CN101497154B - Solid wire for carbon-dioxide shield welding - Google Patents

Solid wire for carbon-dioxide shield welding Download PDF

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Publication number
CN101497154B
CN101497154B CN200910001711XA CN200910001711A CN101497154B CN 101497154 B CN101497154 B CN 101497154B CN 200910001711X A CN200910001711X A CN 200910001711XA CN 200910001711 A CN200910001711 A CN 200910001711A CN 101497154 B CN101497154 B CN 101497154B
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quality
welding
slag
mass
welding wire
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CN101497154A (en
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铃木励一
中野利彦
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Kobe Steel Ltd
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Kobe Steel Ltd
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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
    • 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
    • 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
    • B23K35/40—Making wire or rods for soldering or welding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The solid wire for carbon dioxide gas arc welding in the invention comprises 0.03-0.10 mass% of C, 0.67-1.00 mass% of Si, 1.8192.50 mass% of Mn, 0.006-0.018 mass% of S, 0.100-0.150 mass% of Ti, 0.0015-0.0070 mass% of B, 0.10-0.45 mass% of Cu contained by plating component; the PBS and PMT expressed by following formula satisfy PBS being less than or equal to 10, PMT being less than or equal to 32, and 0.020 mass% of P, less than 0.04 mass% of V, less than 0.04 mass% of Al, the rest being Fe and unavoidable impurity. PBS=BXSX10 to the power of 5; PMT=MnXTiX 10 to the power of 2. According to the composition, even constructing in the narrow groove, the complete penetration is obtained, and the weld metal having excellent mechanical properties of strength and toughness and so on is obtained.

Description

Solid wire for carbon-dioxide shield welding
Technical field
The present invention relates to mild steel or 490 to 520N/mm 2Employed solid wire for carbon-dioxide shield welding when the level high tension steel carries out shield carbon-dioxide arc welding; particularly relate to and to weld with high efficiency, and can access the solid-core welding wire for carbon dioxide gas protection arc welding of the well behaved weld metal of machinery.
Background technology
Recently, in the building iron field, with CO 2Gas as protective gas keeps arc-welding process, is mainly used from its high efficiency advantage.In the past; this gas protective arc welding method nearly all is to utilize the semiautomatic welding connection of staff; but still can further improve the purpose of welding efficiency during the cost that brings for labor saving and night or rest unattended, utilize the automatic welding of robot also to be popularized.On the other hand, aspect welding quality, rise to emphasis with vibration strength, for the performance that realizes welded-joint improves, during the JASS6 in 1997 revised and building standard method in 1999 revises, temperature was carried out upper limit management between the input heat energy of regulation during to welding, road.Be subject to the impact of this trend, welding wire also be developed out with high heat input, high road between welding wire corresponding to temperature, it is for 490N/mm 2Level steel steel plate can allow to reach between maximum input heat energy 40kJ/cm, road 350 ℃ of temperature, for 520N/mm 2Level steel steel plate can allow to reach between maximum input heat energy 30kJ/cm, road 250 ℃ of temperature, and 1999 as 540N/mm 2Level=YGW18 is by JISization.Later on until today, than before the large input heat energy of welding wire, high road between obtain the 540N/mm of excellent mechanical performance under the temperature 2The level welding wire is popularized hastily.In addition, this 540N/mm 2Although the level welding wire is popularized in the unmanageable semi-automatic welding of temperature between for input heat energy and road and to be got early, also large application 540N/mm in the Full-automatic welding of robot welding 2The level welding wire.
In the welding wire corresponding with temperature between existing carbon dioxide gas arc welding connects with large electric current, high road, generally, Si, Mn, the such deoxidation composition of Ti contain manyly than existing welding wire, and can add as required Mo, B, Cr, Al, Nb, V, Ni etc.Thus, by improving the hardenability of steel, the raising of the toughness that the miniaturization of combination crystal grain brings also has the effect of precipitation-hardening and solution hardening, thereby improves intensity.
