A 1500mpa grade ultra-high-strength steel non-copper-coated solid core welding wire for gas shielded welding

Abstract

The invention discloses a gas shielded welding no-plated-copper solid welding wire for 1500 MPa-grade ultrahigh-strength steel. The welding wire has the tensile strength of more than 1500 MPa, the yield strength of more than 1350 MPa, the percentage elongation after fracture of more than 12% and the -20 DEG C impact power of more than 60 J, and is excellent in welding process performance, stable in electric arc, low in splashing and suitable for the rich-argon gas shielded welding of 1500 MPa-grade ultrahigh-strength steel; and a welding line is excellent in mechanical performance. The welding wire has no plated copper on the surface, can reduce the welding defects, and is economical and environment-friendly.

Description

technical field [0001] The invention relates to a welding wire for ultra-high-strength steel welding, in particular to a non-copper-coated solid-core welding wire for gas-shielded welding of 1500MPa-class ultra-high-strength steel. Background technique [0002] With the rapid development of construction machinery manufacturing and the popularization of lightweight design of steel structural parts, ultra-high-strength steel plates with a tensile strength of 1500MPa are gradually applied to large-scale welded components, mainly thin gauge, and mostly used for irregular weld bead. On the key parts, and most of them are welded by gas shielded welding, and the proportion of solid welding wire is relatively large. In order to ensure the mechanical properties of welded joints, the matching principle of "equal strength and equal toughness" is generally adopted in the selection of welding materials, that is, the strength of the weld metal is equivalent to the strength of the base met...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few types of solid welding wires for ultra-high-strength steel in my country, especially the matching welding wires for ultra-high-strength steel plates with a tensile strength of 1500MPa, and less technical research, such as the national standard GB / T8110-2008 "Carbon Steel for Gas Shielded Arc Welding" , Low-alloy steel welding wire "The highest strength level is only 830MPa, and it cannot be used in batches for welding 1500MPa ultra-high-strength steel plates

[0004] Most traditional solid wires are copper-plated on the surface. During the welding operation, the welding wire often rubs against the wire feeding hose and contact tip, and the coating is easy to fall off, resulting in blockage of the hose and contact tip, which affects work efficiency and welding quality. At the same time, Part of the copper melts into the weld, which can easily lead to cracks in the weld and even deteriorate the impact toughness

Copper is a heavy metal, which also has adverse effects on environmental protection and occupational health of workers during the production and use of welding wire