CN101497154A - Solid wire for carbon-dioxide shield welding - Google Patents

Solid wire for carbon-dioxide shield welding Download PDF

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Publication number
CN101497154A
CN101497154A CNA200910001711XA CN200910001711A CN101497154A CN 101497154 A CN101497154 A CN 101497154A CN A200910001711X A CNA200910001711X A CN A200910001711XA CN 200910001711 A CN200910001711 A CN 200910001711A CN 101497154 A CN101497154 A CN 101497154A
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quality
welding
slag
mass
welding wire
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CNA200910001711XA
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CN101497154B (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=[b]X[S]X10 to the power of 5; PMT=[Mn]X[Ti]X 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 shielded arc welding connection nearly all is to utilize the semiautomatic welding connection of staff; but still can further improve the purpose of welding efficiency during the cost reduction that brings for labor savingization 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 subjected to the influence of this trend, welding wire also be developed out with high heat input, high road between the corresponding welding wire of 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 big 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 2Though the level welding wire is popularized early between for input heat energy and road in the unmanageable semi-automatic welding of temperature, also big 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 big electric current, high road, generally, Si, Mn, the such deoxidation composition of Ti contain manyly than existing welding wire, and can add Mo, B, Cr, Al, Nb, V, Ni etc. as required.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 big electric current, high road, in the corresponding welding wire of temperature, there is slag generating capacity surplus, and the such shortcoming of fissility difference.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 takes place.In addition, if even have only 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 instabilityization 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 portion 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 big high efficiency welding wire of stack height.
At this hope, as the welding wire that has improved the slag fissility, exploitation has the spy to open 2006-88187 number, spy to open 2006-305605 number, spy and open the welding wire of record in 2006-150437 number.In addition, the welding wire that the slag fissility improves and the slag growing amount also reduces is opened the 2004-122170 communique the spy, the spy opens in 2006-26643 number open.
Yet recent robotic welding technology's evolution is remarkable.Therefore, the narrow grooveization of 30 ° of bevel angles is also accomplished.Promptly, though bevel angle was a standard with 35 ° 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 elongated mostly, thereby distinguishes that arc force reduces the lack of penetration easy generation that causes.In addition, because extension elongation is elongated, the gas shield deterioration, nitrogen is blended into the weld metal from atmosphere, the tendency that also has the toughness of making to reduce.
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 the yet excellent welding wire of 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 can with the corresponding optimal welding wire of constructing of the narrow groove 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 unavoidable impurities, 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 influence 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. study 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 fusion because temperature rises, therefore supply with welding current and reduce from bonding machine, 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 fusion and the molten drop of falling weld part becomes the complete globular transfer of big grain easily.The directive property of electric arc dies down, and is that the molten drop of the concentric circles at center falls the enlarged areas in zone with the welding wire.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 take place.The most influential to the size of this molten drop is Ti, and the Ti content in the welding wire is few more, can suppress molten drop more and grow up, and become short circuiting transfer, and the centrality of electric arc increases, and the area that molten drop falls the zone dwindles, 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 the 10m/ branch.As shown in Figure 1, electrode extension is long more, and fusion penetration is more little, but when electrode extension was identical, Ti content was few more, and fusion penetration is big more.
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 combine with the nitrogen of protection when bad and prevents the generation of pore to have the effect that prevents METAL EMBRITTLEMENT.Reduce Ti the generation of pore and the problem of METAL EMBRITTLEMENT are taken place, 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 the important interpolation element that is used to guarantee 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 importing.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 takes place easily.In addition, if add C superfluously, then generating capacity increases the arc stability deterioration because CO outburst phenomenon also can cause splashing in arc atmosphere.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 influences 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 to add because of the gas hole defect that deoxidation causes.Though 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 instabilityization.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, slag amount surplus then, the arc stability deterioration, 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; take place easily therefore can add Mn more in large quantities with welding wire, thereby can prevent these shortcomings as robot because of protecting the bad pore that causes to take place and the toughness reduction.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 slag fissility reduces, consequently also deterioration of arc stability.Also have, as described later, according to the relation of Ti amount, the higher limit of Mn is suppressed lowlyer.
" 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 face fissility difference causes the arc stability deterioration.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 takes place in addition easily.In addition, can make the form spheroidizing of slag, hinder electric arc to carry out fusion, become the unsettled reason of electric arc of part, and toughness reduce also.Therefore the higher limit of S is 0.018 quality %.Also have, as described later, according to the relation of B amount, the higher limit of S is suppressed lowlyer.
