CN117340484A - Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa - Google Patents
Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa Download PDFInfo
- Publication number
- CN117340484A CN117340484A CN202311406244.5A CN202311406244A CN117340484A CN 117340484 A CN117340484 A CN 117340484A CN 202311406244 A CN202311406244 A CN 202311406244A CN 117340484 A CN117340484 A CN 117340484A
- Authority
- CN
- China
- Prior art keywords
- welding
- percent
- tempering
- steel
- yield strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 405
- 238000000034 method Methods 0.000 title claims abstract description 60
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 42
- 239000000956 alloy Substances 0.000 title claims abstract description 42
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 title claims abstract description 40
- 238000005496 tempering Methods 0.000 claims abstract description 78
- 238000004321 preservation Methods 0.000 claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 239000011324 bead Substances 0.000 claims abstract description 35
- 239000000126 substance Substances 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 239000007789 gas Substances 0.000 claims description 44
- 238000001816 cooling Methods 0.000 claims description 35
- 230000000171 quenching effect Effects 0.000 claims description 24
- 229910052786 argon Inorganic materials 0.000 claims description 23
- 238000010791 quenching Methods 0.000 claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000005507 spraying Methods 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 4
- 239000010953 base metal Substances 0.000 abstract description 25
- 238000010438 heat treatment Methods 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 17
- 239000000498 cooling water Substances 0.000 description 25
- 239000010410 layer Substances 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 230000007547 defect Effects 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 238000010583 slow cooling Methods 0.000 description 8
- 229920000742 Cotton Polymers 0.000 description 7
- 239000002932 luster Substances 0.000 description 7
- 238000005498 polishing Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 238000009863 impact test Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910003296 Ni-Mo Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
Abstract
The application relates to a welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa, which comprises the following steps: and welding the welded junction of the steel plate at one time by adopting gas shielded welding, wherein the chemical components of the steel plate comprise the following components in percentage by mass: 0.1 to 0.3 percent of C, 0.15 to 0.4 percent of Si, 0.8 to 1.1 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.002 percent of S, 0.25 to 0.5 percent of Cr, 1.0 to 1.4 percent of Ni, 0.4 to 0.8 percent of Mo, 0.01 to 0.06 percent of Ti, 0.03 to 0.07 percent of V, 0.01 to 0.05 percent of Nb, 0.001 to 0.005 percent of B, 0.02 to 0.06 percent of Als, and the balance of iron and unavoidable impurities; and after the primary welding is finished, performing secondary welding on the surface of the welding seam to form a tempering welding bead so as to perform heat preservation tempering treatment on the welding seam. According to the tempering heat treatment method, tempering heat treatment is carried out on the welding seam through the tempering welding bead, so that the tempering heat treatment effect basically equivalent to that of the base metal is obtained on the welding seam, and the tensile strength and impact toughness of the welded joint in a welding state are basically equivalent to those of the base metal.
Description
Technical Field
The application relates to the technical field of steel, in particular to a welding process for low-alloy ultrahigh-strength steel with yield strength of 1400 MPa.
Background
The low alloy ultra-high strength steel with 1400MPa grade yield strength, which is developed to meet the requirements of ultra-high strength and light weight for engineering machinery, has the following mechanical properties: the yield strength is more than or equal to 1400MPa, the tensile strength is more than or equal to 1650MPa, the elongation is more than or equal to 10 percent, and the impact energy at minus 40 ℃ is more than or equal to 36J.
For the consumable electrode active gas shielded welding (MAG) of the low alloy ultrahigh-strength steel with the yield strength of 1400MPa, as the tensile strength grade of the welding material on the market at present is 980MPa at most, the chemical composition of the welding material is close to that of the low alloy ultrahigh-strength steel with the yield strength of 1400MPa, but the toughness of a welding seam is poor in a welding state, so that the performance of a welding joint is far lower than that of a base metal, and the bearing capacity of the steel is seriously reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the application provides a welding process of low alloy ultrahigh strength steel with 1400 MPa-grade yield strength, which aims at improving the impact toughness of welded joints after welding and further improving the overall bearing capacity of the steel.
The embodiment of the application provides a welding process of low-alloy ultrahigh-strength steel with 1400 MPa-level yield strength, which comprises the following steps:
and welding the welded junction of the steel plate by adopting gas shielded welding, wherein the steel plate comprises the following chemical components in percentage by mass: 0.1 to 0.3 percent of C, 0.15 to 0.4 percent of Si, 0.8 to 1.1 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.002 percent of S, 0.25 to 0.5 percent of Cr, 1.0 to 1.4 percent of Ni, 0.4 to 0.8 percent of Mo, 0.01 to 0.06 percent of Ti, 0.03 to 0.07 percent of V, 0.01 to 0.05 percent of Nb, 0.001 to 0.005 percent of B, 0.02 to 0.06 percent of Als, and the balance of iron and unavoidable impurities;
and after the primary welding is finished, performing secondary welding on the surface of the welding seam to form a tempering welding bead so as to perform heat preservation tempering treatment on the welding seam.
