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An acidic high-strength and high-toughness flux-cored welding wire

A high-strength and high-toughness technology of flux-cored welding wire, applied in welding equipment, welding media, welding/cutting media/materials, etc., can solve problems such as low low-temperature impact toughness, easy generation of hydrogen-cooled cracks, and decreased toughness of welded joints. Achieve excellent welding performance, stable arc and less spatter

Active Publication Date: 2022-03-04
TIANJIN YONGCHANG WELDING WIRES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to its main characteristics, acidic flux-cored wire is widely used in various fields. However, in high-strength steel welding, acidic flux-cored wire has low low-temperature impact toughness, which directly leads to a decrease in the toughness of the welded joint, and hydrogen-cooled cracks are also very easy to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An acidic high-strength and high-toughness flux-cored welding wire, in which the steel strip is SPCC low-carbon steel strip, and the filling rate is 14%. The composition of the drug core is: 407 parts of rutile; 35 parts of feldspar; 20 parts of quartz; 15 parts of zircon sand; 10 parts of magnesia; 7 parts of sodium fluoride; 10 parts; magnesium powder 11 parts; silicon calcium alloy 7 parts; aluminum magnesium alloy 10 parts; 75# ferrosilicon 35 parts; rare earth ferrosilicon 20 parts; metal manganese 164 parts; nickel powder 145 parts; parts, iron powder 19 parts. Flux core powder and low-carbon SPCC steel strip are made into φ1.2 flux cored wire through baking, rolling, drawing, layer winding and other processes.

[0044] In this embodiment, the protective gas is carbon dioxide gas, the welding current is 220-260A, the welding voltage is 28-30V, the welding line energy is 10-15KJ / cm, the welding test plate is 20mm thick, and the isolation layer is welded according ...

Embodiment 2

[0048] An acidic high-strength and high-toughness flux-cored welding wire. Except as follows, all the other are the same as embodiment 1.

[0049] Among them, the steel strip adopts SPCC low-carbon steel strip, and the filling rate is 15%. The composition of the drug core is: 380 parts of rutile; 32 parts of feldspar; 20 parts of quartz; 14 parts of zircon sand; 9 parts of magnesia; 7 parts of sodium fluoride; 9 parts; magnesium powder 10 parts; silicon calcium alloy 7 parts; aluminum magnesium alloy 8 parts; 75# ferrosilicon 33 parts; rare earth ferrosilicon 19 parts; metal manganese 153 parts; nickel powder 135 parts; parts, iron powder 83 parts.

[0050] In the welding process of this embodiment, there is less spatter, the weld seam is beautifully formed, slag is easy to remove, and all-position welding is better. Analyze the chemical composition and mechanical properties of the weld metal after welding. The chemical composition of the deposited metal is: C: 0.063wt%, M...

Embodiment 3

[0053] An acidic high-strength and high-toughness flux-cored welding wire. Except as follows, all the other are the same as embodiment 1.

[0054] Among them, the steel strip adopts SPCC low-carbon steel strip, and the filling rate is 16%. The composition of the drug core is: 360 parts of rutile; 30 parts of feldspar; 20 parts of quartz; 14 parts of zircon sand; 9 parts of magnesia; 7 parts of sodium fluoride; 9 parts; magnesium powder 10 parts; silicon calcium alloy 6 parts; aluminum magnesium alloy 7 parts; 75# ferrosilicon 30 parts; rare earth ferrosilicon 18 parts; metal manganese 144 parts; nickel powder 127 parts; parts, 132 parts of iron powder.

[0055] In the welding process of this embodiment, there is less spatter, the weld seam is beautifully formed, slag is easy to remove, and all-position welding is better. Analyze the chemical composition and mechanical properties of the weld metal after welding.

[0056] The chemical composition of the deposited metal is: C...

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Abstract

The invention provides an acidic high-strength and high-toughness flux-cored welding wire, which includes a flux core and a sheath coated on the outside of the flux core; the flux core includes the following components in parts by weight: 300-430 parts of rutile; 20-430 parts of feldspar 40 parts; 13-25 parts of quartz; 8-20 parts of zircon sand; 4-14 parts of magnesia; 3-10 parts of sodium fluoride; 5-13 parts of iron; 5-15 parts of magnesium powder; 2-9 parts of silicon-calcium alloy; 3-11 parts of aluminum-magnesium alloy; 22-40 parts of ferrosilicon; 14-25 parts of rare earth ferrosilicon; 110-150 parts of nickel powder; 45-70 parts of ferromolybdenum; 3-12 parts of graphite, iron powder balance; the sum of the parts by weight of each powder component is 1000 parts. The acidic flux-cored welding wire of the present invention still has relatively high low-temperature impact toughness and good cold cracking resistance at relatively high strength.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an acidic high-strength and high-toughness flux-cored welding wire. Background technique [0002] With the vigorous development of our country's economy, the demand for high-grade and high-quality steel products is becoming increasingly strong. In consideration of reducing self-weight, increasing bearing capacity, facilitating transportation and installation, and reducing manufacturing costs, it is imperative to adopt higher-strength new steel and supporting high-toughness welding materials. The increase of the strength level will lead to the deterioration of its weldability. Its carbon equivalent is large, its strength is high, and it is prone to problems such as welding cracks and welding stress. During the welding process, due to the difference in heat input and post-weld cooling rate, the heat affected zone Softening and embrittlement are prone to occur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/36
CPCB23K35/0266B23K35/3601
Inventor 侯云昌白英华许立宝周秀穆丽娟
Owner TIANJIN YONGCHANG WELDING WIRES
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