" 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 is lower than 0.100 quality %, the arc stability deterioration, the generating capacity that splashes increases.Therefore, Ti need add more than the 0.100 quality %.On the other hand, if improve Ti content, then, take place lack of penetration during electrode extension Go-to-and-fro easily because the variation of above-mentioned transfer manner of droplet causes fusion penetration to reduce.If Ti content surpasses 0.150 quality %, then can become the particle droplet transfer fully, take place 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 suppressed lowlyer.When robot welding, can bestly set only voltage and speed of welding usually, even therefore Ti content is low, arc stability can deterioration yet.
" B:0.0015～0.0070 quality % "
B makes the crystal grain miniaturization of weld metal by a spot of interpolation, thereby has the effect of 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, the characteristic deficiency that these are mechanical.Therefore, B is a lower limit with 0.0015 quality %.On the other hand, surpass 0.0070 quality %, heat cracking then takes place easily if add B superfluously.Therefore, B content is higher limit with 0.0070 quality %.Also have, according to the relation of S amount, the higher limit of B content is suppressed lowlyer.
" Cu:0.10～0.45 quality % "
Cu makes heat cracking take place when surplus is added easily, and the character of slag is changed and makes the fissility deterioration.Arc stability deterioration consequently.Need not add Cu energetically 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 thin excessively, poorly conductive, and electric arc is unstable, and the increase of splashing takes place.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,, prevent, except stipulating the content of this B and S respectively separately, also need by interrelatedly stipulating two kinds of elements according to it so always need to be careful crackle because heat cracking takes place easily in the welding procedure of narrow groove.
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 BS10 scope, 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 takes place.Therefore, with relevant parameter P BSBe defined as P BS=[B] * [S] * 10 5The time ([B], [S] represent B content (quality %), the S content (quality %) in the welding wire respectively), need 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 take place 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 MT32 scope, even 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 Mn content (quality %), the Ti content (quality %) in the welding wire respectively), need make this P MTBe below 32.
" P:0.020 quality % is following "
P is the one of the chief elements that heat cracking is taken place, the necessity of not adding P energetically.Therefore can not constitute the higher limit of problem as heat cracking, the higher limit of P is set at 0.020 quality %.
" below the Nb:0.04 quality %, below the V:0.04 quality %, below the Al:0.04 quality % "
Nb, V, Al reduce the toughness of weld metal under low heat energy input welding condition.For this reason, should avoid adding energetically these elements, the upper limit of the allowed band that can ignore as the toughness deterioration, 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 special the pressure to set lower 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 reduces.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 gives that stable to make that also the molten bath forms stable, the thickness homogeneous of the slag that is generated, and the strain of thermal contraction plays a role equably, peels off easily thus comprehensively.The MoS of welding wire surface 2Can reduce electric put deposited of giving 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 deterioration.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 welding wire of the embodiment that includes scope of the present invention in and the comparative example that departs from the scope of the present invention, and the result who implements the 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 the 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.The 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 takes place.
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 is formed 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, be the center with 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 peel off naturally 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 JIS Z 3111 A2 number (parallel portion diameter 6mm) and code test sheet (10mm angle) respectively 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 takes place 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 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 The reinforcing bar welding robot
The source of welding current, polarity DC generator, antipolarity
Protective gas CO 2, 25 liters/minute of flows
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 A200910001711D00121
Figure A200910001711D00131
[table 4-2]
Figure A200910001711D00132
[table 4-3]
Figure A200910001711D00133
Figure A200910001711D00141
[table 4-4]
Figure A200910001711D00142
[table 5-1]
Figure A200910001711D00151
[table 5-2]
Figure A200910001711D00152
Figure A200910001711D00161
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 anti-crackle 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.Heat cracking takes place in comparative example 20 its C surpluses on the weld metal, intensity surplus and toughness deterioration.In addition, it is also many to splash, and arc stability is poor, so also deterioration of continuous welding.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 instability, continuous welding deterioration.In addition, because of the deoxidation deficiency pore has taken place also.Comparative example 22 its Si surpluses, the toughness deficiency of weld metal, the slag amount is superfluous and become interference, electric arc instability, sequential welding deterioration.23 its Mn are very few for comparative example, and toughness is low,, because of pore has also taken place in the deoxidation deficiency.Comparative example 24 its Mn surpluses, the slag amount is many, and fissility is also poor.In addition, slag disturbs and makes electric arc instability, continuous welding deterioration.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 the continuous welding deterioration.Comparative example 26,27 its Ti surpluses, the droplet transfer becomes globular transfer fully, therefore lack of penetration pilosity.Though each composition of comparative example 28 its Mn, Ti satisfies prescribed limit, parameter P respectively MTExcessive, so the slag amount is many, fissility is also poor.In addition, slag disturbs and makes electric arc instability, continuous welding deterioration.29 its S are very few for comparative example, and the fissility of slag is poor, and slag disturbs and the electric arc instability, the continuous welding deterioration.Comparative example 30 its S surpluses, toughness is low, and heat cracking has taken place.Though the slag fissility is good, the granulating of adhering to, thickness increases and the stability of infringement electric arc.Consequently continuous welding deterioration.
