CN110977240A - Welding rod special for 80 kg-grade weathering steel and production method thereof - Google Patents
Welding rod special for 80 kg-grade weathering steel and production method thereof Download PDFInfo
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- CN110977240A CN110977240A CN201911124426.7A CN201911124426A CN110977240A CN 110977240 A CN110977240 A CN 110977240A CN 201911124426 A CN201911124426 A CN 201911124426A CN 110977240 A CN110977240 A CN 110977240A
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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
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention relates to the field of welding materials, in particular to a welding rod special for 80 kilogram-grade weather-proof bridge steel and a production method thereof, wherein the welding rod comprises the following components: the welding rod produced by the invention has good welding manufacturability such as good slag fluidity, stable electric arc, small splashing, excellent slag removal, beautiful forming and the like, and also has good atmospheric corrosion resistance, crack resistance, plasticity and toughness.
Description
Technical Field
The invention relates to the field of welding materials, in particular to a welding rod special for 80 kg-grade weather-resistant bridge steel and a production method thereof.
Background
Since the country was built, the development of railway bridges in China began from the Wuhan Yangtze river bridge (A3 steel) in 1957, and the bridge passes through the Nanjing Yangtze river bridge (16MnQ), the Jiujiang Yangtze river bridge (15MnVNQ) to the Wuhu Yangtze river bridge (14MnNbQ) in 1998, and passes through four landmark stages, and each stage represents the technical development level and the metallurgical development level of a bridge in an epoch.
With the continuous improvement of the strength grade and the toughness of the steel for bridges in China, the welding performance is continuously improved, and the proper thickness of the steel plate is gradually improved. The steel for railway bridges, the steel for highway bridges and the steel for cross-sea large bridges become the main body of the steel for bridges in China, and the high-performance weather-resistant bridge steel which conforms to the development requirements of the times is the main direction for the development of the steel for bridges in China.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a special welding rod for 80 kg-grade weather-resistant bridge steel and a production method thereof.
The invention is realized by the following technical scheme:
a welding rod special for 80 kg-grade weathering steel comprises: the core wire and wrap up in the coating that covers on the core wire surface, its characterized in that, the core wire is H08GX type core wire, the coating includes according to weight percent: and (3) marble: 35.0% -45%, fluorite: 12.0-18.0%, wollastonite: 1.0% -3.0%, natural rutile: 3.0% -5.0%, electrolytic manganese: 3.0-4.0%, CMC 0.8-1.0%, sodium fluosilicate: 1.0% -4.0%, low-silicon ferrosilicon: 2.0% -7.0%, nickel powder: 5.0% -7.5%, chromium metal: 0.8% -1.0%, ferromolybdenum: 2.0% -5.0%, copper powder: 0.5% -1.0%, iron powder: 18.0% -26.0%, wherein the raw materials of the coating mainly have the following functions:
and (3) marble: decomposing into CaO, MgO and CO under the action of arc heat2The slag-forming and gas-forming material is a common slag-forming and gas-forming material in the manufacture of welding rods, protects welding seams from being oxidized and nitrided, can improve the alkalinity of slag, and has a certain P removing function;
fluorite: a certain amount of fluorite can reduce the surface tension of liquid metal, improve the fluidity of slag and reduce the sensitivity of pores; can remove S, and is combined with hydrogen into HF to be volatilized, thereby reducing white spots of hydrogen;
wollastonite: the slag forming agent has certain slag forming effect, and mainly plays a role in improving the pressure coating performance and increasing the smoothness of powder;
natural rutile: the natural rutile has weak oxidizability and good thermal deslag property, stabilizes electric arc, forms slag and calms a molten pool, so that metal is transited in a fine mist form, the directional welding is better, the weld joint is attractive in forming, and the slag coverage is good;
electrolytic manganese: the alloy can play roles of deoxidation and desulfurization, and can also transit manganese element to the welding line, thereby improving the metal strength of the welding line;
CMC, improving the viscosity of the coating;
sodium fluosilicate: has certain dehydrogenation capacity and simultaneously has the function of improving the press coating property of the medicinal powder;
low-silicon ferrosilicon: the deoxidation effect is realized, the melting of the welding rod is accelerated, the fluidity of slag is improved, the sensitivity of weld pores is reduced, and the weld molding is delicate;
nickel powder: the toughness and strength of the welding seam are improved, and the corrosion resistance is improved;
metallic chromium: the strength and the hardness of the welding seam are improved, and the welding seam has good corrosion resistance under the action of Ni;
ferromolybdenum: the method can promote the grain refinement, prevent the crack sensitivity, eliminate the brittleness of weld metal, obviously improve the impact toughness and simultaneously have the function of improving the weld strength;
copper powder: the corrosion resistance of the welding seam is improved;
iron powder: can accelerate the melting speed of the coating, improve the deposition efficiency and stabilize the electric arc.
