High-strength and high-toughness low alloy steel electric welding rod

Abstract

The invention publishes a high-strength and high-toughness low alloy steel electric welding rod, which consists of a core and a covering, wherein the covering is coated on the outer wall of the core, and the weight factor of the covering in the total weight of the welding rod is 0.4-0.5; the core comprises the following components in percentage by weight: 0.01-0.08 percent of C, 0.10-0.25 percent of Si, 0.30-0.55 percent of Mn, 0.005-0.20 percent of Cr, 0.005-0.30 percent of Ni, 0.007-0.012 percent of P, 0.007-0.012 percent of S and the balance of Fe; and the covering is of a basic slag system and comprises the following components in percentage by weight: 20-30 percent of calcium carbonate, 1-5 percent of magnesium carbonate, 5-10 percent of barium carbonate, 10-20 percent of calcium fluoride, 1-8 percent of cryolite, 1-5 percent of barium fluoride, 3-8 percent of rutile, 1-5 percent of titanium white, 2-10 percent of silicon dioxide, 5-10 percent of electrolytic manganese, 2-5 percent of ferrosilicon, 4-8 percent of nickel powder, 1-3 percent of chromium powder and 1-3 percent of molybdenum powder. The welding rod is adopted for welding; the strength of a welded joint is 800 MPa; the impact energy at -50 DEG C is greater than 60 J; the diffusible hydrogen content is 2-3 ml / 100 g; and the electric welding rod is mainly applied to welding of 80 kg of low alloy steel structure.

Description

Technical field

[0001] The invention relates to the field of welding materials, in particular to a manual electric welding electrode for 80 kilograms of high-strength steel. Background technique

[0002] With the further development of the machinery industry and manufacturing industry, in order to improve the performance of steel structure products, a large number of high-strength steels are used, which greatly increases the demand for matching welding materials. Generally speaking, as the strength of welding materials increases, the impact toughness of deposited metals will decrease. How to balance the two has always been the goal pursued. Summary of the invention

[0003] In order to overcome the above shortcomings, the present invention provides a high-strength, high-toughness, low-alloy steel welding electrode, suitable for AC and DC dual use, excellent all-position welding performance, stable arc, no arc phenomenon, small spatter, and easy slag removal.

[0004] The technical ...

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