Ultralow-hydrogen type high efficiency iron powder welding rod for low alloy high streagth steel

Abstract

An ultralow-hydrogen iron powder coated welding electrode for the high-strength low-alloy steel is composed of welding wire H08A or H08E and the coated layer prepared portionally from Fe powder, CaCO3, CaF2, Ti-Fe, feldspar, Mn powder, Ni powder, Cr-Fe, NaCO3 and sodium-water glass as adhesive.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to an ultra-low hydrogen type high-efficiency iron powder welding rod for low-alloy high-strength steel. Background technique [0002] High-efficiency iron powder electrode is a special electrode developed to improve welding efficiency, shorten welding time and reduce welding costs. Due to its good welding process and high welding efficiency, it is increasingly used in large-scale welding structures and shipbuilding industries. The wider the application. [0003] Domestic Patent Publication No. CN1056454A "Efficient Alkaline Low Hydrogen Type Iron Powder Electrode" is suitable for the welding field of alloy structural steel. It uses materials containing boron and titanium in the coating to inhibit the precipitation of pro-eutectoid ferrite, thereby obtaining The fine acicular ferrite achieves the purpose of improving the toughness of the weld. Its disadvantages: due to the...

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Problems solved by technology

Its disadvantages: due to the presence of boron in the weld, boron is easy to segregate at the grain boundary or subgrain boundary when the weld crystallizes, causing welding defects

[0005] The document "Comprehensive Discussion on the Performance of Efficient Electrodes E5024 and E5028" ("Welding Technology", No. 2, 1994) introduced several domestic and foreign high-efficiency iron powder electrodes, among which the acid iron powder electrodes listed in China, Japan, One for each of Sweden, and one for each of the listed alkaline low-hydrogen iron powder electrodes in China (E5028), Japan (LBI-52H) and Sweden (OKFemax33.48), but the deposited metal of these electrodes only contains The main alloy elements such as C, Mn, Si, etc. do not contain Ni, Cr, and the seawater corrosion resistance of welded joints after welding of marine ships and other marine structures is obviously not matched.