Yet these existing welding wire actual conditions are all not consider and be designed for the welding of robot.Between existing large electric current, high road, in the corresponding welding wire of temperature, exist the slag generating capacity superfluous, and the poor such shortcoming of fissility.Slag is because there is insulating properties, so the slag of piling up can hinder arc stability, becomes immediate cause lack of penetration and that this defective of slag inclusion occurs.In addition, if even only have a small amount of slag not have nature to peel off, just reignition of arc is attempted in starting the arc position while welding robot can stagger, and can continue starting the arc mistake, so that welding robot decision error and stopping.Welding robot is by the unmanned strong point of having given play to maximum,, causes the short time destabilization of electric arc but piling up slag, then need to utilize staff to carry out high-frequency slagging-off operation, in order from starting the arc mistake, to recover, with regard to needing of having produced that the slag that carries out starting the arc section removes etc., thereby can not bring into play its strong point.Therefore, in order to address this problem, just expect that a kind of is under the condition of 350 ℃ of temperature between 40kJ/cm, the highest road, to have 490N/mm at the highest input heat energy 2The needed sufficient mechanical performance of level steel, and the slag generating capacity is few, fissility is also good, the continuous large high efficiency welding wire of stack height.
For this hope, as the welding wire that has improved the slag fissility, exploitation has the welding wire of record in JP 2006-88187 number, JP 2006-305605 number, JP 2006-150437 number.In addition, the welding wire that the slag fissility improves and the slag growing amount also reduces, open in JP 2004-122170 communique, JP 2006-26643 number.
Yet recent robotic welding technology's evolution is remarkable.Therefore, the narrow grooveization of 30 ° of bevel angles is also accomplished.Namely, although bevel angle was take 35 ° as standard in the past, but the number of weld passes that brings with dwindling of groove area reduces and shorten weld interval, the performance of the machinery of the weld metal of intensity that the use amount of welding wire is cut down, temperature rises between the reduction of thermal strain, road reduction brings and toughness etc. rises to purpose, and the narrow grooveization about 30 ° can be realized this.So, if bevel angle diminishes, then welding torch nib disturbs groove face easily, therefore inevitably, the distance from the welding torch front end to the groove bottom surface, so-called electrode extension is mostly elongated, thereby distinguishes that arc force reduces the lack of penetration easy generation that causes.In addition, because extension elongation is elongated, gas shield is deteriorated, and nitrogen is blended into the weld metal from atmosphere, and the tendency that makes toughness drop is also arranged.
In the past, do not prevent lack of penetration technology from the welding wire aspect developing.In addition, there be not the minimized of the slag fissility that both can realize existing excellence and slag amount, simultaneously yet excellent welding wire of the performance of the such machinery of intensity and toughness yet.Therefore, just lack of penetration being prevented developed in expectation, and the performance of machinery is also excellent, and optimal welding wire that can be corresponding with the narrow groove construction under the multilayer welding that utilizes robot.
Summary of the invention
The present invention does in view of such problem points; its purpose is; in the construction of narrow groove, also sufficient fusion penetration can be obtained even provide a kind of, the solid wire for carbon-dioxide shield welding of weld metal of excellent performance of the machinery of intensity and toughness etc. can be accessed.
Solid wire for carbon-dioxide shield welding of the present invention; contain the contained Cu:0.10 of C:0.03～0.10 quality %, Si:0.67～1.00 quality %, Mn:1.81～2.50 quality %, S:0.006～0.018 quality %, Ti:0.100～0.150 quality %, B:0.0015～0.0070 quality %, plating composition～below the 0.45 quality %; surplus is Fe and inevitable impurity, by the parameter P of following formula 1 and formula 2 expressions BSAnd P MTSatisfy P BS≤ 10, P MT≤ 32, and limit below the P:0.020 quality %, below the Nb:0.04 quality %, below the V:0.04 quality %, below the Al:0.04 quality %.
[formula 1]
P BS＝[B]×[S]×10 5
[formula 2]
P MT＝[Mn]×[Ti]×10 2
At this, [] meaning is the content (quality %) of this element in welding wire.
In this solid wire for carbon-dioxide shield welding, preferably contain at least a kind below the Mo:0.25 quality %, below the Cr:0.25 quality % and among below the Ni:0.25 quality %.In addition, there is the MoS of 0.01～1.00g in preferred every 10kg welding wire at welding wire surface 2
Description of drawings
Fig. 1 is the Ti amount of expression in the component of weld wire and the figure of electrode extension impact that fusion penetration is caused.
Fig. 2 is the B of expression among the application and the figure of the scope of S.
Fig. 3 is the Mn of expression among the application and the figure of the scope of Ti.
Fig. 4 is the figure of expression soldering test shape and groove shape.
Fig. 5 is the extracting position of weld metal tension test sheet.
