Electrode coating, electrode with low crack sensitivity and preparation and application thereof

Abstract

The invention belongs to the technical field of welding materials, and specifically relates to an electrode coating, an electrode with low crack sensitivity and preparation and application thereof. The electrode coating comprises the following components in percentage by mass: 8-12% of marble, 3-5% of dolomite, 32-38% of rutile, 6-8% of dehydrated potassium feldspar, 3-5% of dehydrated mica, 2-4%of fluorite, 1-2% of potassium fluoroaluminate, 11-13% of chrome, 2-4% of ferrotitanium, 1-2% of rare earth ferrosilicon, 4-6% of manganese, 2-4% of zircon sand, 1-3% of rare earth fluoride, 2-4% of wollastonite, 1-2% of sodium carbonate, 1-2% of CMC, 1-2% of potassium titanate, 0.5-1% of bismuth oxide, and 0.5-1% of iron oxide red. The invention also provides the electrode with low crack sensitivity. The electrode is small in welding splashing, high in spreading and fusion performance, stable in electric arc, easy to deslag, nice in formed shape, low in crack sensitivity, and outstanding in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a welding rod coating, a welding rod with low crack sensitivity and its preparation and application. Background technique [0002] E316L electrode (nominal composition 18.5%Cr, 12Ni%, 2.5Mo%) is mainly used in the welding of structural parts and surfacing of corrosion-resistant layers in papermaking, petrochemical, coal chemical and other fields. At present, the main technical problems of this electrode are: the solidification structure of this electrode is mainly austenite, and the sensitivity to hot cracks is relatively high. During the welding process, only low interpass temperature and small heat input can be used for welding, which greatly reduces the Restricted the construction progress of the project. The electrode can only be welded with a lower interpass temperature and a smaller heat input. The main reasons are as follows: (1) Due to the use of H0...

AI Technical Summary

Problems solved by technology

At present, the main technical problems of this electrode are: the solidification structure of this electrode is mainly austenite, and the sensitivity to hot cracks is relatively high. During the welding process, only low interpass temperature and small heat input can be used for welding, which greatly reduces the Restricted the progress of construction

The electrode can only be welded with a lower interpass temperature and a smaller heat input. The main reasons are as follows: (1) Due to the use of H03Cr19Ni12Mo2 alloy steel welding core, the resistance is large. When the welding core reddens seriously, it leads to increased spatter, unstable arc, and even the coating is cracked and cannot be welded; The interval is large, and the low melting point phase is easy to form a low melting point liquid film at the boundary of the primary crystal grains in the late stage of crystallization, and shrinks to form microcracks during cooling, and the microcracks expand to the weld surface during cooling to form macrocracks

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