CN111571061A - Gas shielded welding wire - Google Patents
Gas shielded welding wire Download PDFInfo
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- CN111571061A CN111571061A CN202010456140.5A CN202010456140A CN111571061A CN 111571061 A CN111571061 A CN 111571061A CN 202010456140 A CN202010456140 A CN 202010456140A CN 111571061 A CN111571061 A CN 111571061A
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
The invention provides a gas shielded welding wire, which comprises the following chemical components in percentage by mass: c: 0.030 to 0.060, Si: 0.20 to 0.50, Mn: 1.50 to 1.90, Ni: 1.50 to 2.20, Mo: 0.20 to 0.60, Ti: 0.050 to 0.10, S: less than or equal to 0.010, P: less than or equal to 0.005, less than or equal to 100ppm of O, less than or equal to 50ppm of N, less than or equal to 1ppm of H, and the balance of Fe and inevitable impurities. The gas shielded welding wire is a low-alloy steel gas shielded welding wire for low-carbon Mn-Ni-Mo series low-crack sensitivity welding, can be used for low-alloy high-strength steel non-preheating welding or low-temperature preheating welding below 100 ℃, and has low crack sensitivity while ensuring good low-temperature impact toughness.
Description
Technical Field
The invention relates to the technical field of low-alloy high-strength steel welding materials, in particular to a gas shielded welding wire.
Background
Low-alloy high-strength steel is an extremely important industrial raw material, has good weldability and low cost, and is widely used in various welded structures. The steel grade of the low-alloy high-strength steel thick-wall structural engineering application is gradually improved to a higher grade from the traditional Q345 and Q550. The low-alloy high-strength steel is characterized by high strength and strong welding cold crack sensitivity. With the improvement of the strength grade and the increase of the thickness of the steel for welding structures, the problem of welding cold cracks of the low-alloy high-strength steel is more obvious, and in addition, with the increase of alloy elements, the problem of welding hot cracks is also shown. Welding cold cracking has become a major problem in welding low alloy, high strength steels.
In a traditional welding process, measures such as pre-welding preheating, heat preservation in the welding process, post-welding heating and the like are generally adopted to prevent the generation of cold cracks, so that the efficiency is reduced, the cost is increased, the working condition and the environment are deteriorated, and the softening tendency of a welding heat affected zone is increased. In addition, in some special welding structures, pre-welding preheating is difficult to realize, even preheating is not allowed, and the application of the low-alloy high-strength steel is also obviously limited. The existing commercial gas shielded welding wire usually requires a welding preheating temperature of 100-165 ℃, is difficult to realize non-preheating or low-temperature preheating welding of low-alloy high-strength steel, and has a high crack rate under the condition of non-preheating, for example, when a 700MPa grade welding wire is not subjected to preheating welding, the crack rate is up to 70%. Gas shielded welding wires of the prior art often have difficulty ensuring that the metal at the weld joint has low temperature impact toughness combined with low crack sensitivity.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a gas shielded welding wire which is a low-alloy steel welding wire for low-carbon Mn-Ni-Mo series welding with low crack sensitivity, is suitable for non-preheating welding or low-temperature preheating welding, and has low crack sensitivity while ensuring that metal at a welding seam has low-temperature impact toughness.
To achieve the above object, embodiments of the present invention are as follows:
in one embodiment, the invention provides a gas shielded welding wire, which comprises the following chemical components in percentage by mass: c: 0.030 to 0.060, Si: 0.20 to 0.50, Mn: 1.50 to 1.90, Ni: 1.50 to 2.20, Mo: 0.20 to 0.60, Ti: 0.050 to 0.10, S: less than or equal to 0.010, P: less than or equal to 0.005, less than or equal to 100ppm of O, less than or equal to 50ppm of N, less than or equal to 1ppm of H, and the balance of Fe and inevitable impurities.