Fig. 6 is the extracting position of weld metal pendulum impact test sheet.
The specific embodiment
Present inventors etc. are studied for the transitional form of electrode extension and molten drop and the relation of fusion penetration, and its result illustrates following item.In the welding wire amount of giving regularly, if extension elongation is elongated, then from the welding wire front end to tip in electrical impedance between the energising point raise cause easy melting because temperature rises, therefore supply with welding current from bonding machine and reduce, on the other hand, weldingvoltage rises.Under the condition of the increase of the minimizing of welding current and weldingvoltage, because the electric arc reaction force is little and spatial transition (electric arc is long) is long, so welding wire front end melting and the molten drop of falling weld part becomes the complete globular transfer of large grain easily.The directive property of electric arc dies down, and the molten drop of the concentric circles centered by welding wire falls the enlarged areas in zone.In addition, the transient period is also elongated, and the arc force that imposes on mother metal dies down, and fusion penetration diminishes.For fear of this phenomenon, prevent that completely the particle droplet transfer is the most effective, the present inventor finds for this reason, needs to suppress make molten drop that the factor of huge growth occur.The most influential to the size of this molten drop is Ti, and the Ti content in the welding wire is fewer, more can suppress molten drop and grow up, and become short circuiting transfer, and the centrality of electric arc increases, and molten drop falls the area reducing in zone, and fusion penetration increases.
Fig. 1 is that to establish transverse axis be electrode extension (mm), and the longitudinal axis is fusion penetration (mm), with the curve map of the relation of expression Ti content, electrode extension, fusion penetration.Wherein, the welding wire amount of giving is that 10m/ divides.As shown in Figure 1, electrode extension is longer, and fusion penetration is less, but when electrode extension was identical, Ti content was fewer, and fusion penetration is larger.
In addition, the Ti oxide is the slag source, by making the Ti amount than lacking in the past, can alleviate the problem points that produces because of the slag accumulation.
On the other hand, the compatibility of Ti and nitrogen is strong, can be combined with the nitrogen of protection when bad and prevents the generation of pore having the effect that prevents METAL EMBRITTLEMENT.Reduce Ti the generation of pore and the problem of METAL EMBRITTLEMENT are occured, therefore, the improvement of the fusion penetration that brings for the minimizing that makes Ti and the generation of pore and the problem of METAL EMBRITTLEMENT offset, and carry out goodization of amount of the content of Mn and B.
Below, add reason and form limiting reason and describe for the composition of solid wire for carbon-dioxide shield welding of the present invention.
" C:0.03～0.10 quality % "
C is be used to the important interpolation element of guaranteeing intensity, but when being lower than 0.03 quality %, then can not guarantee high needed intensity when temperature is welded between heat energy, high road of inputting.Therefore, C is more than the 0.03 quality %, is preferably more than the 0.05 quality %.On the other hand, if add C superfluously, then heat cracking occurs easily.In addition, if add C superfluously, then generating capacity increases because CO outburst phenomenon also can cause splashing in arc atmosphere, and arc stability is deteriorated.In addition, if C content is many, then the intensity of weld metal is excessive, and toughness reduces on the contrary.If C content surpasses 0.10 quality %, then these impacts become significantly, and therefore making its higher limit is 0.10 quality %.
" Si:0.67～1.00 quality % "
Si is mainly used in intensity to be guaranteed and prevents from adding because of the gas hole defect that deoxidation causes.Although the interpolation of Si increases the slag amount in addition, the slag fissility improves.These effects are that 0.67 quality % is effective when above at Si content.When Si content was lower than 0.67 quality %, the slag fissility was poor, the electric arc destabilization.The preferred lower limit of Si is 0.75 quality %.On the other hand, make it to surpass 1.00 quality % if add Si superfluously, then the slag amount is superfluous, and arc stability is deteriorated, and toughness value reduces.Therefore the higher limit of Si is 1.00 quality %.
" Mn:1.81～2.50 quality % "
Mn has the deoxidation effect of weld metal, and the intensity of weld metal is risen, and has the effect of the weld metal of the high tenacity of obtaining.Possess in the robot system of narrow groove corresponding function; maximum electrode extension is set longly; occur easily therefore can add more in large quantities Mn as robot with welding wire, thereby can prevent these shortcomings because protecting the bad pore that causes to occur and toughness drop.For this reason, Mn content needs to add more than the 1.81 quality % at least.On the other hand, if Mn content surpasses 2.50 quality %, then the slag amount increases, and the reduction of slag fissility, and consequently arc stability is also deteriorated.Also have, as described later, according to the Ti the relationship between quantities, the higher limit of Mn is lowlyer suppressed.
