A melting nozzle electroslag welding method and its arc extinguishing device

Abstract

The invention discloses a consumable nozzle electroslag welding method and an arc quenching device thereof. The method comprises the following steps that a vertical through hole is formed in an arc quenching block, and horizontal through holes communicating with the vertical through hole are formed in the side face of the arc quenching block; to-be-welded workpieces are placed in an assembled manner through a welding gap, and the arc quenching block and an arc striking block are arranged at the upper end and the lower end correspondingly; a consumable nozzle is inserted in the welding gap through the vertical through hole, a welding wire is inserted into the consumable nozzle to make contact with the arc striking block for arc striking, continuous wire feeding is conducted, soldering fluxis smelted, a slag pool is formed, and a molten pool located below the slag pool is formed through melting of the welding wire, the consumable nozzle and the to-be-welded workpieces; continuous welding is conducted till the slag ascends and flows out of the horizontal through holes, it is observed that the molten pool ascends to the upper end faces of the to-be-welded workpieces from the verticalthrough hole, arc extinguishing is conducted, and welding is stopped. The arc extinguishing block mounting and dismounting time is saved, the arc extinguishing time is convenient to control, and the welding quality is improved. Before arc striking, the end portion of the consumable nozzle and the end portion of the welding wire make contact and rub with base metal many times, and the arc strikingsuccess rate is high. After welding interruption, a plurality of welding wire sections are used for arc striking, and the arc striking success rate is high.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a nozzle electroslag welding method and an arc extinguishing device. Background technique [0002] Nozzle electroslag welding uses the resistance heat generated by current passing through high-temperature liquid slag as a heat source to melt the workpiece (steel plate, casting, forging) and filler metal (welding wire, melting nozzle) to be welded, and the molten metal is in the form of droplets Through the liquid slag pool, it gathers in the lower part of the slag pool to form a molten metal pool. Due to the continuous feeding and melting of the welding wire, the molten metal pool continues to rise, and the metal in the lower part of the molten pool gradually moves away from the heat source and gradually solidifies to form a weld. Nozzle electroslag welding has the advantages of being suitable for thick workpieces, no need to process grooves, and small welding deformation. It i...

AI Technical Summary

Problems solved by technology

Lead to a decline in welding quality, resulting in a great waste of manpower, material and financial resources

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