Weather-resistant gas-shielded solder wire

Abstract

The present invention relates to a weather-resistant gas shielded welding wire, its chemical components are (by mass percentage):C less than or equal to 0.10, Si less than or equal to 0.6, Mn 1.2-1.6, S less than or equal to 0.030, P less than or equal to 0.030, Cu 0.10-0.60, Gr 0.30-0.90, Ni 0.20-0.60, Ti 0.03-0.12 and the rest is iron powder, in which the optimized range of described Ni is 0.30-0.50. Besides, it contains no elements of B and Re. The deposited metal and welded joint obtained by said invented welding wire have good atmospheric corrosion resistance, at the same time have good comprehensive performance, specially, its low-temp. impact toughness at -40 deg.c is good. The comprehensive performance of deposited metal obtained by said invented welding wire is good, its yield strength is greater than or equal to 450 MPa, tensile strength is greater than or equal to 550 MPa, its extensibility is greater than or equal to 450 MPa, strength is greater than or equal to 550 Mpa, its extensibility is greater than or equal to 220%, and AKv (under the condition of -40 deg.C) is greater than or equal to 100 J.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a weather-resistant gas-shielded welding wire with a yield strength of 450 MPa. Background technique [0002] Gas shielded welding has become a major and efficient welding method for steel structure manufacturing, and currently occupies a very high proportion in many manufacturing industries. What kind of performance the gas shielded welding wire has is directly related to the comprehensive performance and safety of the entire welding structure, such as mechanical properties, atmospheric corrosion resistance, low temperature impact performance, etc. [0003] Chinese patent 95108258.2 discloses "a gas-shielded welding wire", which is characterized by being suitable for welding low-alloy steel. The chemical composition formula of the welding wire is as follows: C≤0.12%, Si: 0.3-0.9%, Mn: 1.0-1.2% , S: ≤0.025%, P ≤0.025%, Ni: 0.5-1.5%, Mo: 0.1-0.6%, Ti: 0.05-0.2%, Zr: 0.01-0.1%. I...

AI Technical Summary

Problems solved by technology

Its main advantages are good weld performance, high welding strength and obvious use effect at negative temperature; its yield strength reaches 450MPa; it has good low temperature impact performance -40℃, A kv ≥50J; but it is not weather resistant

[0004] Chinese patent 01133651.X discloses "high toughness gas shielded welding wire for low alloy high strength steel", its chemical composition is as follows: C: 0.05~0.12%, Si: 0.30~1.2%, Mn: 1.2~2.0%, Ni: 0.6~ 1.6%, Cu: 0.10~0.50%, Cr: 0.10~0.60%, Ti: 0.10~0.20%, B: 0.002~0.010%; the tensile strength of the weld metal is 700~800MPa, CVN impact toughness at -30℃ A kv ≥80J, has a certain weather resistance, but only suitable for welding high-strength steel, such as welding 700MPa low-alloy steel by MAG method