement of continuously and stably producing the cold and hard steel bluing steel strip by an acid washing-rolling combined unit, and a new way is opened up for the production of the bluing steel strip. Thereby avoiding frequent roll replacement and damage to the working roll caused by belt breakage, reducing energy consumption and roll consumption and saving cost. The method is used for welding cold and hard steel strips, and has the greatest defect that a welding machine is required to be provided with a secondary heating device, namely an annealing device in other patents, so that the defects of large current and high failure rate of the secondary heating device exist.
Chinese patent publication No. CN103625671 discloses a method for producing high-strength steel for binding bands by acid rolling, which comprises the following steps: (1) uncoiling of hot-rolled coil raw materials: the coiling temperature of the hot-rolled coil raw material is as follows: the raw material structure of the hot-rolled coil is pearlite structure, ferrite structure and bainite structure at 500-700 ℃; the length of the head and the tail of the hot rolled coil is more than or equal to 3m; (2) laser welding process: the welding power is 9000-12000 w; the welding speed is 2-6 m/min, the wire feeding speed is 2-7 m/min, the annealing current is 100-180A, and the annealing temperature is 500-900 ℃; (3) straightening the hot-rolled coil; (4) acid washing; and (5) rolling. The industrial production of the steel for the high-strength strapping is realized by controlling the laser welding process, the elongation of the stretch bending straightener, the process parameters of the insertion amount, the temperature and the speed of turbulent acid washing and the process parameters of unit tension of the frame cold continuous rolling mill. The method is used for welding the high-strength strapping steel, the welding machine is required to be provided with the annealing device, and the annealing device and the welding device are in follow-up motion, so that the annealing current is required to be large, and the failure rate of the annealing device is high.
Chinese patent publication No. CN106222386 discloses "a method for manufacturing dual phase steel". The method comprises the following steps: flattening the hot rolled coil in an uncoiler; laser welding the former hot-rolled coil and the latter hot-rolled coil to obtain a strip steel; wherein the welding power of welding is 10000W-12000W, the welding speed is 2 m/min-6 m/min, the wire feeding speed is 2 m/min-7 m/min, the annealing current is 100A-180A, the annealing temperature is 500 ℃ to 900 ℃, and the annealed tissue is a bainite tissue; performing stretch bending straightening on the strip steel by using a stretch bending straightening machine to obtain the strip steel after the stretch bending straightening; pickling the strip steel after the stretching, bending and straightening; and pressing the pickled strip steel in a rolling mill to obtain the dual-phase steel. The method is used for welding the dual-phase steel, the welding machine is required to be provided with the annealing device, and the annealing device and the welding device are driven, so that the annealing current is required to be large, and the failure rate of the annealing device is high.
Disclosure of Invention
The invention aims to overcome the defects that the prior art needs to adopt the modes of wire filling, preheating, annealing and the like to optimize the quality of a welding seam, extra equipment needs to be added and a matched process needs to be searched, and provides the laser welding method for continuous pickling of the 65Mn high-carbon steel, which can optimize the quality of the welding seam by one-time laser welding and one-time laser heating of the welding seam, does not need to additionally add equipment, reduces investment, is simple to implement and meets the requirement of pickling through plates.
The measures for realizing the aim are as follows:
a high-carbon steel 65Mn continuous acid pickling laser welding method comprises the following steps:
1) The hot rolled plate is subjected to butt welding of a welding seam after being sheared and aligned, and a welding seam gap is reserved during butt welding; controlling the laser welding power to be 8-12 KW, the laser welding speed to be 2-5 m/min, the focusing point to be 1.4-1.6 mm below the upper surface of the steel plate, and the welded welding seam and the heat affected zone thereof are quenched martensite structures;
2) Carrying out low-power laser heating on the welding seam in the step 1), wherein the laser power is controlled to be 3-6 KW, and the moving speed of the laser heating is controlled to be 2-5 m/min; the welding seam is a tempered martensite structure;
3) And conventionally carrying out continuous pickling and post-processing.
It is characterized in that: the welding power and the thickness of the steel plate have positive correlation, and the welding speed and the thickness of the steel plate have negative correlation.
It is characterized in that: the laser heating power of the welding seam and the thickness of the steel plate form a positive correlation relationship, and the laser heating moving speed and the thickness of the steel plate form a negative correlation relationship.
Further: the width of the butt-jointed welding seam gap is controlled to be 0.1-0.2 mm.