" S:0.006～0.018 quality % "
S reduces the surface tension in molten bath by its interpolation, makes the concavo-convex minimizing of the physical property when solidifying, thereby has the ganoid effect that makes weld metal.Thus, the slag fissility is improved.When S was lower than 0.006 quality %, this effect did not present, and the poor arc stability that causes of face fissility is deteriorated.On the other hand, surpass 0.018 quality % even add S, it is also saturated that the surface configuration of weld metal is improved effect, and heat cracking occurs in addition easily.In addition, can make the form spheroidizing of slag, hinder electric arc to carry out melting, become the unsettled reason of partial electric arc, and toughness reduce also.Therefore the higher limit of S is 0.018 quality %.Also have, as described later, according to the B the relationship between quantities, the higher limit of S is lowlyer suppressed.
" Ti:0.100～0.150 quality % "
Ti has the effect of the arc stability raising that makes high current field.In general, the welding wire of interpolation Ti about 0.20 quality % is more.One of feature of the composition of welding wire of the present invention is that Ti content is lower than general welding wire.When Ti was lower than 0.100 quality %, arc stability was deteriorated, and the generating capacity that splashes increases.Therefore, Ti need to add more than the 0.100 quality %.On the other hand, if improve Ti content, then because the variation of above-mentioned transfer manner of droplet causes fusion penetration to reduce, occur easily lack of penetration during electrode extension Go-to-and-fro.If Ti content surpasses 0.150 quality %, then can become the particle droplet transfer fully, occur lack of penetrationly, so to make its higher limit be 0.150 quality %.Also have as described later, according to the relation of Mn content, the higher limit of Ti content is lowlyer suppressed.When robot welding, usually can bestly set only voltage and speed of welding, even therefore Ti content is low, arc stability can be not deteriorated yet.
" B:0.0015～0.0070 quality % "
B makes the crystal grain miniaturization of weld metal by a small amount of interpolation, thereby has the effect of the intensity of making and toughness raising.When B content was lower than 0.0015 quality %, the raising effect of the intensity of weld metal and toughness did not manifest, and these mechanical characteristics are not enough.Therefore, B is take 0.0015 quality % as lower limit.On the other hand, surpass 0.0070 quality % if add B superfluously, heat cracking then occurs easily.Therefore, B content is take 0.0070 quality % as higher limit.Also have, according to the S the relationship between quantities, the higher limit of B content is lowlyer suppressed.
" Cu:0.10～0.45 quality % "
Cu makes heat cracking occur when surplus is added easily, and the character of slag is changed and makes fissility deteriorated.Consequently arc stability is deteriorated.Need to not add energetically Cu in the former wire rod of welding wire, in order to improve electric conductivity, resistance to rust, stringiness and ingenuity, it almost is the Cu composition in the copper facing of implementing as welding wire surface and being added.When Cu was scaled the following plating amount of the amount of 0.10 quality %, the thickness of plated film was excessively thin, poorly conductive, the unstable generation of electric arc, the increase of splashing.On the other hand, if Cu content surpasses 0.45 quality %, then heat cracking and slag fissility become problem, so the higher limit 0.45 quality % of Cu.Also have, Cu is with the value that plating is partly added up to copper contained in the wire rod.
“P BS≤10(P BS＝[B]×[S]×10 5)”
B and S are the elements that causes heat cracking, except the content of respectively separately regulation B and S, also need by interrelatedly stipulating two kinds of elements according to it, to prevent heat cracking.That is, because heat cracking occurs easily in the welding procedure of narrow groove, prevent so always need to be careful crackle, except stipulating separately respectively the content of this B and S, also need by interrelatedly stipulating two kinds of elements according to it.
Fig. 2 is that to establish transverse axis be S content, and establishing the longitudinal axis is B content, with the curve map of the relation of S and B content therewith such as expression crackle generation.As shown in Figure 2, from found that of the present application person's etc. experimental study, at P BS＞10 scope is even B and S are in prescribed limit of the present invention, but because two kinds of elements all are in high content range, so crackle occurs.Therefore, with relevant parameter P BSBe defined as P BS=[B] * [S] * 10 5The time ([B], [S] represent respectively B content (quality %), the S content (quality %) in the welding wire), need to make this P BSBe below 10.
