Ultra-low hydrogen, anti-moisture absorption welding electrode with seamless flux-cored wire as welding core and preparation method

Abstract

The invention relates to an ultra-low-hydrogen, moisture-absorption-resistant electric welding electrode whose welding core is a seamless flux-cored wire and a preparation method thereof, belonging to the field of welding materials. The electric welding electrode includes a welding core and a coating; the welding core includes a skin and a coating Core; the components and content of the drug core are: nickel 20‑26%, chromium 3‑5%, molybdenum+tungsten 1‑1.5%, graphite 0.5‑1%, potassium carbonate 2‑4%, potassium titanate 1‑ 3%, the rest is reduced iron powder; the components and contents in the coating are: marble 25‑33%, barium carbonate 10‑16%, fluorite 25‑30%, sodium fluoride 3‑5%, magnesium fluoride 1‑4%, phlogopite 2‑4%, quartz 4‑7%, titanium iron 5‑8%, rare earth ferrosilicon 3‑6%, manganese 2‑4%, CMC 1‑2%. The welding electrode has stable arc, clear molten pool, easy slag removal, extremely low diffusible hydrogen, good moisture absorption resistance and good low-temperature toughness, and can meet the welding requirements of 690MPa grade steel.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an ultra-low hydrogen, moisture-absorption-resistant welding electrode whose welding core is a seamless flux-cored welding wire and a preparation method thereof. Background technique [0002] With the gradual development of engineering equipment in the direction of large-scale, high-parameterization, and lightweight, steel plates with a yield strength of 690MPa have gradually replaced steel plates with a yield of Q460, and have been widely used in marine engineering, mechanical engineering, and hydropower. The steel plate with a yield strength of 690MPa contains more alloying elements such as Ni, Cr, Mo, etc., and has a large carbon equivalent, so it is easy to produce hardened structures during welding. Hydrogen-induced cracking. Hydrogen-induced cracks have delayed properties and generally appear hours, days or longer after welding, so they are extremely ...

AI Technical Summary

Problems solved by technology

Arcing agents generally contain K 2 O, Na 2 Easily ionized substances such as O, which are very easy to absorb moisture, adding a large amount will lead to an increase in the diffusion of hydrogen in the deposited metal

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