In another embodiment, the invention provides a gas shielded welding wire, which comprises the following chemical components in percentage by mass: c: 0.030-0.055, Si: 0.30-0.40, Mn: 1.60-1.80, Ni: 1.70-2.20, Mo: 0.30 to 0.55, Ti: 0.050 to 0.090, S: less than or equal to 0.010, P: less than or equal to 0.005, less than or equal to 100ppm of O, less than or equal to 50ppm of N, less than or equal to 1ppm of H, and the balance of Fe and inevitable impurities.
The action and mechanism of each component of the invention are as follows: alloying elements are important factors affecting weld structure and performance. Along with the change of alloy element components and contents in the welding wire, the structure and the performance of the welding seam are correspondingly changed, and the welding wire has important influence on the strength, the impact toughness and the crack sensitivity of the deposited metal of the welding wire.
Specifically, the C element can obviously improve the strength of the welding seam, the amount of needle-shaped ferrite is increased along with the increase of the content of the C in the high-strength welding seam, the amount of pro-eutectoid ferrite is reduced, the C element ensures that the welding seam metal has certain hardenability, and meanwhile, the embrittlement and cracking tendency of the welding seam can be increased. The content of C in the welding wire is generally controlled within the range of 0.030-0.060 percent of therapeutic content, preferably can be controlled to be lower than 0.06, such as between 0.030-0.055; for example 0.032, 0.034, 0.036, 0.038, 0.040, 0.042, 0.044, 0.046, 0.048, 0.050, 0.052, 0.054 or 0.055.
Mn can inhibit proeutectoid ferrite and promote the formation of acicular ferrite, and proper Mn content can improve the normal temperature toughness of weld metal. The Mn content in the welding wire is generally controlled to be 1.50-1.90 percent by mass, preferably controlled to be lower than 1.60-1.80, such as 1.60, 1.70 or 1.80.
The Si element and the Mn element have interaction in the welding seam, the acicular ferrite in the welding seam increases along with the increase of the silicon content, and the proper proportion of the Si element and the Mn element can improve the metal strength of the welding seam and make up for the strength loss caused by the reduction of the C element. The Si content in the welding wire is generally controlled within the range of 0.20-0.50 percent by mass, and the preferable Si content can be controlled to be lower than 0.04, such as between 0.03 and 0.04, such as 0.032, 0.034, 0.036, 0.038 or 0.040.
The increased Mo element content can inhibit proeutectoid ferrite and promote the formation of acicular ferrite structure, and the addition of proper Mo element can improve the toughness of welding seam and raise the strength of welding seam. The content of Mo element in the welding wire is generally controlled within the range of 0.20-0.60 percent by mass, and the content of Mo element can be controlled preferably between 0.30-0.55, such as 0.30, 0.32, 0.34, 0.36, 0.38, 0.40, 0.42, 0.44, 0.46, 0.48, 0.50, 0.52 or 0.54.
In the weld containing Mn, the Ni element can improve the weld strength and the toughness is improved more obviously. Ni is particularly advantageous for low temperature impact toughness, however Ni is a relatively expensive metal, in consideration of economy and compatibility with low temperature toughness. In the prior art, the purposes of high strength, high toughness and low cost are generally achieved by reducing the Ni content and properly increasing the Cu content. The strength is ensured by utilizing the precipitation strengthening effect of the Cu element, but the precipitation strengthening effect is not obvious when the Cu content is small, and the weld joint is easy to generate hot cracks when the Cu content is large. The low-temperature toughness of the weld metal can be obviously improved by controlling the Mn element and the Ni element within the proper proportion range defined by the application instead of adopting the Cu element. The content of Mn element in the welding wire is generally controlled within the range of 1.50-1.90 percent by mass, and the content of Mn element can be controlled between 1.60-1.80, such as 1.60, 1.70 or 1.80. The Ni element content in the welding wire is generally controlled within the range of 1.50-2.20 percent by mass, and the preferable Ni element content can be controlled between 1.70-2.20, such as 1.70, 1.80, 1.90, 2.00, 2.10 or 2.20.
