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Flux-cored wire used for welding high strength structure steel plate

A technology for structural steel plates and welding wires, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as insufficient mechanical properties of weld metal, and achieve excellent mechanical properties, high purity of weld metal, and pure high degree of effect

Active Publication Date: 2009-12-09
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a flux-cored welding wire for high-strength structural steel plate welding, which solves the problem of insufficient mechanical properties of the weld metal that cannot be solved in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: 32% of fluorite; 2% of sodium fluoride; 1% of potassium cryolite; 2% of potassium titanate; 3% of potassium feldspar; 3% of rutile; 14%; molybdenum iron powder 6%; boron iron 0.1%; rare earth silicon 3%; titanium iron 6%; nickel powder 14%; iron powder 8%. Mix the above raw materials evenly according to the formula ratio and dry them, then add them into the ∪-shaped groove of the SPCC steel strip according to a certain filling rate, and then produce Φ1.6mm flux-cored welding wire through rolling, closing and drawing, using the following Welding process welding deposited metal test plate: welding current 320A, welding voltage 28V, welding gas 100% CO 2 , The protruding length is 18mm, the welding speed is 6mm / s, the preheating temperature is 150°C, and the interlayer temperature is 150±10°C. The test results of mechanical properties of deposited metal are as follows: σs840Mpa; σb910Mpa; δ17%; Ψ56%; -20℃Akv105J.

Embodiment 2

[0010] Example 2: fluorite 36%; sodium fluoride 1%; potassium cryolite 2%; potassium titanate 2%; potassium feldspar 2%; zircon sand 3%; micro-carbon ferrochrome powder 4%; low-carbon manganese Iron powder 14%; molybdenum iron powder 4%; boron iron 0.1%; rare earth silicon 3%; titanium iron 6%; nickel powder 10%; iron powder 13%. Mix the above raw materials evenly according to the formula ratio and dry them, then add them into the ∪-shaped groove of the SPCC steel strip according to a certain filling rate, and then produce Φ1.6mm flux-cored welding wire through rolling, closing and drawing, using the following Welding process welding deposited metal test plate: welding current 330A, welding voltage 29V, welding gas 100% CO 2 , The protruding length is 18mm, the welding speed is 6mm / s, the preheating temperature is 150°C, and the interlayer temperature is 150±10°C. The mechanical properties test results of deposited metal are as follows: σs720Mpa; σb830Mpa; δ19%; Ψ63%; -20℃Akv...

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Abstract

The invention is a flux-cored wire used for welding high strength structure steel plate. The proportioning of the flux-cored wire is as following by weight percentage: 30-50% of fluorite, 2%-5% of one or more than one of the sodium fluoride, sodium cryolite and potassium cryolite, 1%-3% of potassium titanate, 2%-6% of potassium feldspar, 2%-6% of one or two of the rutile and zircon sand, 3%-6% of Cr converted by alloy powder containing chrome such as light carton chromium and steel powder, metal manganese powder and the like, 9%-14% of Mn converted by alloy powder containing manganese such as light carbon manganese and steel powder, metal manganese power and the like, 3%-6% of Mo converted by alloy powder containing molybdenum such as molybdenum and steel powder, metal molybdenum powder and the like, 0.04%-0.1% of B converted by ferroboron or B2O3, 2%-5% of rare earth silicon, 2%-6% of ferrotitanium, 14%-18% of nickel powder, and the rest being ferrous powder. The flux-cored wire in the invention is a basic slag system of which the welding metal has high purity, adopts multi-element alloy by which the metallographic structure of the weld metal is acicular ferrite and the weld metal has fine mechanical property, and is suitable for welding the steel plate at Q690-Q800 strength grading.

Description

technical field [0001] The invention belongs to the technical field of structural steel welding, and in particular provides a flux-cored wire for welding high-strength structural steel plates, which is suitable for welding steel plates with a tensile strength of 700-900Mpa. Background technique [0002] At present, the strength level of domestic construction machinery steel is continuously increasing, and the application scope of high-strength steel plates such as Q690-Q800 is gradually expanding. However, the market supply of welding materials matching high-strength The material has poor mechanical properties of welded joints, mainly in the low elongation of the weld metal and low low-temperature impact toughness. In order to solve the above problems, a flux-cored wire variety with excellent mechanical properties has been researched and developed. [0003] There are three kinds of slag systems used in flux cored wire: acid slag system, basic slag system and metal slag syste...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/362
Inventor 张飞虎郭占山陈延清董现春周丹津
Owner SHOUGANG CORPORATION
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