According to the welding process provided by the embodiment of the application, after one-time welding is finished, in order to enable the welding seam to achieve tempering treatment equivalent to that of the base metal, a layer of tempering welding bead is welded at the welding seam, and the tempering welding bead enables the welding seam to obtain tempering effect equivalent to that of the base metal through heat preservation tempering. In the embodiment of the application, the tempering heat treatment effect basically equivalent to that of the base metal is achieved by the process operation of one-time welding and tempering weld bead matching, so that the impact toughness of the welded joint in a welded state is improved, and the welded joint has the impact toughness equivalent to that of the low-alloy ultrahigh-strength steel with the yield strength of 1400 MPa.
In some embodiments of the present application, the soak tempering treatment is at a temperature of 200-300 ℃.
In some embodiments of the present application, the time T of the soak tempering treatment satisfies: t=1.4t+ (50-60) min, where T is the steel sheet thickness.
In some embodiments of the present application, the one-time welding comprises: and welding the welded junction of the steel plate by adopting gas shielded welding, and quenching the solidified welded junction behind the welding pool.
In some embodiments of the present application, the water spray cooling of the weld puddle where it has solidified comprises: and spraying water to cool the solidified weld joint at the position 10-15 mm behind the welding pool.
In some embodiments of the present application, the temperature at the solidified weld joint behind the weld puddle is 850-950 ℃.
In some embodiments of the present application, the water temperature of the water spray cooling is 15-25 ℃.
In some embodiments of the present application, the water pressure of the water spray cooling is 0.2 to 1.6MPa.
In some embodiments of the present application, the water spray direction of the water spray cooling is opposite to the weld advancing direction.
In some embodiments of the present application, the parameters of the gas shielded welding are: the welding current is 120-160A, the welding voltage is 13-21V, and the welding heat input Q meets the following conditions: q=t±1kJ/cm, where t is the steel sheet thickness.
In some embodiments of the present application, the preheating treatment is not performed prior to the one-time welding.
In some embodiments of the present application, the gas shielded welding wire comprises the following chemical composition: c:0.05 to 0.12 weight percent, si:0.3 to 0.55 weight percent, mn:1.2 to 1.6 weight percent, cr:0.1 to 0.8 weight percent of Ni:1.8 to 2.9 weight percent, mo:0.5 to 1.2 weight percent, ti:0 to 0.3 weight percent, V:0 to 0.1 weight percent, P:0 to 0.02 weight percent, S:0 to 0.02wt% and the balance of Fe and unavoidable impurities.
In some embodiments of the present application, the shielding gas for gas shielded welding is 95% Ar+5% CO 2 Or 98% Ar+2% O 2 Argon-rich mixed gas.
In some embodiments, the thickness of the steel sheet is 4mm or less.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described, and it is possible for a person skilled in the art to obtain other drawings according to these drawings without inventive effort.
FIG. 1 is a schematic cross-sectional view of a "flashback bead" in an embodiment of the present application.
FIG. 2 is a schematic illustration of "water spray cooling" in an embodiment of the present application;
reference numerals illustrate: 1. a steel plate; 2. a welding gun; 3. a cooling water pipe; 4. welding seams; 5. and (5) tempering the welding bead.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing an example of the present application. In the drawings and the following description, at least some well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present application; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present application, it is to be noted that the meaning of "plurality" is two or more unless otherwise indicated. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The heat treatment process of the low alloy ultra-high strength steel with the yield strength of 1400MPa grade comprises the steps of quenching at 820-940 ℃ and tempering at 200-300 ℃, wherein the water temperature for quenching is 15-25 ℃, the tempering heat preservation time is 1.4t+ (45-60) min, and t is the thickness of the steel plate; the tissue is tempered sorbite.
For the consumable electrode active gas shielded welding (MAG) of low alloy ultra-high strength steel with the yield strength of 1400MPa, the welding material on the market at present has the highest tensile strength grade of 980MPa, and the main chemical components comprise: c:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.1wt%, V:0.03wt%, P:0.009wt%, S:0.013wt% of a welding wire, wherein the main chemical components of the welding wire are close to or even exceed that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, but the tensile strength grade of a welding line is far lower than that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa in a welding state; in addition, after the welding heat circulation, a certain softening phenomenon exists in a welding heat affected zone, so that the tensile strength of a welding joint is far lower than that of a base metal, and the bearing capacity of the low alloy ultrahigh-strength steel with the yield strength of 1400MPa is seriously reduced.
