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High intensity metallic core type seamless flux-cored wire

A seamless flux-cored welding wire and metal-cored technology, applied in metal processing equipment, welding media, welding equipment, etc., can solve the problems of low yield strength of deposited metal, difficult to meet high yield strength, etc., to reduce spatter and stabilize Arc, the effect of improving the strength of the weld metal

Inactive Publication Date: 2008-12-17
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3) Patent No. ZL99100147.8 and Publication No. CN1068270C disclose a gas-shielded flux-cored welding wire for all-position welding with high toughness. The examples show that the yield strength of deposited metal obtained by using this welding wire is lower than 500Mpa
[0007] After searching the flux-cored welding wire in the prior art, it is difficult to meet the welding needs of high-strength structural steel with a yield strength greater than 785MPa, so it is necessary to design a flux core consistent with the base metal for high-strength structural steel with a yield strength greater than 785MPa welding wire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-strength metal-cored seamless flux-cored welding wire is filled with powdered steel in a steel sheath (1); the steel sheath (1) also contains steel with a mass percentage of 0.03% carbon (C), 0.02% silicon (Si), 0.5% manganese (Mn), 0.005% sulfur (S), 0.013% phosphorus (P); the powder filled into it contains 5.5% by mass % ferrosilicon powder (calculated as silicon Si), 11% metallic manganese powder, 1% titanium ferro powder (calculated as titanium Ti), 34% metallic nickel powder, 8% metallic chromium powder, 4% molybdenum Iron powder (calculated as molybdenum Mo), 4.5% titanium dioxide (TiO 2 ), 0.3% silicon dioxide (SiO 2 ), 0.2% manganese oxide (MnO), 1.8% sodium fluoride (NaF) (calculated as sodium Na), 0.6% potassium oxide (K 2 O), the rest is 29.1% iron powder. In this embodiment, the powder filling rate is 11%, and the diameter of the welding wire is 1.2mm.

Embodiment 2

[0041] A high-strength metal-cored seamless flux-cored welding wire is filled with powdered steel in a steel sheath (1); the steel sheath contains steel with a mass percentage of 0.03% of carbon (C), 0.02% of silicon (Si), 0.5% of manganese (Mn), 0.005% of sulfur (S), 0.013% of phosphorus (P); the powder filled into it contains a mass percentage of 2 % ferrosilicon powder (calculated as silicon Si), 26% metal manganese powder, 2.5% ferro-titanium powder (calculated as titanium Ti), 28% metal nickel powder, 8.5% molybdenum iron powder (calculated as molybdenum Mo ), 1.2% titanium dioxide (TiO 2 ), 0.2% silicon dioxide (SiO 2 ), 0.5% aluminum oxide (AL 2 o 3 ), 0.2% manganese oxide (MnO), 0.5% sodium fluoride (NaF) (calculated as sodium Na), 2.7% potassium oxide (K 2 O), the rest is 27.7% iron powder. In this embodiment, the powder filling rate is 11%, and the diameter of the welding wire is 1.2mm.

Embodiment 3

[0043] A high-strength metal-cored seamless flux-cored welding wire is filled with powdered steel in a steel sheath (1); the steel sheath (1) also contains steel with a mass percentage of 0.04% carbon (C), 0.02% silicon (Si), 0.4% manganese (Mn), 0.25% yttrium (Y), 0.006% sulfur (S), 0.013% phosphorus (P); filled into The powder contains 4.5% ferrosilicon powder (calculated as silicon Si), 15% metal manganese powder, 1.5% ferro-titanium powder (calculated as titanium Ti), 26% metal nickel powder, 6% Metal chromium powder, 3% ferromolybdenum powder (calculated as molybdenum Mo), 3% titanium dioxide (TiO 2 ), 0.2% silicon dioxide (SiO 2 ), 0.1% aluminum oxide (AL 2 o 3 ), 0.6% of manganese oxide (MnO), 1.6% of sodium fluoride (NaF) (calculated as sodium Na), 1.5% of potassium oxide (K 2 O), and the rest are 37% iron powder. In this embodiment, the powder filling rate is 14%, and the diameter of the welding wire is 1.4mm.

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Abstract

The invention discloses a high strength metal core type seamless flux-cored welding wire relating to the technical field of welding materials; the invention can be manufactured by adopting the existing steel tube drawing or in-service welding seamless flux-cored welding wire manufacturing technology; the diameter of a steel tube is reduced to the extent that the filling diameter of a specified filling rate can be acquired; by using the vibration filling pattern, filler is filled from one end of the steel tube; wire drawing processing is performed by using a roller group or a wire drawing die group, and during the period intermediate annealing is carried out (under 650 DEG C for two hours). The high strength metal core type seamless flux-cored welding wire of the invention has the advantage that yield strength is larger than 785MPa, and the requirements of high strength structure steel welding can be satisfied.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a high-strength metal-cored seamless flux-cored welding wire for gas-shielded arc welding. Background technique [0002] Flux-cored welding wire is widely used in the welding construction of steel structures such as ships, bridges, and offshore platforms due to its good welding processability and high welding efficiency. At present, the strength level of structural steel is increasing day by day, and high-strength structural steel with a yield strength greater than 785MPa has been applied in the construction of steel structures, which requires that the strength of the weld metal obtained by the flux-cored wire used should be consistent with that of the base metal, and has Good impact toughness; at the same time, in order to make the welded joint have good resistance to welding cold cracks, the content of diffusible hydrogen in the weld is required to be at an ultra-low ...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/30B23K35/12
Inventor 薛钢牛继承杜义
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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