CN101396774B - Flux-cored wire - Google Patents
Flux-cored wire Download PDFInfo
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- CN101396774B CN101396774B CN2007101341639A CN200710134163A CN101396774B CN 101396774 B CN101396774 B CN 101396774B CN 2007101341639 A CN2007101341639 A CN 2007101341639A CN 200710134163 A CN200710134163 A CN 200710134163A CN 101396774 B CN101396774 B CN 101396774B
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- welding
- flux
- medicinal powder
- content
- cored wire
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Abstract
The invention discloses a flux-cored wire, which relates to a flux-cored wire with medicinal powder filled in a soft steel sheath that is specially used for gas shielded arc welding. Each component of the medicinal powder has the following percentages by weight relative to wires: 3.0% to 11.0% of TiO2; 0.02% to 0.10% of C; 0.3% to 1.2% of Si; 0.7% to 2.0% of Mn; 0.1% to 1.5% of Ni; 0.1% to 1.2% of Mo; 0.0010% to 0.0045% of B; 0.05% to 1.00% of the sum of any one or more than two elements of Na, K, Li and Cs; 0.05% to 1.00% of the sum of any one or more than two elements of Mg, Ca, Ba, Al and Zr; balance iron powder and irremovable impurities, and the composition of each element satisfies the conditional expression that C+Si/25+Mn/5+Ni/40+Mo/5 is greater than or equal to 0.25 and is less than or equal to 0.60; the electric arc welding for gas shielding at the conditions that the maximum welding heat is 60KJ/cm and the maximum interlayer-temperature is 350 DEG C has excellent welding operation, fine welding metal intensity of tension and impact ductility.
Description
Technical field
The present invention relates to a kind of gas shielded arc welding and connect flux-cored wire.
Background technology
Recently, some variations have taken place in the steel that are used for steel construction, bridge and building field.In the past, mainly use mild steel, tensile strength steel at 490Mpa, but recently strengthening vibration strength and steel lightweight, thereby thrifty cost is a purpose, tensile strength sharply increases in the steel demand of 520Mpa;
But, meet these demands and on-the-spot special welding surroundings, and the exploitation of satisfying the flux-cored wire of temperature conditions between high heat input high level almost is in space state;
As the steel welding material of tensile strength at 520Mpa, Korea S openly speciallys permit and has put down in writing control C, S, Mn, S, Ti, Mo, Cu, Mn and Mo content sum for 2006-0050038 number; Si and Ti content sum; And the gas shielded arc welding of S and O content sum connects solid core welding wire;
But strictly speaking, the gas shielded arc welding that proposes in the open special permission connects solid core welding wire and can only be applicable to the preferential scope of maximum weld heat at 40KJ/cm, and can only weld the steel of tensile strength below 520Mpa, and compared with flux-cored wire, the operation of solid core welding wire is low, thereby the usage rate in market reduces day by day;
Flux-cored wire meets between the high heat input high level of on-the-spot welding condition and can weld under the temperature, and has excellent operation and mechanical performance, and its exploitation more and more necessary increases, but also nobody proposes concrete scheme.
Summary of the invention
In order to overcome above-mentioned defective; the invention provides a kind of gas shielded arc welding that can under the highest 350 ℃ condition of maximum weld heat 60KJ/cm, interlayer temperature, weld and connect flux-cored wire, to obtain weld job excellence, the outstanding weld metal of mechanical performance.
The present invention for the technical scheme that solves its technical problem and adopt is: a kind of flux-cored wire, comprise mild steel crust and medicinal powder, medicinal powder is filled in the mild steel crust, and the filling rate of medicinal powder is 15～20%, the percentage by weight of the relative welding wire of medicinal powder composition (welding wire is made up of medicinal powder and mild steel crust) is
TiO
2：3.0～11.0％；
C：0.02～0.10％；
Si：0.3～1.2％；
Mn：0.7～2.0％；
Ni：0.1～1.5％；
Mo：0.1～1.2％；
B：0.0010～0.0045；
Any one or two or more composition sum among Na, K, Li and the Cs: 0.05～0.75%;
Any one or two or more composition sum among Mg, Ca, Ba, Al and the Zr: 0.05～1.00%;
With the surplus material be iron powder and impurity that can't Ex-all, each composition is formed the condition that satisfies following conditional: 0.25≤C+Si/25+Mn/5+Ni/40+Mo/5≤0.60.
