CN111408857A - Treatment method for weather-resistant steel welding seam - Google Patents
Treatment method for weather-resistant steel welding seam Download PDFInfo
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- CN111408857A CN111408857A CN201911359813.9A CN201911359813A CN111408857A CN 111408857 A CN111408857 A CN 111408857A CN 201911359813 A CN201911359813 A CN 201911359813A CN 111408857 A CN111408857 A CN 111408857A
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
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Abstract
The invention relates to the field of weathering steel treatment, in particular to a treatment method for a weathering steel weld joint. The method comprises the following steps: coating a coating at a welding seam of the weathering steel, and blowing by hot air to form a cured layer; carrying out secondary welding on the welding seam by utilizing laser welding to form a secondary welding seam layer; and spraying an oxidizing solution on the secondary welding seam layer to form an outer oxidizing layer. The treatment method is simple and efficient; the corrosion resistance of the weld joint of the weathering steel treated by the method is obviously improved; the formed new welding seam layer has good mechanical property and is stably combined with the parent metal; can effectively inhibit the problem of corrosion diffusion.
Description
Technical Field
The invention relates to the field of weathering steel treatment, in particular to a treatment method for a weathering steel weld joint.
Background
Weathering steels are a class of alloy steels that form a relatively dense rust layer on the surface after several years of outdoor exposure and thus do not require painting for protection. Weathering steels are best known under the trade name "COR-TEN" by the acronym "corosion resistance" and "Tensilestrength", so english is often called "corten steel". Different stainless steels can be completely rustless, and the weathering resistant steel only has the surface oxidized and can not go deep into the interior, and has the corrosion-resistant characteristic like copper or aluminum.
The weathering resistance of the weathering steel is caused by the specially designed chemical composition and chemical component distribution, so that a protective layer can be formed on the surface of the material under the influence of environmental weather, and the weathering steel has corrosion resistance and weather resistance compared with most steel types except stainless steel. Specially designed alloy element distribution in the weathering steel provides a protective layer, thereby generating a corrosion inhibition effect. The protective layer on the surface of the weathering steel will grow and regenerate slowly with weather. In short, the steel grade forms a protective layer by generating rusts on the surface.
However, the current weathering steel has a serious problem in use, that is, the weathering steel needs to be assembled and welded when forming a structure such as an electric tower, and the welding is generally carried out by using the same welding rod as that of the weathering steel. However, even for welding rods of the same material, the welded joint still has the problems of serious uneven concentration of components, partial copper precipitation corrosion, loosening and easy damage of the welded joint, and the like, so that the mechanical property and the weather resistance of the welded joint are poor, and the corrosion easily diffuses into the weathering steel, thereby causing decay of the whole weathering steel.
In a conventional plate weathering steel test, the service life of the plate weathering steel can reach 15-20 years, but the service life is often far lower than the service life in the actual process, and the main reason is that in a weathering steel structure such as an electric tower and the like, a large number of welding seams are seriously corroded, so that the whole framework is damaged, the stability is reduced, and potential safety hazards are generated. Therefore, the treatment and research of the weld joint of the weathering steel are necessary.
The reason and solution of weld corrosion in late spring [ J ] general corrosion control (6):10-12. the weld corrosion was studied, and the study also showed that a major cause of severe corrosion in the weld was due to the composition and microstructure of the matrix and the detail of the matrix, creating discrete faults. The study of this region focuses on the difference in electrochemical potential between different regions, resulting in preferential dissolution of the least noble element. Also, this document proposes some processing methods for optimizing the weld. However, the methods mentioned here are of limited optimization and are mainly optimized only in terms of electrochemical corrosion.
The research shows that the rust layer at the welding seam obtained by welding with the conventional common welding material has the problems of uneven thickness and serious corrosion at the welding seam, and if similar or similar welding materials are adopted, an inner rust layer and an outer rust layer are formed at the welding seam, the inner rust layer is compact and can separate out a large amount of alloy elements, but the rust layer cannot play a good protection effect and even can generate a serious problem of diffusion to a steel base material.