“P MT≤32(P MT＝[Mn]×[Ti]×10 2)”
Mn and Ti are the main generting elements of slag, except the content of respectively separately regulation Mn and Ti, also need to occur to prevent superfluous slag by interrelatedly stipulating two kinds of elements according to it.
Fig. 3 is that to establish transverse axis be Mn content, and establishing the longitudinal axis is Ti content, with the curve map of the relation of Mn and Ti content therewith such as expression slag content.Present inventor's discovery, as shown in Figure 3, at P MT＞32 scope, though Mn and Ti all in prescribed limit of the present invention, but because two kinds of constituent contents are all high, so the slag growing amount is many, the slag fissility is variation also, so the stability degradation of electric arc.In addition, if the slag amount increases, then need to carry out continually slag and remove, running efficiency reduces.Therefore, with relevant parameter P MTBe defined as P MT=[Mn] * [Ti] * 10 2The time, ([Mn], [Ti] represent respectively Mn content (quality %), the Ti content (quality %) in the welding wire), need to make this P MTBe below 32.
" P:0.020 quality % is following "
P is the one of the chief elements that heat cracking is occured, the necessity of not adding energetically P.Therefore can the debatable higher limit of structure as heat cracking, the higher limit of P is set as 0.020 quality %.
" below the Nb:0.04 quality %, below the V:0.04 quality %, below the Al:0.04 quality % "
Nb, V, Al make the toughness drop of weld metal under low calorie input welding condition.For this reason, should avoid adding energetically these elements, as the upper limit of the deteriorated allowed band that can ignore of toughness, the higher limit of these elements is 0.04 quality % respectively.
" Mo:0.25 quality % is following, Cr:0.25 quality % following, Ni:0.25 quality % "
Mo, Cr, Ni improve the hardenability of weld metal, rise in order to make intensity, preferably add energetically.Even this Mo, Cr, Ni also can keep the intensity of appropriateness under temperature between higher input heat energy and road.The interpolation of these elements does not need to be installed with especially fixs limit, and still, if at least one is added into more than the 0.05 quality % among Mo, Cr and the Ni, then this effect is remarkable.On the other hand, surpass 0.25 quality % if add these elements, the microscopic structure formation of martensite of weld metal then, toughness drop.Therefore, these elements are respectively below the 0.25 quality % when adding.
" the MoS of welding wire surface 2: every 10kg welding wire is 0.01～1.00g "
Giving property of welding wire has a significant impact the slag fissility.Welding wire give stable also so that the molten bath form stable, the thickness homogeneous of the slag that generates, the strain of thermal contraction plays a role equably, peels off easily thus comprehensively.The MoS of welding wire surface 2Can reduce deposited to the electricity point between tip, welding wire, be related to the raising of giving property of welding wire.As existing giving property of welding wire raising method, the method that makes it superfluous oxidation along the crystal boundary of welding wire surface is arranged, but in the method, exist the O amount superfluous, the slag amount increases such shortcoming.With respect to this, MoS 2Coating compare with other giving property raising method, the slag amount is increased, therefore be suitable as giving property of the welding wire raising method of welding wire of the present invention.This effect is adhered to MoS at every 10kg welding wire 2Effective when reaching 0.01g.On the other hand, if every 10kg welding wire adheres to MoS 2Surpass 1.00g, then can begin to be stacked in the system of giving, because of MoS 2Obstruction can cause giving bad generation on the contrary, and the slag proterties is impacted.Thereby fissility is reduced.Consequently, arc stability is deteriorated.Therefore, preferably at welding wire surface, make every 10kg welding wire have the MoS of 0.01～1.00g 2
[embodiment]
Below, for effect of the present invention is described, for the welding wire of the embodiment that includes scope of the present invention in, and the welding wire of the comparative example that departs from the scope of the present invention, and the result of enforcement weldering test describes.Fig. 4 (a)～(c) is the figure of expression soldering test shape and groove shape.Fig. 4 (a) amplifies the profile that shows groove part, and 4 (b) are the front views of test body, and 4 (c) are side views.Dividing plate (diaphragm) 1 makes its face by arranged perpendicular, and round steel pipe 3 makes its axle horizontal, makes end face and the configuration of dividing plate 1 subtend of round steel pipe 3.The end face chamfering of this round steel pipe 3, and dividing plate 1 between form レ type groove.In addition, dispose the liner 2 of tubular at the inner face of round steel pipe 3.Then, carry out girth welding by 4 pairs of these groove parts of welding torch.