Preferably, the weight of the coating is 32-42% of the weight of the core wire.
Preferably, the following are required in percentage by weight:
and (3) marble: CaCO3≥96.0％，S≤0.010％，P≤0.010％；
Fluorite: CaF2≥97.0％，SiO2≤1.5％，CaCO3≤1.5％，S≤0.03％，P≤0.03％；
Wollastonite: SiO 2240-50％，CaO 40-46％，Fe2O3≤0.4％；
Natural rutile: TiO 22≥95.0％，S≤0.03％，P≤0.03％；
Electrolytic manganese: more than or equal to 99.7 percent of Mn, less than or equal to 0.04 percent of C, less than or equal to 0.05 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.010 percent of Si and less than or equal to 0.03 percent of Fe;
CMC:S≤0.10％；
sodium fluosilicate: na (Na)2SiF6≥97.0％，Pb≤0.020％；
Low-silicon ferrosilicon: 42.0 to 47.0 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.70 percent of Mn;
nickel powder: more than or equal to 98.0 percent of Ni, less than or equal to 0.025 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.01 percent of P;
metallic chromium: more than or equal to 99.0 percent of Cr, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.020 percent of Si, and less than or equal to 0.20 percent of Fe;
ferromolybdenum: mo is more than or equal to 55.0 percent, Si is less than or equal to 1.0 percent, S is less than or equal to 0.1 percent, P is less than or equal to 0.05 percent, C is less than or equal to 0.20 percent, Cu is less than or equal to 0.5 percent, Sn is less than or equal to 0.060 percent, and Sb is less than or equal to 0.050 percent
Copper powder: cu is more than or equal to 98.0 percent;
iron powder: fe is more than or equal to 98.0 percent, Si is less than or equal to 0.150 percent, S is less than or equal to 0.020 percent, P is less than or equal to 0.020 percent, C is less than or equal to 0.050 percent, Mn is less than or equal to 0.4 percent, and hydrogen loss is less than or equal to 0.50 percent.
Preferably, the following are required in percentage by weight:
and (3) marble: CaCO396.2％，S 0.008％，P 0.008％；
Fluorite: CaF297.97％，SiO21.26％，CaCO31.12％，S 0.01％，P 0.028％；
Wollastonite: SiO 2248.38％，CaO 41.07％，Fe2O30.23％；
Natural rutile: TiO 2295.78％，S 0.03％，P 0.013％；
Electrolytic manganese: 99.7% of Mn, 0.02% of C, 0.033% of P, 0.001% of S, 0.010% of Si and 0.02% of Fe;
CMC:S 0.08％；
sodium fluosilicate: na (Na)2SiF697.8％，Pb 0.020％；
Low-silicon ferrosilicon: si 44.52%, P0.03%, S0.01%, Mn 0.6%;
nickel powder: 99.8% of Ni, 0.02% of C, 0.01% of S and 0.01% of P;
metallic chromium: cr 99.16%, C0.01%, P0.008%, S0.002%, Si 0.02%, Fe 0.20%;
ferromolybdenum: 55.3% of Mo, 0.48% of Si, 0.09% of S, 0.027% of P, 0.034% of C, 0.2% of Cu, 0.02% of Sn0.02% of Sb
Copper powder: 99.1% of Cu;
iron powder: 98.2 percent of Fe, less than or equal to 0.04 percent of Si, 0.012 percent of S, 0.016 percent of P, 0.02 percent of C, 0.13 percent of Mn and 0.2 percent of hydrogen loss.
Preferably, the H08GX type core wire comprises, in weight percent: less than or equal to 0.080 percent of C, 0.35-0.6 percent of Mn, less than or equal to 0.3 percent of Si, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, and the balance of Fe.
The production method of the welding rod special for 80 kg-grade weathering steel is characterized by comprising the following steps:
a. baking fluorite at 550 ℃ for 2 hours for dehydration, and baking rutile at 900 ℃ for 2 hours for dehydration;
b. the raw materials of the coating are put into a V-shaped stirrer according to the proportion and mixed evenly, then water glass with the weight of 18-24% of the coating is added as a binder and stirred evenly, the mixture is put into an oil press to be wrapped on the surface of a core wire, and then the welding rod is prepared after low-temperature, medium-temperature and high-temperature baking.
Preferably, the low temperature is 50-70 ℃, the medium temperature is 100-150 ℃, and the high temperature is 360-380 ℃.