Therefore, although studies on corrosion at the weld joint have been made, a solution for effectively suppressing the weld joint corrosion and the corrosion diffusion has not been obtained.
Disclosure of Invention
The invention provides a method for treating a weld joint of weathering steel, which aims to solve the problems that corrosion is easy to occur at the weld joint of the existing weathering steel, innumerable tiny primary batteries are generated due to uneven components, electrochemical corrosion is generated, part of alloy elements are enriched and separated out, or a microstructure and a parent metal are poor in continuity, more pores are easy to corrode, and the like. The invention aims to: firstly, the corrosion resistance of the welding seam of the weathering steel is greatly improved through a proper process; secondly, the problem of corrosion diffusion to the base metal is avoided; and thirdly, improving the bonding strength and the mechanical property of the welding seam.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method for treating a weld joint of weathering resistant steel,
the method comprises the following steps:
1) coating a coating at a welding seam of the weathering steel, and blowing by hot air to form a cured layer;
2) carrying out secondary welding on the welding seam by utilizing laser welding to form a secondary welding seam layer;
3) and spraying an oxidizing solution on the secondary welding seam layer to form an outer oxidizing layer.
In the method, firstly, coating a viscous coating and blowing and curing by hot air to form a coating, wherein the formed coating is used as a new welding material coated outside an original welding seam, then, laser welding is used for irradiating a cured layer, the cured layer is melted by high heat generated by laser, so that the cured layer, an old welding material at the welding seam and a parent metal at the edge of the welding seam are repaired and compounded to generate stable combination, the components of the cured layer are used for filling and reinforcing the welding seam to form a secondary welding seam layer with good corrosion resistance and mechanical property, and finally, an oxidation layer is quickly formed on the surface of the secondary welding seam layer by spraying oxidation liquid, so that the corrosion resistance at the welding seam is further improved.
As a preference, the first and second liquid crystal compositions are,
the coating comprises the following components:
3.0 to 6.5 wt% of silica, 6.5 to 10.5 wt% of alumina sol, 1.2 to 3.6 wt% of Mn3O4、2.1～4.0wt％Fe3O40.9 to 2.8 wt% of Cu, 1.5 to 3.2 wt% of cuprous oxide or cuprous salt and 42 to 48 wt% of Fe2O3And the balance of acidic phosphate ester.
The coating is a preferable and improved special copper-manganese coating, and the coating comprises the following components in percentage by weight:
the silicon dioxide is preferably nano silicon dioxide, a conventional activation process is adopted, active hydroxyl on the surface of the nano silicon dioxide is activated by refluxing with 10 wt% hydrochloric acid, the silicon dioxide mainly serves as a skeleton and has the function of filling pores of a welding seam layer at the original welding seam, the filling effect needs to be realized by matching with acidic phosphate, the acidic phosphate has certain corrosiveness, in the welding process of the weathering steel, a large amount of oxides are generated in the welding seam, rusty layer bubbling is very easy to generate, the rusty layer bubbling cannot protect the welding seam and a base metal, but can easily cause that effective components in the coating are difficult to contact with the welding seam and the base metal, the bubbling is loose and easy to fall off, once the bubbling falls off, an internal base layer or the base metal is very easy to directly expose, and once an oxide film with protective property cannot be further formed in time, serious corrosion is easy to generate, on the other hand, the matching effect between the acidic phosphate and the silicon dioxide is good, the acidic phosphate can be adsorbed on the surfaces of the welding seam and the parent metal to form an adsorption film after being corroded, and the silicon dioxide has more hydroxyl groups after being activated, so that the acidic phosphate and the acidic phosphate can form a composite adsorption film together to play a role in regulating water and air;
