Twisted-type submerged-arc flux-cored wire with high efficiency and crack resistance and preparation method thereof

Abstract

The invention discloses a twisted-type submerged-arc flux-cored wire with high efficiency and crack resistance and a preparation method thereof. The twisted-type submerged-arc flux-cored wire is formed by spirally twisting at least seven steel strips coated with flux-cored powder, wherein the flux-cored powder comprises the following components of, in percentage by mass, 0.08%-0.18% of carbon, 1.0%-2.0% of manganese, 0.3%-1.2% of silicon, less than or equal to 0.03% of phosphorus, less than or equal to 0.03% of sulfur, 5.0%-6.2% of chromium, 0.7%-1.5% of tungsten, 0.8%-1.6% of molybdenum, 0.1%-0.7% of vanadium, 0.02%-0.05% of niobium and the balance iron and inevitable impurity elements. The twisted-type submerged-arc flux-cored wire is formed by spirally twisting a plurality of thin flux-core monofilaments, can be made into thicker welding wires with good coiling performance and is convenient to transport, storage and welding, the current and the voltage required by welding is relatively small, a larger welding speed is achieved under the condition of the same welding standard, the hardness of the prepared surfacing layer is medium, the crack sensitivity is low, and the crack resistance is excellent.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a stranded submerged arc chemical which is suitable for surfacing welding of large rolls (cold and hot support rolls or pinch rolls) or welding of extra-thick steel plates and has both high efficiency and excellent crack resistance Cored wire and method of making same. Background technique [0002] In the past ten years, the submerged arc surfacing in the welding industry has been facing a major problem, that is, the wear and repair of large rolls. Large rolls in metallurgical industry steel mills are often worn when rolling large extra-thick steel plates (such as extra-thick steel plates for aircraft carriers), and it is often necessary to use surfacing welding to repair the roll surface. Welding wire + HJ107 flux is similar to the submerged arc surfacing process. [0003] The diameter of large rolls can reach more than 2000mm, and the thickness of the s...

AI Technical Summary

Problems solved by technology

The current large-scale roll surfacing repair process consumes a lot of energy, has a long cycle and high production costs

In addition, the roll surface of large-scale roll repair requires high hardness and wear resistance, so the welding wire for submerged arc surfacing generally contains alloy elements such as W, Mo, V, etc. to improve hardness and corrosion resistance; but as surfacing welding As the work progresses, the welding residual stress gradually accumulates, which will lead to thermal cracks in the surfacing layer, and even cracking or peeling of the welding layer, resulting in the scrapping of the workpiece

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