CN111618478B - Low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding and welding method thereof - Google Patents
Low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding and welding method thereof Download PDFInfo
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- CN111618478B CN111618478B CN201910149989.5A CN201910149989A CN111618478B CN 111618478 B CN111618478 B CN 111618478B CN 201910149989 A CN201910149989 A CN 201910149989A CN 111618478 B CN111618478 B CN 111618478B
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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
- B23K35/3066—Fe as the principal constituent with Ni 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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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
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
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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
Abstract
A low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding and a welding method thereof, the chemical components by mass percent are as follows: c:0.04 to 0.08%, si:0.6 to 1.2%, mn: 0.08-0.2 percent of the total weight of the composition, P <0.02 percent, S <0.01%, ti:0.15 to 0.5%, zr:0.04 to 0.1%, ni: 0.2-0.7%, rare earth silicon iron alloy: 0.3 to 0.7 percent, and the balance of Fe and inevitable impurities; and, the following conditions need to be satisfied at the same time: si/14+ Ti/24= 0.05-0.10, ti/192+ Zr/91= 0.3-0.7C/12, when the Mn content is less than 0.2%, the carbon fixation requirement in the molten pool reaction is relatively reduced. The low-manganese gas shielded welding wire is suitable for ultralow heat input automatic welding of not more than 0.25kJ/mm, can reduce the adverse effects of rapid cooling and hardening tendency of weld metal on weld metal structure and performance under the ultralow heat input automatic welding condition, and improves the comprehensive performance index of a welding joint.
Description
Technical Field
The invention relates to the technical field of gas shielded welding wires, in particular to a low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding and a welding method thereof, and is suitable for ultralow heat input automatic welding of not more than 0.25 kJ/mm.
Background
The gas metal arc automatic welding has the advantages of high welding efficiency, stable welding quality and good operability, and is widely applied in the industry. Particularly in the construction of long-distance petroleum and natural gas pipelines, the advantages of gas metal arc welding are more obvious, so that the gas metal arc welding method becomes the mainstream welding method of the girth welding in the field construction of pipeline pipes. Because the weld metal belongs to a typical non-equilibrium fast solidification columnar crystal structure, the performance can not be improved through a rolling process like a pipe body base metal, and the performance can only be ensured through the adjustment of chemical components, the quality and the performance of a welding joint are determined to a great extent by a welding wire component system matched with the weld metal.
Recently, in many foreign pipeline projects, from the perspective of accelerated failure under severe conditions, a user puts forward the requirements of a pipe supplier for performing consumable electrode gas shielded automatic welding and evaluating the performance of a joint by applying ultra-low heat input not more than 0.25kJ/mm on a steel supply pipe, and the weldability of the steel pipe is judged according to the results. From the perspective of welding process, the general gas shielded automatic welding heat input range of solid wire consumable electrode is 0.5-1.5 kJ/mm, and the ultra-low heat input of 0.25kJ/mm belongs to extremely harsh welding process conditions, which inevitably causes accelerated cooling and serious non-equilibrium solid phase change of weld metal, thereby generating adverse effect on weld metal structure and causing the reduction of comprehensive performance indexes, especially toughness. The deterioration of the weld metal structure and the performance simultaneously leads to the performance reduction of the adjacent fusion area, which influences the correct judgment of the user on the weldability of the steel pipe and even brings great loss to the pipe supplier.