Preferably, the water glass is potassium-sodium water glass with the concentration of 41.5-42.5%.
The invention has the beneficial effects that:
the welding rod produced by the invention has good welding manufacturability such as good slag fluidity, stable electric arc, small splashing, excellent slag removal, beautiful forming and the like, and also has good atmospheric corrosion resistance, crack resistance, plasticity and toughness.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.
Example 1
Taking CaCO396.2 percent of marble, 0.008 percent of S and 35kg of marble with the content of P0.008 percent;
containing CaF297.97％，SiO21.26％，CaCO314kg of fluorite with the weight percentage of 1.12 percent, S0.01 percent and P0.028 percent;
containing SiO248.38％，CaO 41.07％，Fe2O33kg of 0.23% wollastonite;
containing TiO295.78 percent of natural rutile, 0.03 percent of S and 0.013 percent of P, and 4kg of natural rutile;
4.5kg of electrolytic manganese containing 99.7 percent of Mn, 0.02 percent of C, 0.033 percent of P, 0.001 percent of S, 0.010 percent of Si and 0.02 percent of Fe;
CMC0.8kg containing 0.08% of S;
containing Na2SiF697.8 percent of sodium fluosilicate with the Pb content of 0.020 percent, and 2kg of sodium fluosilicate;
6kg of low-silicon ferrosilicon containing 44.52% of Si, 0.03% of P, 0.01% of S and 0.6% of Mn;
6kg of nickel powder containing 99.8% of Ni, 0.02% of C, 0.01% of S and 0.01% of P;
1kg of metal chromium containing 99.16% of Cr, 0.01% of C, 0.008% of P, 0.002% of S, 0.02% of Si and 0.20% of Fe;
4kg of ferromolybdenum containing 55.3 percent of Mo, 0.48 percent of Si, 0.09 percent of S, 0.027 percent of P, 0.034 percent of C, 0.2 percent of Cu, 0.02 percent of Sn0 and 0.02 percent of Sb;
0.3kg of copper powder containing 99.1 percent of Cu;
contains Fe 98.2%, Si not more than 0.04%, S0.012%, P0.016%, C0.02%, Mn 0.13%, and iron powder 21kg with hydrogen loss 0.2%,
baking fluorite at 550 ℃ for 2 hours for dehydration, baking rutile at 900 ℃ for 2 hours for dehydration, putting the powder into a V-shaped stirrer for uniform mixing, then adding 20kg of sodium potassium water glass with the concentration of 41.5-42.5%, uniformly stirring to obtain a mixture, then putting the mixture into an oil press for wrapping the mixture on the surface of a core wire, and then baking the mixture at low temperature of 50-70 ℃, baking the mixture at medium temperature of 100-150 ℃ and baking the mixture at high temperature of 360-380 ℃ to finally prepare the special welding rod for 80 kg-grade weathering steel.
The 80 kg-level weather-proof bridge steel obtained in the embodiment is matched with a special welding rod for full-fusion value welding test, and has the advantages of stable electric arc, good slag fluidity, small splashing, excellent slag removal, attractive forming and deposited metal components: 0.037% of C, 1.64% of Mn, 0.50% of Si, 0.011% of S, 0.018% of P, 0.43% of Cr, 2.76% of Ni, 0.52% of Mo, 0.22% of Cu and the balance of inevitable impurities.
The mechanical properties of the deposited metal at normal temperature in a welding state are as follows: rm 850MPa, Rp0.2736Mpa, A18%, impact KV at-40 deg.C2The values are respectively: 89J, 90J, 92J.
The corrosion of the deposited metal is qualified by peripheral immersion and the radiographic inspection is qualified.