Following table 1 shows welding condition.In addition, following table 2 shows the combination of the steel plate of dividing plate 1, steel pipe 3 and liner 2, and table 3 shows the composition (quality %) of dividing plate 1, steel pipe 3 and liner 2.With the welding condition shown in the table 1, use the steel building of market sale to use the robot welding system, soldering test body shown in Figure 4 is welded.Also have, dividing plate 1 and steel pipe 3 are the blast furnace material, and with respect to this, liner 2 is the electric furnace material of market sale, and liner 2 oxygen contents are significantly high, and weldability is poor.Bevel angle is generally 35 °, and root gap is 7mm, but carrying out bevel angle in this soldering test is 30 °, and root gap is the narrow groove construction of 5mm.Then, calculate the fissility that welds the slag after finishing by Digital Image Processing, instrumentation slag amount as the intensity of weld metal and the index of toughness, is implemented tension test and pendulum impact test.Stability and the generating capacity that splashes of the electric arc during in addition, also record welds.In addition, by the ultrasonic test investigation whether lack of penetration and heat cracking occurs.
Following table 4 shows the composition (quality %) of the welding wire of embodiment and comparative example.In addition, following table 5 shows the result of the test of soldering test.Also have, be shown as "＜0.*** " in the composition of table 4, the analysis result that expression forms is the value that is lower than the lower limit of general analysis precision, industrial for not containing.
Evaluation method about each characteristic shown in the table 5 is as follows.About slag fissility evaluation method, the evaluation of fissility and slag amount is only carried out instrumentation under the thin condition 1 (with reference to table 2) of the thickness of slab of steel pipe.Also have, confirm at 1 time good welding wire of slag fissility of condition, good too condition 2 times.In the welding starting point when entering the welding of final welding bead, centered by 90 ° the place turned back from welding wire, to 100mm before and after it, add up to 200mm take pictures (with reference to Fig. 4 (b) and (c)).Then, to this welding bead outward appearance photo, two-value turns to part that (a) slag peeled off naturally and (b) the slag part of adhering to, and tries to achieve its distribution.By image analysis software difference calculating pixel, try to achieve slag with (a)/((a)+(b)) * 100 and peel off rate (%).Slag peel off rate be more than 15% to be judged to be the slag fissility good.
Then, about the slag amount, be to reclaim whole slags, be also included within and naturally peel off behind the welding bead outward appearance photograph taking, it is carried out gravimetry.This slag amount be 12g following for the slag amount good.
The tension test of weld metal and pendulum impact test are in condition 2 times (with reference to table 2), extract respectively JIS Z 3111 A2 number (parallel portion diameter 6mm) and code test sheet (10mm angle) from Fig. 5 and position shown in Figure 6 for test.Also have, tension test is under 20 ℃ room temperature, and pendulum impact test is 0 ℃, with 3 on average as evaluation of estimate.Tensile strength is 490N/mm 2More than, the average 70J of pendulum impact test is above to be qualified.
Arc stability is by the sensory evaluation in the welding, and the situation that slag did not disturb, upset the generation of electric arc especially is judged as well.Also have, to give the situation that the bad confusion that causes electric arc occurs also defective because of welding wire.
The generating capacity that splashes is after the welding of condition 1 time (with reference to table 2) finishes, and reclaims and is attached to splashing on the tip (shield nozzle), and it is carried out gravimetry.The generating capacity that splashes is to be judged to be below the 6g well.
