900MPa high-strength welding wire for mining machine and application method

Abstract

The invention provides a 900MPa high-strength welding wire for a mining machine and an application method. The 900MPa high-strength welding wire is suitable for welding Q890 plates, Q900 plates and other high-strength plates. The gas shielded welding wire comprises the following chemical components, by mass, including 0.06-0.11% of C, 0.60-0.90% of Si, 1.40-2.00% of Mn, 1.4-2.0% of Ni, 0.30-0.80% of Cr, 0.10-0.40% of Mo, less than or equal to 0.20% of Ti, less than or equal to 0.020% of S, and less than or equal to 0.020% of P with balance being Fe and inevitable impurities. The 900MPa high-strength welding wire is used for welding under the protection of gas rich in argon, that is Ar + 20% of CO2, thereby having high strength and low-temperature toughness.

Description

technical field [0001] The invention relates to a high-strength welding wire suitable for welding Q890, Q900 and other high-strength plates and a use method, in particular to a 900MPa high-strength welding wire for mining machinery and a use method. Background technique [0002] With the rapid development of the coal mining industry, higher requirements are put forward for the reliability of coal mining machinery (such as high-strength hydraulic supports). [0003] At present, coal mining machinery mainly includes support equipment, mining equipment, transportation equipment, etc., and the support equipment includes shield support, support shield support, top-coal caving support, etc., which are all powered by high-pressure liquid. A coal mining face equipment that supports and controls the roof, which is composed of elements and some metal components, has the characteristics of high strength, fast moving speed, good support performance, safety and reliability, so in the pro...

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Problems solved by technology

[0004] At present, with the improvement of coal mining quality and the increase of coal seam height, the demand for large-scale hydraulic supports (over 7 meters in height) is increasing, and the corresponding high-strength steel plates and high-strength welding wires are also in urgent need of development. Currently, 800MPa High-strength plates Q890, Q900, etc. above grade, the welding wires corresponding to the above-mentioned high-strength plates are mostly imported from abroad, and the price is also very expensive.

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