Example 2
Taking CaCO396.2 percent of marble, 0.008 percent of S and 36kg of marble with the weight percentage of P0.008 percent;
containing CaF297.97％，SiO21.26％，CaCO316kg of fluorite with the weight percentage of 1.12 percent, S0.01 percent and P0.028 percent;
containing SiO248.38％，CaO 41.07％，Fe2O32kg of 0.23% wollastonite;
containing TiO295.78 percent of natural rutile, 0.03 percent of S and 0.013 percent of P, and 5kg of natural rutile;
5kg of electrolytic manganese containing 99.7 percent of Mn, 0.02 percent of C, 0.033 percent of P, 0.001 percent of S, 0.010 percent of Si and 0.02 percent of Fe;
CMC0.8kg containing 0.08% of S;
containing Na2SiF697.8％，Pb2kg of 0.020% sodium fluosilicate;
5.5kg of low-silicon ferrosilicon containing 44.52% of Si, 0.03% of P, 0.01% of S and 0.6% of Mn;
7kg of nickel powder containing 99.8% of Ni, 0.02% of C, 0.01% of S and 0.01% of P;
1kg of metal chromium containing 99.16% of Cr, 0.01% of C, 0.008% of P, 0.002% of S, 0.02% of Si and 0.20% of Fe;
4kg of ferromolybdenum containing 55.3 percent of Mo, 0.48 percent of Si, 0.09 percent of S, 0.027 percent of P, 0.034 percent of C, 0.2 percent of Cu, 0.02 percent of Sn0 and 0.02 percent of Sb;
0.3kg of copper powder containing 99.1 percent of Cu;
contains Fe 98.2%, Si not more than 0.04%, S0.012%, P0.016%, C0.02%, Mn 0.13%, and Fe powder 18kg with hydrogen loss 0.2%,
baking fluorite at 550 ℃ for 2 hours for dehydration, baking rutile at 900 ℃ for 2 hours for dehydration, putting the powder into a V-shaped stirrer for uniform mixing, then adding 20kg of sodium potassium water glass with the concentration of 41.5-42.5%, uniformly stirring to obtain a mixture, then putting the mixture into an oil press for wrapping the mixture on the surface of a core wire, and then baking the mixture at low temperature of 50-70 ℃, baking the mixture at medium temperature of 100-150 ℃ and baking the mixture at high temperature of 360-380 ℃ to finally prepare the special welding rod for 80 kg-grade weathering steel.
The 80 kg-level weather-proof bridge steel obtained in the embodiment is matched with a special welding rod for full-fusion value welding test, and has the advantages of stable electric arc, good slag fluidity, small splashing, excellent slag removal, attractive forming and deposited metal components: 0.039% of C, 1.60% of Mn, 0.45% of Si, 0.011% of S, 0.018% of P, 0.43% of Cr, 2.72% of Ni, 0.54% of Mo, 0.23% of Cu and the balance of inevitable impurities.
The mechanical properties of the deposited metal at normal temperature in a welding state are as follows: rm 802MPa, Rp0.2723Mpa, A19%, impact KV at-40 deg.C2The values are respectively: 90J, 91J, 89J.
The corrosion of the deposited metal is qualified by peripheral immersion and the radiographic inspection is qualified.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A welding rod special for 80 kg-grade weathering steel comprises: the core wire and wrap up in the coating that covers on the core wire surface, its characterized in that, the core wire is H08GX type core wire, the coating includes according to weight percent: and (3) marble: 35.0% -45%, fluorite: 12.0-18.0%, wollastonite: 1.0% -3.0%, natural rutile: 3.0% -5.0%, electrolytic manganese: 3.0-4.0%, CMC 0.8-1.0%, sodium fluosilicate: 1.0% -4.0%, low-silicon ferrosilicon: 2.0% -7.0%, nickel powder: 5.0% -7.5%, chromium metal: 0.8% -1.0%, ferromolybdenum: 2.0% -5.0%, copper powder: 0.5% -1.0%, iron powder: 18.0 to 26.0 percent.
2. The welding rod special for 80 kg weathering steel according to claim 1, characterized in that the weight of the coating is 32-42% of the weight of the core wire.
3. The welding rod special for 80 kg weathering steel according to claim 1, characterized in that, calculated by weight percentage, the requirements are:
and (3) marble: CaCO3≥96.0％，S≤0.010％，P≤0.010％；
Fluorite: CaF2≥97.0％，SiO2≤1.5％，CaCO3≤1.5％，S≤0.03％，P≤0.03％；
Wollastonite: SiO 2240-50％，CaO 40-46％，Fe2O3≤0.4％；
Natural rutile: TiO 22≥95.0％，S≤0.03％，P≤0.03％；
Electrolytic manganese: more than or equal to 99.7 percent of Mn, less than or equal to 0.04 percent of C, less than or equal to 0.05 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.010 percent of Si and less than or equal to 0.03 percent of Fe;
CMC:S≤0.10％；
sodium fluosilicate: na (Na)2SiF6≥97.0％，Pb≤0.020％；
Low-silicon ferrosilicon: 42.0 to 47.0 percent of Si, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.70 percent of Mn;
nickel powder: more than or equal to 98.0 percent of Ni, less than or equal to 0.025 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.01 percent of P;
metallic chromium: more than or equal to 99.0 percent of Cr, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of P, less than or equal to 0.02 percent of S, less than or equal to 0.020 percent of Si, and less than or equal to 0.20 percent of Fe;
ferromolybdenum: mo is more than or equal to 55.0 percent, Si is less than or equal to 1.0 percent, S is less than or equal to 0.1 percent, P is less than or equal to 0.05 percent, C is less than or equal to 0.20 percent, Cu is less than or equal to 0.5 percent, Sn is less than or equal to 0.060 percent, and Sb is less than or equal to 0.050 percent
Copper powder: cu is more than or equal to 98.0 percent;
iron powder: fe is more than or equal to 98.0 percent, Si is less than or equal to 0.150 percent, S is less than or equal to 0.020 percent, P is less than or equal to 0.020 percent, C is less than or equal to 0.050 percent, Mn is less than or equal to 0.4 percent, and hydrogen loss is less than or equal to 0.50 percent.
