A kind of marine submerged arc welding combined sintering flux and preparation method thereof

Abstract

The invention discloses a marine submerged-arc welding composite sintered flux. The marine submerged-arc welding composite sintered flux comprises a surface welding flux and a lining welding flux. The surface welding flux is prepared from surface solder and water glass and formed by mixing MgO, Al2O3, CaO, BaF2, MnO, SiO2, TiO2, Fe powder, borax, rare earth ferrosilicon, ferrotitanium, ferromanganese, ferromolybdenum, metallic nickel powder and rare earth. The lining welding flux is prepared from lining solder and water glass and formed by mixing TiO2, SiO2, MgO, CaO, BaF2, MnO, Fe powder, borax, ferromolybdenum, metallic nickel powder and rare earth. The invention further discloses a preparing method of the marine submerged-arc welding composite sintered flux. According to the component formula, welding arcs are stable, the amount of smoke is small, formed weld joints are attractive, transition is smooth, welding beads are in order, and the defects such as undercut are avoided.

Description

Technical field: [0001] The invention relates to a high-efficiency welding process for hull planar segmental construction, in particular to a flux used in a multi-wire single-sided submerged arc automatic welding process with a flux copper lining method. In particular, it relates to a marine high-efficiency submerged arc welding combined sintering flux and a preparation method thereof. The marine high-efficiency submerged arc combined sintering flux can be applied to a double-electrode and multi-electrode high-efficiency submerged arc automatic welding process. Background technique: [0002] As the tonnage of ships increases, a large number of segmented construction methods are used in hull construction and then spliced. In the past, submerged arc automatic single-sided welding was used for splicing. However, due to the increase in plate thickness and joint length, the weight and occupied area of ​​the segments also increased, which brought great difficulties to the segmenta...

AI Technical Summary

Problems solved by technology

[0005] The difficulty of applying the FCB method welding process to thin plate welding is that it is difficult to obtain a good surface weld shape under the condition of multi-electrode high-speed welding. In addition, the steel plate is easily welded through due to the warping deformation of the steel plate, and it is difficult to obtain a good back surface. Weld Forming

The difficulty of applying FCB method welding process to thick plate welding lies in: the welding current is large, the heat input is high, and it is more difficult to obtain excellent weld shape and mechanical properties, especially when the plate thickness is close to 40mm, the welding current is as high as 1650A. Under severe welding conditions with a heat input of up to 260KJ / cm, it is difficult to obtain complete weld formation and excellent weld mechanical properties

Images