For example, for API 5L X70M pipeline steel pipes, the AWS A5.18 ER70S-G gas shielded solid wire commonly used for low alloy steel is adopted to carry out automatic girth welding under the condition of 0.25kJ/mm ultra-low heat input, and due to the rapid cooling and hardening effect after welding and the rapid reduction of carbon solubility after solid-state phase transformation from austenite to ferrite, the microstructure of weld metal is represented by unevenly distributed strip martensite and a large number of cluster-shaped M-A components, which belong to the structure type capable of causing serious embrittlement. Correspondingly, the toughness index of the weld metal is seriously reduced, and the method is mainly characterized in that: the single value of the impact energy at minus 10 ℃ is even lower than 35J, the CTOD fracture toughness value is generally lower than 0.1mm, and is respectively lower than 0.05mm. If the mainstream automatic girth welding process of pipeline steel pipe field construction is adopted, the impact energy is generally not less than 100J, and the CTOD value is also more than 0.2 mm. In view of the metallurgical characteristics and the particularity of performance control of weld metal, a welding wire special for gas protection suitable for ultra-low heat input automatic welding conditions needs to be developed, the generation of strip martensite in the non-equilibrium rapid cooling process is limited and the number of cluster-shaped M-A components is reduced through the optimization of a chemical composition system, so that the toughness of the weld metal is improved, and the target value is set as follows: the single value of the impact energy at the temperature of minus 10 ℃ is not lower than 50J, and the average value is not lower than 60J.
Currently, there are many patents disclosing welding wires for gas metal arc welding of low alloy steels and steel pipes, such as: the Chinese patent application publication numbers CN101905390 and CN102152025 and the like adopt the steps of adding a small amount of noble elements Cr, ni and Mo, adding a proper amount of Cu, and adopting Ti microalloying to carry out consumable electrode gas shielded welding under the conventional conditions, and the joint strength can reach 900MPa to the maximum, has good impact toughness and has certain economical efficiency. The welding wire has high carbon equivalent by the component design, and a martensite structure doped on a bainite matrix appears in a welding seam and a nearby heat affected zone.
Chinese patent application publication No. CN101288925 discloses a gas shielded solid-core welding wire which is good in crack resistance and good in comprehensive mechanical property of deposited metal, wherein the component system of the welding wire is based on low carbon, proper amounts of Cr, ni, mo and Ti are added, and proper welding process specifications are supplemented, so that consumable electrode gas shielded welding under the conventional welding process conditions of 700 MPa-800 MPa structural steel can be met.
The gas-shielded solid welding wire disclosed in Chinese patent application publication Nos. CN101172322, CN101116930, CN101992365 and the like adopts Ti and B combined micro-alloying on the basis of C-Mn basic elements supplemented with proper amounts of Cr, ni and Mo, and partially adds rare earth metals, so that the welding seam is purified, crystal grain growth is prevented by the inhibiting effect of B and rare earth compounds on grain boundaries, and the comprehensive mechanical property of the welding seam metal is improved.
Chinese patent application publication No. CN101733580 discloses a gas metal arc welding wire for welding high-strength steel, which comprises a component system that Ti-Zr is used for combined micro-alloying on the basis of C-Mn basic elements supplemented with a small amount of Cr, ni and Mo, and acicular ferrite nucleation in weld metal is promoted by high-melting-point particles such as TiO, tiN, zrO and the like, so that the purposes of refining grains and improving comprehensive mechanical properties of the weld are achieved.
In summary, the commercial gas shielded welding wire disclosed at present is based on the commonly used gas shielded metal welding process, the welding heat input is basically not lower than 0.5kJ/mm, the postweld cooling rate of the weld metal is moderate, and the weld metal structure is not abnormal and severe embrittlement is not caused in the range of the chemical composition system. However, if the welding wire with the above composition system is applied to the ultra-low heat input gas shielded welding which is required by the user of the steel pipe of the overseas pipeline and does not exceed 0.25kJ/mm, the weld metal is seriously embrittled and the impact energy and the CTOD fracture toughness are severely reduced like the common AWS A5.18 ER70S-G gas shielded solid welding wire.
Therefore, the current existing gas shielded welding wire cannot meet the requirement of ultralow heat input gas shielded welding which does not exceed 0.25 kJ/mm.
