A kind of gas shielded solid welding wire for ultra-high strength engineering machinery steel plate and its application

Abstract

The invention belongs to the technical field of welding materials, and in particular relates to a gas-shielded solid welding wire for ultra-high-strength construction machinery steel plates, which comprises the following components in terms of mass percentage: C: 0.08-0.12%, Si: 0.70-0.90%, Mn: 1.65-1.85%, Cr: 0.45-0.65%, Ni: 2.3-2.5%, Mo: 0.40-0.70%, Ti: 0.08-0.15%, Zr: 0.04-0.08%, Nb: 0.05-0.10%, B : 0.004~0.006%, S: 0.005~0.015%, P≤0.010%, the balance is iron and unavoidable impurities. The present invention also provides the application of the above-mentioned gas-shielded solid welding wire, which is used for welding ultra-high-strength engineering machinery steel plates with a tensile strength of 960 MPa. The weld seam formed by welding with the solid welding wire provided by the invention has the advantages of good low-temperature impact toughness, low yield ratio, high strength, and beautiful shape; and the welding spatter is small, and the welding process performance is excellent; the use of argon-rich (80%Ar+20 %CO 2 ) gas shielded welding, the yield ratio of the deposited metal is ≤0.9, which is suitable for the welding of ultra-high-strength engineering machinery steel plates such as Q890 with a tensile strength of 960MPa.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a gas-shielded solid welding wire for ultra-high-strength construction machinery steel plates with good low-temperature impact toughness and low yield ratio. Background technique [0002] With the development of microalloying technology and the progress of metallurgical technology, due to the demand for environmental protection and energy saving, the lightweight development trend of the construction machinery manufacturing industry is intensifying. The lighter the machine, the lower the energy consumption, so as to achieve environmental protection and energy saving. Energy saving needs. Therefore, various high-strength steels and ultra-high-strength steels have emerged. The research and development and use of these steel materials have promoted the progress of science and technology, and also meet the needs of the times. [0003] However, the higher the st...

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Problems solved by technology

[0003] However, the higher the strength, the lower the toughness of the steel, and the plasticity cannot be effectively guaranteed, so that the safety of construction machinery cannot be guaranteed; especially for ultra-high-strength steel (960MPa grade and above), the yield ratio (yield Strength and tensile strength ratio) are basically close to 1. It is unsafe to apply such steel to construction machinery. This situation limits the use and development of ultra-high-strength steel.

The invention patent with the publication number CN106141492A discloses a high-strength welding wire, but its tensile strength is 985MPa, yield strength is 955MPa, its yield strength ratio is 0.97, and its low-temperature impact value at -40°C is only 63J. The plasticity is not high and the toughness is not enough. Two points make this welding wire a great safety hazard in construction machinery manufacturing