Flux-cored alloyed ductile cast iron homogeneous gas-welding wire and electric welding rod

Abstract

The invention discloses a flux-cored alloyed ductile cast iron homogeneous gas-welding wire which consists of H08A steel strip and alloyed flux-cored powder cladded in the H08A steel strip, and the flux-cored powder comprises the components based on the weight percentage: 10-20% of graphite, 50-60% of 75 Si-Fe, 5-8% of Ni, 2-5% of Ti, 3.8-6% of Mg, 0.8-2.5% of Bi, 1-2.5% of Zr, 2.0-4.5% of Ba, 1.5-2.8% of Ce and 4-6% of RE, and the total weight percentage is 100%. The invention also discloses an electric welding rod, a flux-cored welding core of which consists of the H08A steel strip and the alloyed flux-cored powder cladded in the H08A steel strip, and the coating applied on the welding rod comprises the components based on the weight percentage: 5-11% of marble, 10-20% of dolomite, 5-15% of potassium feldspar, 5-15% of fluorite, 8-16% of graphite, 15-25% of 75 silicoferrite, 6-10% of 30 calcium silicon alloy, 4-6% of aluminium powder, 3-7% of ferrous powder, 5-15% of white slime, 0.5-1.5% of NaCO3, 1-3% of RE-Y, and the total weight percentage is 100%. The gas-welding wire or the electric welding rod can realize normal temperature gas welding, cold welding or low temperature preheating welding.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a homogeneous gas welding wire of flux-cored alloyed ductile iron, and also relates to a homogeneous electrode of flux-cored alloyed ductile iron. Background technique [0002] As special welding materials, cast iron electrodes and wires are indispensable in engineering fields such as casting iron 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 characteristics determine that during the welding repair process of cast iron, white spots and cracks are prone to occur in the welding repair area, especially under cold welding conditions. And the crack tendency is greater, which seriously affects the machining performance and service performance of castings. [0003] Use cast iron electrodes coated with graphitized coating on non-cast iron co...

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 and cracks are prone to occur in the welding repair area, especially under cold welding conditions. And the crack tendency is greater, which seriously affects the machining performance and service performance of castings

[0003] Use cast iron electrodes coated with graphitized coating on non-cast iron cores for cast iron welding, such as Z208 (low carbon steel core) electrodes, Z308 (pure nickel core) electrodes, Z408 (nickel iron core) electrodes, etc., although to a certain extent Reduce white spots and cracks, but because the composition, structure, performance and color of the weld do not match the casting, the crack resistance is poor, and it cannot meet the comprehensive performance requirements of repairs such as color consistency and performance matching.

[0004] Applying welding materials of the same quality as ductile iron, such as commercially available Z238 and Z258 electrodes, and adopting a hot welding process are effective measures to overcome the above defects, but the preheating method of hot welding is complicated, energy consumption is large, the production cycle is long, and labor intensity Large, undoubtedly increases the production cost of castings

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