Ti is used as a microalloying element, is beneficial to promoting the formation of acicular ferrite structure and has beneficial effect on the strength and toughness of a welding seam. The Ti content in the welding wire is generally controlled within the range of 0.050-0.10 percent by mass, and the preferable Ti content can be controlled between 0.050-0.090, such as 0.050, 0.060, 0.070, 0.080 or 0.090.
S and P are main impurity elements, the toughness of the steel is reduced due to the existence of the S, cracks are easy to generate during welding, the plasticity and the toughness of the steel are obviously reduced due to the P element, and the contents of the S element and the P element are strictly controlled.
The method obviously reduces the crack sensitivity of the welding line by reducing the content of C in the welding wire; controlling the content of Mn and Mo elements to improve the strength of the welding seam; controlling the contents of Mo, Ni and Ti elements to improve the strength and low-temperature toughness of the welding seam; the process performance of the welding wire is improved by controlling the contents of Si and Mn; the content of harmful impurity elements such as S, P is strict, and the toughness and plasticity of the welding seam are improved.
In another embodiment, the present invention provides a gas-shielded welding wire, wherein the mechanical properties of the deposited metal of the welding wire in a welding state are as follows: the yield strength is 600-650MPa, the tensile strength is 680-730MP, and the impact energy is 60-95J at-60 ℃.
The gas shielded welding wire is characterized in that:
(1) the welding wire of the invention contains less alloy elements, and does not need to add rare earth elements or Cu and B elements;
(2) the alloy system of the invention takes the optimal content range of a low-carbon Mn-Ni-Mo system as a core, and adds Si and Ti with proper proportion, so that the alloy system has a proper gold system;
(3) the invention has low content of noble metal elements (such as Ni) and good economical efficiency;
(4) the welding wire can realize non-preheating or low-temperature preheating welding;
(5) the welding wire has good low-temperature toughness and crack resistance; the mechanical properties of deposited metal of the welding wire in a welding state are as follows: the yield strength is 600-650MPa, the tensile strength is 680-730MP, and the impact energy is 60-95J at-60 ℃.
(6) The welding wire has stable quality, and when the mixed gas shielded welding is adopted, the welding crack sensitivity test result shows that the fracture surface crack rate is 0% when the welding preheating temperature is 50 ℃.
In one embodiment, the present invention provides a method of welding with a gas shielded welding wire that is not preheated prior to welding.
In another embodiment, the invention provides a method of welding with a gas shielded welding wire that is pre-heated to a temperature of 50 ℃ to 100 ℃ prior to welding.
In one embodiment, the invention provides a method for welding by using a gas shielded welding wire, wherein the welding wire is used for mixed gas shielded welding, and the shielding atmosphere is mixed gas containing 80% or more of inert gas in volume ratio. Optionally, the mixed gas further contains O2Or CO2(ii) a Optionally, the mixed gas contains 98% Ar + 2% O2Or 80% Ar + 20% CO2。
In one embodiment, the invention provides a method for welding with a gas shielded welding wire, the welding process parameters being: the welding current is 260-290A, the welding voltage is 27-32V, the welding speed is 25-27cm/min, the gas flow is 15-20L/min, and the welding line energy is 15-18 KJ/cm.
In one embodiment, the invention provides the use of the gas-shielded welding wire for a low alloy, high strength steel having a tensile strength grade of 690 MPa. Can be widely used for welding large-scale low-alloy high-strength steel such as engineering machinery, railway bridges and the like.
The method of the invention has the following advantages: the alloy with a proper system is adopted to be welded in the atmosphere of mixed gas containing 80 percent or more of inert gas by volume ratio, preheating is not carried out or only carried out at low temperature, and heat treatment is not needed after welding; the welding process is simple, and the performance of a welding joint is improved; reducing production cost and improving working environment. The alloy system used by the welding wire is proper, the processes of wire rod smelting, rolling and welding wire drawing are synchronous with the prior art, and the large-scale production is easy to realize.
