High-strength anti-cracking metal powder core type flux-cored wire for engineering machinery

Abstract

The high-strength anti-cracking metal powder core type flux-cored wire for the engineering machinery comprises a steel belt and powder filled in the steel belt, and the powder comprises the following components in percentage by mass: 1.5-2.0% of silicon carbide, 10-14% of ferromanganese, 0.4-0.8% of silicon-barium alloy, 8-14% of nickel powder, 0-3% of ferrochromium, 1-4% of molybdenum powder, 0.3-0.4% of niobium-zirconium alloy, 0.2-0.5% of strontium fluoride, 0.2-0.5% of arc stabilizer and the balance of iron powder. And the balance of iron powder. The metal powder core type flux-cored wire has the excellent comprehensive mechanical properties of high strength, high toughness and the like, the tensile strength of the metal powder core type flux-cored wire is larger than or equal to 780 MPa, the yield strength of the metal powder core type flux-cored wire is larger than or equal to 670 MPa, and the impact energy at-50 DEG C is larger than or equal

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a high-strength crack-resistant metal powder-cored flux-cored welding wire for engineering machinery. Background technique [0002] In recent years, steel plates for construction machinery have continued to develop in the direction of high strength and high toughness, and the welding materials used for Q690 steel plates have also gradually achieved localization matching. Metal powder cored flux cored wire was produced under the background of replacing solid wire welding process to improve production efficiency. At present, various metal powder cored flux-cored welding wires have appeared in the market one after another. In the production process, most of them adopt the design with seams and no copper plating. The gaps between the seams are easy to absorb moisture, resulting in high diffusible hydrogen content and hydrogen-induced cracks. More serious, the construction ...

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Problems solved by technology

[0006] Chinese patent 201610808464.4 discloses "Metal powder-type flux-cored welding wire for 1000MPa high-strength steel and its production process". In terms of mass percentage, the powder core includes the following components: silicon-manganese alloy 3-6wt%, ferrosilicon powder 3-8wt% , ferro-titanium powder 0.5-2.2wt%, fluoride 0.01-0.28wt%, manganese powder 10-19wt%, nickel powder 10-18wt%, molybdenum iron 6-10wt%, chromium powder 3-8% and the balance of iron Powder and unavoidable impurities; the strength of the patented welding wire is about 1000MPa, and the strength is improved by adding a large amount of Cr, Ni, and Mo alloys, and through Ti microalloying, the excessively high alloy content causes problems in weld formation and crack resistance

The strength of this welding wire is about 800MPa. Ti microalloying is used, and Mg is used for strong deoxidation. The content of 1-4% will inevitably cause welding slag residue, and the text does not explain the crack resistance

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