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High-strength and ultra-low-hydrogen flux-cored wire

A technology of flux-cored welding wire and ultra-low hydrogen, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems that cannot fully meet the market demand, and achieve high toughness and good effect

Active Publication Date: 2016-05-11
HAINING RUIAO METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, existing technologies and products cannot fully meet market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Low-carbon steel skin with a thickness of 0.8mm is used, and its chemical composition contains: C0.03%, Si0.07%, Mn0.65%, P0.012%, S0.005%, and the balance is Fe and unavoidable impurities; The medicinal powder includes: 8% nickel powder, 9% ferromanganese powder, 1.5% ferromolybdenum powder, 2.5% ferro-titanium powder, 8% iron yttrium powder, 1.5% iron-silicon powder, 6% potassium fluoride, and 5% feldspar , 0.6% quartz, 1.5% fluorite, 0.4% sodium carbonate, 0.4% potassium oxide, and the rest is iron powder. After filling, coiling and drawing, a welding wire with a diameter of 4.0mm is formed.

[0032] The test base material is 60mm thick ship plate steel EH56, with a yield strength of 585MPa, a tensile strength of 726MPa, an elongation of 21%, and an impact energy of -40°C of 228J.

[0033] The submerged arc welding process is adopted, the flux is SJ101G, the welding groove is double-sided V-shaped, the angle is 45°, there is no preheating, the interlayer temperature...

Embodiment 2

[0037] Low-carbon steel sheet with a thickness of 0.8mm is used, and its chemical composition contains: C0.04%, Si0.08%, Mn0.62%, P0.011%, S0.004%, and the balance is Fe and unavoidable impurities; The medicinal powder includes: 9% nickel powder, 7% ferromanganese powder, 1.3% ferromolybdenum powder, 2.1% ferro-titanium powder, 9% iron yttrium powder, 1.3% iron-silicon powder, 7% potassium fluoride, and 6% feldspar , 0.8% quartz, 1.1% fluorite, 0.6% sodium carbonate, 0.3% potassium oxide, and the rest is iron powder. After filling, rolling and drawing, a welding wire with a diameter of 3.2mm is formed.

[0038] The test base material is marine steel EQ56 with a thickness of 80mm. Its yield strength is 578MPa, tensile strength is 718MPa, elongation is 21%, and impact energy at -40°C is 212J.

[0039] The submerged arc welding process is adopted, the flux is SJ101G, the welding groove is double-sided V-shaped, the angle is 45°, no preheating, the interlayer temperature is ≤200°...

Embodiment 3

[0043] Low-carbon steel skin with a thickness of 0.8mm is used, and its chemical composition contains: C0.03%, Si0.09%, Mn0.68%, P0.008%, S0.003%, and the balance is Fe and unavoidable impurities; The medicinal powder includes: 12% nickel powder, 6% ferromanganese powder, 2.1% ferromolybdenum powder, 1.2% ferro-titanium powder, 6% iron yttrium powder, 2.2% iron-silicon powder, 3% potassium fluoride, and 7% feldspar , 1.3% quartz, 1.2% fluorite, 0.8% sodium carbonate, 0.2% potassium oxide, and the rest is iron powder. After filling, coiling and drawing, a welding wire with a diameter of 4.0mm is formed.

[0044]The test base material is 30mm thick marine machinery steel Q550E, with a yield strength of 568MPa, a tensile strength of 736MPa, an elongation of 21%, and an impact energy of -40°C of 242J.

[0045] The submerged arc welding process is adopted, the flux is SJ101G, the welding groove is double-sided V-shaped, the angle is 40°, there is no preheating, the interlayer temp...

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Abstract

The invention discloses a high-strength and ultra-low-hydrogen flux-cored wire which is composed of a carbon steel wrapper and inner flux-cored powder. The high-strength and ultra-low-hydrogen flux-cored wire comprises, by weight percentage, 5-15% of nickel powder, 5-10% of ferromanganese powder, 0.5-2.5% of ferromolybdenum powder, 0.5-3.0% of ferrotitanium powder, 5-10% of iron-yttrium powder, 0.5-2.5% of iron-silicon powder, 2-10% of potassium fluoride, 3-8% of feldspar, 0.1-1.5% of quartz, 0.5-2.0% of fluorite, 0.1-1.0% of sodium carbonate, 0.1-1.0% of potassium oxide and the balance iron powder. According to submerged-arc welding weld metal manufactured through the flux-cored wire, the content of diffusible hydrogen is smaller than or equal to 3 ml / 100 g, the tensile strength is larger than or equal to 700 MPa, and the impact toughness at minus 40 DEG C is larger than or equal to 50 J.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a high-strength, ultra-low hydrogen flux-cored welding wire. Background technique [0002] The widespread use of high-strength steel has led to increased sensitivity to cold cracks (or delayed cracks) during the welding process, increasing the probability of welding defects, and bringing difficulties to welding construction. The research shows that reducing the diffusible hydrogen content and strength of weld metal are two effective means to reduce welding cracks. Therefore, for high-strength steel welding, it is necessary to use low-hydrogen welding materials to reduce the sensitivity of welding cracks, so as to avoid welding cracks and improve the quality of welded joints. [0003] Flux-cored wires are widely used in large structural industries such as shipbuilding and marine engineering to reduce costs due to their higher deposition efficiency compared to solid wires. In add...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/36
Inventor 潘登
Owner HAINING RUIAO METAL TECH CO LTD
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