A high-toughness gas shielded solid welding wire

Abstract

The invention relates to the technical field of welding materials, and proposes a high-toughness gas-shielded solid welding wire, which is composed of the following components in weight percentage: C 0.06%-0.12%, Mn 0.4%-0.7%, Si 0.2%-0.5%, Ni 0.1%-0.4%, Cr 0.1%-0.4%, Mo 0.1%-0.4%, Ta 0.1%-0.9%, Cu 0.15%-0.35%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and inevitable impurities. Through the above technical scheme, the problems of poor toughness of deposited metal after gas-shielded solid welding wire welding and high manganese content in gas-shielded solid welding wire in the related art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of welding materials, and in particular to a high-toughness gas shielded solid welding wire. Background Art

[0002] Gas shielded welding technology, as a core and efficient process in the field of contemporary steel structure manufacturing, has occupied a pivotal position in many manufacturing industries, and its application popularity is remarkable. Within this technical framework, gas shielded solid welding wire, as an indispensable welding material, has become the preferred solution in the industry due to its wide applicability, ease of operation, high operational flexibility and automation compatibility.

[0003] At present, the toughness of the deposited metal formed by gas-shielded solid welding wire is poor, which significantly restricts the overall quality of the finished welding product and the expansion of potential application areas. In addition, the gas-shielded solid welding wire contains a lot of manganese. If workers work in an environment with manganese smoke for a long time, manganese poisoning is likely to occur, which has become a key problem that needs to be solved urgently. Therefore, it is of great significance to develop a high-toughness gas-shielded solid welding wire with a low manganese content. Summary of the invention

[0004] The present invention provides a high-toughness gas-shielded solid welding wire, which solves the problems in the related art that the toughness of deposited metal after gas-shielded solid welding wire welding is poor and the manganese content in the gas-shielded solid welding wire is high.

[0005] The technical solution of the present invention is as follows:

[0006] The invention provides a high-toughness gas shielded solid welding wire, which is composed of the following components in weight percentage: C 0.06%-0.12%, Mn 0.4%-0.7%, Si 0.2%-0.5%, Ni 0.1%-0.4%, Cr 0.1%-0.4%, Mo 0.1%-0.4%, Ta 0.1%-0.9%, Cu 0.15%-0.35%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and inevitable impurities.

[0007] As a further technical solution, the gas shielded solid welding wire is composed of the following components in weight percentage: C 0.06%~0.08%, Mn 0.55%~0.7%, Si 0.2%~0.5%, Ni 0.25%~0.4%, Cr 0.1%~0.4%, Mo 0.3%~0.4%, Ta 0.1%~0.9%, Cu 0.15%~0.25%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

[0008] As a further technical solution, the ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5-2:1.

[0009] In the present invention, when the ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5-2:1, it helps to further improve the toughness of the deposited metal after gas shielded solid welding wire welding.

[0010] As a further technical solution, the weight ratio of the Ta to the Cr is 1.5~2:1.

[0011] In the present invention, when the weight ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5-2:1 and the weight ratio of Ta to Cr is 1.5-2:1, it helps to further improve the toughness of the deposited metal after gas shielded solid welding wire welding.

[0012] As a further technical solution, the diameter of the gas shielded solid welding wire is 1-1.2 mm.

[0013] The invention also provides a gas shielded welding method, and the gas shielded solid welding wire is used during welding.

[0014] As a further technical solution, during the welding, the shielding gas is CO2 gas or Ar-CO2 mixed gas.

[0015] As a further technical solution, the volume fraction of CO2 in the Ar-CO2 mixed gas is 70%~80%.

[0016] As a further technical solution, during the welding, the welding current is 220~260A, the welding voltage is 24~30V, the welding speed is 25~30cm / min, and the gas flow rate is 10~20L / min.

[0017] The present invention also proposes the application of the high-toughness gas-shielded solid welding wire in gas-shielded welding of Q345 series steels, SM490 series steels, and Q550 series steels.

[0018] In the present invention, the gas shielded solid welding wire has a wide application range and has excellent matching degree with Q345 series steel, SM490 series steel and Q550 series steel.

[0019] The working principle and beneficial effects of the present invention are:

[0020] In the present invention, the gas shielded solid welding wire has a low manganese content, which effectively improves the working environment during welding and reduces the manganese content in welding smoke. In addition, by adopting the design concept of element synergy and overall enhancement, silicon, chromium and tantalum are added, and the three work together to make the gas shielded solid welding wire still have good toughness of the deposited metal after welding under the condition of low manganese. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] Example 1

[0023] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.06%, Mn 0.4%, Si 0.2%, Ni 0.1%, Cr 0.1%, Mo 0.1%, Ta 0.1%, Cu 0.15%, S 0.005%, P 0.005%, O 50ppm, N 50ppm, and the rest is Fe and inevitable impurities.

[0024] Example 2

[0025] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.12%, Mn 0.7%, Si 0.5%, Ni 0.4%, Cr 0.4%, Mo 0.4%, Ta 0.9%, Cu 0.35%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0026] Example 3

[0027] A high-toughness gas shielded solid welding wire is composed of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.5%, Ni 0.25%, Cr 0.4%, Mo 0.3%, Ta 0.9%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0028] Example 4

[0029] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.5%, Ni 0.25%, Cr 0.125%, Mo 0.3%, Ta 0.5%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0030] Example 5

[0031] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.35%, Ni 0.25%, Cr 0.155%, Mo 0.3%, Ta 0.62%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0032] Example 6

[0033] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.45%, Ni 0.25%, Cr 0.135%, Mo 0.3%, Ta 0.54%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0034] Example 7

[0035] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.375%, Ni 0.25%, Cr 0.15%, Mo 0.3%, Ta 0.6%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0036] Example 8

[0037] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.375%, Ni 0.25%, Cr 0.4%, Mo 0.3%, Ta 0.35%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0038] Example 9

[0039] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.375%, Ni 0.25%, Cr 0.3%, Mo 0.3%, Ta 0.45%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0040] Example 10

[0041] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.08%, Mn 0.55%, Si 0.375%, Ni 0.25%, Cr 0.25%, Mo 0.3%, Ta 0.5%, Cu 0.25%, S 0.003%, P 0.003%, O 30ppm, N 30ppm, and the rest is Fe and inevitable impurities.