Disclosure of Invention
The invention aims to design a low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding and a welding method thereof, which are suitable for ultralow heat input automatic welding with the heat input of not more than 0.25kJ/mm, and reduce the adverse effects of the rapid cooling and hardening tendency of weld metal on the structure and the performance of the weld metal under the ultralow heat input automatic welding condition by adopting a low-carbon ultralow-manganese chemical component system to design a welding wire formula and microalloying of a proper amount of other elements, thereby improving the comprehensive performance index of a welding joint.
In order to achieve the purpose, the technical scheme of the invention is as follows:
in consideration of the rapid cooling of the weld metal and the hardening tendency caused by the rapid cooling under the ultralow heat input automatic welding condition of not more than 0.25kJ/mm, the invention adopts the low-carbon ultralow manganese content to design the welding wire formula, and is assisted with the microalloying effect of a proper amount of other elements, thereby avoiding the weld metal from forming unevenly distributed strip martensite and clustered M-A components, and further improving the toughness index of a welding joint; simultaneously combines the effects of various alloy elements on the quenching behavior, the structure transformation and the homogenization in the solid phase transformation.
Specifically, the low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding comprises the following chemical components in percentage by mass:
C：0.04～0.08％
Si：0.6～1.2％
Mn：0.08～0.2％
P：<0.02％
S：<0.01％
Ti：0.15～0.5％
Zr：0.04～0.1％
Ni：0.2～0.7％
rare earth silicon iron alloy (Re + Si > 60%): 0.3 to 0.7 percent
The balance of Fe and other inevitable impurity elements; and the number of the first and second electrodes, the following conditions need to be satisfied simultaneously:
from the perspective of deoxidation of a molten pool, si/14+ Ti/24= 0.05-0.10, when the Mn content is less than 0.2%, the deoxidation effect in the molten pool reaction is ignored;
from the carbon fixing perspective, ti/192+ Zr/91= (0.3-0.7) C/12, and when the Mn content is less than 0.2%, the carbon fixing requirement in the molten pool reaction is relatively reduced.
In the chemical composition design of the gas shielded welding wire, the chemical composition of the gas shielded welding wire is as follows:
c is an important element in low alloy steel, has an important influence on solid-state phase transition and hardening in a cooling process after welding, and is an element which contributes most to carbon equivalent. The welding wire provided by the invention is based on the low cost, the ultra-fast cooling hardening caused by carbon equivalent and ultra-low heat input is not controlled by a method for deliberately reducing the content of C, the element is formed by adding strong carbide, and a low-oxygen and low-nitrogen molten pool environment is created, so that the decarburization effect is realized to the maximum extent.
Mn and Fe have similar atomic radius and lattice parameters, belong to an infinitely expanded austenite region element in solid-state phase transition, can realize infinite solid solution with Fe, have strong solid solution strengthening effect, have the effect second to C in carbon equivalent calculation, and particularly have very obvious hardening effect on weld metal in the ultra-fast cooling process caused by ultra-low heat input welding. In view of this, the welding wire of the invention adopts the design of ultra-low Mn content, the strengthening effect of Mn on the weld metal is reduced to the lowest under the harsh ultra-low heat input welding condition, thereby achieving the effects of controlling the metal structure of the welding seam and improving the toughness. The deoxidation effect of Mn in the metallurgical reaction of the welding pool is replaced by other elements.
Si mainly plays a role in deoxidation in the welding process, improves the fluidity of a welding pool, and ensures the spreading and good forming of a welding line. The invention adopts the design of high Si content components, thereby balancing the deoxidation effect additionally required by low Mn content. The high Si content is also one of the important characteristics of the invention, and is established on the basis of ultralow heat input automatic welding and low Mn content, and the low Mn content can enable a large amount of Si to participate in deoxidation reaction, so that the Si can not remain in a free state in weld metal to cause embrittlement; the ultra-low heat input thin layer welding bead of the two is very beneficial to the floating and automatic falling of the silicon oxide skin, and can not cause welding defects. After a large amount of silicon oxide scale is removed, the content of metal Si of the welding seam is correspondingly reduced, and the carbon equivalent and the hardening tendency can not be improved because of originally adding more Si. Under normal welding conditions and in situations where the Mn content is elevated, high Si content will cause severe embrittlement of the weld.
