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

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...

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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

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