In the prior art, chinese patent application CN105598596A discloses a 1200MPa high-strength steel non-preheating combined welding method, wherein a combined welding method of low-strength welding wire backing welding, cover layer and back cover layer welding and high-strength welding wire filling welding is adopted, so that welding crack sensitivity is reduced, and the tensile strength of a welding joint is only 700-900 MP. Chinese patent application CN111872561B discloses a welding joint and a welding method of low-alloy ultrahigh-strength steel, and aims at a 1600 MPa-level Mn-Cr-Ni-Mo low-alloy ultrahigh-strength medium-thickness steel plate, a laser-double-wire MAG composite welding process is adopted, the laser power is 1.5-5 kW, the welding speed is 0.8-2.5 m/min, the welding parameters, welding wire types and diameters of a first gun and a second gun are respectively controlled, the welding joint is not preheated before welding, the interlayer temperature is controlled at 150-170 ℃, and the tensile strength of the finally obtained welding joint can only reach 1300MPa.
It can be seen that under the condition that the post-welding heat treatment is not performed, the tensile strength of the welded joint is difficult to reach or approach to the tensile strength grade of the base metal, and the impact toughness of the welded joint is also much lower than that of the base metal.
Based on the above, the inventors have made a great deal of research to provide a low-cost and high-efficiency welding process for improving the tensile strength and impact toughness of a welding joint of low alloy and ultra-high strength steel with 1400 MPa-grade yield strength, so that the tensile strength and impact toughness of the welding joint are basically equivalent to those of a base metal.
The embodiment of the application provides a welding process of low-alloy ultrahigh-strength steel with 1400 MPa-grade yield strength, which comprises the following steps of:
and welding the welded junction of the steel plate for one time by adopting gas shielded welding, wherein the steel plate comprises the following chemical components in percentage by mass: 0.1 to 0.3 percent of C, 0.15 to 0.4 percent of Si, 0.8 to 1.1 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.002 percent of S, 0.25 to 0.5 percent of Cr, 1.0 to 1.4 percent of Ni, 0.4 to 0.8 percent of Mo, 0.01 to 0.06 percent of Ti, 0.03 to 0.07 percent of V, 0.01 to 0.05 percent of Nb, 0.001 to 0.005 percent of B, 0.02 to 0.06 percent of Als, and the balance of iron and unavoidable impurities;
and after the primary welding is finished, performing secondary welding on the surface of the welding seam to form a tempering welding bead so as to perform heat preservation tempering treatment on the welding seam.
In the embodiment of the application, MAG welding is adopted to weld low alloy ultrahigh-strength steel with the yield strength of 1400MPa, after one-time welding is completed, tempering heat treatment is further carried out on the welding seam, as shown in fig. 1, a layer of tempering weld bead 5 is formed on the welding seam 4 by continuous welding, the tempering weld bead 5 can play a role in heat preservation tempering, and the welding seam 4 is further subjected to tempering heat treatment.
It will be understood by those skilled in the art that "tempering weld bead" refers to the primary heating (or heat cycle) of the weld metal of the preceding weld during the multi-layer, multi-pass weld, which corresponds to tempering the metal of the preceding weld. According to the embodiment of the application, in the welding process of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, in order to enable the welding seam to achieve the tempering effect basically equivalent to that of a base metal, a tempering welding bead is welded at the welding seam position to perform heat preservation tempering treatment on the welding seam. By carrying out heat preservation tempering on the welding seam, the tempering heat treatment process which is the same as or close to that of the base metal is applied to the welding seam, so that the tempering treatment effect which is close to that of the base metal is obtained on the welding seam, and the impact toughness and the strength performance of the welding joint are improved. In the embodiment of the application, the heat-preservation tempering treatment is performed on the welding line through the tempering welding bead, the process is simple, complex heat treatment equipment is not needed, the process is simple, the heat treatment effect of the welding line equivalent to that of the base metal can be achieved, and then the impact toughness of the welding joint is improved.
In some embodiments, the soak tempering treatment comprises: and wrapping the tempering weld bead by using a heat insulation material so as to perform heat insulation tempering treatment on the weld bead.
According to the embodiment of the application, the heat insulation material is used for wrapping the tempering weld bead, so that the cooling rate of the tempering weld bead can be effectively reduced, the tempering treatment is carried out on the weld joint position at the designated heat insulation temperature, and the phenomenon that the performance of the tempered weld joint is not as expected after the tempering treatment due to the fact that the tempering effect is influenced too quickly by the cooling of the weld joint is avoided.
In the embodiment of the application, the heat-insulating material can be non-combustible or flame-retardant heat-insulating materials such as heat-insulating cotton.
In some embodiments, the soak tempering is at a temperature of 200-300 ℃.