[0042] Comparative Example 1

[0043] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.06%, Mn 0.4%, Si 0.2%, Ni 0.1%, Mo 0.1%, Ta 0.2%, Cu 0.15%, S 0.005%, P 0.005%, O 50ppm, N 50ppm, and the rest is Fe and inevitable impurities.

[0044] Comparative Example 2

[0045] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.06%, Mn 0.4%, Si 0.2%, Ni 0.1%, Mo 0.1%, Cr 0.2%, Cu 0.15%, S 0.005%, P 0.005%, O 50ppm, N 50ppm, and the rest is Fe and inevitable impurities.

[0046] Comparative Example 3

[0047] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.06%, Mn 0.4%, Ni 0.1%, Cr 0.1%, Mo 0.1%, Ta 0.1%, Cu 0.15%, S 0.005%, P 0.005%, O 50ppm, N 50ppm, and the rest is Fe and inevitable impurities.

[0048] Comparative Example 4

[0049] A high-toughness gas shielded solid welding wire consists of the following components in weight percentage: C 0.06%, Mn 0.4%, Ni 0.1%, Mo 0.1%, Cu 0.15%, S 0.005%, P 0.005%, O 50ppm, N 50ppm, and the rest is Fe and inevitable impurities.

[0050] Gas shielded solid welding wires (all with a diameter of 1.2 mm) of Examples 1 to 10 and Comparative Examples 1 to 4 were respectively used to perform gas shielded welding on Q550D steel with a thickness of 20 mm (single-side groove angle of 10°, root gap of 16 mm) according to the following welding process;

[0051] Welding process: Ar-CO2 mixed gas is used for protection (the volume fraction of CO2 in the mixed gas is 80%), the welding current is 240A, the welding voltage is 26V, the welding speed is 28cm / min, and the gas flow rate is 15L / min. According to GB / T 2650-2022 "Impact test of destructive test of metal material welds", the impact absorption energy of the deposited metal at -20℃ and -40℃ is tested, where the notch is a V-notch, and each group of samples has 3 samples, and the arithmetic mean is used as the test result of the impact absorption energy. The test results are shown in Table 1 below.

[0052] Table 1 Test results

[0053]

[0054] The comparison between Example 1 and Comparative Examples 1 to 4 shows that by adding silicon, chromium and tantalum to the gas-shielded solid welding wire, the three work together to make the gas-shielded solid welding wire still have good toughness after welding under low manganese conditions. The comparison between Examples 4 to 5 and Examples 6 to 7 shows that when the ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5 to 2:1, it helps to further improve the toughness of the weld metal after welding of the gas-shielded solid welding wire. The comparison between Examples 7 to 8 and Examples 9 to 10 shows that when the ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5 to 2:1 and the weight ratio of Ta to Cr is 1.5 to 2:1, it helps to further improve the toughness of the weld metal after welding of the gas-shielded solid welding wire.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-toughness gas shielded solid welding wire, characterized in that: It is composed of the following components in weight percentage: C 0.06%~0.12%, Mn 0.4%~0.7%, Si 0.2%~0.5%, Ni 0.1%~0.4%, Cr 0.1%~0.4%, Mo 0.1%~0.4%, Ta 0.1%~0.9%, Cu 0.15%~0.35%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and unavoidable impurities; The ratio of the sum of the weights of Ta and Cr to the weight of Si is 1.5-2:

1.

2. The high toughness gas shielded solid welding wire according to claim 1, characterized in that: It is composed of the following components in weight percentage: C 0.06%~0.08%, Mn 0.55%~0.7%, Si 0.2%~0.5%, Ni 0.25%~0.4%, Cr 0.1%~0.4%, Mo 0.3%~0.4%, Ta 0.1%~0.9%, Cu 0.15%~0.25%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

3. The high-toughness gas shielded solid welding wire according to claim 1, characterized in that: The weight ratio of the Ta to the Cr is 1.5-2:

1.

4. The high-toughness gas shielded solid welding wire according to claim 1, characterized in that: The diameter of the gas shielded solid welding wire is 1-1.2 mm.

5. A gas shielded welding method, characterized in that: The gas shielded solid welding wire according to any one of claims 1 to 4 is used during welding.

6. A gas shielded welding method according to claim 5, characterized in that: During the welding, the shielding gas is CO2 gas or Ar-CO2 mixed gas.

7. A gas shielded welding method according to claim 6, characterized in that: In the Ar-CO2 mixed gas, the volume fraction of CO2 is 70% to 80%.

8. A gas shielded welding method according to claim 5, characterized in that: During the welding, the welding current is 220-260A, the welding voltage is 24-30V, the welding speed is 25-30cm / min, and the gas flow rate is 10-20L / min.

9. Application of a high-toughness gas shielded solid welding wire according to any one of claims 1 to 4 in gas shielded welding of Q345 series steels, SM490 series steels, and Q550 series steels.

Images