the alumina sol mainly achieves the purpose of adjusting the fluidity of the coating, so that the coating is integrally in a sticky state and can be conveniently and uniformly coated on a welding seam, the problem that the coating at the welding seam is not uniform due to the flowing of the coating is solved, the alumina sol and the acidic phosphate are both easy to realize thermosetting at a lower temperature, the alumina sol can further form a compact oxide film, other components in the coating can be effectively and quickly fixed, in addition, the price of the alumina sol is low, and compared with other curing agents, the commercially available AS-200 alumina sol adopted by the invention has small impurity content and can further form a compact protective film layer; mn3O4Cu and Cu+The manganese dioxide crystal of the structure is an oblique spinel type body-centered cubic lattice, the crystal lattice unit is Mn4Mn8O16, the structure is the most stable manganese dioxide structure form, compared with the conventional manganese dioxide crystal, the structure is more stable, the continuity of the formed oxide is stronger, and in the process, the transformation rate of the trimanganese tetroxide is faster, Cu and Cu are more stable, and the transformation rate of the trimanganese tetroxide is higher+The residual univalent copper ions can be doped in manganese dioxide in a solid solution doping manner to form defective oxides, the doping can effectively inhibit the manganese dioxide from being further oxidized, and further form manganese-copper composite oxides with higher compactness, so that the effect of blocking corrosive media can be further realized, and the doped manganese-copper composite oxides can further generate the effect of preventing electron migration, and the occurrence of electrochemical corrosion can be inhibited; the ferroferric oxide is mainly used for adjusting the electrochemical potential of the interface and also has certain effect of inhibiting electrochemical corrosion; ferric oxideThe α -FeOOH phase is easy to further form, and the corrosion resistance effect is good when the formed alloy is matched with other components.
As a preference, the first and second liquid crystal compositions are,
the addition amount of the alumina sol is 8.5-9.5 wt%;
the acidic phosphate ester is butoxyethyl phosphate.
The effect is better by controlling the adding amount of the alumina sol within the range;
the acidic phosphate is an extreme pressure agent type acidic phosphate, and can be used together with metal to better form a film under the condition of laser irradiation, improve the film forming efficiency and the continuity of the film layer, and improve the corrosion resistance of the formed secondary weld seam layer.
As a preference, the first and second liquid crystal compositions are,
hot air blowing is carried out for 5-10 min at 135-160 ℃;
the wind speed of the hot wind is 3-8 m/s.
Tests show that the coating can be cured by hot air blowing at about 120 ℃, but tests show that the coating added with alumina sol has certain viscosity, the thickness of the coating is about 1mm, under the condition of 120-130 ℃, the surface layer of the coating is cured but the inner layer of the coating is cured at low efficiency, so that the coating is easy to have uneven thickness under the action of gravity, and within the temperature range, the coating can be cured quickly and uniformly, and if the temperature is too high, the surface of the coating is quickly oxidized, so that uneven element precipitation is formed, and the quality of the coating is reduced.
As a preference, the first and second liquid crystal compositions are,
the laser welding power is 500-800W, and the laser sweeping speed is 15-25 mm/s.
The power of the handheld laser welding is 500-2000W, the handheld laser welding method can be used for performing laser welding with lower power, but the scanning speed needs to be controlled to be slower, so that the secondary welding seam layer, the original welding seam layer and the base metal can be well compounded.
As a preference, the first and second liquid crystal compositions are,
the oxidizing solution is a 45-55 wt% hydrogen peroxide solution.
The surface of the secondary welding seam layer is oxidized by using a hydrogen peroxide spraying mode, a compact oxide layer is quickly formed, and the problem of element precipitation can be inhibited to a certain extent.
As a preference, the first and second liquid crystal compositions are,
and the spraying of the oxidation liquid is carried out in an atomization spraying mode.
The spraying mode of atomization spraying is more uniform, which is beneficial to forming a compact and continuous oxide film.
As a preference, the first and second liquid crystal compositions are,
the particle size of the atomized liquid drops is 60-100 mu m.
The control of the small particle size of the atomized liquid drops is beneficial to improving the compactness and uniformity of the oxide film.
The invention has the beneficial effects that:
1) the treatment method is simple and efficient;
2) the corrosion resistance of the weld joint of the weathering steel treated by the method is obviously improved;
3) the formed new welding seam layer has good mechanical property and is stably combined with the parent metal;
4) can effectively inhibit the problem of corrosion diffusion.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.