[table 1]
The welding machine Bar-welding machine device people
The source of welding current, polarity DC generator, antipolarity
Protective gas CO 2, 25 liter/mins of clocks of flow
Gage of wire 1.2mm
The input heat Maximum 40kJ/cm
Temperature between the road Maximum 350 ℃
Posture Downwards
Welding wire is given prominence to length 27 to 35mm
Slag is removed Condition 1: nothing, condition 2: have
Tip adheres to splash removing and cleaning Condition 1: nothing, condition 2: have
[table 2]
Dividing plate Steel pipe Liner
Condition 1 (thin plate) SN490C thickness of slab 25mm * 450mm limit STKN490B wall thickness 16mm * external diameter 350mm SN490A wall thickness 9mm * external diameter 334mm
Condition 2 (slab) SN490C thickness of slab 75mm * 800mm limit STKN490B wall thickness 60mm * external diameter 700mm SN490A wall thickness 9mm * external diameter 40mm
[table 3]
Purposes/steel grade C Si Mn P S N
Dividing plate/SN490C 0.15 0.35 1.45 0.010 0.003 0.0029
Steel pipe/STKN490B 0.09 0.12 1.02 0.010 0.003 0.0035
Liner/SN490A 0.11 0.13 0.46 0.017 0.022 0.0125
[table 4-1]
Figure G200910001711XD00101
Figure G200910001711XD00111
[table 4-2]
Figure G200910001711XD00112
[table 4-3]
Figure G200910001711XD00113
[table 4-4]
Figure G200910001711XD00122
[table 5-1]
Figure G200910001711XD00131
[table 5-2]
Figure G200910001711XD00132
Figure G200910001711XD00141
As shown in table 5, embodiments of the invention 1～18, the compositing range of each composition is in the scope of the present invention's regulation, therefore intensity, toughness, arc stability, low spatter, fusion penetration performance and the resistance to cracking line of the fissility of slag, slag amount, weld metal are all good, can access the character of the machinery of excellent weld job and weld metal excellence.
On the other hand, comparative example 19～50 departs from the scope of the present invention, and wherein comparative example 19 its C are very few, the undercapacity of weld metal.Its C of comparative example 20 are superfluous, and heat cracking occurs on the weld metal, intensity surplus and toughness is deteriorated.In addition, it is also many to splash, and arc stability is poor, so continuous welding is also deteriorated.21 its Si are very few for comparative example, the undercapacity of weld metal, and the slag fissility is also poor, and slag disturbs and causes electric arc unstable, and continuous welding is deteriorated.In addition, because of the deoxidation deficiency pore has occured also.22 its Si are superfluous for comparative example, and the toughness of weld metal is not enough, and the slag amount is superfluous and become interference, and electric arc is unstable, and sequential welding is deteriorated.23 its Mn are very few for comparative example, and toughness is low,, because pore has also occured in the deoxidation deficiency.24 its Mn are superfluous for comparative example, and the slag amount is many, and fissility is also poor.In addition, slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.25 its Ti are very few for comparative example, and the generating capacity that splashes is many, and arc stability is poor, and tip stops up easily, so continuous welding is deteriorated.Comparative example 26,27 its Ti surpluses, the droplet transfer becomes globular transfer fully, and is therefore lack of penetration multiple.Although each composition of comparative example 28 its Mn, Ti satisfies respectively prescribed limit, parameter P MTExcessive, so the slag amount is many, fissility is also poor.In addition, slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.29 its S are very few for comparative example, and the fissility of slag is poor, and slag disturbs and electric arc is unstable, and continuous welding is deteriorated.30 its S are superfluous for comparative example, and toughness is low, and heat cracking has occured.Although the slag fissility is good, the granulating of adhering to, thickness increases and the stability of infringement electric arc.Consequently continuous welding is deteriorated.
Although each composition of comparative example 31 its S and B satisfies prescribed limit of the present invention, parameter P BSExcessive, so the resistance to cracking line is impaired, has crackle to occur.Its P of comparative example 32 are superfluous, and toughness is low, and also sent out heat cracking peaceful.33 its Cu are very few for comparative example, and therefore the thin thickness of copper coating conducts electricity bad.Small deposited multiple and make the electric arc destabilization, splashing also increases.34 its Cu are superfluous for comparative example, and heat cracking occurs, and the slag fissility is also poor, and slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.35 its B are not enough for comparative example, and intensity and toughness are not enough.36 its B are superfluous for comparative example, and heat cracking occurs.
Comparative example 37 its Mn, Ti, B and S and element satisfy separately respectively prescribed limit of the present invention, but parameter P MT, P BSExceed prescribed limit of the present invention.Therefore, the slag amount is many, and the slag fissility is also poor.In addition, slag disturbs and makes electric arc unstable, and continuous welding is deteriorated, and heat cracking has occured in addition.Comparative example 38～40 is respectively Nb, V, Al is superfluous, toughness drop.Comparative example 41～43 is respectively Mo, Cr, Ni is superfluous, although intensity improves, its intensity is superfluous, on the contrary toughness drop.Comparative example 44 its MoS 2Adhesion amount is superfluous, and pipeline (conduit liner) etc. is given MoS in the system 2Pile up and stop up, welding wire is given very unstable.Consequently arc stability is impaired, and the slag distributing inhomogeneity also brings adverse effect, and the slag fissility reduces.The result is that the slag interference makes electric arc unstable, and continuous welding is deteriorated.
