CN1593836A - High strength high tenacity high weather resistant gas protecting welding wire - Google Patents
High strength high tenacity high weather resistant gas protecting welding wire Download PDFInfo
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Abstract
The invention relates to a kind of high strength, high tenacity, high withering, and air protecting welding thread. It can avoid mismatching of present welding material, especially poor quality of prevent gas erode. The technique is flowing: first the chemical component is : C:0.04~0.12; Si:0.40~0.80; Mn:1.40~2.0;P<=0.020;S0.015;Ni:0.40~1.0;Cr:0.20~0.50;Ti:0.06~0.20;Cu:0.30~0.50;B:0.002~0.0079;Als<=0.02; a little Fe and other unavoidable impurities. The welding thread is protected by mix gas that is made of percent 80 Ar and percent 20 CO2. The thread head is better in gas eroding proof and mechanism. The tensile strength of the welding slot is as high as 735MPa. And AKv(-0.4 DEG C) of it is 182 J, AKv(-0.6 DEG C) of it is 173 DEG C. The thread is suited to gas protecting welding for important part of railroad, bridge, pipe and so on.
Description
One, technical field
The present invention relates to the gas shielded arc welding wire material that a kind of Metal Material Welding is used, be particularly useful for welded high-strength-and-toughness and have the welding wire for gas shielded welding of the steel grade that high-weatherability can require.
Two, background technology
Along with the high speed development of Chinese national economy, the railway transportation industry enters the high-speed developing period.In recent years, China railways has successively been carried out raising speed by a large scale five times, has begun to take shape the acceleration network of " four vertical two horizontal strokes ".The demand that require for satisfying railway speed increase loss of weight and bridge spanning the sea, military project naval vessel, oil pipeline etc. that its steel grade height is weather-proof, high strength, high tenacity and desired strength rank reaches 500-700MPa, so the performance of welding point is also had higher requirement, welding point must have obdurability and the weather resistance suitable with base material, and intensity rank also will reach 500-700MPa.Corresponding welding materials also must satisfy this requirement simultaneously, and wants economy.But the still incompetent corresponding gas protection wire kind that satisfies the demands of existing market.There is not the weathering steel gas protecting welding wire in the existing national standard; two kinds of weather-proof gas protection wire intensity ranks of the specification requirement WER44-8I of the former standard laid down by the ministries or commissions of the Central Government TB/T2374-1999 of the Ministry of Railways, WER44-8II are 440Mpa, far can not need the growth requirement of the high-level new steel grade of sufficient railway speed increase loss of weight.Publication number is the CN1413795A patent application, and it mainly makes in order to realize welding the purpose that sensitiveness is little, the commissure metal is close with the mother metal results of property of commissure, back metal cold crack.But fail to solve the problem of the welding material atmospheric corrosion resistance that is complementary of high-level weather-proof series structure steel grade.
Three, summary of the invention
The object of the present invention is to provide welding performance stable, it is little to splash, the high weather-proof gas protecting welding wire of the high-intensity high-tenacity that pore-free, commissure metal and high-level weather-proof series structure steel grade performance are complementary.
Realize the above-mentioned purpose technology contents:
The high weather-proof gas shield welding wire of high-intensity high-tenacity, the chemical composition (weight %) that it is characterized in that forming this welding wire is: C:0.04～0.12, Si:0.40～0.80, Mn:1.40～2.0, P≤0.020, S≤0.015, Ni:0.40～1.0, Cr:0.20～0.50, Ti:0.06～0.20, Cu:0.30～0.50, B:0.002～0.0079, Als≤0.02, surplus are that Fe inevitably is mingled with other.
Enforcement of the present invention is by mist (80%Ar+20%CO
2) protect and weld.