Example 1
A method for treating a weathering steel weld seam, the method comprising the steps of:
1) coating a coating at the welding seam of Q235NHA weathering steel, wherein the coating comprises the following components: 3.0 wt% of activated nano-silica, 6.5 wt% of AS-200 alumina sol, 3.6 wt% of Mn3O4、4.0wt％Fe3O42.8 wt% Cu, 3.2 wt% cuprous oxide and 48 wt% Fe2O3And the balance butoxyethyl phosphate;
blowing with hot air at 135 deg.C and air speed of 8m/s for 10min to form a cured layer;
2) carrying out secondary welding on the welding seam by using laser welding, wherein the laser welding power is 500W, and the laser scanning speed is 15mm/s, so as to form a secondary welding seam layer;
3) spraying 55 wt% hydrogen peroxide solution on the secondary welding seam layer in an atomizing manner, and controlling the particle size of atomized liquid drops to be about 60-80 mu m by adopting a BR-50WH atomizing head to form an outer oxidation layer.
Example 2
A method for treating a weathering steel weld seam, the method comprising the steps of:
1) coating a coating at the welding seam of Q235NHA weathering steel, wherein the coating comprises the following components: 6.5 wt% of activated nano-silica, 10.5 wt% of AS-200 alumina sol, 1.2 wt% of Mn3O4、2.1wt％Fe3O40.9 wt% Cu, 1.5 wt% cuprous oxide and 42 wt% Fe2O3And the balance butoxyethyl phosphate;
blowing with hot air at 160 deg.C and air speed of 3m/s for 5min to form a cured layer;
2) carrying out secondary welding on the welding seam by utilizing laser welding, wherein the laser welding power is 800W, and the laser scanning speed is 25mm/s, so as to form a secondary welding seam layer;
3) spraying 45 wt% hydrogen peroxide solution on the secondary welding seam layer in an atomizing manner, and controlling the grain diameter of atomized liquid drops to be about 60-80 mu m by adopting a BR-50WH atomizing head to form an outer oxidation layer.
Example 3
A method for treating a weathering steel weld seam, the method comprising the steps of:
1) coating the welding seam of Q235NHA weathering steelThe material comprises the following components: 4.5 wt% of activated nano-silica, 8.5 wt% of AS-200 alumina sol, and 3.6 wt% of Mn3O4、3.5wt％Fe3O42.5 wt% Cu, 2.5 wt% cuprous oxide and 45 wt% Fe2O3And the balance butoxyethyl phosphate;
blowing with hot air at 150 deg.C and air speed of 5m/s for 5min to form a cured layer;
2) carrying out secondary welding on the welding seam by utilizing laser welding, wherein the laser welding power is 800W, and the laser scanning speed is 20mm/s, so as to form a secondary welding seam layer;
3) spraying 50 wt% hydrogen peroxide solution on the secondary welding seam layer in an atomizing manner, and controlling the grain diameter of atomized liquid drops to be about 60-80 mu m by adopting a BR-50WH atomizing head to form an outer oxidation layer.
Example 4
A method for treating a weathering steel weld seam, the method comprising the steps of:
1) coating a coating at the welding seam of Q235NHA weathering steel, wherein the coating comprises the following components: 4.5 wt% of activated nano-silica, 9.5 wt% of AS-200 alumina sol, 3.6 wt% of Mn3O4、3.5wt％Fe3O42.5 wt% Cu, 2.5 wt% cuprous oxide and 45 wt% Fe2O3And the balance butoxyethyl phosphate;
blowing with hot air at 150 deg.C and air speed of 5m/s for 5min to form a cured layer;
2) carrying out secondary welding on the welding seam by utilizing laser welding, wherein the laser welding power is 800W, and the laser scanning speed is 20mm/s, so as to form a secondary welding seam layer;
3) spraying 50 wt% hydrogen peroxide solution on the secondary welding seam layer in an atomizing manner, and controlling the grain diameter of atomized liquid drops to be about 60-80 mu m by adopting a BR-50WH atomizing head to form an outer oxidation layer.