P, S belongs to inevitable harmful impurity elements in the C-Mn steel material, and the excessive content of the harmful impurity elements can generate low-melting-point eutectic substances or brittle inclusions with a plurality of alloy elements to cause weld embrittlement. The invention controls P, S element in proper range, and adds the effect of rare earth element to improve the form of its inclusion, without obvious adverse effect on the weld metal performance under the condition of ultralow heat input automatic welding.
Ti and Zr are strong carbide forming elements, and higher Ti content simultaneously plays a role in nitrogen fixation, and the deoxidation effect of Si is added, so that the low-oxygen and low-nitrogen environment in a welding pool is created, the decarburization effect of Ti and Zr is promoted, the effective C content and carbon equivalent are reduced under the condition of certain initial C content, the hardening tendency caused by ultra-low heat input automatic welding and ultra-fast cooling caused by the ultra-low heat input automatic welding is reduced, a low-carbon bainite (a small amount of low-carbon martensite) structure is formed, the number of M-A components is reduced due to the reduction of solid-solution carbon, and the toughness of weld metal under the condition of ultra-low heat input automatic welding can be improved. Meanwhile, alloy carbide formed by Ti and Zr can be used as a nucleation core during solid phase transformation to refine matrix structure, and is beneficial to the toughness of weld metal.
Ni also belongs to an element that expands the austenite region and can be solid-dissolved indefinitely with Fe, similarly to Mn. However, from the contributions of the various elements in the carbon equivalent calculation, it can be found that: the hardenability tendency of Ni is far lower than that of Mn, and the Ni is a face-centered cubic lattice, has good toughness and is beneficial to the toughness of weld metal in a certain chemical composition range. However, from the economical point of view, ni is not used as an element added in a large amount in the present invention, but a small amount of Ni mainly ensures sufficient homogenization of high-temperature austenite, thereby contributing to homogenization of the final structure and also contributing to ensuring toughness of the weld metal.
The rare earth element added by adding the rare earth ferrosilicon alloy belongs to chemical active substances, can form a rare earth compound with most of non-metal elements, plays a role in purifying a welding seam, can improve the shape of inclusions in welding seam metal, spheroidizes harmful inclusions such as sulfides, is also beneficial to homogenizing large block-shaped and cluster-shaped M-A components after welding, and is very beneficial to improving the toughness of the welding seam metal. Si in the reaction can also participate in the deoxidation reaction. In addition, the rare earth ferrosilicon alloy is added into the welding wire, so that the burning loss of active rare earth elements in the smelting process can be avoided, and the beneficial effect of the rare earth ferrosilicon alloy can be fully exerted in the subsequent welding metallurgy.
The chemical elements of the gas shielded solid welding wire have independent functions, but more importantly: from the perspective of molten pool deoxidation, carbon fixation and weld structure homogenization, each main chemical element has a definite correlation and matches with the quantity range, and each main chemical element is not isolated.
