A flux-cored welding wire with increased penetration and its preparation method and application

Abstract

The invention discloses a flux-cored wire increasing fusion depth and a preparing method and application thereof. The flux-cored wire comprises powder and a pipe wall for wrapping the powder. The powder is prepared from, by mass, C with the content smaller than or equal to 0.12%, Si with the content smaller than or equal to 0.6%, Mn with the content smaller than or equal to 1.5%, 0.35-0.6% of Mo, S with the content smaller than or equal to 0.035%, P with the content smaller than or equal to 0.035%, 0-2.0% of K2CO3 powder, 0.5-1.5% of potassium permanganate powder, and the balance Fe and unavoidable impurities having no influence on the performance of the flux-cored wire. The fusion depth of the flux-cored wire is large, it is unnecessary to groove parent metal, or only a small groove needs to be formed in the parent metal, a large truncated edge is reserved, the amount of filling metal is reduced, and the welding productivity is greatly improved. Meanwhile, incomplete fusion welding defects are not prone to occurrence, and safety of the welding structure is improved.

Description

technical field [0001] The invention relates to a welding material, in particular to a flux-cored welding wire with increased penetration and its preparation method and application. Background technique [0002] With the rapid development of industrial technology, welded structures are developing in the direction of large-scale, high-parameterization, and high-strength toughness. High-strength toughness plates are more and more used in welded structures. At present, submerged arc welding and argon-enriched gas shielded welding are the main welding processes for medium-thick plates. Welding of medium and thick plates requires beveling, multi-layer and multi-pass welding, the welding production process is complicated, and the welding production efficiency is low. The publication number is CN103831541A invention patent "Laser-MIG arc hybrid welding method for high-strength steel butt joints", which uses laser-MIG arc composite heat source to increase penetration depth. This me...

AI Technical Summary

Problems solved by technology

Flux-cored wire has the advantages of stable arc, small spatter, and easy adjustment of chemical composition, but it has disadvantages such as complicated manufacturing process, high cost, and poor wire feeding performance as solid cored wire.

The wire feeding performance of solid wire is good, but its composition is difficult to adjust, the welding spatter is large, the arc stability is poor, and the penetration depth is shallow, especially the penetration depth of MIG welding is shallower. This increases the amount of filler metal and reduces welding productivity