A kind of nickel base welding rod for welding Monel alloy

Abstract

The invention discloses a nickel-based welding rod for welding a monel alloy. The nickel-based welding rod comprises a core wire and a coating, wherein the core wire comprises C not more than 0.03%, 2.00-5.00% of Mn, Si not more than 0.30%, 63.0-70.0% of Ni, Fe not more than 1.0%, Co not more than 0.015%, S not more than 0.010%, P not more than 0.015%, 0.010-0.50% of Ti, 0.001-0.30% of Al and Cu; and the coating comprises 2-5% of rutile powder, 30-45% of marble powder, 25-35% of fluorite powder, 4-8% of ferrotitanium powder, 4-8% of silica powder, 1.5-3% of titanium dioxide, 0.3-0.6% of sodium carbonate, 3-5% of electrolytic manganese, 2-6% of potassium titanate, 1-3% of ferrosilicon and 0.5-2% of silicon zirconium alloys. The nickel-based welding rod has good welding manufacturability, stable electric arc and excellent corrosion resistance.

Description

technical field [0001] The invention relates to a technology in the field of welding materials, in particular to a nickel-based electrode used for welding Monel alloy. Background technique [0002] Monel alloy is a nickel-based alloy mainly composed of metal nickel, supplemented by metal copper, and other elements such as iron and manganese are added. Its main alloy composition is (wt%): C≤0.03%, Mn≤2.0% , Si≤0.50%, Ni≤63.0%, Fe≤2.5%, S≤0.020%, P≤0.025%, Cu 28.0%-34.0%, and other impurities. The tensile strength of Monel 400 steel plate is 482-655MPa, the yield strength is 193-517MPa, the elongation is 50%-30%, the density is 8.80g / cm3, the elastic modulus is 26000ksi, and the heating energy is 0.427J / g-℃ , the thermal conductivity is 21.8W / m-K, the melting point is 1300°C-1350°C, and the magnetism is 200H (At70F). [0003] The structure of Monel alloy is a high-strength single-phase solid solution. It is a corrosion-resistant alloy with the largest amount, the widest appl...

AI Technical Summary

Problems solved by technology

Among them, the electrode coating of the acidic coating type uses rutile-fluorite-cryolite acidic slag system; this type of electrode slag shell has high hardness and poor crack resistance, and the tensile strength of the deposited metal after welding at room temperature (Rm), yield strength (Rp0.2), elongation (A) are low, and the mechanical properties of impact energy (AKV) at -196°C ultra-low temperature are all low.

The alkaline coating type electrodes, mainly marble and fluorite, have poor arc stability, poor fluidity of molten pool, poor uniformity of slag coverage, unclean slag removal, difficult to clean slag, and uneven weld formation.

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