Nickel alloy welding wire for welding cast iron pipe

Abstract

The invention belongs to the technical field of welding, relates to a welding wire, discloses an alloy welding wire and particularly relates to a nickel alloy welding wire for welding a cast iron pipe. Chemical components of the welding wire comprise, by mass, 0%-0.30% of C, 0%-0.03% of Mn, 0%-0.60% of Si, 0%-0.020% of P, 0%-0.02% of S, 55.00%-85.00% of Ni and the balance iron. A method includes the steps of alloy smelting, electroslag remelting and the like. According to the mechanical properties of the welding wire, the yield strength is 300-600 Mpa, the tensile strength is 500-700 Mpa, the ductility is 10-40%, and impact strength is 56J. The mechanical properties of the welding wire are better than those of similar foreign products, and the welding wire can completely take the place of imported welding wires.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to a welding wire, more specifically an alloy welding wire, in particular to a nickel alloy welding wire for welding cast iron pipes and a preparation process thereof. Background technique [0002] The welding wire is the metal wire that melts and fills the joint of the welding workpiece during gas welding or electric welding. The material of the welding wire is usually the same as that of the workpiece. When the welding wire is welded, the welding core metal occupies a part of the entire weld metal, so the chemical composition of the welding core, directly affect the quality of the weld. [0003] As a special welding material, cast iron welding wire is indispensable in engineering fields such as casting welding and defect repair. Due to the high content of impurities such as sulfur and phosphorus in cast iron, low strength and poor plasticity, its inherent solidification characteris...

AI Technical Summary

Problems solved by technology

Due to the high content of impurities such as sulfur and phosphorus in cast iron, low strength and poor plasticity, its inherent solidification characteristics determine that during the welding repair process of cast iron, white spots or cracks are prone to occur in the welding repair area, especially under cold sweat conditions. The tendency of cracks is greater, which seriously affects the machining performance of castings

[0004] As far as welding wire is concerned, there are elements such as manganese and silicon in cast iron welding wire. The existence of manganese and silicon seriously affects the performance of welding wire. , discloses a solid core room temperature cast iron welding wire and a preparation method thereof, wherein Mn0.36-0.43%, Si0.01-0.03%, manganese, silicon and other elements are relatively high in content, although the performance of the previous products is improved, but It still cannot meet the requirements of cast iron welding performance, and there is a big gap with the performance of imported products