Components of a low-hydrogen crack-resistant flux-cored welding wire and a preparation method thereof

Abstract

The invention belongs to the field of welding, and specifically discloses a component of a low-hydrogen crack-resistant flux-cored welding wire and a preparation method thereof, comprising a steel strip and a powder, wherein the powder comprises the following components by weight: 100 parts of metal powder, 20-40 parts of a deoxidizer, 10-20 parts of a slag forming agent, 10-20 parts of an arc stabilizer, and 5-10 parts of a plasticizer, wherein the composition and content of the metal powder are adjusted according to welding requirements and parent material components; the powder accounts for 10-20wt% of the mass of the welding wire; the invention also discloses a preparation method of the welding wire, and the low-hydrogen welding wire disclosed by the invention has the advantages of low welding crack sensitivity, good mechanical properties, high welding finish, less pore generation, and the like.

Description

Technical Field

[0001] The invention belongs to the field of welding, and specifically discloses components of a low-hydrogen crack-resistant flux-cored welding wire and a preparation method thereof. Background Art

[0002] In recent years, with the continuous development of welding technology, low-hydrogen anti-crack flux-cored welding wire has been widely used and developed as a high-efficiency and high-quality welding material. Low-hydrogen anti-crack flux-cored welding wire mainly improves the problem of easy cracking under conditions such as high carbon equivalent base material, thick plate narrow weld, and high-constraint assembly plate. By reducing the diffusible hydrogen content of low-melting point elements and compounds in the deposited metal and welding materials, the welding quality and crack resistance are effectively improved. At present, this welding wire has been widely used in ship and offshore platform projects, and domestic flux-cored welding wire has occupied the vast majority of the shipbuilding market. However, the existing low-hydrogen anti-crack flux-cored welding wire still has the following shortcomings and limitations.

[0003] 1. Impact on welding finish: Flux core will produce gas during welding, and these gases will affect the welding finish, thus affecting its mechanical properties and appearance quality. In addition, the gas may also produce defects such as pores, further affecting the welding quality.

[0004] 2. Easy to produce pores: Due to the presence of flux core, welding rods are prone to produce pores during welding, affecting the welding quality. This may lead to a decrease in mechanical properties such as strength and toughness of the weld.

[0005] 3. Preheating requirements: To solve the crack problem, the method of preheating before welding is currently adopted. However, the preheating temperature is proportional to the diffusible hydrogen content of the weld, the weld strength, and the thickness of the parent material, which may increase the customer's money and time costs. At the same time, preheating may also reduce welding efficiency and extend working time.

[0006] In summary, low-hydrogen anti-cracking flux-cored welding wire has significant advantages in improving welding quality and crack resistance, but it has disadvantages and limitations in welding finish, pore generation, preheating requirements, etc. Summary of the invention

[0007] Based on the deficiencies in the prior art, the present invention discloses a component of a low-hydrogen anti-cracking flux-cored welding wire and a preparation method thereof, so as to overcome the shortcomings and limitations of the above-mentioned existing low-hydrogen anti-cracking flux-cored welding wire, such as poor welding finish, easy generation of pores, and high preheating requirements.

[0008] The present invention includes the following technical solutions:

[0009] A component of a low-hydrogen crack-resistant flux-cored welding wire comprises a steel strip and powder, wherein the powder comprises the following components by weight:

[0010]

[0011] The composition and content of the metal powder are adjusted according to welding requirements and base material composition;

[0012] The powder accounts for 10-20wt% of the welding wire mass.

[0013] Furthermore, the metal powder of the above-mentioned low-hydrogen crack-resistant flux-cored welding wire comprises the following components:

[0014]

[0015] The low-hydrogen crack-resistant flux-cored welding wire is used in welding of steel materials.

[0016] Furthermore, in the above-mentioned component of the low-hydrogen crack-resistant flux-cored welding wire, the deoxidizer is silicon carbide.

[0017] Furthermore, the components of the above-mentioned low-hydrogen crack-resistant flux-cored welding wire, the slag-forming agent, calculated by weight, includes the following components:

[0018] Calcium fluoride 5-15 parts

[0019] Aluminum fluoride 2-4 parts.

[0020] Furthermore, the components of the above-mentioned low-hydrogen crack-resistant flux-cored welding wire, the arc stabilizer, calculated by weight, includes the following components:

[0021] Rutile 5-10 parts

[0022] 3-6 parts potassium carbonate

[0023] 3-6 parts of feldspar.

[0024] Furthermore, the components of the above-mentioned low-hydrogen crack-resistant flux-cored welding wire, the plasticizer, calculated by weight, include the following components:

[0025] 4-8 parts of triethyl borate

[0026] 2-4 parts of dioctyl phthalate.

