Metal powder-cored flux-cored welding wire for additive manufacturing and welding method thereof

Abstract

The invention provides a metal powder core type flux-cored wire for additive manufacturing. The metal powder core type flux-cored wire for additive manufacturing comprises carbon steel outer skin anda flux core arranged in the carbon steel outer skin. The flux core comprises the following components in percentage by mass based on total mass: 0.8-1.2% of rutile, 2-3.2% of sodium fluoride, 1-2% offerrotitanium, 0.2-0.5% of ferroboron, 0.4-0.8% of magnesium powder, 2-4% of 75# atomized ferrosilicon, 0.3-0.7% of a silicon-zirconium alloy, 3-3.8% of ferromolybdenum, 25-30% of nickel powder, 0.4-1.1% of anhydrous feldspar, 0.2-0.6% of rare earth fluoride, 2.2-3.1% of electrolytic manganese and the balance iron powder. According to the flux-cored wire, the oxygen content of a weld joint is reduced by way of combined deoxygenation of Mn-Mg-Si-Ti-Zr, and meanwhile, by adding a proper amount of minerals, the weld joint forming and arc stability is improved; by adding the iron powder, the deposition efficiency of the flux-cored wire is improved; by adding the rare earth alloy, the S content in weld joint metal is reduced and the shape of the occluded foreign substances is changed, so that the low-temperature toughness is improved, and therefore, the flux-cored wire is stable in mechanical property of melted metal, good in crack resistance and excellent in low-temperature toughness at 50DEG C below zero.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a metal powder-cored flux-cored welding wire for additive manufacturing and a preparation method thereof. Background technique [0002] Additive manufacturing technology uses electric arc as heat source and is developed based on TIG, MIG, MAG, SAW and other welding technologies. It adopts layer-by-layer deposition to manufacture equipment components. The open forming environment has the characteristics of unlimited size of formed parts and high forming rate. [0003] From the perspective of the development of additive manufacturing, materials, equipment, and technology are the three core elements of this technology. While printing equipment and technology are gradually maturing, material bottlenecks have become the primary problem restricting the development of additive manufacturing technology. The limitation of raw materials It is a research and developme...

AI Technical Summary

Problems solved by technology

Existing raw materials still have technical difficulties in the control of S, P content and precise composition control, and the shipbuilding industry often has high requirements on the performance of parts, which to a certain extent restricts the rise and development of metal additive manufacturing technology

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