First, mn to carbon equivalent (C) eq ) The contribution of the method is only second to C and the serious solid solution strengthening effect of the C, and a low-carbon ultralow-manganese chemical composition system is adopted, so that the carbon equivalent (C) is effectively reduced eq ) And the severe hardening tendency in the ultra-fast cooling process caused by ultra-low heat input welding reduces the martensite content in the weld metal, thereby reducing the strength and the hardness of the weld metal and being beneficial to ensuring the toughness index. Meanwhile, when the content of Mn is lower than 0.2%, si is mainly adopted and Ti is used for bath deoxidation, so that the oxidation of other beneficial alloy elements is avoided and the purity of weld metal is ensured, a thin layer weld bead formed under the condition of ultralow heat input is also beneficial to the floating and removal of silicon oxide skin, and weld embrittlement caused by overhigh content of Si is avoided. Proper amount of Ti and Zr is added to form the composite carbonitride in a low-oxygen and low-nitrogen environment, so that the composite carbonitride can be used as ferrite nucleation core refined grains in solid phase change after welding, the effective carbon content and carbon equivalent of weld metal are reduced, and the composite carbonitride is very effective for reducing the rapid cooling hardening tendency after ultra-low heat input welding. Ni is not used as a large amount of added elements in the invention, but a small amount of Ni is mainly used for ensuring the sufficient homogenization of high-temperature austenite, thereby being beneficial to the homogenization of a final structure and eliminating the uneven distribution of strip martensite and cluster M-A components in weld metal. By adding rare earth ferrosilicon alloyThe rare earth elements are added, the inclusion shape in the welding seam can be improved, and simultaneously, the grain boundary segregation characteristic of the rare earth alloy is utilized, so that the massive M-A component is homogenized after welding, the fine and uniformly distributed acicular ferrite and bainite tissues are formed, and the improvement of the metal toughness of the welding seam is facilitated.
The gas shielded solid welding wire is suitable for ultralow heat input automatic welding occasions with the yield strength not more than 630MPa and the tensile strength not more than 700MPa or low-alloy high-strength steel not more than 0.25kJ/mm, and under the extremely harsh heat input condition, the chemical component system of the welding wire can furthest prevent weld metal from generating a large amount of strip-shaped high-carbon martensite structures and cluster-shaped M-A components and form acicular ferrite and strip-shaped bainite structures which are relatively uniformly distributed, can ensure the toughness indexes of the weld metal and a fusion area, and is very favorable for improving the comprehensive performance of joints under the extremely harsh welding condition. However, if conventional welding heat input conditions are employed, the solid wire weld of the present invention may exhibit too low a strength or embrittlement due to too high a Si content.
In addition, the solid welding wire adopts a low Mn and high Si design, and the oxidizing gas component in the protective atmosphere is not too high in order to ensure the deoxidation effect. In order to ensure the stability of the welding arc and the uniformity of the energy distribution, an appropriate amount of oxidizing gas needs to be added.
In view of the above, the welding wire welding method of the present invention is applicable to actual welding operations with the following volume percentage ranges of the shielding gas components: ar:80% -90%; CO 2 2 ：10％～20％；O 2 ：0％～5％。
If the active ingredients of the protective gas are too high, the deoxidation effect of the welding pool is not good, the decarburization effect of Ti and Zr microalloy elements is difficult to be exerted, the microstructure and the metal performance of a welding seam after welding are both adversely affected, particularly the metal embrittlement of the welding seam is generated, welding spatter is increased, and the attractiveness of the welding seam is affected. If the Ar content in the protective gas is too high, the energy density of the electric arc is highly concentrated in the ultra-low heat input rapid welding process, the weld bead spreadability is deteriorated, weld defects such as undercut and poor edge fusion are formed, and local burn-through may be caused, making it difficult to form the entire weld bead.
The invention has the beneficial effects that:
according to the invention, through the design of low-carbon ultralow-manganese high-silicon-content chemical components, the combined decarbonization effect of Ti and Zr in a low-oxygen low-nitrogen molten pool environment and the ferrite nucleation promotion effect of alloy carbides, the strong hardening tendency of weld metal caused by ultralow heat input welding is effectively reduced, and the homogenization effect of a proper amount of Ni and rare earth alloy tissues is added, so that a large amount of strip martensite and high-carbon cluster M-A components are avoided in the weld metal, and the toughness of a welding joint under the extreme harsh condition of ultralow heat input automatic welding is improved. The gas shielded solid welding wire is suitable for low alloy steel or low alloy high-strength steel with yield strength not more than 630MPa and tensile strength not more than 700MPa.