[0027] Furthermore, the components of the low-hydrogen crack-resistant flux-cored welding wire include a steel strip and powder, and the powder includes the following components by weight:

[0028]

[0029] The low-hydrogen crack-resistant flux-cored welding wire is used in welding of steel materials.

[0030] The powder accounts for 10-20wt% of the welding wire mass.

[0031] Preferably, the components of the low-hydrogen crack-resistant flux-cored welding wire include a steel strip and powder, and the powder includes the following components by weight:

[0032]

[0033]

[0034] The low-hydrogen crack-resistant flux-cored welding wire is used in welding of steel materials.

[0035] The powder accounts for 15wt% of the welding wire mass.

[0036] Furthermore, the present invention discloses a method for preparing the low-hydrogen crack-resistant flux-cored welding wire, comprising the following steps:

[0037] The deoxidizer, slag-forming agent, arc stabilizer and plasticizer in the welding wire powder component are dried at low temperature, the low temperature drying temperature is 60-100°C, and the drying time is 2-4h; the metal powder in the welding wire powder component is dried at high temperature, the high temperature drying temperature is 400-500°C, and the drying time is 3-6h;

[0038] The above powders are dried and mixed evenly, ground and sieved, and fine powders above 200 mesh are taken and wrapped with steel belts with a powder filling ratio of 10-20%. The finished welding wires are then drawn.

[0039] Compared with the prior art, the present invention has the following outstanding beneficial effects:

[0040] The present invention discloses a component of a low-hydrogen anti-crack flux-cored welding wire and a preparation method thereof. Compared with traditional welding wires, the low-hydrogen anti-crack flux-cored welding wire of the present invention can produce smoother and more uniform welds during welding. This not only improves the appearance quality of the welded joint, but also reduces the workload of subsequent grinding and processing, and improves work efficiency; due to the characteristics of the low-hydrogen design, the probability of the welding wire generating pores during welding is extremely low. Porosity is one of the important factors affecting welding quality. Low porosity means that the mechanical properties and sealing properties of the welded joint are more reliable, reducing potential safety hazards; in steel welding, preheating is a necessary step, but excessive preheating requirements not only increase energy consumption, but may also have an adverse effect on the parent material. The low-hydrogen anti-crack flux-cored welding wire disclosed in the present invention has a lower preheating requirement during welding, which not only reduces energy consumption, but also expands the application range of the welding wire, so that it can be used in more types of steel and welding environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 ; Example 1-3 and Comparative Example 1-4 groove welding test crack rate (%);

[0042] Figure 2: Porosity of welds of Examples 1-3 and Comparative Examples 1-4 (%);

[0043] Figure 3 : Surface roughness (μm) of Examples 1-3 and Comparative Examples 1-4. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Example 1

[0046] A component of a low-hydrogen crack-resistant flux-cored welding wire comprises a steel strip and powder, wherein the powder comprises the following components by weight:

[0047]

[0048] The low-hydrogen crack-resistant flux-cored welding wire is used for welding high-carbon steel materials.

[0049] The powder accounts for 15wt% of the welding wire mass.

[0050] The method for preparing the low-hydrogen crack-resistant flux-cored welding wire is characterized by comprising the following steps:

[0051] The deoxidizer, slag-forming agent, arc stabilizer and plasticizer in the welding wire powder component are dried at low temperature, the low temperature drying temperature is 80°C, and the drying time is 3 hours; the metal powder in the welding wire powder component is dried at high temperature, the high temperature drying temperature is 450°C, and the drying time is 5 hours;

[0052] The above powders are dried and mixed evenly, ground and sieved, and fine powders above 200 mesh are taken and wrapped with steel belts with a powder filling ratio of 15%. The finished welding wires are then drawn.

[0053] Example 2

[0054] A component of a low-hydrogen crack-resistant flux-cored welding wire comprises a steel strip and powder, wherein the powder comprises the following components by weight:

[0055]

[0056] The low-hydrogen crack-resistant flux-cored welding wire is used for welding high-carbon steel materials.

[0057] The powder accounts for 15wt% of the welding wire mass.

[0058] The method for preparing the low-hydrogen crack-resistant flux-cored welding wire is characterized by comprising the following steps:

[0059] The deoxidizer, slag-forming agent, arc stabilizer and plasticizer in the welding wire powder component are dried at low temperature, the low temperature drying temperature is 80°C, and the drying time is 3 hours; the metal powder in the welding wire powder component is dried at high temperature, the high temperature drying temperature is 450°C, and the drying time is 5 hours;

[0060] The above powders are dried and mixed evenly, ground and sieved, and fine powders above 200 mesh are taken and wrapped with steel belts with a powder filling ratio of 15%. The finished welding wires are then drawn.

