Novel electric welding rod

Abstract

The invention provides an electric welding rod with ultra low hydrogen and high toughness. The electric welding rod comprises core welding-wires and electrode coating composition. The electrode coating composition comprises the following components (weight percentage): 38-42 percent of marble, 21-28 percent of fluorspar, 1-3 percent of white titanium pigment, 6-10 percent of ferrotitanium, 0.5-1.5 percent of low-carbon ferromanganese, 3-7 percent of ferrosilicon, 3-6 percent of manganese metal, 2-4 percent of metallic chromium, 1-3 percent of mica, 1-3 percent of ferromolybdenum, 1.5-3.5 percent of ferrovanadium, 1-4 percent of nickel powder and 2-4 percent of rare earth metal. H08A is adopted as the core welding-wires, and water glass is used as the cementing agent. The electric welding rod fills the blank of electric welding rod needed for an ultra-thin large diameter circular saw blade, and simultaneously the electric welding rod can also be used for the welding of products in structures of carbon tool steel, alloy tool steel and spring steel material. The electric welding rod has good welding processing property and crack resistance, and simultaneously has very high welding strength, rigidity, plasticity and toughness, and the color of the welding seam is identical with the color of the base material.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a new type of welding rod. Specifically, it provides a welding rod with ultra-low hydrogen and high toughness, which is especially suitable for welding large saw blades. At the same time, the welding rod can also be used for carbon Welding of tool steel, alloy tool steel and spring steel structural products. Background technique [0002] Circular saw blades are mainly used for sawing steel, stone and wood, and large diameter saw blades are mainly used for sawing larger volumes of steel and stone. This type of saw blade is characterized by large diameter and thin thickness (the thickness is generally below 18mm, and the diameter is between Φ2800mm-Φ5200mm). According to the shape and structure of the product (see figure 1 ) characteristics and the use of industrial and mining conditions require the base material of the product to have high strength, rigidit...

AI Technical Summary

Problems solved by technology

J807 and J857 belong to high-strength structural steel welding electrodes, which have good welding process performance, high strength and rigidity, and the color of the weld metal and the base material is also close, but the plasticity and toughness are low, and the crack resistance is poor, so It is also difficult to meet the requirements of welding saw blades

J807RH and J857RH belong to low-alloy structural steel welding electrodes with ultra-low hydrogen and high toughness, which have good welding process performance, high strength and good toughness. According to the welding proof, although it is low hydrogen and high toughness, the crack resistance of welding large saw blades is not enough, and because there are more non-ferrous alloy elements added to the welding rod, there are still some differences in the color of the weld metal and the saw blade substrate. So tabs for saw welding are still not ideal

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