Compared with the existing low-alloy steel gas shielded solid welding wire product, the low-manganese gas shielded solid welding wire suitable for ultralow heat input automatic welding with the heat input of not more than 0.25kJ/mm has the following advantages:
1) Under the condition of ultralow heat input automatic welding of not more than 0.25kJ/mm, the uneven distribution of strip martensite and high-carbon cluster M-A components in weld metal is avoided, the microstructure mainly comprises relatively uniform and fine acicular ferrite and bainite, and the low-temperature impact toughness of the weld metal is obviously improved. Compared with the prior art, the method realizes technical breakthrough;
2) The welding wire has simple chemical component design and high cost performance, does not intentionally add too much precious alloy components, fully utilizes the effective interaction of common alloy elements in different component ranges, exerts respective advantages and realizes reasonable matching under the ultra-low heat input welding condition;
3) The design of the chemical components with ultralow manganese content and the combined decarburization effect of Ti and Zr reduces the effective carbon equivalent, even if the ultralow heat input automatic welding of not more than 0.25kJ/mm is carried out under the condition of no preheating, no cold crack occurs, and the operability is good.
The invention adopts the common alloy element design of the gas shielded welding wire, does not add a large amount of noble alloy components, but fully utilizes the interaction of a certain range of alloy components in a specific environment, and meets the requirement of ultralow heat input automatic welding under severe conditions. Compared with the prior art, the invention realizes technical breakthrough in the new application field.
Detailed Description
The present invention will be further described with reference to the following examples.
The components of the gas shielded solid welding wire disclosed by the invention are shown in table 1, and the table 1 shows 5 different chemical component proportions of the gas shielded welding wire suitable for ultralow heat input welding.
API 5L X70M pipeline steel pipes with the wall thickness of 23mm are selected, and the gas shielded solid welding wire is applied to ultralow heat input automatic welding which is not more than 0.25 kJ/mm. The steel pipe adopts a composite V-shaped groove. The angle of the upper groove is 5 +/-2 degrees, and the depth is 17mm. The lower bevel angle is 30 +/-2 degrees, and the depth is 5mm. The truncated edge of the groove is 1 + -0.5 mm. And the back of the backing weld joint is formed by using a copper gasket in the welding process. Using 80% of Ar +20% of CO 2 And (5) protecting the mixed gas. Before welding, the welding groove and the two sides of the welding groove are required to be polished within 20mm, visible oil stains, rust and the like on the surface are removed, and welding defects are avoided. No preheating treatment is performed before welding.
Table 2 shows the weld joint performance of 5 different composition gas shielded solid wire example weld joints designed under ultra low heat input automatic welding conditions.
Under the condition of ultralow heat input automatic welding of no more than 0.25kJ/mm, by applying the gas shielded welding wire of 5 different embodiments of the invention, acicular ferrite and bainite tissues which are distributed uniformly can be obtained in weld metal, nonuniform martensite and cluster-shaped M-A components which are seriously embrittled are basically eliminated, the obtained weld strength indexes are all good, but the comprehensive mechanical property of the weld metal in the embodiment 3 is more stable through the evaluation of plasticity and toughness indexes.
The gas shielded welding wire is the same as the preparation process in the prior art, the materials are firstly mixed according to the alloy proportioning requirement, then the vacuum electric furnace smelting is carried out, and the solidified steel ingot is rolled, drawn and wound in layers according to the specification requirement of the welding wire. In order to avoid surface oxidation during the use of the gas shielded solid wire, the wire can be subjected to surface copper plating treatment.
Table 1 units: mass percent of
TABLE 2
The gas shielded solid welding wire is mainly used in occasions with ultra-low heat input automatic welding requirements, particularly automatic girth welding of low-carbon microalloyed pipeline steel pipes, avoids generation of a large amount of martensite and high-carbon-content M-A components under the ultra-fast cooling condition caused by ultra-low heat input, and ensures comprehensive performance, particularly toughness, of welding seams.