Below be to explanation of the present invention:
Researchers of the present invention are in order to develop temperature (maximum weld heat 60KJ/cm between high heat input, high level; 350 ℃ of interlayer temperatures) have excellent weld job under the condition and outstanding mechanical gas shielded arc welding connects welding wire, study repeatedly and test.Found that, filling rate is in 15～20% the flux-cored wire, if control the content of specific medicinal powder composition element in right amount, can avoid the drawback that incidental weld job is low and the weld metal mechanicalness reduces under temperature between high heat input weldering and high level, promptly, can avoid bad phenomenon such as reduction of tensile strength and resistance to impact and heat cracking, so proposed the present invention.
Next specify the medicinal powder composition that constitutes welding wire in the present invention and the problems such as restriction reason of content thereof.
TiO
2: 3.0～11.0% (following all be weight percentage)
Among the present invention, TiO
2Be that main welding slag forms agent, in welding process, play the effect of avoiding the molten bath to be subjected to atmospheric effect.Here, should be with TiO
2Content be controlled at 3.0～11.0%, this is the percentage by weight to welding wire.If content is lower than 3.0%; can be because of the shortage of welding slag amount; cause the electric arc instability; the weld metal that can't adequately protect is not subjected to the influence of atmosphere; if and surpass 11.0%; can make not only that welding slag is mobile to be reduced, and the part welding slag can sneak into the inside of weld metal, have a strong impact on the mechanical performance of welding position.
C：0.02～0.10％
The effect of C is the intensity that keeps weld metal, suppresses oxidized byproduct (MnS, Al
2O
3, SiO
2) infiltrate weld metal inside, ensure the quality of welding position.And, can also increase electric arc, welding slag is fused into from branch, avoid the drawback of insufficient (incomplete) penetration.In the present invention, the content of C will be controlled at 0.02～0.10%.Because if the content of C is lower than 0.02%, the toughness of arc stability and weld metal can reduce, and might cause the insufficient (incomplete) penetration phenomenon, if but surpass 0.10%, can be strong excessively because of electric arc, cause arc stability to reduce, and the high temperature resistance crack resistance is descended.
Si：0.3～1.2％
Si is a deoxidier, and effect is the oxygen content that reduces in the deposited metal, and increases the viscosity of welding slag, improves the flowability of deposited metal.
In the present invention, the addition of Si will be controlled at 0.3～1.2%.Reason is, if its content is lower than 0.3%, can be not thorough because of deoxidation, reduce the toughness of weld metal, and if surpass 1.2%, can reduce the flowability of welding slag because of generating too much welding slag, and may cause the toughness of weld metal also to decrease.
Mn：0.7～2.0％
Mn is deoxidier and desulfurizing agent, can chemical reaction take place with S, generates MnS, thereby prevents to generate FeS, by separating S, can suppress the generation of low-melting compound and the generation of hot cracking phenomenon.In the present invention, the content of Mn should be controlled at 0.7～2.0%.Because, if the content of Mn is lower than 0.7%, the intensity of weld metal and toughness are descended, if but surpass 2.0%, can make electric arc become unstable, reduce meltbility, and the possibility of generation hot cracking phenomenon can increase also.
Ni：0.1～1.5％，Mo：0.1～1.2％
The effect of Ni and Mo is to make the weld metal tissue become stable in the welding under the temperature conditions between high heat input weldering and high level, ensures the toughness and the intensity of weld metal.In the present invention, the content of Ni should be controlled at 0.1～1.5%.Because if the content of Ni is lower than 0.1%, the impact flexibility of weld metal can reduce, and if, hot cracking might take place above 1.5%.
In addition, the content of Mo should be controlled at 0.1～1.2%.Because if its content is lower than 0.1%, the tensile strength of weld metal can reduce, and if surpass 1.2%, can too increase because of tensile strength, might cause hot cracking.
B：0.0010～0.0045％
The effect of B is the generation that suppresses iron particle, uses the weld structure granular, thereby realizes the intensity of welding position and stablizing of toughness.In the present invention, the content of B should be controlled at 0.0010～0.0045%.Because, if its content can't play expected effect not as good as 0.0010%, and if, might cause hot cracking above 0.0045%.
The content of one or two or more kinds material composition sum of selecting in the combination by Na, K, Li and Cs is 0.05～0.75%.
These compositions are arc stabilizers, and effect is to reduce the generating capacity that splashes, the moving of stable arc.The total content of above-mentioned composition should be controlled at 0.05～0.75%.Because, if be lower than 0.05%, can't realize the stability of electric arc, and splash phenomena can a large amount of take place, and if surpass 0.75%, can cause the electric arc instability, hinder the flowability of welding slag, make the welding bead outward appearance become unbalanced.
The content of one or two or more kinds material composition sum of selecting in the combination by Mg, Ca, Ba, Al and Zr is 0.05～1.00%.
