High-toughness sintered flux for submerged-arc welding, and preparation method thereof

Abstract

The invention relates to a high-toughness sintered flux for submerged-arc welding. The high-toughness sintered flux comprises dry powder and a binding agent, wherein the dry powder comprises the components by weight percent: 20-30% of dead-burned magnesite, 20-30% of corundum, 10-20% of fluorite, 10-20% of wollastonite, 1-3% of lithium oxide, 4-8% of rutile, 2-4% of silicon iron, 1-3% of ferrotitanium, 1-3% of manganese metal, 1-5% of diboron trioxide and 1-3% of rare earth fluoride; potash water glass is adopted as the binding agent. The sintered flux is good in welding technology performance. When being used for welding, the high-toughness sintered flux is stable in electric arc, attractive in weld joint formation and moderate in weld joint infiltration angle, and enables slag at the bottom layer in a groove of a thick plate to be very easily cleaned. The high-toughness sintered flux can be matched with most carbon steel welding wires for use, is good in comprehensive mechanical properties, and especially has higher low temperature impact toughness.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a high-toughness sintered flux for submerged arc welding and a preparation method thereof. Background technique [0002] Submerged arc welding can use smelting flux and sintering flux with the corresponding welding wire for structural welding. The smelting flux has the disadvantages of large energy consumption and large metal burning loss, and the scope of use is continuously shrinking. Small and other characteristics, is constantly expanding the scope of application. At the same time, with the improvement of production efficiency, production process automation and mechanization requirements of enterprises, submerged arc welding has become one of the commonly used welding methods for low-alloy high-strength steel structures, especially in the welding process of large thick plate long welds, submerged arc welding advantage is more obvious. Therefore, th...

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Problems solved by technology

Therefore, the research on sintered flux for submerged arc welding is very urgent. At present, most flux research focuses on the following two aspects: 1. The improvement of the mechanical properties of deposited metal or weld metal, such as ( Patent No.: CN102363252A) a sintered flux with low alkalinity and high toughness; (Patent No.: CN101314200) a high-strength and high-toughness fluorine-alkaline sintered flux. One layer of slag removal effect is not enough

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