Add trace alloying elements such as suitable Ti, B, Ni, Cr, Cu in the welding wire, to impel the fine acicular ferritic structure that in weld metal, produces a large amount of high density dislocations.It specifically acts on:
Metal element Ti, B: in weld seam, unite and add Ti, B, can limit the transformation of pro-eutectoid ferrite, and enlarge the zone that acicular ferrite changes, obtain a large amount of acicular ferrites thereby in weld seam, can stablize.Also help and suppress in the weld seam austenite crystal and grow up, postpone austenite, impel the formation of weld metal intracrystalline acicular ferrite, the refinement subgrain to ferritic transition temperature.Adding Ti in the welding wire can thinning weld metal structure.Ti and N have high affinity, and Ti and N are combined into the TiN particle, as nucleus, impel the formation of acicular ferrite in the weld seam.
The B of solid solution assembles reduction crystal boundary energy at austenite grain boundary, can control separating out of pro-eutectoid ferrite, and B is deferrable austenite → ferritic phase transition temperature also, helps the formation of intragranular acicular ferrite.
Metallic element Si, Mn: in welding wire, add Si, Mn,, form oxide inclusions or the oxygen sulfur compound is mingled with by deoxygenation so that it is in carrying out the transition to weld seam the time.Some field trash is the nitride that the Ti denitrogenation forms.These field trashes can be used as the forming core particle of acicular ferrite.The quantity of forming core particle directly determines the size of acicular ferrite faller gill.Si is controlled at 0.40-0.80%, plays deoxidation and strengthen welds effect when welding.Mn is controlled at 1.40-2.0%, and Mn is the effective element of weld seam Strengthening and Toughening, helps deoxidation in weld seam, prevents to cause the formation of the iron sulfide of fire check.
Metal C, Mn, Si, Ni, Cr, Cu various element can improve the quenching degree of weld metal, suppress the generation of pro-eutectoid ferrite, promote the formation of acicular ferrite.C is controlled at 0.04-0.12% in the welding wire, and the obdurability of C constituent content butt welded seam and tissue thereof are formed bigger influence.When C content was low, weld strength was lower, and ratio of ferrite is higher in the weld metal.When C content was higher, welding seam toughness descended, and weld seam medium pearlite ratio increases.Therefore C too high levels or mistake are hanged down and all can be influenced acicular ferrite content in the weld seam.
The toughness that Ni helps improving weld metal in the welding wire is low-temperature impact toughness especially, reduces brittle transition temperature.Ni is controlled at 0.40-1.0%.When Ni content is too high, not only cause welding wire intensity and hardness too high, weld seam and mother metal composition difference are strengthened, the welding wire cost is increased.
Proper C u, Cr butt welding are sewed with invigoration effect, to increase the atmospheric corrosion resistance of weld seam.Cu content improved weld strength less than 0.5% o'clock in the solution strengthening mode, and reduced the acicular ferrite initial transition temperature, improved acicular ferrite content; When Cu content greater than 0.5% the time, separating out the mode strengthen welds, but butt welded seam toughness is unfavorable.Therefore Cu content in the welding wire is controlled at 0.20～0.50%.Contain certain Cr element in the weld seam and help improving acicular ferrite content in the weld seam, reduce pro-eutectoid ferrite, and the effect of refinement ferrite crystal grain is arranged, improve the weld seam obdurability.Performance maintained higher level after Cr also helped to keep weld seam heat treatment.
The Als element helps deoxidation in weld seam, in order to improve the toughness of weld metal, but content should be controlled at less than in the 0.01% low scope for well.
S, P, element are harmful element, thus its content is controlled in the low scope, to improve weld seam degree of purity and welding performance and further to improve the weld seam weather resistance.
Gas protecting welding wire preparation methods of the present invention is identical with the prior art for preparation method.
Gas protecting welding wire of the present invention has following advantage:
1, stable being easy to of this welding wire steel smelting process realized, function admirables such as the rolling and welding wire of steel billet draws and dials, copper facing satisfy that railway speed increase loss of weight and bridge spanning the sea, military project naval vessel, oil pipeline etc. require that its steel grade height is weather-proof, the solder technology requirement of high strength, high tenacity steel series.