In the embodiment of the application, the tempering weld bead is formed by welding one layer on the surface of the welded seam after welding and is wrapped by the heat insulation material, so that the heat insulation tempering treatment is carried out on the welded seam, and in the heat insulation tempering treatment process, the tempering weld bead is subjected to temperature detection so as to carry out temperature adjustment on the tempering weld bead. And (3) carrying out heat preservation treatment on the tempered weld bead when the tempered weld bead is cooled to be close to 300 ℃ so as to obtain a tempering effect on the weld bead, simultaneously carrying out real-time temperature measurement during heat preservation, and reheating the weld bead when the weld bead is cooled to be close to 200 ℃ so as to keep the temperature of the weld bead within the range of 200-300 ℃.
According to the embodiment of the application, the temperature of heat preservation tempering treatment is controlled within the temperature range, so that the position of the welding seam and the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa level can have the same or similar tempering heat treatment temperature, and further the welding seam can obtain the tempering heat treatment effect equivalent to that of the base metal, so that the welded joint can obtain the impact toughness equivalent to that of the base metal.
In some embodiments, the time T of the soak tempering process is as follows: t=1.4t+ (50-60) min, where T is the steel sheet thickness.
According to the embodiment of the application, the time of heat preservation tempering treatment is controlled within the range, so that the position of the welding seam and the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa level can have the same or similar tempering heat treatment time length, and the welding seam further obtains the tempering heat treatment effect equivalent to that of a base metal, so that the welded joint obtains the impact toughness equivalent to that of the base metal.
In some embodiments, one weld comprises: and welding the welded junction of the steel plate by adopting gas shielded welding, and quenching the solidified welded junction behind the welding pool.
According to the embodiment of the application, in the welding process, a welding line at a certain distance behind a welding pool is solidified and still at a higher temperature, so that in order to achieve the same quenching strengthening effect as that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, quenching treatment is performed at the solidified welding line, and the welding line is subjected to quenching strengthening at a certain temperature, so that the same quenching effect as that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa is obtained; and carrying out heat preservation tempering treatment on the welding seam by combining a tempering welding bead welded at the welding seam position, and carrying out heat preservation tempering on the welding seam to ensure that the welding seam obtains tempering heat treatment which is the same as or close to that of a base material. Therefore, in the embodiment of the application, the welding line obtains the quenching and tempering heat treatment effect which is the same as or close to that of the low alloy ultrahigh-strength steel with the yield strength of 1400MPa level by combining the process operations of water spray cooling, tempering welding line and thermal insulation material wrapping, so that the strength of the welding line position is improved, and the tensile strength and impact toughness of the welding joint which is basically equivalent to those of a base metal in a welding state are realized.
The quenching treatment may be water quenching at the solidified weld, for example, as shown in fig. 2, when welding the steel plate 1, a cooling water pipe 3 is disposed at a certain distance behind the welding gun 2 to perform water spray cooling to quench and strengthen the weld 4, and the cooling water pipe 3 moves forward synchronously with the welding gun 2 to subject the weld 4 to quenching heat treatment.
In some embodiments, water spray cooling of the weld puddle where it has solidified includes: and spraying water to cool the solidified weld joint at the position 10-15 mm behind the welding pool.
According to the embodiment of the application, the welding line is solidified at the position 10-15 mm behind the welding pool, but still at a higher temperature, and the temperature of the welding line at the position is close to the quenching treatment temperature of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, so that the quenching treatment is performed by spraying water and cooling at the position, the quenching heat treatment effect of the welding line position is more close to the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, and the welding joint is further enabled to obtain the tensile strength more close to that of a base metal.
In some embodiments, the water temperature of the water spray cooling is 15-25 ℃.
In some embodiments, the temperature at the solidified weld behind the weld pool is 850-950 ℃.
According to the embodiment of the application, the water temperature is controlled within the range, so that a good quenching effect of the welding line can be obtained.
In some embodiments, the water spray direction of the water spray cooling is opposite to the weld advance direction.
According to the embodiment of the application, the cooling water is sprayed out along the direction opposite to the welding progress, so that the influence on welding quality and construction operation caused by the fact that a large amount of cooling water is sprayed to a welding pool and a welding gun can be avoided, the influence on operators can be reduced, and the safety of the welding process is improved.
According to the embodiment of the application, the temperature of the solidified welding seam behind the welding pool refers to the temperature of the welding seam at a water spraying cooling position, namely, the temperature for carrying out water quenching treatment on the welding seam is controlled to be 850-950 ℃, the temperature is also the temperature range for carrying out quenching treatment on the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, and the quenching treatment effect of the welding seam can be more similar to that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa by controlling the water quenching temperature of the welding seam in the range, so that the welding joint can obtain the tensile strength equivalent to that of a base metal.
In some embodiments, no heat treatment is performed prior to one weld.
According to the embodiment of the application, the welding process provided by the embodiment of the application does not need to carry out heat treatment before welding, so that the welding cost can be reduced, the welding efficiency can be improved, and the strength of a welding joint can not be influenced.
In some embodiments, the welded portion of the steel sheet is polished to expose metallic luster before one welding.
