A kind of sintering flux for welding high-strength steel in marine engineering and preparation method thereof

Abstract

The invention discloses sintered flux for welding of high-strength steel for ocean engineering and a preparation method of the sintered flux. The sintered flux belongs to fluoride-basic type sintered flux and is prepared from components in parts by weight as follows: 19-24 parts of MgO, 20-25 parts of CaF2, 12-16 parts of Al2O3, 4-8 parts of SiO2, 8-10 parts of CaO, 2-4 parts of BaO, 1-3 parts of NaF, 1-3 parts of LiF, 1-2 parts of ZrO2, 2-3 parts of Fe2O3, 0.5-1.5 parts of an alloy and 14-16 parts of water glass. The sintered flux has good manufacturability, has arc stability under broader process specification, can meet requirements for welding of E550 steel plates with yield strength higher than 550 MPa and E690 steel plates with yield strength higher than 690 MPa and has lower diffusible hydrogen, slag removal is easy, and welding bead forming is attractive.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a sintered flux used for welding high-strength steel in marine engineering and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, the demand for oil is also increasing. Due to the rapid decline of my country's onshore oil resources, offshore oil and gas development has become a hot spot in my country's energy development. Since my country entered the field of offshore oil platform drilling in the 1950s, after half a century of hard work, my country has made great progress in the fields of offshore drilling and marine equipment manufacturing. Due to the harsh working environment of marine equipment, the requirements for steel used in marine engineering and its supporting welding consumables are relatively high. At present, steel plates with a yield strength of 550MPa and 690MPa have been localized,...

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Problems solved by technology

So far, domestic and foreign technologies related to submerged arc welding flux for high-strength steel on offshore engineering platforms are not perfect. A high-toughness and low-hydrogen type sintered flux for marine engineering and its manufacturing method (application number 201510577473.2), the patent invention is mainly used For the welding of steel with a yield strength of 460MPa for marine engineering, the scope of use is limited, and it is not suitable for steel plates with a yield strength of 550MPa and 690MPa. Therefore, it is very important to research and develop sintered flux for welding high-strength steel in marine engineering

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