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A high-strength and toughness flux-cored wire material for fcb method automatic welding

A flux-cored wire and flux-cored technology, applied in welding/cutting media/materials, welding equipment, welding media, etc., can solve the problems of reduced weld metal toughness, grain growth, and low-temperature impact toughness values ​​that cannot meet the requirements. , to achieve the effect of improving strength and toughness, and improving efficiency

Active Publication Date: 2017-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the present situation that the crystal grains of the weld metal in the large input energy submerged arc welding of the FCB method are seriously grown, resulting in a significant decrease in the toughness of the weld metal, and the low-temperature impact toughness value cannot meet the requirements. A flux-cored wire material is invented. It is to effectively improve the strength and toughness of the weld metal of FCB large input energy submerged arc welding

Method used

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  • A high-strength and toughness flux-cored wire material for fcb method automatic welding
  • A high-strength and toughness flux-cored wire material for fcb method automatic welding
  • A high-strength and toughness flux-cored wire material for fcb method automatic welding

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Embodiment approach

[0037] 1). The drug core powder is mixed with alloy powder, and various alloy powders are sieved to ensure that the particle size of the alloy powder is 80-100 mesh. Weigh according to the formula ratio, stir and homogenize repeatedly.

[0038] The formula ratio of each alloy powder is: silicon-calcium alloy (Ca28Si60) 1.0-3.0%, electrolytic manganese 2.0-4.0%, 50% ferrovanadium 0.5-1.0%, 25% ferro-titanium 0.5-1.0%, 62% CrN 0.3-0.8% , 55% ferromolybdenum 2.0-4.0%, 99 oxide rare earth Ce1.0-2.5%, atomized iron powder 83-93%.

[0039] 2). Dry the stirred and homogenized alloy powder at 80°C and keep it warm for 1 to 2 hours to remove the moisture and moisture in the alloy powder.

[0040] 3). On the flux-cored wire production line, add the baked alloy powder into a U-shaped groove made of a commercially available SPCC cold-rolled steel coil with a thickness of 1.0 mm and a width of 18.5 mm.

[0041] 4). The flux core rate coefficient of the flux cored wire is 25%, and the err...

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Abstract

The invention discloses a high-strength and high-tenacity flux-cored wire material for high-linear-energy submerged automatic welding based on FCB. The high-strength and high-tenacity flux-cored wire material is used for refining crystal grains of weld metal with heat input being larger than 150KJ / cm during welding and improving the strength and tenacity of the weld metal. The flux-cored wire material is made of a SPCC steel strip sold on the market and is wrapped in various alloy powder. The various alloy powder in which the flux-cored wire material is wrapped includes calcium silicon, electrolytic manganese, ferrovanadium, ferrotitanium, chromium nitride, ferromolybdenum, oxide rare earth cerium and atomized iron powder. According to the high-strength and high-tenacity flux-cored wire material, the nitride of Ti and V and the sulfide of Ce are taken as particles for refining the weld metal, in this way, migration of an austenite crystal boundary and growth of grains are delayed, austenite grains are refined, ferrite is induced to form a core in the austenite, and then the weld metal is refined. The high-strength and high-tenacity flux-cored wire material is mainly used for welding splicing plates of a planar segmented assembly line for ships, when flat butt weld joints of the large splicing plates with the thickness ranging from 10 mm to 40 mm according to FCB, single-faced welding and double-faced forming can be achieved, a workpiece does not need to be turned, and compared with double-faced submerged automatic arc welding, the efficiency can be improved by three to five times.

Description

technical field [0001] The invention relates to a welding wire material, in particular to a high-strength and high-toughness flux core material used in FCB method large input energy submerged arc automatic welding. The flux-cored welding wire material of the invention is used for FCB submerged arc automatic welding, can significantly refine the grains of the weld metal, and greatly improve the strength and toughness of the weld metal. [0002] technical background [0003] The FCB method (Flux Cooper Backing, referred to as the FCB method) is also known as the flux copper backing method. It evenly lays a 4-6mm thick backing flux on a plate-shaped copper plate, and uses an inflatable hose top pressure device to connect it with the steel plate. The back side is closely attached, and then the surface flux is piled up on the front side of the groove, and the front side is welded to form the back weld seam at the same time. The welding method of single-sided welding and double-sid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
CPCB23K9/18B23K35/0266B23K35/368
Inventor 余圣甫闫宁浦娟
Owner HUAZHONG UNIV OF SCI & TECH
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