These compositions are deoxidiers, and effect is the oxygen of eliminating in the weld metal.The total content of above-mentioned composition should be controlled at 0.05～1.00%.Because, if be lower than 0.05%, can be not thorough because of deoxidation, cause weld metal toughness to reduce, if but surpass 1.00%, excessive the splashing of meeting reduced weld job, and weakens the high temperature resistance cracking.
0.25≤C+Si/25+Mn/5+Ni/40+Mo/5≤0.60
Among the present invention, should be by the conditional value that C+Si/25+Mn/5+Ni/40+Mo/5 forms 0.25～0.60.Because in the temperature environment, from the characteristics of welding, hot cracking takes place in the sclerosis because of the welding position easily, and reduces the tensile strength and the impact flexibility of welding position between electroslag welding, high level.Therefore, consider the sclerosis possibility of above-mentioned each element, need limit its value.When tension conditional value was between 0.25～0.60, the mechanical performance of high temperature resistance cracking and weld metal was had a mind to very much, if but be lower than 0.25, can reduce the hot strength and the impact flexibility of weld metal, if and, can be prone to hot cracking because of the hardness increase of welding position above 0.60.
Among the present invention, comprise iron composition and impurity that can't Ex-all in other medicinal powder.The effect of iron composition is to form medicinal powder filling welding wire, forms weld metal during welding, and impurity that can't Ex-all has P, S etc., and these materials are the impurity that contains in the raw material that use as medicinal powder, and content is few, is not painstakingly to add.
The invention has the beneficial effects as follows: in sum, very effective aspect the gas shielded arc welding that the present invention carries out gas shield under the highest 350 ℃ condition of maximum weld heat 60KJ/cm, interlayer temperature arc welding has excellent weld job, good weld metal tensile strength and impact flexibility, a high temperature resistance cracking connects.
The specific embodiment
Next, by example in detail the present invention.
Example:
Gas shielded arc welding according to the 1 content preparation diameter 1.4mm that tabulates down connects the medicinal powder flux-cored wire in advance.At this moment, the medicinal powder pack completeness is 15～20%, and employed medicinal powder composition content is the percentage by weight to the welding wire full weight, and it is recorded in table 2.
[table 1]
* be one or more material sums of in Na, K, Li and Cs, selecting.
Material one or more material sums in Mg, Ca, Ba, Al and Zr, selecting.
* * is C+Si/25+Mn/5+Ni/40+Mo/5
[table 2]
Utilize above-mentioned welding wire, being that the SM520B welding of 25mm is female to thickness just welds, and its concrete welding condition is as shown in table 3.After welding, weld job, mechanicalness and the high temperature resistance cracking of welding wire are estimated respectively, and with outcome record in table 4.At this moment, by be used to estimate to weld job carried out 4 grade separations (
For outstanding, zero is good, and △ be general, * be bad), and that tensile strength is judged to be between 520 ~ 590Mpa the time is qualified, impact flexibility 0 ℃ descend be judged to be when above above 47Joules qualified.In addition, be judged to be when following 1.0% for the ratio of hot cracking incidence (be full of cracks take place length)/(all weld lengths) qualified.At last, carried out general comment after carrying out comprehensively to these evaluation results.Wherein,
For outstanding, zero is good, and △ is general, * be bad.
[table 3]
[table 4]
* A is a weld job, and B is tensile strength (MPa), and C is impact flexibility [vE 0 ℃ (Joules)], and D is be full of cracks incidence (%).
As can be seen from Table 4, utilize the welding wire of example of the present invention (1-5) to carry out high heat input welding, the temperature welding is all demonstrating good result aspect weld job, weld metal tensile strength and impact flexibility, the high temperature resistance cracking between high level.
In contrast, to exceed the situation of the too much comparative example (2) of comparative example (1) that the present invention requires and Mn content be that hot strength is excessive to the content of Si, Mn and Ni, impact flexibility is low excessively, and be full of cracks incidence height, be not suitable for the high heat input, temperature welding between high level.
In addition, the situation that the content of Ni and Mo exceeds the comparative example (3) that the present invention requires is that though weld job is good, tensile strength and impact flexibility are low, be full of cracks incidence height; And the content of Ni and B exceeds the situation of the comparative example (4) that the present invention requires be, not fully up to expectations aspect impact flexibility and high temperature resistance.
In addition, the situation that one or more material sums of selecting in Na, K, Li and Cs exceed the comparative example (5,6) that the present invention requires is that weld job is low.
And one or more material sums of selecting in Mg, Ca, Ba, Al and Zr are lower than the situation of the comparative example (7) that the present invention requires be, impact flexibility and high temperature resistance cracking are not fully up to expectations, and the situation that exceeds the comparative example (8) of claimed range of the present invention is, weld job is low, the high temperature resistance cracking is not fully up to expectations, be not suitable for the input of electric heating amount, temperature welding between high level.