According to the embodiment of the application, the impurity of the welding part is removed through polishing before welding, so that the welding part is smoother, and welding defects are avoided.
In some embodiments, the welding current is 120-160A.
In some embodiments, the welding voltage is 13-21V.
In some embodiments, the welding heat input Q satisfies: q=t±1kJ/cm, where t is the steel sheet thickness.
According to the embodiment of the application, the welding parameters of the gas shielded welding are controlled within the range, so that the welding seam position has a better welding effect, and higher strength performance is obtained.
In some embodiments, the shielding gas for gas shielded welding is 95% Ar+5% CO 2 Or 98% Ar+2% O 2 Argon-rich mixed gas.
80% Ar+20% CO used for conventional gas shielded welding 2 Compared with the argon-rich mixed gas, 95 percent Ar+5 percent CO 2 Or 98% Ar+2% O 2 The oxidizing property of the argon-rich mixed gas is lower, and the burning loss of alloy elements in the welding process can be effectively reduced, so that the welded joint is facilitated to obtain the tensile strength and impact toughness basically equivalent to those of a base metal.
In some embodiments, the gas shielded welding wire comprises the following chemical composition: c:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.1wt%, V:0.03wt%, P:0.009wt%, S:0.013wt% of Fe and unavoidable impurities in balance.
According to the welding wire with the chemical composition, the chemical composition of the welding wire is basically the same as that of the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa, so that the welding seam can be ensured to have alloy elements and contents basically close to those of a base metal, and the welding joint can further obtain the tensile strength and impact toughness close to those of the base metal.
In some embodiments, the thickness of the steel plate is 4mm or less.
According to the embodiment of the application, when the steel plate is quenched in a water spray cooling mode, if the thickness of the steel plate is too thick, the steel plate cannot be quenched, and further the expected quenching strengthening effect cannot be achieved, so that the thickness of the steel plate is controlled to be lower than 4mm, the steel plate can be fully quenched in the water spray cooling mode, and further the quenching strengthening effect is effectively improved.
In some embodiments, the welded joint obtained according to the welding process described above has a tensile strength of not less than 1600MPa.
In some embodiments, the welded joint obtained by the welding process described above has an impact energy of not less than 36J at-40 ℃.
According to the embodiment of the application, the welding seam is quenched and tempered by adopting the welding process, so that the welding joint can obtain the tensile strength and impact toughness basically equivalent to those of a base metal, and the bearing performance of the steel is effectively improved.
Examples
The invention is illustrated by the following specific examples. It should be noted that the embodiments described below are exemplary only for explaining the present application and are not to be construed as limiting the present application. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
Adopting Q1400E steel plate with the thickness of 4mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98 percent Ar+2 percent O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 150A, welding voltage 18V, welding speed 27cm/min, and welding heat input 4.8kJ/cm; the welding process is as follows:
(1) Polishing the welding part before welding to expose metallic luster, reserving a gap of 2mm, and welding the welding position once;
(2) After the primary welding is finished, cleaning welding slag, welding a layer of tempering welding bead on the surface of the welding seam, immediately measuring the temperature after welding, adopting heat-preserving cotton to carry out heat preservation and slow cooling when the temperature of the welding seam is reduced to 300 ℃, measuring the temperature in real time during heat preservation, adopting a flame gun to reheat the welding seam to 300 ℃ to carry out heat preservation when the temperature reaches 210 ℃, repeatedly carrying out the operation until the heat preservation time of the welding seam reaches 60min, and carrying out slow cooling to room temperature.
By adopting the welding process, the welding joint has no defects of cracks, air holes and the like, the tensile strength of the welding joint is 1260MPa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 36J, and the cold bending test is qualified.
Example 2
Adopting Q1400E steel plate with the thickness of 4mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98 percent Ar+2 percent O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 150A, welding voltage 18V, welding speed 27cm/min, and welding heat input 4.80kJ/cm; the welding process is as follows:
(1) Polishing a welding position before welding to expose metallic luster, reserving a gap of 2mm, welding a welding position once, arranging a cooling water pipe behind a welding pool, spraying water to the welding position by using the cooling water pipe for cooling, and enabling the cooling water pipe and a welding gun to move synchronously, wherein the cooling position is positioned at a position 12mm behind the welding pool, the temperature of the welding seam at the position is 870-910 ℃, the water flow spraying direction is opposite to the welding advancing direction, the water temperature in the cooling water pipe is controlled at 15-25 ℃, and the water spraying pressure is controlled at 1.2MPa;
(2) After the primary welding is finished, cleaning welding slag, drying moisture on the surface of a welding line, welding a layer of tempering welding bead on the surface of the welding line, immediately measuring temperature after welding, carrying out heat preservation and slow cooling by adopting heat preservation cotton when the temperature of the welding line is reduced to 300 ℃, carrying out heat preservation by adopting a flame gun when the temperature reaches 210 ℃, and repeatedly carrying out the operation until the heat preservation time of the welding line reaches 60min, and slowly cooling to room temperature.