The action and mechanism of each raw material and main process in the invention
The technological parameters for controlling laser welding are set as follows: the laser power is 8-12 KW, the welding speed is 2-5 m/min, and the laser focal length is set at the position of 1.4-1.6 mm below the surface of the steel plate, because the welding laser can give enough heat to the steel plate, the metal at the welding seam is melted, and the laser welding is realized; and the welded welding seam and the heat affected zone thereof are in a quenched martensite structure.
The laser heating is carried out on the basis of the welding seam after laser welding, the laser heating power is controlled to be 3-6 KW, and the laser heating moving speed is controlled to be 2-5 m/min.
Compared with the prior art, the invention has the advantages that the local part of the welding line is heated and melted during one-pass welding, and then the martensite structure is generated by air cooling and quenching; then the welding seam is heated by laser, so that the martensite structure is changed into tempered martensite, and the plasticity of the welding seam can be improved; and no additional equipment is needed, so that the investment is reduced; the cup bulge and the cold bending are detected to be qualified, the implementation is simple, and the requirement of pickling through plates is met.
Drawings
FIG. 1 is a metallographic structure of a weld of the present invention.
Detailed Description
The present invention is described in detail below:
table 1 is a list of chemical compositions for each example of the invention;
table 2 is a table of the main process parameters of each embodiment of the present invention;
table 3 is a table of performance testing scenarios for various embodiments of the present invention.
The examples of the invention were produced as follows
1) The hot rolled plate is subjected to butt welding of a welding seam after being sheared and aligned, and a welding seam gap is reserved during butt welding; controlling the laser welding power to be 8-12 KW, the laser welding speed to be 2-5 m/min, positioning a focus point to be 1.4-1.6 mm below the upper surface of the steel plate, and forming a welded joint and a heat affected zone thereof into a quenched martensite structure after welding;
2) Carrying out low-power laser heating on the welding seam in the step 1), wherein the laser power is controlled to be 3-6 KW, and the moving speed of the laser heating is controlled to be 2-5 m/min; the welding seam is a tempered martensite structure;
3) And conventionally carrying out continuous pickling and post-processing.
Table 1 laser welding process parameters and weld performance lists for examples of the invention and comparative examples
As can be seen from Table 1, all the welding seams processed by laser heating meet the pickling requirements, no cracking phenomenon is found along the welding seams, no welding wire is needed to be added, the original low-carbon steel laser welding machine of the pickling line is not needed to be modified, the number of maintenance equipment is not needed to be increased in later use, the laser heating position is fixed in the welding seam area, and the heating efficiency is lower than that of annealing equipment which is installed independently.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (4)
1. A high-carbon steel 65Mn continuous acid pickling laser welding method comprises the following steps:
1) The hot rolled plate is subjected to butt welding of a welding seam after being sheared and aligned, and a welding seam gap is reserved during butt welding; controlling the laser welding power to be 8-12 KW, the laser welding speed to be 2-5 m/min, positioning a focus point to be 1.4-1.6 mm below the upper surface of the steel plate, and forming a welded joint and a heat affected zone thereof into a quenched martensite structure after welding;
2) Carrying out low-power laser heating on the welding seam in the step 1), wherein the laser power is controlled to be 3-6 KW, and the moving speed of the laser heating is controlled to be 2-5 m/min; the welding seam is a tempered martensite structure;
3) The continuous pickling and the post-processing are carried out conventionally.
2. The continuous pickling laser welding method for high-carbon steel 65Mn as claimed in claim 1, characterized by comprising the following steps: the welding power and the thickness of the steel plate have positive correlation, and the welding speed and the thickness of the steel plate have negative correlation.
3. The continuous pickling laser welding method for high-carbon steel 65Mn as claimed in claim 1, characterized in that: the laser heating power of the welding seam and the thickness of the steel plate form a positive correlation relationship, and the laser heating moving speed and the thickness of the steel plate form a negative correlation relationship.
4. The continuous pickling laser welding method for high-carbon steel 65Mn as claimed in claim 1, characterized in that: the width of the butt joint gap is controlled to be 0.1-0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172594.5A CN115555719A (en) | 2022-09-26 | 2022-09-26 | Laser welding method for continuous pickling of 65Mn high-carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211172594.5A CN115555719A (en) | 2022-09-26 | 2022-09-26 | Laser welding method for continuous pickling of 65Mn high-carbon steel |
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| Publication Number | Publication Date |
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| CN115555719A true CN115555719A (en) | 2023-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211172594.5A Pending CN115555719A (en) | 2022-09-26 | 2022-09-26 | Laser welding method for continuous pickling of 65Mn high-carbon steel |
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| CN (1) | CN115555719A (en) |
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- 2022-09-26 CN CN202211172594.5A patent/CN115555719A/en active Pending
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