Chromium-molybdenum-seel flux welding wire for gas shielded arc welding

Abstract

The invention discloses a Cr-Mo steel flux-cored wire applying to gas shielded welding. The content proportion of the core wire accounting for the weight of the welding wire is as following: TiO2: 4 to 6%, Si: 0.2 to 0.5%, Mn: 1 to 2.2%, SiO2: 0.1 to 1%, ZrO2: 0.1 to 0.5%, Cr: 2 to 2.8%, Mo: 0.9 to 1.5%, Ni: 0 to 5%, B: 0.002 to 0.01%, Ti: 0.02 to 0.3%, Fe: 2 to 6%, Al+Mg: 0.4 to 0.75%, K, Na and Li: 0.1 to 0.35 which is converted from K, Na and Li alkali oxide and / or fluoride, wherein k: 0.02 to 0.07%, Na / Li / Na+Li: 0.08 to 0.3%, F: 0.1 to 0.35% converted from fluoride. The proportion of S, P, Sn and Bi is less than 0.035% in the carbon steel and the core wire powders. The welding wire has the advantages that: the intensity and heat-resistant of the weld joint can be insured, at same time, the invention still has good low-temperature impact toughness and global welding performance; the stability of the electric arc and the welding operation processing property are both good; the weld joint is smooth; the weld joint metal is of good low-temperature impact toughness and crack resistance; the invention is suitable for welding heat-resistant steel such as the 2.25-Cr-1-Mo steel.

Description

technical field [0001] The invention relates to a welding material for metal welding, in particular to a chromium-molybdenum steel flux-cored welding wire for gas shielded welding. It is suitable for welding heat-resistant steel such as 2.25 chromium 1 molybdenum steel with Ar+CO2 mixed gas. Background technique [0002] Gas-shielded flux-cored wire welding is compatible with the advantages of manual electrodes and gas-shielded welding solid wire welding, with high production efficiency and good welding process performance. It has been widely used in the welding of carbon steel, low-alloy steel and high-alloy steel. However, when welding heat-resistant steel, especially 2.25Cr1Mo heat-resistant steel, the commonly used titanium-type flux-cored wire still has the defect of low low-temperature impact toughness. Crack resistance also needs to be improved. [0003] Chinese patent publication number: CN 101041214A, publication date: September 26, 2007, the title of the inventio...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and deficiencies in the prior art that cannot meet the manufacturability and all-position welding performance requirements of high-grade heat-resistant steel welds, and provide a chrome-molybdenum steel flux-cored welding wire for gas shielded welding

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