4. The welding rod special for 80 kg weathering steel according to claim 3, characterized in that, calculated by weight percentage, the requirements are:
and (3) marble: CaCO396.2％，S 0.008％，P 0.008％；
Fluorite: CaF297.97％，SiO21.26％，CaCO31.12％，S 0.01％，P 0.028％；
Wollastonite: SiO 2248.38％，CaO 41.07％，Fe2O30.23％；
Natural rutile: TiO 2295.78％，S 0.03％，P 0.013％；
Electrolytic manganese: 99.7% of Mn, 0.02% of C, 0.033% of P, 0.001% of S, 0.010% of Si and 0.02% of Fe;
CMC:S 0.08％；
sodium fluosilicate: na (Na)2SiF697.8％，Pb 0.020％；
Low-silicon ferrosilicon: si 44.52%, P0.03%, S0.01%, Mn 0.6%;
nickel powder: 99.8% of Ni, 0.02% of C, 0.01% of S and 0.01% of P;
metallic chromium: cr 99.16%, C0.01%, P0.008%, S0.002%, Si 0.02%, Fe 0.20%;
ferromolybdenum: 55.3% of Mo, 0.48% of Si, 0.09% of S, 0.027% of P, 0.034% of C, 0.2% of Cu, 0.02% of Sn, 0.02% of Sb
Copper powder: 99.1% of Cu;
iron powder: 98.2 percent of Fe, less than or equal to 0.04 percent of Si, 0.012 percent of S, 0.016 percent of P, 0.02 percent of C, 0.13 percent of Mn and 0.2 percent of hydrogen loss.
5. The welding rod special for 80 kg weathering steel according to claim 1, characterized in that the H08GX type core wire comprises by weight percent: less than or equal to 0.080 percent of C, 0.35-0.6 percent of Mn, less than or equal to 0.3 percent of Si, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, and the balance of Fe.
6. The production method of the welding rod special for 80 kg-grade weathering steel is characterized by comprising the following steps:
a. baking fluorite at 550 ℃ for 2 hours for dehydration, and baking rutile at 900 ℃ for 2 hours for dehydration;
b. the raw materials of the coating are put into a V-shaped stirrer according to the proportion and mixed evenly, then water glass with the weight of 18-24% of the coating is added as a binder and stirred evenly, the mixture is put into an oil press to be wrapped on the surface of a core wire, and then the welding rod is prepared after low-temperature, medium-temperature and high-temperature baking.
7. The method for producing the welding rod special for 80 kg-level weathering steel as claimed in claim 6, wherein the low temperature is 50-70 ℃, the medium temperature is 100-150 ℃, and the high temperature is 360-380 ℃.
8. The method for producing the special welding rod for 80 kg-grade weathering steel as claimed in claim 6, characterized in that the water glass is potassium-sodium water glass with concentration of 41.5-42.5%.
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| CN111604616A (en) * | 2020-06-18 | 2020-09-01 | 昂科万德(武汉)科技有限公司 | 600 MPa-level fire-resistant weather-resistant steel welding rod and preparation method thereof |
| CN112475660A (en) * | 2020-11-20 | 2021-03-12 | 天津大桥龙兴焊接材料有限公司 | Wear-resistant surfacing welding electrode and preparation method thereof |
| CN112496594A (en) * | 2020-11-24 | 2021-03-16 | 天津大桥龙兴焊接材料有限公司 | Low-alloy heat-resistant welding rod capable of resisting crater microcrack and preparation method thereof |
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| CN112475660A (en) * | 2020-11-20 | 2021-03-12 | 天津大桥龙兴焊接材料有限公司 | Wear-resistant surfacing welding electrode and preparation method thereof |
| CN112496594A (en) * | 2020-11-24 | 2021-03-16 | 天津大桥龙兴焊接材料有限公司 | Low-alloy heat-resistant welding rod capable of resisting crater microcrack and preparation method thereof |
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