Argon-filling-free backing welding rod for nickel-based alloys

Abstract

The invention discloses an argon-filling-free backing welding rod for nickel-based alloys. The argon-filling-free backing welding rod consists of a core wire and a coating, wherein an outer wall of the core wire is coated with the coating; an alkaline CaO-CaF2-TiO2-Zr2O3 low-hydrogen slag system and an ERNiCrMo-3 core wire are adopted; and major components of a deposited metal include 60 percent of Ni, 22 percent of Cr, 9 percent of Mo and 3.5 percent of Nb+Ta. The argon-filling-free backing welding rod has the advantages of superior one-side welding with back formation welding process performance, relatively high strength, tensile strength of the deposited metal being greater than or equal to 760MPa, high low-temperature impact toughness, impact energy average value of the deposited metalbeing greater than or equal to 80J at a temperature of 196 DEG C below zero, and superior pitting corrosion and inter-crystalline corrosion resistance, and is particularly suitable for the back-sideargon-filling-free one-side welding with back formation backing demand of the nickel-based alloys such as Incone1625 / 825; the cost of back-side argon filling is lowered; and superior joint quality isensured.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to an argon-free bottoming electrode for nickel-based alloys. Background technique [0002] With the rapid development of the national economy in recent years, the application of nickel-based alloys has become increasingly widespread. Nickel is an important non-ferrous metal with high strength and plasticity, and has good corrosion resistance to acid and alkaline environments. In addition, nickel-based alloys also have heat resistance and good high-temperature performance, so they are widely used in high-end fields such as energy fields, nuclear reactors, and aerospace. Nickel-based alloys refer to alloys based on nickel (Ni≥50%), containing other alloying elements, and resistant to corrosion in some media. There are mainly nickel, nickel-molybdenum (nickel-molybdenum-iron) alloy, nickel-chromium (nickel-iron) alloy, nickel-chromium-molybdenum and nickel-iron-chromium and so on. ...

AI Technical Summary

Problems solved by technology

However, on the one hand, this requires high welding technology, which leads to high welding costs. On the other hand, since the performance of the weld directly depends on the composition and properties of the welding wire, the requirements for wire smelting are very high, and the corresponding smelting costs are also high.

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