The gas shielded solid welding wire is mainly used for ultralow heat input automatic welding of X42-X80 grade pipeline steel pipes of not more than 0.25kJ/mm, and can also be used for ultralow heat input automatic welding of similar steel grades in other industrial fields.
Claims (4)
1. A low-manganese gas shielded welding wire suitable for ultralow heat input automatic welding comprises the following chemical components in percentage by mass:
C：0.04～0.08％
Si：0.6～1.2％
Mn：0.08～0.2％
P：<0.02％
S：<0.01％
Ti：0.15～0.5％
Zr：0.04～0.1％
Ni：0.2～0.7％
rare earth silicon iron alloy: 0.3 to 0.7 percent
The balance of Fe and inevitable impurity elements; and, the following conditions need to be satisfied at the same time:
Si/14+Ti/24＝0.05～0.10；
Ti/192+Zr/91＝(0.3～0.7)C/12；
the welding wire weld metal microstructure main body is acicular ferrite and bainite.
2. The low manganese gas-shielded welding wire for ultralow heat input automatic welding according to claim 1, wherein said Re + Si content in said rare-earth ferrosilicon alloy is >60 mass%.
3. The low manganese gas shielded welding wire suitable for ultralow heat input automatic welding according to claim 1 or 2, wherein said welding wire has a metal yield strength of 540 to 630MPa and a tensile strength of 620 to 700MPa.
4. The welding method of the low manganese gas shielded welding wire suitable for the ultra-low heat input automatic welding as claimed in claim 1 or 2, wherein the volume ratio of the welding shielding gas is: ar:80% -90%; CO 2 2 ：10％～20％；O 2 ：0％～5％。
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| CN101670501A (en) * | 2009-09-25 | 2010-03-17 | 王新虎 | Iron-based abrasion resistant overlaying-welding flux-cored wire |
| JP2015009247A (en) * | 2013-06-27 | 2015-01-19 | 株式会社神戸製鋼所 | Welding solid wire, welding method, and weld metal |
| CN104607819A (en) * | 2014-11-27 | 2015-05-13 | 宝山钢铁股份有限公司 | Ultrahigh strength gas protection welding wire and manufacturing method thereof |
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| US4803340A (en) * | 1986-04-23 | 1989-02-07 | Kawasaki Steel Corp. | Covered arc-welding electrode |
| WO2003064103A1 (en) * | 2002-01-31 | 2003-08-07 | Jfe Steel Corporation | Steel wire for carbon dioxide shielded arc welding and welding process using the same |
| JP4614226B2 (en) * | 2005-04-07 | 2011-01-19 | 株式会社神戸製鋼所 | Solid wire for gas shielded arc welding |
| JP5205115B2 (en) * | 2008-04-16 | 2013-06-05 | 株式会社神戸製鋼所 | MIG flux-cored wire for pure Ar shield gas welding and MIG arc welding method |
| JP5834534B2 (en) * | 2010-06-29 | 2015-12-24 | Ｊｆｅスチール株式会社 | High strength low yield ratio steel with high uniform elongation characteristics, manufacturing method thereof, and high strength low yield ratio welded steel pipe |
| JP6509007B2 (en) * | 2015-03-30 | 2019-05-08 | 株式会社神戸製鋼所 | Method of manufacturing flux-cored wire for gas shielded arc welding |
| JP2016187828A (en) * | 2015-03-30 | 2016-11-04 | 株式会社神戸製鋼所 | Flux-cored wire for gas shield arc welding |
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| CN101670501A (en) * | 2009-09-25 | 2010-03-17 | 王新虎 | Iron-based abrasion resistant overlaying-welding flux-cored wire |
| JP2015009247A (en) * | 2013-06-27 | 2015-01-19 | 株式会社神戸製鋼所 | Welding solid wire, welding method, and weld metal |
| CN104607819A (en) * | 2014-11-27 | 2015-05-13 | 宝山钢铁股份有限公司 | Ultrahigh strength gas protection welding wire and manufacturing method thereof |
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