2, welding wire of the present invention is used for the welding of 500-700MPa intensity rank steel grade, welding wire has good welding technological properties, welding arc stablility, it is little to splash, pore-free, moulding are attractive in appearance, be adapted to all-position welding, weld seam has and quite high obdurability matching performance of base material and good atmospheric corrosion resistance.
Four, specific embodiments
Be described in further detail the present invention with embodiment below:
Embodiment 1: utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 1.2mm, copper coating with drawing through rolling.The chemical composition of its composition (weight %) is: C:0.06, and Si:0.49, Mn:1.81, S:0.005, P:0.010, Ni:0.62, Cr:0.26, Ti:0.11, B:0.006, Cu:0.26, Als:0.009, all the other inevitably are mingled with other for Fe.Adopt rich argon mixture gas (80%Ar+20%CO
2) carrying out soldering test as protective gas, welding current is 250～260A, and weldingvoltage is 28V, and speed of welding is 275mm/min.Interlayer temperature≤150 ℃.Weld metal yield strength ReL=665MPa, tensile strength Rm=735MPa, percentage elongation A=20%, contraction percentage of area Z=68%.The average ballistic work Akv of deposited metal (20 ℃)=204J, Akv (30 ℃)=182J, Akv (40 ℃)=180J, Akv (60 ℃)=173J has excellent low temperature impact toughness.
Embodiment 2: utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 1.2mm, copper coating with drawing through rolling.The chemical composition of its composition (weight %) is: C:0.07, and Si:0.60, Mn:1.60, S:0.006, P:0.012, Ni:0.70, Cr:0.33, Ti:0.14, B:0.005, Cu:0.35, Als:0.005, all the other inevitably are mingled with other for Fe.Welding wire adopts 80%Ar+20%CO
2As protective gas, the thick railway locomotive speed-raising of welding 12mm weathering steel W400QN, the chemical composition of its steel (% by weight) mainly contains C:0.07, Si:0.39, Mn:0.35, Cu:0.30, Cr:0.42, Ni:0.30, P:0.009, S:0.006.Mechanical performance ReL=410MPa, Rm=535MPa. ballistic work Akv (40 ℃)=79J.Welding procedure is a Y type groove, and root face is 1mm, and bevel angle is 60 °, and welding condition is welding current 260～270A, and weldingvoltage～27V welds fast 29cm/min.The weld seam tension test is broken at base material, positive recurvation d=3a, and 120 ° are qualified, and tensile strength, the cold-bending property of welding point are good.Weld seam ballistic work Akv (20 ℃)=89J, Akv (60 ℃)=68J, Akv (70 ℃)=61J.Vertically butt joint test plate (panel) melt run, heat affected area ballistic work reach higher level.Seam organization is mainly pro-eutectoid ferrite+intracrystalline acicular ferrite, and the overheated zone is organized as bainite structure.Weld seam three districts have higher low-temperature impact toughness, and joint has good welding technological properties and good cryogenic property.Full welding line joint corrosive nature test has adopted 2 samples to carry out joint electrochemical corrosion test altogether.Experimental condition and result of the test: weld joint samples is polished, and through 3% nitric acid alcohol etch, makes the naked eyes can clear resolution base material-heat affected area (HAZ)-weld seam.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, record when stablizing 2 minutes and respectively distinguish corrosion potential.Base material electrochemical corrosion test welding point is respectively distinguished current potential: base material: negative 530 millivolts, and heat affected area HAZ: negative 525 millivolts, weld seam: negative 531 millivolts.It is all little that welding point is respectively distinguished potential difference, illustrates that welding wire of the present invention and welding high-weatherability can have the superior corrosion resistance energy by W400QN steel grade matched junction.The weld seam combination property satisfies speed-raising locomotive welding matching technique condition of new generation.