[0061] Example 3

[0062] A component of a low-hydrogen crack-resistant flux-cored welding wire comprises a steel strip and powder, wherein the powder comprises the following components by weight:

[0063]

[0064]

[0065] The low-hydrogen crack-resistant flux-cored welding wire is used for welding high-carbon steel materials.

[0066] The powder accounts for 15wt% of the welding wire mass.

[0067] The method for preparing the low-hydrogen crack-resistant flux-cored welding wire is characterized by comprising the following steps:

[0068] The deoxidizer, slag-forming agent, arc stabilizer and plasticizer in the welding wire powder component are dried at low temperature, the low temperature drying temperature is 80°C, and the drying time is 3 hours; the metal powder in the welding wire powder component is dried at high temperature, the high temperature drying temperature is 450°C, and the drying time is 5 hours;

[0069] The above powders are dried and mixed evenly, ground and sieved, and fine powders above 200 mesh are taken and wrapped with steel belts with a powder filling ratio of 15%. The finished welding wires are then drawn.

[0070] Comparative Example 1

[0071] No molybdenum powder is contained, and the rest is the same as Example 2.

[0072] Comparative Example 2

[0073] No titanium powder is contained, and the rest is the same as in Example 2.

[0074] Comparative Example 3

[0075] Meanwhile, molybdenum powder and titanium powder are not contained, and the rest is the same as in Example 2.

[0076] Comparative Example 4

[0077] Meanwhile, calcium fluoride and aluminum fluoride are not contained, and the rest is the same as in Example 2.

[0078] Test Example 1

[0079] The performance test was carried out on the low hydrogen crack resistant flux cored welding wire prepared in Examples 1-3 and Comparative Examples 1-4. The diameter of the welding wire was 1.2 mm, and the steel strip composition in the welding wire was:

[0080] C≤0.04%, Mn:0.150.35%, Si≤0.040%, S≤0.008%, P≤0.012%, the welding base material is 60 grade high carbon steel, the manual welding parameters are as follows: welding current 250A, welding arc voltage 29V, welding speed 10cm / min, no high temperature preheating, wind speed during welding is not more than 2m / s, relative humidity is not more than 90%.

[0081] The diffusible hydrogen content (mercury method mL / 100g) in the above welding, the welding tensile strength MPa, the groove welding test crack rate%, weld porosity%, surface smoothness (measured by roughness (μm)), the results are shown in Table 1 and Figure 1-3 .

[0082] Table 1 Welding parameter measurement results

[0083]

[0084] From the data in Table 1 above, it can be seen that the present invention discloses a component of a low-hydrogen anti-crack flux-cored welding wire and a preparation method thereof. Compared with traditional welding wires, the low-hydrogen anti-crack flux-cored welding wire in the present invention can produce smoother and more uniform welds during the welding process. This not only improves the appearance quality of the welded joint, but also reduces the workload of subsequent grinding and processing, and improves work efficiency; due to the characteristics of the low-hydrogen design, the probability of the welding wire generating pores during the welding process is extremely low. Porosity is one of the important factors affecting welding quality. Low porosity means that the mechanical properties and sealing properties of the welded joint are more reliable, reducing potential safety hazards; in steel welding, preheating is a necessary step, but excessive preheating requirements not only increase energy consumption, but may also have an adverse effect on the parent material. The low-hydrogen anti-crack flux-cored welding wire disclosed in the present invention has a lower preheating requirement during welding, which not only reduces energy consumption, but also expands the application range of the welding wire, allowing it to be used in more types of steel and welding environments.

[0085] The above are only a few preferred embodiments of the present invention, which are described in a more specific and detailed manner, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for preparing a low-hydrogen crack-resistant flux-cored welding wire, characterized in that: The components of the low-hydrogen crack-resistant flux-cored welding wire include a steel strip and powder, and the powder includes the following components by weight: 30 portions of iron powder Nickel powder 25 parts Chromium powder 20 parts Molybdenum powder 15 parts Titanium powder 10 parts Silicon carbide 30 parts Calcium fluoride 10 parts Aluminum fluoride 3 parts 8 parts of rutile 5 parts potassium carbonate 5 parts of feldspar 6 parts of triethyl borate 3 parts of dioctyl phthalate The powder accounts for 15wt% of the welding wire mass; The preparation method of the low hydrogen crack resistant flux cored welding wire comprises the following steps: The silicon carbide, calcium fluoride, aluminum fluoride, rutile, potassium carbonate, feldspar, triethyl borate and dioctyl phthalate in the welding wire powder components are subjected to low-temperature drying at 80°C for 3 hours; the metal powder in the welding wire powder components is subjected to high-temperature drying at 450°C for 5 hours; the above powders are dried and mixed evenly, ground and sieved, fine powder above 200 mesh is taken, wrapped by a steel belt, the powder filling ratio is 15%, and then drawn to make a finished welding wire.

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