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

Abstract

The invention discloses a flux-cored alloyed 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-coredpowder comprises the components based on the weight percentage: 15-25% of graphite, 50-60% of 75 Si-Fe, 10-15% of Ni, 2.0-4.8% of Ti, 3.8-6.0% of Al, 0.8-2.5% of Bi, 0.1-0.3% of Ba, 0.5-1.8% Ce and 0.1-0.3% of RE, and the total weight percentage is 100%. The invention also discloses a flux-cored alloyed cast iron homogeneous electric welding rod, a flux-cored welding core of which consists of theH08A 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: 20-30% of marble, 10-16% of potassium feldspar, 5-12% of scale graphite, 6-10% of clay graphite, 15-25% of 75<#> silicoferrite, 3-7% of 30<#> calcium silicon alloy, 3-7% of aluminium powder, 3-7% of ferrous powder,10-15% of white slime, and 0.8-1.2% of sodium carbonate, and the total weight percentage is 100%.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored alloyed cast iron homogeneous gas welding wire, and also relates to a flux-cored alloyed cast iron homogeneous electric welding electrode. Background technique [0002] As special welding materials, cast iron welding wires and electrodes 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...

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 cast iron, such as commercially available Z208 and Z248 electrodes, and adopting a hot welding process are effective measures to overcome the above defects, but the warm-up process of hot welding is long, the process is complicated, the energy consumption is large, and the production cycle is long. Labor intensity is high, which undoubtedly increases the production cost of castings

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