Embodiment 3: utilize 0.5 ton of this welding wire of electric furnace smelting, dial into welding wire gage of wire 1.2mm, copper coating with drawing through rolling.The chemical composition of its composition (weight %) is: C:0.10, and Si:0.70, Mn:1.53, S:0.006, P:0.007, Ni:0.95, Cr:0.40, Ti:0.17, B:0.007, Cu:0.40, Als:0.005, all the other inevitably are mingled with other for Fe.Welding wire adopts rich argon mixture gas (80%Ar+20%CO
2) as protective gas, the thickness of slab of its welding A710 is 12mm, the main chemical compositions of its A710 steel grade (weight %) C :≤0.07, Si :≤0.40; Mn :≤0.70, Cu:1.0-1.30, Cr:0.6-0.90; Ni:0.70-1.0, P :≤0.020, S :≤0.010.Mechanical performance ReL=590MPa, Rm=685Mpa, Akv (40 ℃)=260J, Akv (80 ℃)=180J.Welding procedure is a Y type groove.Root face is 1mm, and bevel angle is 60 °, and welding condition is welding current 240～260A, and weldingvoltage～27V welds fast 29cm/min.The welding point tension test is broken at base material, positive recurvation d=3a, and 180 ° are qualified, and tensile strength, the cold-bending property of welding point are good.Weld seam ballistic work Akv (60 ℃)=105J, Akv (80 ℃)=103J.Vertically dock test plate (panel) melt run Akv (60 ℃)=96J, Akv (80 ℃)=89J, heat affected area ballistic work Akv (60 ℃)=197J, Akv (80 ℃)=181J.Seam organization is mainly pro-eutectoid ferrite+intracrystalline acicular ferrite, and the overheated zone is organized as bainite structure.Weld seam three districts have higher low-temperature impact toughness, and joint has good welding technological properties and good cryogenic property.Full welding line joint corrosive nature test has adopted 2 samples to carry out joint electrochemical corrosion test altogether.Experimental condition and result of the test: weld joint samples is polished, and through 3% nitric acid alcohol etch, makes the naked eyes can clear resolution base material-heat affected area HAZ-weld seam.Each district makes reference with calomel electrode, at room temperature, adopts the microcell electrochemical techniques.In 3%NaCl solution, record when stablizing 2 minutes and respectively distinguish corrosion potential.Base material electrochemical corrosion test welding point is respectively distinguished current potential: base material: negative 545 millivolts, and heat affected area HAZ: negative 535 millivolts, weld seam: negative 533 millivolts.It is all little that welding point is respectively distinguished potential difference, illustrates that welding wire of the present invention and A710 steel matched junction have the superior corrosion resistance energy.The weld seam combination property satisfies A710 steel welding matching technique condition.
Claims (1)
1, the high weather-proof gas shield welding wire of high-intensity high-tenacity, the chemical composition (weight %) that it is characterized in that forming this welding wire is: C:0.04～0.12, Si:0.40～0.80, Mn:1.40～2.0, P≤0.020, S≤0.015, Ni:0.40～1.0, Cr:0.20～0.50, Ti:0.06～0.20, Cu:0.30～0.50, B:0.002～0.0079, Als≤0.02, surplus are that Fe inevitably is mingled with other.
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| CN107350657A (en) * | 2017-05-27 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | Weld railway vehicle dynamics gas protecting welding wire |
| CN107414341A (en) * | 2017-07-29 | 2017-12-01 | 安徽华众焊业有限公司 | A kind of small solid welding wire that splashes |
| CN110802343A (en) * | 2019-11-12 | 2020-02-18 | 钢铁研究总院 | High-performance weather-resistant welding rod for coating-free weather-resistant bridge steel |
| CN115178839A (en) * | 2022-07-14 | 2022-10-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bending performance of QStE steel plate welded joint |
| CN115178839B (en) * | 2022-07-14 | 2024-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving bending performance of QSTE steel plate welded joint |
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| CN1290661C (en) | 2006-12-20 |
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