9% Ni steel matched nickel-based welding rod special for overhead welding

Abstract

The invention discloses a 9% Ni steel matched nickel-based welding rod special for overhead welding. The welding rod is composed of a welding core and a coating, wherein the outer wall of the weldingcore is coated with the coating, the coating accounts for 0.3-0.5% of the total weight coefficient of the welding rod, the welding core is a nickel-chromium-iron welding core, and the coating is composed of a CaCO3-MgCO3-CaF2 low-hydrogen slag system with high alkalinity. The welding rod has excellent all-position weldability, especially overhead welding position weldability, and extremely low overhead welding shooting porosity; and the welding rod has excellent overhead welding property, stable electric arc, excellent deslagging property and excellent weld joint forming property, the weldingrod has extremely low overhead welding porosity, and the overhead welding high-definition radiographic inspection TOFD shooting qualification rate can reach 99.5% or above.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a nickel-based welding rod matched with 9% Ni steel for overhead welding. Background technique [0002] With the acceleration of global industrialization and informatization, the demand for energy in countries around the world is increasing rapidly. At the same time, problems such as energy shortage and coal burning pollution, which seriously restrict the sustainable development of the economy, are also increasingly exposed. As a high-quality clean fuel and an important chemical raw material, natural gas has become one of the three pillar energy sources in the world today. In the past 10 years, the status and role of natural gas in social development have become increasingly prominent, and global natural gas production and consumption have shown a steady growth trend. It is estimated that by 2020, 40% of the global natural gas trade volume will be liquefied natural ga...

AI Technical Summary

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.

Images