Though each composition of comparative example 31 its S and B satisfies prescribed limit of the present invention, parameter P BSExcessive, therefore anti-crackle is impaired, has crackle to take place.Comparative example 32 its P surpluses, toughness is low, and has 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 pilosity and make the electric arc instabilityization, splashing also increases.Comparative example 34 its Cu surpluses, heat cracking takes place, and the slag fissility is also poor, and slag disturbs and makes electric arc instability, continuous welding deterioration.Comparative example 35 its B deficiency, intensity and toughness deficiencies.Comparative example 36 its B surpluses, heat cracking takes place.
Comparative example 37 its Mn, Ti, B and S and element satisfy prescribed limit of the present invention respectively separately, 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 the electric arc instability, and heat cracking has taken place the continuous welding deterioration in addition.Comparative example 38～40 is respectively Nb, V, Al surplus, and toughness reduces.Comparative example 41～43 is respectively Mo, Cr, Ni surplus, though intensity improves its intensity surplus, otherwise toughness reduction.Comparative example 44 its MoS 2The adhesion amount surplus, 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 slag skewness one is changed and brought adverse effect, and the slag fissility reduces.The result is that the slag interference makes electric arc instability, continuous welding deterioration.
Comparative example 45 its Ti surpluses, S is very few, does not add B.Therefore, because the Ti surplus causes the droplet transfer to become particle fully, therefore penetration pilosity not.Because S is very few, the slag fissility is also poor in addition.In addition, slag disturbs and makes electric arc instability, continuous welding deterioration.In addition, because do not add B, so intensity and toughness deficiency.Comparative example 46 its Ti surpluses, S and Mn are very few.Because the Ti surplus causes the droplet transfer to become globular transfer fully, so lack of penetration pilosity.In addition, because S is very few, fissility is also poor.Slag disturbs and makes electric arc instability, continuous welding deterioration.Because Mn is very few, thus intensity and toughness deficiency, and pore has also taken place because of the deoxidation deficiency.Comparative example 47 its C surpluses, the Mn deficiency is not added Ti and B.Therefore, because Mn is not enough and do not add B, cause intensity and toughness deficiency, because of pore has also taken place the deoxidation deficiency.Owing to C is superfluous heat cracking takes place, 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 deficiency.Therefore, because the Ti surplus causes the droplet transfer to become globular transfer fully, therefore penetration pilosity not.In addition, because Si and S are very few, the slag fissility is also poor.Slag disturbs and makes electric arc instability, continuous welding deterioration.In addition, the Mo surplus causes the toughness deficiency.In addition, because of the Si deficiency causes the deoxidation deficiency, pore has taken place also.Comparative example 49 its Si and S surplus, the Ti deficiency is not added B.Owing to do not add B, toughness reduces, and intensity is also low.Because Si and S surplus, so the slag amount is many, and spheroidizing and damage arc stability.Consequently, continuous welding deterioration.In addition, because the Ti deficiency causes the pilosity that splashes.Because the S surplus, heat cracking also takes place.Comparative example 50 its Si deficiencies, B surplus, 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 instability, continuous welding deterioration.Because the Si deficiency causes the deoxidation deficiency, and pore has also taken place.In addition, because P BSExcessive, so heat cracking also takes place.

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:0.100～0.150 quality %, B:0.0015～0.0070 quality %, the plating composition～0.45 quality %; surplus is Fe and unavoidable impurities
The parameter P that is expressed from the next 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 %,
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, also contains at least a kind below the Mo:0.25 quality %, below the Cr:0.25 quality % and in below the Ni:0.25 quality %.
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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