Example 5
A method for treating a weathering steel weld seam, the method comprising the steps of:
1) coating a coating at the welding seam of Q235NHA weathering steel, wherein the coating comprises the following components: 4.5 wt% of activated nano-silica, 8.5 wt% of AS-200 alumina sol, and 3.6 wt% of Mn3O4、3.5wt％Fe3O42.5 wt% Cu, 2.5 wt% cuprous oxide and 45 wt% Fe2O3And the balance butoxyethyl phosphate;
blowing with hot air at 150 deg.C and air speed of 5m/s for 5min to form a cured layer;
2) carrying out secondary welding on the welding seam by using laser welding, wherein the laser welding power is 500W, and the laser scanning speed is 15mm/s, so as to form a secondary welding seam layer;
3) spraying 50 wt% hydrogen peroxide solution on the secondary welding seam layer in an atomizing manner, and controlling the grain diameter of atomized liquid drops to be about 60-80 mu m by adopting a BR-50WH atomizing head to form an outer oxidation layer.
Comparative example 1
No treatment is carried out on the welded joint of the Q235NHA weathering steel.
Comparative example 2
The specific procedure was the same as in example 3, except that: only the step 1) operation is performed to form a solidified layer at the weld.
Comparative example 3
The specific procedure was the same as in example 3, except that: and (3) only performing the operations of the step 1) and the step 2) to form a secondary welding seam layer at the welding seam.
Comparative example 4
The specific procedure was the same as in example 3, except that: only the operations of step 1) and step 3) are performed, and the cured layer is directly oxidized.
The weld joints of the Q235NHA weathering steel obtained in examples 1-5 and comparative examples 1-3 were tested.
The test includes the following sections.
1) Periodic immersion corrosion test: preparing 3.5 wt% sodium chloride solution by deionized water and analytically pure sodium chloride, immersing the welded joint of the Q235NHA weathering steel in the sodium chloride solution for 15min every 105min at the constant temperature of 40 +/-1 ℃, carrying out experiments for one month in total, and recording the average weight gain per unit area (including the weight of the iron rust of the falling part in the recording process), wherein the data of the recorded table are shown in the following table 1.
Table 1: and (5) periodically soaking corrosion test results.
In the table: indicates the appearance of bulge in the outer oxide layer at the weld; indicates the appearance of the outer oxide layer at the weld bead.
It is obvious from the above table that the corrosion phenomenon at the weld joint of untreated Q235NHA weathering steel is very serious, especially, it can be seen from the above table that explosive corrosion has occurred on the seventh day, and the outer oxide layer has a bulge, the protection effect of the outer oxide layer is sharply reduced due to the bulge, and further, the outer oxide layer is seriously peeled off after 15d, so that the internal base material and the like are directly exposed in the strong corrosive environment with high salt content, severe corrosion is generated, and it is difficult to re-form the oxide skin with the protection effect in the high salt content environment, and the corrosion is continuously performed. Referring to comparative example 2 again, in comparative example 2, only the cured layer was formed by coating and hot air blowing curing, the cured layer exhibited similar performance to that of bare Q235NHA weathering steel at the very beginning, but large variability was generated after 3d, no explosive corrosion was generated between 3d and 7d, but since it was only the cured layer formed, the bonding property with the original weld layer and the base material was poor, and the elements between the coatings did not generate good composite effect, explosive corrosion was also generated around 15d, and the peeling phenomenon was rapidly generated. Comparative example 3 is further laser welding treatment on the basis of forming a cured layer, the cured layer is promoted to be tightly combined with the original weld seam layer and the base material through high heat energy flow of laser, the corrosion resistance of the weld seam is greatly improved, although the early performance of the laser is inferior to that of comparative example 4 which is subjected to rapid oxidation treatment, the formed secondary weld seam layer is more stable than an oxidative protection layer formed by oxidizing the cured layer, because the comparative example 4 is only subjected to oxidation treatment, the bonding degree of the cured layer and the base material is also poor, the phenomena of bulging and falling-off rapidly occur after the oxidation is carried out to a certain degree, explosive corrosion is generated, and the comparative example 3 is stable in structure and can generate good corrosion resistance effect though the early effect is poor. Compared with the comparative example 3, the corrosion resistance of the embodiments 1 to 5 of the technical scheme of the invention is all compared with that of the comparative example 3, because the outer oxide layer is formed by the prior oxidation treatment of the hydrogen peroxide spray, the oxide layer generated in the using process is more compact, stable and uniform, the element precipitation is less, and the obvious excellent effect is generated.