By adopting the welding process, the welded joint has no defects of cracks, air holes and the like, the tensile strength of the welded joint is 1610Mpa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 36J, and the cold bending test is qualified.
Example 3
Adopting Q1400E steel plate with thickness of 3mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98% Ar+2% O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 120A, welding voltage 14V, welding speed 22cm/min, and welding heat input 3.67kJ/cm; the welding process is as follows:
(1) Polishing a welding part before welding to expose metallic luster, reserving a gap of 1.5mm, welding a welding position once, arranging a cooling water pipe behind a welding pool, spraying water to the welding position by using the cooling water pipe for cooling, and enabling the cooling water pipe and a welding gun to synchronously move, wherein the cooling position is positioned at a position 13mm behind the welding pool, the temperature of the welding seam is 870-910 ℃, the water flow spraying direction is opposite to the welding advancing direction, the water temperature in the cooling water pipe is controlled at 15-20 ℃, and the water spraying pressure is controlled at 1.0MPa;
(2) After the primary welding is finished, cleaning welding slag, drying moisture on the surface of a welding line, welding a layer of tempering welding bead on the surface of the welding line, immediately measuring temperature after welding, carrying out heat preservation and slow cooling by adopting heat preservation cotton when the temperature of the welding line is reduced to 300 ℃, carrying out heat preservation by adopting a flame gun when the temperature reaches 210 ℃, and repeatedly carrying out the operation until the heat preservation time of the welding line reaches 58min, and slowly cooling to room temperature.
By adopting the welding process, the welded joint has no defects such as cracks, air holes and the like, the tensile strength of the welded joint is 1615MPa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 36J, and the cold bending test is qualified.
Example 4
Adopting Q1400E steel plate with thickness of 3mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98% Ar+2% O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 120A, welding voltage 14V, welding speed 22cm/min, and welding heat input 3.67kJ/cm; the welding process is as follows:
(1) Polishing a welding part before welding to expose metallic luster, reserving a gap of 1.5mm, welding a welding position once, arranging a cooling water pipe behind a welding pool, spraying water to the welding position by using the cooling water pipe for cooling, and enabling the cooling water pipe and a welding gun to synchronously move, wherein the cooling position is positioned at a position 20mm behind the welding pool, the temperature of the welding seam at the position is 420-500 ℃, the water spraying direction is opposite to the welding advancing direction, the water temperature in the cooling water pipe is controlled at 15-25 ℃, and the water spraying pressure is controlled at 1.5MPa;
(2) After the primary welding is finished, cleaning welding slag, drying moisture on the surface of a welding line, welding a layer of tempering welding bead on the surface of the welding line, immediately measuring temperature after welding, carrying out heat preservation and slow cooling by adopting heat preservation cotton when the temperature of the welding line is reduced to 300 ℃, carrying out heat preservation by adopting a flame gun when the temperature reaches 210 ℃, and repeatedly carrying out the operation until the heat preservation time of the welding line reaches 58min, and slowly cooling to room temperature.
By adopting the welding process, the welding joint has no defects such as cracks, air holes and the like, the tensile strength of the welding joint is 1150MPa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 36J, and the cold bending test is qualified.
Example 5
Adopting Q1400E steel plate with thickness of 3mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98% Ar+2% O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 120A, welding voltage 14V, welding speed 22cm/min, and welding heat input 3.67kJ/cm; the welding process is as follows:
(1) Polishing a welding part before welding to expose metallic luster, reserving a gap of 1.5mm, welding a welding position once, arranging a cooling water pipe behind a welding pool, spraying water to the welding position by using the cooling water pipe for cooling, and enabling the cooling water pipe and a welding gun to synchronously move, wherein the cooling position is positioned at a position 13mm behind the welding pool, the temperature of the welding seam is 870-910 ℃, the water flow spraying direction is opposite to the welding advancing direction, the water temperature in the cooling water pipe is controlled at 15-20 ℃, and the water spraying pressure is controlled at 1.0MPa;
(2) After the primary welding is finished, cleaning welding slag, drying moisture on the surface of a welding line, welding a layer of tempering welding bead on the surface of the welding line, immediately measuring temperature after welding, carrying out heat preservation and slow cooling by adopting heat preservation cotton when the temperature of the welding line is reduced to 400 ℃, carrying out heat preservation by adopting a flame gun when the temperature reaches 300 ℃, and carrying out heat preservation by reheating the welding line to 400 ℃, repeating the operation until the heat preservation time of the welding line reaches 58min, and carrying out slow cooling to room temperature.
By adopting the welding process, the welded joint has no defects such as cracks, air holes and the like, the tensile strength of the welded joint is 1450MPa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 36J, and the cold bending test is qualified.
