High-strength weather-resistant welding rod

Abstract

A sort of strong clime-withstanding welding rod is disclosed, whose coating content as follows, marble 35-40%, fluorite 15-20%, ferrotitanium 8-11%, mid-carbon Fe-Mn 3-8%, ferrosilicon 45%, synthesized isinglass(40 mesh) 2-3%, tiny ganister sand 2-4%, iron powder 12-20%, chrome 1-2%, copper powder 0.5-1%, nickel powder 1-2%, titanium pigment 4-8%. The fused metal and welded joint obtained by the invention has the good performance of withstanding clime and comprehensive performance, especially at -40deg.C it has good low temperature impact toughness, yield strength>=450MPa, tensile strength>=550MPa, elongation rate >=22%, Akv>=100j.

Description

Technical field [0001] The invention relates to the field of welding materials; in particular, it relates to a matching electrode for weathering steel with a yield strength of 450MPa. Background technique [0002] At present, there is no high-strength, high-toughness, weather-resistant electrode with yield strength ≥450MPa, tensile strength ≥550MPa, and CVN impact toughness Akv≥100J at -40°C. [0003] Common weathering steel electrodes are: Cu-P, Cr-Cu, Ni-Cu, W-Cu, Cr-Ni-Cu alloy series. Because of its high content of P, Cu-P series electrodes have poor toughness and weldability and are less used. On the one hand, the elements of Cr and Ni are relatively expensive and require reasonable and economical contents; on the other hand, the alloys of Cr-Cu, Ni-Cu, and W-Cu cannot be matched well with the high-strength weathering steel Q450NQR1. Weathering steel electrodes of ordinary strength grades such as high-efficiency iron powder weathering steel electrodes, but it is a W-Cu alloy...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high tensile strength weather-resistant welding rod, which can solve the problem of matching manual welding rods for railways with weather-resistant steel Q450NQR1 with a yield strength of 450MPa