2) Metallographic observation is carried out on the welding seam of the Q235NHA weathering steel subjected to the 1) periodic infiltration corrosion test, grinding is carried out by using 80# to 1000# abrasive paper in sequence before observation, and corrosion positions in the samples are observed after grinding.
By observation:
in the embodiments 1-5, the corrosion positions are uniformly distributed, mainly in a punctiform distribution, and the line-mounted oxidation is rarely generated;
the comparative examples 1, 2 and 4 have serious corrosion oxidation, are basically island-shaped with larger area, and have serious diffusion into the crystal structure, thus generating serious damage to the crystal structure and inevitably leading to the reduction of the mechanical property;
in comparative example 3, the oxidation degree is relatively low, and the distribution uniformity of the etching positions is poor, mainly in discontinuous strip shapes and point shapes.
3) Parent metal diffusion phenomenon:
directly observing whether the base material at the edge of the welding seam of the Q235NHA weathering steel subjected to 1) periodic infiltration corrosion test is oxidized and corroded by naked eyes, and observing:
the base materials of the embodiments 1 to 5 have no oxidation corrosion, the base materials of the comparative examples 1, 2 and 4 have severe oxidation corrosion, and the case of the comparative example 3 is relatively light, and the welding seam joint of the base materials has slight oxidation and thin oxide skin.
The tests show that the corrosion resistance of the weathering steel weld joint treated by the method can be greatly improved, and the corrosion resistance is obviously improved particularly in a high-salinity environment.
Claims (8)
1. A method for processing a weathering steel welding seam is characterized in that,
the method comprises the following steps:
1) coating a coating at a welding seam of the weathering steel, and blowing by hot air to form a cured layer;
2) carrying out secondary welding on the welding seam by utilizing laser welding to form a secondary welding seam layer;
3) and spraying an oxidizing solution on the secondary welding seam layer to form an outer oxidizing layer.
2. The method for treating the weld joint of the weathering steel according to claim 1,
the coating comprises the following components:
3.0 to 6.5 wt% of silica, 6.5 to 10.5 wt% of alumina sol, 1.2 to 3.6 wt% of Mn3O4、2.1～4.0wt％Fe3O40.9 to 2.8 wt% of Cu, 1.5 to 3.2 wt% of cuprous oxide or cuprous salt and 42 to 48 wt% of Fe2O3And the balance of acidic phosphate ester.
3. The method for treating the weld joint of the weathering steel according to claim 2,
the addition amount of the alumina sol is 8.5-9.5 wt%;
the acidic phosphate ester is butoxyethyl phosphate.
4. The method for treating a weathering steel weld joint according to claim 1, 2 or 3,
hot air blowing is carried out for 5-10 min at 135-160 ℃;
the wind speed of the hot wind is 3-8 m/s.
5. The method for treating the weld joint of the weathering steel according to claim 1,
the laser welding power is 500-800W, and the laser sweeping speed is 15-25 mm/s.
6. The method for treating the weld joint of the weathering steel according to claim 1,
the oxidizing solution is a 45-55 wt% hydrogen peroxide solution.
7. The method for treating the weld joint of weathering steel according to claim 1 or 6,
and the spraying of the oxidation liquid is carried out in an atomization spraying mode.
8. The method for treating the weld joint of the weathering steel according to claim 7, characterized in that,
The particle size of the atomized liquid drops is 60-100 mu m.
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