In another embodiment, the invention providesA weld deposit metal is provided which is obtained by welding with the gas shielded welding wire according to the present invention. The weld deposit metal obtained by the method of the invention adopts mixed gas (98% Ar + 2% O)2) When in shielded welding, the yield strength of the welding seam deposited metal is 600-. The weld deposit metal of the present invention has excellent low temperature impact toughness and low crack sensitivity. The welding crack sensitivity test result shows that the fracture surface crack rate is 0% when the welding preheating temperature is 50 ℃ or room temperature preheating (namely, no preheating condition).
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a weld metal structure of a welding wire obtained in example 1 of the present invention, which is a small amount of pro-eutectoid ferrite + bainite + acicular ferrite structure, at 400X magnification;
FIG. 2 is a sample dissected in the experimental investigation of the iron grinding of example 1, and the crack generation of the weld joint is determined by the inclined Y groove restraint crack sensitivity test using HQ785T1 steel with the thickness of 28mm, wherein the weld is preheated to 50 ℃ and the surface crack rate and the section crack rate are both 0%.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a0.2 ton electric furnace is adopted, and S, P steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.04, Si: 0.35, Mn: 1.74, Ni: 1.88, Mo: 0.34, Ti: 0.08, S: 0.006, P: 0.0048, O: 80ppm, N: 27 ppm; h: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (80% Ar + 20% CO)2) Welding is carried out in a protection mode, and the welding process comprises the following steps: the welding current is 260A, the welding voltage is 26V, the welding speed is 27cm/min, the gas flow is 20L/min, and the welding line energy is 16.2 KJ/cm. The resulting welded metal structure of the welding wire is shown in fig. 1.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝650MPa，Rm710MPa, 22% of A, 69.5% of Z, and impact absorption power KV of deposited metal at-60 deg.C2It was 74.2J.
Detecting the fracture surface crack rate by a grinding iron test:
sample preparation:
the iron grinding test uses HQ785T1 steel of 28mm thickness, the test pieces are assembled and containment welds are applied to both sides of the test piece in the conventional manner as given in the GB/T32260.2-2015 standard. And detecting and dissecting cracks of the welded test piece after 48 hours.
And (3) crack detection:
after the test piece is welded, knocking off welding slag, cutting the test welding line into 6 pieces with the same width by using a disc milling cutter, visually checking through (1), and calculating the crack rate; or (2) metallographic dissection: and observing cracks of the weld metal and the heat affected zone on the section by using a microscope with the magnification of more than 50 times. The uncracked specimens were confirmed by observation with a microscope of appropriate magnification (at least 200 times).
The test result of the welding crack sensitivity of the inclined Y groove of HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 0% when the welding preheating temperature is 50 ℃. As shown in fig. 2.
Example 2:
a0.5-ton electric furnace is adopted, and S, P-low steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.053, Si: 0.31, Mn: 1.64, Ni: 2.13, Mo: 0.52, Ti: 0.059, S: 0.005, P: 0.0028, O: 65ppm, N: 30ppm, H: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (98% Ar + 2% O)2) Welding is carried out in a protection mode, and the welding process comprises the following steps: the welding current is 260A, the welding voltage is 28V, the welding speed is 27cm/min, the gas flow is 20L/min, and the welding line energy is 16.2 KJ/cm.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝630MPa，Rm690MPa, 22.5% of A and 73.0% of Z, and impact absorption power KV of deposited metal at-60 deg.C2It was 94.2J.
The fracture crack rate was determined by conducting the iron grinding test as described in example 1:
the test result of the welding crack sensitivity of the inclined Y groove of HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 0% when the welding preheating temperature is 50 ℃.
Example 3
A0.2 ton electric furnace is adopted, and S, P steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.04, Si: 0.35, Mn: 1.68, Ni: 1.65, Mo: 0.32, Ti: 0.05, S: 0.006, P: 0.0048, O: 80ppm, N: 27 ppm; h: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (80% Ar + 20% CO)2) Welding is carried out in a protection mode, and the welding process comprises the following steps: welding current 260A, welding voltage 28V, welding speed 26cm/min, gas flow 18L/min, weldingThe linear energy was 16.8 KJ/cm.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝600MPa，Rm680MPa, 22% of A, 73.0% of Z, and impact absorption power KV of deposited metal at-60 DEG C2Is 60J.
