A 70kg high-strength and high-toughness air-protected solid welding wire dedicated to the coal machinery industry

Abstract

The invention belongs to the technical field of welding materials, and specifically relates to a 70-kilogram high-strength and high-toughness air-shielded solid welding wire for the coal machinery industry, which includes the following components by weight percentage: C: 0.04-0.075%, Si: 0.25-0.50 %, Mn: 1.80~2.50%, Cr: 0.15~0.30%, Mo: 0.25~0.35%, Ni: 0.30~0.60%, Zr: 0.02~0.06%, Sr: 0.02~0.06%, rare earth yttrium: 0.003~0.01 %, Ti: 0.07~0.15%, V: 0.005~0.05%, B: 0.003~0.007%, Ca: ≤0.04%, S: 0.005~0.010%, P: ≤0.010%, and the rest are trace impurity elements and Fe. The gas-shielded solid welding wire has large welding specifications, high welding efficiency, and can adapt to a welding current of up to 330A-500A, which can effectively solve the large-scale welding problem in the coal mining industry, and there is no or less slag after welding smoothly; it has the characteristics of high safety factor and guarantees The coal machinery industry has very high requirements for safety, and the yield strength is below 0.88; it has excellent low-temperature impact toughness, the impact energy at ‑20°C is ≥200J, and the impact energy at ‑40°C is ≥100J, and it has good crack resistance and manufacturability ; In addition, the welding wire adopts copper-free production process, which has the characteristics of low dust generation and green environmental protection.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a 70-kg high-strength and high-toughness air-protected solid welding wire for the coal machinery industry. Background technique [0002] As the main energy source in my country, coal still accounts for more than 50% of the share. With the continuous development of the coal mining machinery industry, the previous heavy hydraulic supports and wooden supports are gradually eliminated, and the amount of high-strength steel is increasing. Steel with high strength, high toughness, and good crack resistance Materials are widely used in the coal machinery industry, such as Q550, Q620, Q690 and other steel plates are constantly appearing, at the same time new requirements are put forward for welding materials, high strength, high toughness, good crack resistance, high safety and excellent welding Manufacturability has become the development trend of welding consumables...

AI Technical Summary

Problems solved by technology

[0003] However, in the face of the continuous application of high-strength steel welding consumables, there are still the following problems: first, safety issues, especially for welding consumables with a tensile strength above 700MP in pursuit of high strength, C, Si and other elements and alloy components are generally high, resulting in The yield ratio is above 0.9, and the crack resistance cannot be guaranteed

The second is the problem of welding process. Large-scale welding has large spatter and more welding slag, which causes great troubles to the later coating, and the production efficiency is significantly reduced. In addition, the metal "smoke" of traditional copper welding wire is serious, which is more harmful to construction personnel. Big

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