Example 6
Adopting Q1400E steel plate with thickness of 3mm, adopting consumable electrode gas shielded welding, wherein the protective gas is 98% Ar+2% O 2 Argon-rich mixed gas; the welding wire adopts GHS-110 welding wire, the diameter of which is 1.2mm, and the main chemical components of the welding wire comprise C:0.1wt%, si:0.46wt%, mn:1.49wt%, cr:0.6wt%, ni:2.4wt%, mo:0.9wt%, ti:0.04wt%; the following parameters were used for welding: welding current 120A, welding voltage 14V, welding speed 22cm/min, and welding heat input 3.67kJ/cm; the welding process is as follows:
(1) Polishing a welding part before welding to expose metallic luster, reserving a gap of 1.5mm, welding a welding position once, arranging a cooling water pipe behind a welding pool, spraying water to the welding position by using the cooling water pipe for cooling, and enabling the cooling water pipe and a welding gun to synchronously move, wherein the cooling position is positioned at a position 13mm behind the welding pool, the temperature of the welding seam is 870-910 ℃, the water flow spraying direction is opposite to the welding advancing direction, the water temperature in the cooling water pipe is controlled at 15-20 ℃, and the water spraying pressure is controlled at 1.0MPa;
(2) After the primary welding is finished, cleaning welding slag, drying moisture on the surface of a welding line, welding a layer of tempering welding bead on the surface of the welding line, immediately measuring temperature after welding, carrying out heat preservation and slow cooling by adopting heat preservation cotton when the temperature of the welding line is reduced to 300 ℃, carrying out heat preservation by adopting a flame gun when the temperature reaches 210 ℃, and repeatedly carrying out the operation until the heat preservation time of the welding line reaches 42min, and slowly cooling to room temperature.
By adopting the welding process, the welding joint has no defects such as cracks, air holes and the like, the tensile strength of the welding joint is 1700MPa, the impact energy of a V-shaped notch impact test of weld metal at the test temperature of minus 40 ℃ is more than 27J, and the cold bending test is qualified.
Comparative example 1
The welding is carried out by adopting a Q1400E steel plate with the thickness of 4mm and using the conventional welding process in the prior art, namely, water spray cooling and tempering, and the heat preservation tempering treatment of a tempering weld pass are not carried out, and the welding parameters are consistent with those of the embodiment 2.
By adopting the welding process, the welded joint has no defects of cracks, air holes and the like, and the tensile strength of the welded joint is 1260MPa through detection.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A welding process of low alloy ultra-high strength steel with 1400 MPa-level yield strength, which is characterized by comprising the following steps:
and welding the welded junction of the steel plate at one time by adopting gas shielded welding, wherein the chemical components of the steel plate comprise the following components in percentage by mass: 0.1 to 0.3 percent of C, 0.15 to 0.4 percent of Si, 0.8 to 1.1 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.002 percent of S, 0.25 to 0.5 percent of Cr, 1.0 to 1.4 percent of Ni, 0.4 to 0.8 percent of Mo, 0.01 to 0.06 percent of Ti, 0.03 to 0.07 percent of V, 0.01 to 0.05 percent of Nb, 0.001 to 0.005 percent of B, 0.02 to 0.06 percent of Als, and the balance of iron and unavoidable impurities;
and after the primary welding is finished, performing secondary welding on the surface of the welding seam to form a tempering welding bead so as to perform heat preservation tempering treatment on the welding seam.
2. Welding process of low alloy ultra high strength steel with yield strength 1400MPa grade according to claim 1, characterized in that the temperature of the heat preservation tempering treatment is 200-300 ℃, and/or
The heat preservation time T of the heat preservation tempering treatment meets the following conditions: t=1.4t+ (50-60) min, where T is the steel sheet thickness.
3. The welding process of 1400 MPa-grade low-alloy ultrahigh-strength steel with yield strength according to claim 1, wherein the one-time welding comprises: and welding the welded junction of the steel plate by adopting gas shielded welding, and quenching the solidified welded junction behind the welding pool.
4. A welding process for low alloy, ultra high strength steel having a yield strength of 1400MPa grade according to claim 3, wherein the quenching treatment comprises: and (5) carrying out water spray cooling on the solidified weld joint at the position 10-15 mm behind the welding pool.
5. The welding process for the low-alloy ultrahigh-strength steel with the yield strength of 1400MPa according to claim 4,
the temperature of the solidified weld joint behind the welding pool is 850-950 ℃, and/or
The water temperature of the water spray cooling is 15-25 ℃, and/or
The water pressure of the water spray cooling is 0.2-1.6 MPa, and/or
The water spraying direction of the water spraying cooling is opposite to the welding advancing direction.
6. The welding process of 1400 MPa-grade low-alloy ultrahigh-strength steel with yield strength according to claim 1, wherein the preheating treatment is not performed before the one-time welding.