The fracture crack rate was determined by conducting the iron grinding test as described in example 1:
the test result of the welding crack sensitivity of the inclined Y groove of the HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 0% when the welding preheating temperature is room temperature (namely under the condition of no preheating).
Example 4
A0.6-ton electric furnace is adopted, and S, P-low steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.55, Si: 0.50, Mn: 1.80, Ni: 2.20, Mo: 0.50, Ti: 0.10, S: 0.006, P: 0.0048, O: 80ppm, N: 27 ppm; h: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (80% Ar + 20% CO)2) Welding is carried out in a protection mode, and the welding process comprises the following steps: the welding current is 280A, the welding voltage is 31V, the welding speed is 27cm/min, the gas flow is 20L/min, and the welding line energy is 19.3 KJ/cm.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝650MPa，Rm730MPa, 19% of A and 73.0% of Z, and the impact absorption power KV of deposited metal at-60 deg.C2Is 80J.
The fracture crack rate was determined by conducting the iron grinding test as described in example 1:
the test result of the welding crack sensitivity of the inclined Y groove of the HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 0% when the welding preheating temperature is room temperature (namely under the condition of no preheating).
Comparative example 1
A0.2 ton electric furnace is adopted, and S, P steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.04, Si: 0.35, Mn: 2.2, Ni: 1.92, Mo: 0.34, Ti: 0.08, S: 0.006, P: 0.0048, O: 80ppm, N: 27 ppm; h: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (80% Ar + 20% CO)2) Welding is carried out in a protection mode, and the welding process comprises the following steps: the welding current is 260A, the welding voltage is 28V, the welding speed is 27cm/min, the gas flow is 20L/min, and the welding line energy is 16.2 KJ/cm. The resulting welded metal structure of the welding wire is shown in fig. 1.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝600MPa，Rm650MPa, 18% of A, 62.3% of Z, impact absorption power KV at-60 deg.C of deposited metal2Is 56J.
The fracture crack rate was determined by conducting the iron grinding test as described in example 1:
the test result of the welding crack sensitivity of the inclined Y groove of HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 20% when the welding preheating temperature is 50 ℃.
Comparative example 2
A0.2 ton electric furnace is adopted, and S, P steel is selected for smelting the welding wire steel.
The chemical components (by mass percent) of the welding wire steel are as follows: c: 0.09, Si: 0.35, Mn: 1.68, Ni: 0.09, Mo: 0.32, Ti: 0.05, S: 0.006, P: 0.0048, O: 80ppm, N: 27 ppm; h: 1ppm, and the balance of Fe and inevitable impurity elements.
After smelting, the welding wire steel is processed into welding wires with the specification of phi 1.2mm by the same processes of rolling, drawing and the like as the common welding wire processing.
The welding wire adopts mixed gas (80% Ar + 20% CO)2) Welding and welding process under protectionComprises the following steps: the welding current is 260A, the welding voltage is 28V, the welding speed is 26cm/min, the gas flow is 18L/min, and the welding line energy is 16.8 KJ/cm.
The thickness of the deposited metal welding plate is 20mm, the bevel angle is 45 degrees, a backing plate with 10mm is arranged, and the root gap is 12 mm. The deposited metal has the mechanical properties that: rel＝660MPa，Rm720MPa, 17% of A, 59.2% of Z, impact absorption power KV of deposited metal at-60 deg.C2Was 43J.
The fracture crack rate was determined by conducting the iron grinding test as described in example 1:
the test result of the welding crack sensitivity of the inclined Y groove of the HQ785T1 steel with the thickness of 28mm shows that the fracture surface crack rate is 100% when the welding preheating temperature is room temperature (namely under the condition of no preheating).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The gas shielded welding wire is characterized by comprising the following chemical components in percentage by mass: c: 0.030 to 0.060, Si: 0.20 to 0.50, Mn: 1.50 to 1.90, Ni: 1.50 to 2.20, Mo: 0.20 to 0.60, Ti: 0.050 to 0.10, S: less than or equal to 0.010, P: less than or equal to 0.005, less than or equal to 100ppm of O, less than or equal to 50ppm of N, less than or equal to 1ppm of H, and the balance of Fe and inevitable impurities.