In addition, when the content of Mo exceeded the situation of the comparative example (9) that the present invention requires, tensile strength was excessive, some deficiency of impact flexibility, and the high temperature resistance cracking is also not fully up to expectations; The situation that C+Si/25+Mn/5+Ni/40+Mo/5 conditional value exceeds the comparative example (10-12) of the scope of the invention is, though weld job does not descend, but weld metal tensile strength and impact flexibility, high temperature resistance cracking decline to a great extent, and are not suitable for temperature welding between high heat input high level.
Claims (1)
1. a flux-cored wire comprises mild steel crust and medicinal powder, and medicinal powder is filled in the mild steel crust, it is characterized in that: the filling rate of medicinal powder is 15～20%, and the percentage by weight of the relative welding wire of medicinal powder composition is,
TiO
2：3.0～11.0％；
C：0.02～0.10％；
Si：0.3～1.2％；
Mn：0.7～2.0％；
Ni：0.1～1.5％；
Mo：0.1～1.2％；
B：0.0010～0.0045；
Any one or two or more composition sum among Na, K, Li and the Cs: 0.05～0.75%;
Any one or two or more composition sum among Mg, Ca, Ba, Al and the Zr: 0.05～1.00%;
With the surplus material be iron powder and impurity that can't Ex-all, each composition is formed the condition that satisfies following conditional: 0.25≤C+Si/25+Mn/5+Ni/40+Mo/5≤0.60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101341639A CN101396774B (en) | 2007-09-30 | 2007-09-30 | Flux-cored wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101341639A CN101396774B (en) | 2007-09-30 | 2007-09-30 | Flux-cored wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101396774A CN101396774A (en) | 2009-04-01 |
| CN101396774B true CN101396774B (en) | 2010-12-08 |
Family
ID=40515746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101341639A Expired - Fee Related CN101396774B (en) | 2007-09-30 | 2007-09-30 | Flux-cored wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101396774B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102528332B (en) * | 2010-12-20 | 2015-02-04 | 昆山京群焊材科技有限公司 | High-strength low-temperature-resistant TiO2-series CO2 gas-shielded low-hydrogen type flux-cored wire |
| CN102500953A (en) * | 2011-12-14 | 2012-06-20 | 上海交通大学 | High-strength low-yield-ratio gas shielded welding wire |
| JP6085205B2 (en) * | 2013-03-25 | 2017-02-22 | 株式会社神戸製鋼所 | Flux-cored wire for gas shielded arc welding |
| CN104117789B (en) * | 2014-08-06 | 2016-05-25 | 武汉铁锚焊接材料股份有限公司 | A kind of low-temperature steel flux-cored wire |
| JP6609493B2 (en) * | 2015-07-31 | 2019-11-20 | 株式会社神戸製鋼所 | Electrogas arc welding method and electrogas arc welding apparatus |
| CN106181122B (en) * | 2016-08-10 | 2018-12-25 | 中国船舶重工集团公司第七二五研究所 | A kind of seamless submerged arc flux-cored wire for yield strength 550MPa steel |
| US10668572B2 (en) * | 2016-11-16 | 2020-06-02 | Lincoln Global, Inc. | Welding electrode wires having alkaline earth metals |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840728A (en) * | 2005-03-31 | 2006-10-04 | 株式会社神户制钢所 | Low alloy steel weld metal and flux cored wire |
| CN1962161A (en) * | 2005-11-07 | 2007-05-16 | 株式会社神户制钢所 | Cored wire for gas protective arc welding for high tensile strength steel |
| CN101041213A (en) * | 2007-04-27 | 2007-09-26 | 北京工业大学 | Metal powder core filler metal for welding of high-tensile steel |
-
2007
- 2007-09-30 CN CN2007101341639A patent/CN101396774B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840728A (en) * | 2005-03-31 | 2006-10-04 | 株式会社神户制钢所 | Low alloy steel weld metal and flux cored wire |
| CN1962161A (en) * | 2005-11-07 | 2007-05-16 | 株式会社神户制钢所 | Cored wire for gas protective arc welding for high tensile strength steel |
| CN101041213A (en) * | 2007-04-27 | 2007-09-26 | 北京工业大学 | Metal powder core filler metal for welding of high-tensile steel |
Non-Patent Citations (3)
| Title |
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| JP昭59-64195A 1984.04.12 |
| JP昭62-33094A 1987.02.13 |
| JP特开2005-296999A 2005.10.27 |
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| CN101396774A (en) | 2009-04-01 |
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Granted publication date: 20101208 Termination date: 20160930 |