45 its Ti are superfluous for comparative example, and S is very few, does not add B.Therefore, because the Ti surplus causes the droplet transfer to become particle fully, therefore penetration is not multiple.Because S is very few, the slag fissility is also poor in addition.In addition, slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.In addition, because do not add B, so intensity and toughness are not enough.46 its Ti are superfluous for comparative example, and S and Mn are very few.Because the Ti surplus causes the droplet transfer to become globular transfer fully, therefore lack of penetration multiple.In addition, because S is very few, fissility is also poor.Slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.Because Mn is very few, so intensity and toughness are not enough, and pore has also occured because of the deoxidation deficiency.47 its C are superfluous for comparative example, and Mn is not enough, does not add Ti and B.Therefore, because Mn is not enough and do not add B, cause intensity and toughness not enough, because pore has also occured the deoxidation deficiency.Owing to C is superfluous heat cracking occurs, complement each other with not adding Ti in addition, cause and splash extremely manyly, arc stability is poor.
Comparative example 48 its Ti, P MT, the superfluous Si of Mo and S are not enough.Therefore, because the Ti surplus causes the droplet transfer to become globular transfer fully, therefore penetration is not multiple.In addition, because Si and S are very few, the slag fissility is also poor.Slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.In addition, the Mo surplus causes toughness not enough.In addition, because the Si deficiency causes deoxidation not enough, pore has occured also.Comparative example 49 its Si and S are superfluous, and Ti is not enough, does not add B.Since do not add B, toughness drop, and intensity is also low.Because Si and S are superfluous, so the slag amount is many, and spheroidizing and damage arc stability.Consequently, continuous welding is deteriorated.In addition, because the Ti deficiency causes splashing multiple.Because S is superfluous, heat cracking also occurs.50 its Si are not enough for comparative example, and B is superfluous, P BSExcessive.Because the Si deficiency causes the undercapacity of weld metal, the slag fissility is also poor, and slag disturbs and makes electric arc unstable, and continuous welding is deteriorated.Because the Si deficiency causes deoxidation not enough, and pore has also occured.In addition, because P BSExcessive, so heat cracking also occurs.

Claims (3)

1. solid wire for carbon-dioxide shield welding; it is characterized in that; contain Cu:0.10 contained in C:0.03～0.10 quality %, Si:0.67～1.00 quality %, Mn:1.81～2.50 quality %, S:0.006～0.018 quality %, Ti:0.11～0.140 quality %, B:0.0015～0.0070 quality %, the plating composition～0.45 quality %; surplus is Fe and inevitable impurity
The parameter P that is expressed from the next BSAnd P MTSatisfy P BS≤ 10, P MT≤ 29.4, and limit below the P:0.020 quality %, below the Nb:0.04 quality %, below the V:0.04 quality %, below the Al:0.04 quality %,
P BS＝[B]×[S]×10 5
P MT＝[Mn]×[Ti]×10 2
At this, [] meaning is the mass percentage content of this element in welding wire.
2. solid wire for carbon-dioxide shield welding according to claim 1 is characterized in that, contain also that Mo:0.25 quality % is following, Cr:0.25 quality % following and Ni:0.25 quality % with lower at least a kind.
3. solid wire for carbon-dioxide shield welding according to claim 1 and 2 is characterized in that, in every 10kg welding wire, welding wire surface contains the MoS of 0.01～1.00g 2
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CN103464871B (en) * 2013-09-06 2016-03-30 海宁瑞奥金属科技有限公司 A kind of high tenacity CO 2gas protecting welding wire and application thereof
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CN106181114A (en) * 2015-04-29 2016-12-07 海宁瑞奥金属科技有限公司 The low spatter gas shield welding wire that arc stability is excellent
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CN106216877B (en) * 2016-07-26 2018-08-31 江苏省沙钢钢铁研究院有限公司 A kind of high durable gas protecting welding wire of welding property excellent
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