2. The gas-shielded welding wire according to claim 1, wherein the welding wire comprises the following chemical components in percentage by mass: c: 0.030-0.055, Si: 0.30-0.40, Mn: 1.60-1.80, Ni: 1.70-2.20, Mo: 0.30 to 0.55, Ti: 0.050 to 0.090, S: less than or equal to 0.010, P: less than or equal to 0.005, less than or equal to 100ppm of O and less than or equal to 50ppm of N; h is less than or equal to 1ppm, and the balance is Fe and inevitable impurities.
3. The gas-shielded welding wire according to any one of claims 1 to 2, wherein the mechanical properties of the deposited metal of the welding wire in an as-welded state are: the yield strength is 600-650MPa, the tensile strength is 680-730MP, and the impact energy is 60-95J at-60 ℃.
4. A method of welding with the gas-shielded welding wire of any one of claims 1-2, wherein the wire is not preheated prior to welding.
5. The method of claim 4, wherein the pre-heating temperature of the welding wire prior to welding is 50 ℃; optionally, the preheating temperature is 50 ℃ to 100 ℃.
6. The method as claimed in claim 4, wherein the welding wire is used for gas shielded welding, and the protective atmosphere is a mixed gas containing 80% or more by volume of an inert gas.
7. The method of claim 6, wherein the mixed gas further comprises O2Or CO2(ii) a Optionally, the mixed gas is 98% Ar + 2% O2Or 80% Ar + 20% CO2。
8. Method according to any of claims 4-7, characterized in that the welding process parameters are: the welding current is 260-290A, the welding voltage is 27-32V, the welding speed is 25-27cm/min, the gas flow is 15-20L/min, and the welding line energy is 15-18 kJ/cm.
9. Use of a gas-shielded welding wire according to any one of claims 1 to 3, characterized in that the wire is used for low-alloy, high-strength steel with a tensile strength grade of 690 MPa.
10. A weld deposit metal obtained by welding with the gas-shielded welding wire according to any one of claims 1 to 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112692464A (en) * | 2020-12-16 | 2021-04-23 | 哈焊所华通（常州）焊业股份有限公司 | Corrosion-resistant high-strength welding material for E690 steel for ocean engineering |
| CN113828963A (en) * | 2021-10-21 | 2021-12-24 | 哈尔滨威尔焊接有限责任公司 | Low-yield-ratio anti-seismic high-toughness corrosion-resistant gas shielded welding wire for building structure and application thereof |
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| CN108857141A (en) * | 2018-08-07 | 2018-11-23 | 鞍钢股份有限公司 | It is a kind of 620MPa grades can stress-removal processing gas shield welding wire |
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| JPS5217346A (en) * | 1975-07-31 | 1977-02-09 | Nippon Steel Corp | Mig wire for use in large heat input welding |
| SU1169797A1 (en) * | 1984-04-18 | 1985-07-30 | Предприятие П/Я А-7832 | Welding wire composition |
| CN1939647A (en) * | 2005-09-30 | 2007-04-04 | 中国船舶重工集团公司第七二五研究所 | High-strength and high-toughness gas protective welding wire containing copper |
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| CN101913035A (en) * | 2010-08-23 | 2010-12-15 | 山东索力得焊材有限公司 | High-tenacity gas shielded welding wire for welding low-temperature steel and using method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112692464A (en) * | 2020-12-16 | 2021-04-23 | 哈焊所华通（常州）焊业股份有限公司 | Corrosion-resistant high-strength welding material for E690 steel for ocean engineering |
| CN113828963A (en) * | 2021-10-21 | 2021-12-24 | 哈尔滨威尔焊接有限责任公司 | Low-yield-ratio anti-seismic high-toughness corrosion-resistant gas shielded welding wire for building structure and application thereof |
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