A Ni-based welding rod for 9% Ni steel for overhead welding

Abstract

The invention discloses a nickel-based electrode for overhead welding with 9% Ni steel, which is composed of a welding core and a coating, the coating is coated on the outer wall of the welding core, and the coating accounts for 0.3 to 0.5 of the total weight coefficient of the welding rod; The welding core adopts nickel-chromium-iron welding core; the composition of the coating adopts high alkalinity CaCO 3 ‑MgCO 3 ‑CaF 2 Low hydrogen residue system. The invention has excellent weldability in all positions, especially in the overhead welding position, and extremely low porosity of the overhead welding film. The welding rod of the invention has excellent welding performance for overhead welding, stable arc, excellent slag removal and excellent weld formation; the welding rod has extremely low welding porosity for overhead welding, and the pass rate of high-definition radiographic flaw detection TOFD filming for overhead welding can reach more than 99.5%.

Description

Technical field [0001] The present invention belongs to the field of welding materials, and more particularly to a special 9% Ni steel supporting nickel-based electrode for blematt welding. Background technique [0002] With the global industrialization, the information process has accelerated, and countries around the world have grown sharply, while seriously restricting energy shortages of sustainable economic development, coal-fired pollution and other issues are also exposed. As quality cleaning fuel and important chemical raw materials, natural gas has become one of the three major pillar energy in the world. In the past 10 years, natural gas has become a steady growth in social development. Global natural gas production and consumption have a steady growth situation. It is expected that 40% of global natural gas trade volume will be liquefied natural gas LNG (Liquefied Natural GAS). The development of LNG has driven the development of the LNG industry, and the LNG industry ...

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Problems solved by technology

[0004] With the adjustment of my country's energy strategy, the LNG industry has maintained a momentum of rapid development in my country. The development of the LNG industry has greatly increased the demand for 9Ni steel and 9Ni steel welding materials. However, this material mainly relies on imports. In recent years, domestic The research and development of 9% Ni steel electrodes by various large-scale welding consumables companies has made certain breakthroughs and progress, but the problem of porosity in overhead welding of 9% Ni steel electrodes is an important bottleneck that restricts the localization of domestic 9% Ni steel electrodes.

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