7. The welding process of 1400 MPa-grade low-alloy ultrahigh-strength steel with yield strength according to claim 1, wherein the parameters of the gas shielded welding are: the welding current is 120-160A, the welding voltage is 13-21V, and the welding heat input Q meets the following conditions: q=t±1kJ/cm, where t is the steel sheet thickness.
8. The welding process of 1400 MPa-grade low-alloy ultrahigh-strength steel with yield strength according to claim 1 or 7, wherein the shielding gas for gas shielded welding is 95% Ar+5% CO 2 Or 98% Ar+2% O 2 Argon-rich mixed gas.
9. The welding process of 1400 MPa-grade low-alloy ultra-high-strength steel with yield strength according to claim 1, wherein the welding wire for gas shielded welding comprises the following chemical composition: c:0.05 to 0.12 weight percent, si:0.3 to 0.55 weight percent, mn:1.2 to 1.6 weight percent, cr:0.1 to 0.8 weight percent of Ni:1.8 to 2.9 weight percent, mo:0.5 to 1.2 weight percent, ti:0 to 0.3 weight percent, V:0 to 0.1 weight percent, P:0 to 0.02 weight percent, S:0 to 0.02wt% and the balance of Fe and unavoidable impurities.
10. The welding process of 1400 MPa-grade low-alloy ultrahigh-strength steel with yield strength according to claim 1, wherein the thickness of the steel plate is less than or equal to 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311406244.5A CN117340484A (en) | 2023-10-26 | 2023-10-26 | Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311406244.5A CN117340484A (en) | 2023-10-26 | 2023-10-26 | Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117340484A true CN117340484A (en) | 2024-01-05 |
Family
ID=89359314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311406244.5A Pending CN117340484A (en) | 2023-10-26 | 2023-10-26 | Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117340484A (en) |
-
2023
- 2023-10-26 CN CN202311406244.5A patent/CN117340484A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100711454B1 (en) | Laser welding method for endless hot rolling and the apparatus therefor | |
| US7618503B2 (en) | Method for improving the performance of seam-welded joints using post-weld heat treatment | |
| KR101860128B1 (en) | Method for laser welding one or more workpieces made of hardenable steel in a butt joint | |
| US9616527B2 (en) | Process for laser-arc hybrid welding aluminized metal workpieces | |
| CN107442915A (en) | The narrow overlap joint welding method of the phosphorous high-strength IF steel of 440MPa level cold rollings | |
| EP3676047A1 (en) | Method for laser beam welding of one or more steel sheets made of press-hardenable manganese-boron steel | |
| KR102037648B1 (en) | Hot-pressed member and manufacturing method therefor | |
| WO2008088834A1 (en) | Method for improving the performance of seam-welded joints using post-weld heat treatment | |
| US20230339037A1 (en) | Resistance spot welding method and method for manufacturing resistance spot welded joint | |
| DE10047492A1 (en) | Welding metallic work material with inductive preheating has conventional welding tools like arc welders or roller electrodes coupled with inductor(s) with inductor power of 15 to 30 kW | |
| KR100711453B1 (en) | Welding method of high carbon steel for endless hot rolling | |
| CN114406512B (en) | Welding and electric pulse heat treatment process for dissimilar alloy | |
| CN110871312B (en) | MAG welding method of low-alloy steel plate with yield strength of 600MPa | |
| CN114905149B (en) | Laser powder filling welding and heat treatment method for coated steel | |
| CN111872561B (en) | Welding joint and welding method of low-alloy ultrahigh-strength steel | |
| CN117340484A (en) | Welding process of low-alloy ultrahigh-strength steel with yield strength of 1400MPa | |
| CN117415519A (en) | Welding process of low-alloy ultrahigh-strength steel with 1300 MPa-level yield strength | |
| CA3163982C (en) | Pre-coated steel sheet comprising an additional coating for increasing the mechanical strength of the weld metal zone of a welded steel part prepared from said pre-coated sheet | |
| CN117399851A (en) | Welding process of low-alloy high-strength steel with yield strength of 1100MPa | |
| JPH08309428A (en) | Production of welded steel tube | |
| JP7099330B2 (en) | Steel Sheet, Tailored Blank, Hot Press Formed Product, Steel Tubular Tailored Blank, Hollow Hot Press Formed Product, and Steel Sheet Manufacturing Method | |
| CN111069751A (en) | Application of low-carbon gas shield welding wire in welding of 40Cr plate and Q355 plate | |
| CN114850675B (en) | Laser welding method for 1000 MPa-grade cold-rolled high-strength steel hot-rolled substrate | |
| CN110640270A (en) | Steel plate welding process capable of resisting lateral bending | |
| CN114535847B (en) | Method for welding ultra-high-strength steel by adopting double-electrode MAG |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |