CN105798481A - Weather-proof gas protection welding wire for coating-free weather-proof steel bridge - Google Patents
Weather-proof gas protection welding wire for coating-free weather-proof steel bridge Download PDFInfo
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- CN105798481A CN105798481A CN201610366745.9A CN201610366745A CN105798481A CN 105798481 A CN105798481 A CN 105798481A CN 201610366745 A CN201610366745 A CN 201610366745A CN 105798481 A CN105798481 A CN 105798481A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
Abstract
The invention provides a weather-proof gas protection welding wire for a coating-free weather-proof steel bridge, and belongs to the field of welding materials. According to the technical scheme, in the weather-proof gas protection welding wire for the coating-free weather-proof steel bridge, chemical components comprise the basic component Fe, and the welding wire is further prepared from, by mass percent, 0.03%-0.10% of C, 0.30%-0.50% of Si, 1.20%-1.60% of Mn, not larger than 0.012% of P, not larger than 0.005% of S, 0.30%-0.60% of Cr, 0.20%-0.50% of Ni, 0.20%-0.50% of Cu, 0.005%-0.025% of Ca and 0.005%-0.05% of Re. The welding wire is used for welding of weather-proof bridge steel, the strength of extension of deposited metal is high, the yield strength is high, the elongation is larger than or equal to 24%, and the low temperature impact resisting performance and the atmosphere corrosion resisting performance are excellent; and the welding wire is easy to manufacture and suitable for being popularized on a large scale.
Description
Technical field
The invention belongs to field of welding material, be specifically related to one and exempt from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, be particularly suited for the gas shielded welding of yield strength 345 ~ 460MPa rank weather-resistant steel plate.
Background technology
Move forward steadily under the Strategic Context of " with a road " and " Regional Synergetic development " in China, relate to bridge safty and the new design of durability, construction, product and application technology receive much concern.Exempt from the weather-proof steel bridge of application using homeostasis densification rusty scale as surfacecti proteon, compared with common application steel bridge, the technology economy advantage such as there is easy maintenance, environmental protection, construction period is short, integrated cost is low, it is an important development direction of high-performance bridge, has accumulated built seat up to ten thousand in beautiful, Deng state.Domestic accelerate the popularization and application exempting from application Weather-resistance bridge steel especially; but exempt from application weathering steel structure and Qiang Zhiyaoqiu the supporting weather-proof wlding of employing during fabrication; but currently without disclosure satisfy that the welding variety of demand; also without the relevant criterion of Weather-resistance bridge steel gas protecting welding wire in national standard; cause wlding to produce, use confusion; Weather-resistance bridge performance can not be guaranteed, and carrys out very big economic loss to bridge industrial belt.
Weather-proof index I is the important parameter characterizing ferrous materials atmospheric corrosion resistance ability, exempts from application high-performance weather-proof steel bridge and generally requires weather-proof index I >=6.5 of weathering steel used.Research shows, weather-proof index I high weather resistance steel in 6.5 ~ 6.9 scopes, and its atmospheric corrosion resistance ability more weather-proof index I common weathering steel in 6.0 ~ 6.3 scopes improves 1.5 times.Exempt from the weather-proof steel bridge of application according to common weather-proof welding wire welding manufacture, the weather resistance of welded seam area can not with mother metal matched well, uneven chemical components causes galvanic corrosion, and welding point region can be made to become the weak area of corrosion, it is impossible to meet the design and use requirement exempting from the weather-proof steel bridge of application.
The TH500-NQ-II of regulation in " rail truck weather resisting steel and stainless steel welding material " (TB/T2374-2008) standard, II two kinds of weather-resistant gas-shielded solder wires of TH550-NQ-, special for rail truck, in this standard, the deposited metal ballistic work of regulation is not less than railway freight-car steel standard, i.e. AKV (-40 DEG C) >=60J, by the wlding that this standard provides, comment in test and actual welding process in the weldering of Weather-resistance bridge steel and performance inconsistency lattice problem easily occurs, the surplus capacity of its deposited metal ballistic work is often less than normal, can not stably meet the welding requirements of Weather-resistance bridge steel construction；Above-mentioned standard also requires relatively corrosive rate≤10% of railway freight-car steel weld metal and mother metal, and the weather-proof index I of relevant wlding deposited metal is about 6.0, suitable with the I index of railway freight-car weathering steel.But, the requirement of atmospheric corrosion resistance is higher than railway freight-car weathering steel by Weather-resistance bridge steel, require atmospheric corrosion resistance sex index (weather-proof index) I >=6.0 calculated according to chemical composition, more it is strict with and is, the area of rusty scale stability may be damaged at atmospheric corrosion environment, exempt from weather-proof index I >=6.5 of application weather-proof steel bridge weathering steel, wlding and welding point, now, if Weather-resistance bridge steel is still by above-mentioned standard application wlding, its weld metal zone will become the weak area of corrosion, it is impossible to meets the high-performance weatherable bridge steel requirement to atmospheric corrosion resistance.
At present; for improving the weather resistance of welding wire; the elements such as Cr, Ni, Cu are added often in welding wire; application number 200810047484.X; the Chinese patent of notification number CN101357425B discloses one " weather resistance steel argon-rich gas shielded welding wire for high-intensity railway "; containing Cu:0.20 ~ 0.35%, Cr:0.30 ~ 0.70%, Ni:0.20 ~ 0.60% in its composition (mass percent)；Application number 200310108200.0, a kind of weather-resistant gas-shielded solder wire of the patent disclosure of publication number CN1301825C, in its composition (mass percent) containing Cu:0.10 ~ 0.60%, Cr:0.30 ~ 0.90%, Ni:0.20 ~ 0.60%；Application number 200410013357.X, a kind of high strength high tenacity high weather resistant gas protecting welding wire of the patent disclosure of publication number CN1290661C, in its component of weld wire, Ni content is 0.40 ~ 1.00%；Application number 201310617204.5, a kind of high-strength weathering steel gas shield solid core welding wire of the patent disclosure of publication number CN103600178A, in its component of weld wire, Ni content is 0.65 ~ 0.95%, Cr content is 0.90 ~ 1.25%；Application number 201310057555.5, the patent disclosure of the publication number CN103111772A weather-proof gas shield welding wire of a kind of excellent in low temperature toughness, in its component of weld wire, Ni content is 1.8 ~ 3.5%.
But there is bigger deficiency in above-mentioned welding wire, on the one hand, do not consider that the alloying elements such as Si, Cr, Ni add the problem making welding pool mobility reduce, research shows, in welding pool, Cr, Ni alloying element content is higher can reduce molten bath mobility, the Si in welding wire when being transitioned into weld seam with dystectic oxide particle SiO2Exist, also welding pool viscosity can be made to increase, mobility reduces, the effusion speed that can cause the gases such as hydrogen in weld seam, nitrogen, carbon dioxide is slack-off, weld seam and Jin Feng district residual hydrogen content raise, cause hydrogen embrittlement and delayed crack, the nitrogen and the carbon dioxide that remain in weld seam may also result in pore, additionally, mobility reduction in molten bath causes nonmetal inclusion in weld seam to get rid of difficulty, and low-temperature flexibility reduces, also result in chemical composition in weld seam can not uniformly spread, producing weld seam segregation, and then cause fire check, butt welded seam forming property and metallurgical quality have a significant impact；On the other hand, the weather-proof index I calculated according to chemical composition is not all measured by above-mentioned patent, causes that application is limited.
As fully visible, developing supporting weather-proof wlding is Weather-resistance bridge steel bridge important technological problems urgently to be resolved hurrily.
Summary of the invention
Poor for solving existing gas protecting welding wire weather resistance; the technical problem of Weather-resistance bridge steel welding requirements can not be met; the present invention provides one to exempt from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application; technical scheme by scientific matching chemical composition; achieve welding wire good with high-performance weather-proof steel mother metal matching; deposited metal tensile strength is more than 500MPa, excellent in low temperature toughness ,-40 DEG C of ballistic work KV2More than 100J, weather-proof index I, more than 6.5, substantially increases its weather resistance.
The technical solution used in the present invention is: one exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application; chemical composition includes basic ingredient Fe, and described welding wire also includes the chemical composition of following mass percent: C:0.03 ~ 0.10, Si:0.30 ~ 0.50; Mn:1.20 ~ 1.60; P≤0.012, S≤0.005, Cr:0.30 ~ 0.60; Ni:0.20 ~ 0.50; Cu:0.20 ~ 0.50, Ca:0.005 ~ 0.025, Re:0.005 ~ 0.05.
Preferably, the chemical composition mass percent of described welding wire is: C:0.03 ~ 0.10, Si:0.30 ~ 0.50, Mn:1.20 ~ 1.60, P≤0.012, S≤0.005, Cr:0.30 ~ 0.60, Ni:0.20 ~ 0.50, Cu:0.20 ~ 0.50, Mo:0.08 ~ 0.20, Ca:0.005 ~ 0.025, Zr:0.005 ~ 0.05, Re:0.005 ~ 0.05, surplus is Fe.
The mass percent of described Zr is 0.01 ~ 0.03.
In described welding wire, the proportioning between Si, Cr, Ni, Zr, Re content meets Ca+Zr+Re >=0.02 (Si+Cr+Ni).
The mass percent of described Cr is 0.45 ~ 0.55.
The mass percent of described Ni is 0.35 ~ 0.45.
The mass percent of described Cu is 0.30 ~ 0.40.
Atmospheric corrosion resistance index I >=6.5 that described welding wire calculates according to chemical composition, wherein:
I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P)-33.39(%Cu)2。
Described Re is Ce, La, Pr or Nd.
Described gas is argon-rich gas, and percent by volume is that Ar accounts for 80 ~ 95%, by CO2And O2The mixing gas of composition accounts for 5 ~ 20%.
In technique scheme, effect and the mechanism of each component of welding wire are as follows:
C: be the main intensified element of weld seam, the hardness of weld metal, yield strength, tensile strength all improve with the increase of C content, C content is controlled 0.03 ~ 0.10% by the present invention, is owing to C content increased the low-temperature impact toughness and atmospheric corrosion resistance being unfavorable for steel at most；
Si:Si and Cu, Cr, P are with the use of the weather resistance that can improve steel, realize mainly through increasing and refining alpha-feooh, Si can play the effect of solution strengthening and deoxidation, and Si content controls 0.30 ~ 0.50%, when Si content is more than 0.50%, toughness is harmful to；
Mn:Mn can improve intensity and the toughness of weld metal, and the Mn in welding wire may also operate as the effect of deoxidation, controls 1.20 ~ 1.60% with S MnS, the Mn content reacting generation stable, has the effect of heat resistanceheat resistant crackle and the lamellar tearing ability improving weld metal；
S and P:S and P is harmful element, severe exacerbation Weld Performance, reduces impact flexibility, causes weld seam hot tearing, will strictly control S and P content, therefore it is required that S≤0.005% in welding wire, P≤0.012%；
Cr:Cr can form the oxide-film of densification on the surface of steel, promote electrode potential, produce passivation effect, improve atmospheric corrosion resistance, and the intensity of weld metal increases with Cr content and raises, but when Cr content is more than 0.50%, increase with Cr content, generate ferrite side plate, welding seam toughness is made to worsen, Cr too high levels makes molten bath viscosity improve on the other hand, mobility reduces, add the probability of weld metal pore and field trash, therefore Cr content controls 0.30 ~ 0.60%, both atmospheric corrosion resistance and the intensity of weld metal had been ensured, avoid again the decline of mobility；
Ni:Ni dramatically increases the compactness of rusty scale in weld metal, mainly with NiFe2O4It is present in spinel oxides, makes the corrosion potential of steel shuffle；Ni can significantly improve the low-temperature impact toughness of weld seam simultaneously, it addition, Ni can also improve the Cu weld seam decrepitation caused；But, Ni too high levels makes molten bath viscosity improve, and mobility reduces, and should not add.Therefore Ni content is controlled 0.20 ~ 0.50% by the present invention；
Cu:Cu effect in weld seam is relevant with its content, when in weld seam, Cu content is below 0.85%, atmospheric corrosion resistance can be improved, also intensity and the impact flexibility of welding point can be improved, but Cu too high levels is easily caused weld seam there is fire check, therefore in the present invention controls Cu content 0.20 ~ 0.50%；
Ca:Ca, in the melt tank reaction stage of weld seam, forms calciate with refractory metal, reduces molten bath viscosity, improves molten bath mobility.Additionally, add Ca and can reach the effect of deoxidation, desulfurization, dephosphorization and removal trace harmful elements, oxide and sulfide nodularization is made by Ca process, both weld seam impact toughness can have been improved, the cool attenuation of weld metal can be reduced again, in weld seam, the Ca containing trace just can play above-mentioned effect, in the present invention controls the weight percent content of Ca 0.005 ~ 0.025%；
Re:Re and rare earth element, control 0.005 ~ 0.05% by the weight percent content of Re in the present invention, Re2O3Field trash in Resistance of Weld Metal has nodularization, refining effect, it is possible to improve welding heat affected toughness；Re2O3Diffusible hydrogen content in weld seam can also be reduced, reduce the impurity contents such as H, S, reduce the hydrogen induced cracking sensitivity of weld seam；Meanwhile, Re2O3The mobility of molten pool metal can be improved, it is to avoid pore and the generation being mingled with in weld seam.
In the technical scheme improved further, with the addition of Mo and Zr:Mo element and be enriched with in rusty scale, it is possible to improve rusty scale compactness, improve weld metal atmospheric corrosion resistance；It addition, Mo substantially shortens the stage of incubation of middle temperature transformation, be conducive to acquisition acicular ferrite structure under wider postwelding cooling condition, improve the obdurability of weld metal.But, Mo is noble element, adds, and cost increases accordingly, in the present invention controls Mo content 0.02 ~ 0.10%；
Zr: in the present invention, Zr content controls 0.005 ~ 0.10%, the Zr element of this percentage by weight can pass through solution strengthening and the intensity of precipitation strength effect raising weld seam, is improved the low-temperature flexibility of weld metal by nitrogen fixation；Zr element can make the dystectic field trash in weld metal refine and disperse simultaneously, improves the mobility of weld metal, reduces diffusible hydrogen content in weld seam, improves the impact property of weld metal further；
The welding wire of the present invention from above-mentioned each chemical composition scientific matching, mutually coordinated, jointly with, solution strengthening effect by alloying elements such as C, Si, Mn, it is effectively ensured the intensity of weld metal, by the toughening effect of Ni element, control P, S constituent content, further increase the obdurability of weld metal.By adding the alloying elements such as Si, Cu, Cr, Ni, it is possible to improve compactness and the stability of weld metal rusty scale, it is ensured that the weather resistance of weld metal.The reasonable interpolation of above alloying element so that the mechanical property of weld metal and weather resistance are all more excellent.In the technical scheme improved further, add Ca, Zr and Re element simultaneously, three kinds of element synergism, be conducive to giving full play to the performance of Ca, Zr, Re element, improve molten bath mobility, improve metallurgical quality and low-temperature impact toughness.The welding wire of the present invention is applicable to Q345qENH～Q460qENH series and exempts from the welding of application Weather-resistance bridge steel and the gas shielded welding of yield strength 345 ~ 460MPa rank weather-resistant steel plate, it is possible to meet the coupling welding instructions for use exempting from application weathering steel.The atmospheric corrosion resistance of welding wire deposited metal is excellent, and more common weather-proof wlding improves 1.5 times, it is possible to realize better mating with exempting from application weathering steel.
The invention has the beneficial effects as follows: the welding wire of (1) present invention when exempting from the welding of application Weather-resistance bridge steel for Q345qENH～Q460qENH series, deposited metal tensile strength >=500MPa, yield strength >=345MPa, percentage elongation >=24% ,-40 DEG C of low-temperature impact work KV2≥100J.(2) welding wire deposited metal atmospheric corrosion resistance index I >=6.5 of the present invention, weld metal and relatively corrosive rate≤10% exempting from application weathering steel mother metal, atmospheric corrosion resistance is excellent, it is adaptable to exempt from design and the welding manufacture of application Weather-resistance bridge steel construction.(3) welding procedure of the present invention is good, and in welding process, arc burning is stable, and the droplet transfer is uniform, and welding bead is attractive in appearance, and weld seam is uniform with the transition of mother metal junction, and appearance of weld is good.(4) welding wire of present invention molten bath mobility in welding process is better, and welding point metallurgical quality is excellent, flawless, pore, slag inclusion, overlap near weld dimensions, the defect such as burns.(5) rationally, the smelting of its wire rod, rolling and drawing welding wire technique easily realize in the soldering wire alloy system regulation and control of the present invention, and steady quality is suitable for large-scale promotion application.
Accompanying drawing explanation
Fig. 1 is the pattern of the typical field trash of the deposited metal that the welding wire of the embodiment of the present invention 3 is formed；
Fig. 2 is the pattern of the typical field trash of the deposited metal that the welding wire of comparative example 2 is formed；
Fig. 3 is the deposited metal typical organization pattern that the welding wire of the embodiment of the present invention 7 is formed；
Fig. 4 is the deposited metal typical organization pattern that the welding wire of comparative example 3 is formed；
Fig. 5 is the typical deposited metal erosion profile that the welding wire of the embodiment of the present invention 4 is formed；
Fig. 6 is the typical deposited metal erosion profile that the welding wire of comparative example 1 is formed.
Detailed description of the invention
The present invention provides one to exempt from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, adopt P, S, gas and the extremely low raw material of inclusion content, the addition of alloy is accurately calculated according to chemical composition, steel for welding wire is smelted with 50Kg vacuum induction furnace, through charging, fusing, after refine, the active element alloys such as Ca and Re are added at alloying, it is cast into steel ingot after composition is qualified, after steel ingot is forged into square billet, it is rolled into Φ 5.5mm wire rod, wire rod is through peeling off, clean, cathodic pickling, clean and after boronation, the welding wire of Φ 0.8～2.0mm is made then through rough silk and finish draw silk, Quality of Final Welding Wire is stable, the method of electroless copper is adopted to carry out welding wire surface copper facing further, copper facing THICKNESS CONTROL is at 0.2 ~ 0.3um, welding wire surface copper facing is not counted in component of weld wire and calculates.Chemical composition proportioning (mass percent) and the weather-proof index I of the specific embodiment of welding wire of the present invention and three kinds of comparative example welding wires are as shown in table 1 below, and wherein specification refers to the specification of diameter.
Table 1 welding wire chemical composition proportioning (mass percent) (surplus is Fe)
In above-mentioned table 1, embodiment 1-7 is the chemical composition proportioning example of welding wire of the present invention, comparative example 1-3 is common weathering steel welding wire TH550-NQ-II, basis formula I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P)-7.29 (%Cu) (%Ni)-9.10 (%Ni) (%P)-33.39 (%Cu) of weather-proof index I in upper table2=26.01 × 0.38+3.88 × 0.36+1.20 × 0.48+1.49 × 0.38+17.28 × 0.008-7.29 × 0.38 × 0.36-9.10 × 0.36 × 0.008-33.39 × 0.38 × 0.38=6.72, the weather-proof index I of visible welding wire of the present invention is in 6.66 ~ 6.92 scopes, and the weather-proof index I of comparative example welding wire is in 6.02 ~ 6.31 scopes.
Above-mentioned welding wire being used for Q345qENH～Q460qENH series and exempts from the welding of application Weather-resistance bridge steel, test plate (panel) is selected and is exempted from application weather-proof steel bridge 24mm thickness Q420qENH steel plate, with argon-rich gas (80%Ar+20%CO2) as protective gas; adopting above-mentioned welding wire to carry out deposited metal soldering test according to the welding condition of such as table 2 below, the chemical composition of above-mentioned test plate (panel) includes: C0.07%, Si0.32%; Mn1.16%; P0.011%, S0.002%, Cr0.43%; Ni0.35%; Cu0.31%, its weather-proof index I is 6.57, yield strength Rp0.2For 459MPa, tensile strength RmFor 617MPa, elongation percentage is 25% ,-40 DEG C of ballistic work KV2For 273J.Visual examination is carried out after test plate (panel) welding, ultrasonic examination is after the assay was approved, sampling from each deposited metal, deposited metal composition is measured, after the welding of table 1 each welding wire, corresponding deposited metal composition measurement result and the weather-proof index I according to chemical composition calculating are as shown in table 3 below；Sampling from each deposited metal, observe form and the content of statistics field trash, and field trash is graded, rating result is shown in table 4 below；Wherein, in the deposited metal that the welding wire of embodiment 3 is formed, the pattern of typical case's field trash is as shown in Figure 1, in the deposited metal that comparative example 2 welding wire is formed, the pattern of typical case's field trash is as shown in Figure 2, illustrating that in welding wire deposited metal of the present invention, inclusion content is less, field trash type is D class is carefully spherical oxide；Contrast welding wire deposited metal inclusion content is relatively many, and there is D class is slightly spherical oxide.
The deposited metal typical organization pattern that the welding wire of the embodiment of the present invention 7 is formed is as shown in Figure 3, the deposited metal typical organization pattern that comparative example 3 welding wire is formed is as shown in Figure 4, illustrate that welding wire deposited metal organization type of the present invention is mainly tiny acicular ferrite structure, pearlite and granular bainite content are few, and welding wire deposited metal of the present invention has the low-temperature flexibility of excellence；Contrast welding wire deposited metal organization type is acicular ferrite+ferrite side plate, and the low-temperature impact toughness of its deposited metal is relatively low.
The typical deposited metal erosion profile that the welding wire of the embodiment of the present invention 4 is formed is as shown in Figure 5, the typical deposited metal erosion profile that the welding wire of comparative example 1 is formed is as shown in Figure 6, illustrating that the rusty scale that welding wire deposited metal of the present invention is formed is fine and close and stable, atmospheric corrosion resistance is excellent；Contrast welding wire deposited metal rusty scale has blind crack, and be not as fine and close as welding wire deposited metal rusty scale of the present invention, therefore welding wire of the present invention has better atmospheric corrosion resistance.
Table 2 welding condition
In table 3 table 1 each welding wire welding after deposited metal composition and weather-proof index I
Deposited metal field trash grading after the welding of each welding wire in table 4 table 1
From table 3 deposited metal composition measurement result analysis, the weather-proof index I of embodiment 1-7 deposited metal is above 6.5, atmospheric corrosion resistance is excellent, in deposited metal, P, S content all controls at reduced levels, containing a certain amount of Ca, Zr and Re element in deposited metal, advantageously reduce field trash and the air vent content of deposited metal, it is ensured that deposited metal metallurgical quality and mechanical property.The weather-proof index I of comparative example 1-3 deposited metal is below 6.5, and atmospheric corrosion resistance is not as good as the deposited metal of welding wire of the present invention.Without Ca, Zr and Re element in comparative example 1-3 deposited metal, it is impossible to be effectively improved deposited metal mobility and ensure deposited metal metallurgical quality.
By table 4 rating result it can be seen that in welding wire deposited metal of the present invention inclusion content less, field trash type is D class is carefully spherical oxide；In contrast welding wire deposited metal, inclusion content is relatively many, mainly there are sulfide-based (A class), silicates (C class) and spherical oxide class (D class), illustrate that welding wire of the present invention is by adding Ca, Zr and rare earth element, significantly improve deposited metal metallurgical quality, be conducive to improving the low-temperature flexibility of welding point.
Further, from the deposited metal sampling after welding, detect a flaw qualified after carry out tensile property and the test of-40 DEG C of low temperature impact properties.Tensile sample longitudinally intercepts from deposited metal center, it is ensured that parallel length is all made up of deposited metal, and specimen size and test method carry out with reference to GB/T228 regulation.Impact specimen intercepts from deposited metal center, and the impact specimen longitudinal axis is vertical with deposited metal length direction, and breach face is perpendicular to deposited metal surface, and breach axis is positioned at deposited metal center.Specimen size is 10 × 10 × 55mm, and impact test method performs with reference to GB/T229 regulation.Deposited metal tension test and Impulse Test Result are as shown in table 5, are meansigma methods in table bracket.
Deposited metal tensile property and impact property measurement result after the welding of table 5 table 1 each welding wire
Be can be seen that by upper table 5, the deposited metal yield strength of welding wire of the present invention is within the scope of 381 ~ 521MPa, tensile strength is within the scope of 521 ~ 625MPa, elongation percentage is in 24.0 ~ 32.0% scopes, ballistic work is within the scope of 101 ~ 182J, and comprehensive mechanical property is excellent, mates with mother metal obdurability well, meet associated specifications and surplus capacity is bigger；And contrast the deposited metal yield strength of welding wire within the scope of 452 ~ 477MPa, tensile strength is within the scope of 562 ~ 603MPa, elongation percentage is in 22.8 ~ 23.5% scopes, ballistic work is within the scope of 35 ~ 76J, the deposited metal intensity of contrast welding wire can meet mother metal standard-required, but ballistic work is relatively low and fluctuates bigger, it is impossible to meets the requirement to low-temperature flexibility of the Weather-resistance bridge steel, compared with visible and common weather-proof welding wire, the comprehensive mechanical property of welding wire of the present invention has clear superiority.
Sample from weld metal, with reference to TB2375-1993 " railway weathering steel alternate-immersion test method " and TB2374-2008 " rail truck weather resisting steel and stainless steel welding material " standard, adopt the NaHSO of 0.01mol/L3Solution carries out period soaking corrosion accelerated corrosion test, the corrosion behavior under simulation industrial atmospheric environment.Evaluate the air decay resistance of weld metal according to relatively corrosive rate (relatively corrosive rate=(mother metal weightlessness-weld metal is weightless)/mother metal is weightless), result of the test is shown in table 6 below.
The air decay resistance result of the test of table 6 weld metal
Be can be seen that by upper table 6, when simulating industrial atmospheric environment, the weld metal of welding wire of the present invention and the relatively corrosive rate of weathering steel mother metal are in 1% ~ 4% scope, meet the requirement that relatively corrosive rate is not more than 10% by TB2374-2008 standard, illustrate that the atmospheric corrosion resistance of weather-proof welding wire weld metal of the present invention is suitable with mother metal, there is the atmospheric corrosion resistance of excellence.The weld metal of contrast welding wire and the relatively corrosive rate of weathering steel mother metal are in 12 ~ 16% scopes, beyond standard-required, when the employing general weather-proof welding wire welding of application bridge weathering steel is exempted from explanation, the atmospheric corrosion resistance of weld metal is poor compared with mother metal, and under the actual service condition of bridge, weld metal zone may become the weak area of corrosion.Compared with visible and common weather-proof welding wire, the atmospheric corrosion resistance of welding wire of the present invention has clear superiority.
The welding wire of the present invention is suitable to full-argon gas shielded arc welding and connects; can be used for the welding of yield strength 345～460MPa level steel plate; welding procedure is good; the metallurgical quality of welding point and comprehensive mechanical property are excellent; meet " railway steel bridge manufacturing standard " (Q/CR9211-2015) requirement; weld metal atmospheric corrosion resistance index I >=6.5, atmospheric corrosion resistance mates well with exempting from application bridge weathering steel.Welding wire of the present invention disclosure satisfy that the requirement exempted from the design of application weathering steel bridge construction and manufacture, it is also possible to other weathering steel fields such as rail truck, building structure, container that are generalized to use.
Claims (10)
1. exempting from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, chemical composition includes basic ingredient Fe, it is characterised in that; described welding wire also includes the chemical composition of following mass percent: C:0.03 ~ 0.10; Si:0.30 ~ 0.50, Mn:1.20 ~ 1.60, P≤0.012; S≤0.005; Cr:0.30 ~ 0.60, Ni:0.20 ~ 0.50, Cu:0.20 ~ 0.50; Ca:0.005 ~ 0.025, Re:0.005 ~ 0.05.
2. one according to claim 1 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that the chemical composition mass percent of described welding wire is: C:0.03 ~ 0.10; Si:0.30 ~ 0.50, Mn:1.20 ~ 1.60, P≤0.012; S≤0.005, Cr:0.30 ~ 0.60, Ni:0.20 ~ 0.50; Cu:0.20 ~ 0.50; Mo:0.08 ~ 0.20, Ca:0.005 ~ 0.025, Zr:0.005 ~ 0.05; Re:0.005 ~ 0.05, surplus is Fe.
3. one according to claim 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that
The mass percent of described Zr is 0.01 ~ 0.03.
4. one according to claim 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that in described welding wire, the proportioning between Si, Cr, Ni, Zr, Re content meets Ca+Zr+Re >=0.02 (Si+Cr+Ni).
5. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that the mass percent of described Cr is 0.45 ~ 0.55.
6. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that the mass percent of described Ni is 0.35 ~ 0.45.
7. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that the mass percent of described Cu is 0.30 ~ 0.40.
8. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that atmospheric corrosion resistance index I >=6.5 that described welding wire calculates according to chemical composition, wherein:
I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P)-33.39(%Cu)2。
9. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that described Re is Ce, La, Pr or Nd.
10. one according to claim 1 and 2 exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application, it is characterised in that described gas is argon-rich gas, and percent by volume is that Ar accounts for 80 ~ 95%, by CO2And O2The mixing gas of composition accounts for 5 ~ 20%.
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| CN201610366745.9A CN105798481B (en) | 2016-05-30 | 2016-05-30 | One kind exempts from the weather-proof steel bridge weather-resistant gas-shielded solder wire of application |
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| CN106555155A (en) * | 2016-10-13 | 2017-04-05 | 国家电网公司 | It is a kind of to accelerate the stabilized pre-oxidization treatment method of Surface Rust of Weathering Steel |
| CN106956064A (en) * | 2017-03-27 | 2017-07-18 | 中铁宝桥集团有限公司 | A kind of Steel Bridge Q420qENH exempts from the welding method of application weathering steel |
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| CN109128576A (en) * | 2018-10-19 | 2019-01-04 | 内蒙古科技大学 | A kind of welding material of nuclear pressure container steel and preparation method thereof and a kind of welding method |
| CN109719417A (en) * | 2018-12-20 | 2019-05-07 | 天津市永昌焊丝有限公司 | A kind of up to 55kg gas shielded welding of weathering steel steel welding wire |
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| CN111975246A (en) * | 2020-09-02 | 2020-11-24 | 燕山大学 | Coating-free weather-resistant argon-rich gas shielded welding wire with 650 MPa-level tensile strength for steel bridge and wire rod |
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