80 kilogram grade low welding crack sensibility high-strength steel plate special-purpose welding wire

Abstract

The invention belongs to the welding wire technical field, and discloses a special welding wire for 80 Kg level steel plate with low welding crack sensibility and high strength. The invention has the technical proposal that the welding wire includes the elements in the following weight percentage: 0.06 to 0.12 percent of carbon, 0.40 to 1.00 percent of silicon, 1.40 to 2.10 percent of manganese, 0.02 to 0.20 percent of titanium, 0.001 to 0.01 percent of boron, 0.05 to 1.50 percent of nickel, 0.05 to 1.20 percent of chromium, niobium b lower than or equal to 0.10 percent, vanadium lower than or equal to 0.10 percent, sulfur lower than or equal to 0.10 percent, phosphorus lower than or equal to 0.10 percent, the rest comprises iron and other unavoidable foreign matters. Through the experiment, the ambient temperature of the welding joint for welding crack sensibility and high strength steel plate is subzero 20 DEG C to 50 DEG C by utilizing the welding wire without preheat, and the occurrence of cold cracks can be prevented.

Description

technical field [0001] The invention belongs to the technical field of welding wires, and in particular relates to a special welding wire for high-strength steel plates with low welding crack sensitivity of 80 kilograms. Background technique [0002] High-strength steel plate with low welding crack sensitivity is a steel plate that can weld without cracks without preheating or low preheating. The main characteristics of this type of steel plate are low Pcm value, low carbon equivalent, excellent welding It has the characteristics of low C content, high purity, high strength and high toughness. Because this kind of steel is a new type of steel, there is no special welding wire specially used for this steel welding so far, and there is no special welding wire used for welding at lower temperatures. When welding this type of steel, ordinary high-strength welding wire is often used as a substitute. In order to improve the weld strength, high-strength welding wire (such as ER76...

AI Technical Summary

Problems solved by technology

The high-strength steel plate with low welding crack sensitivity welded by this substitute welding wire, because the content of alloy elements in the weld is too high, resulting in too high Pcm value and low carbon equivalent, it cannot be welded without preheating or low preheating. The steel plate does not reflect its unique excellent performance, and thus greatly increases the production cost of the welding wire

At present, there is no special welding wire specially used for welding high-strength steel with low welding crack sensitivity in the environment between minus 20°C and minus 50°C, which is economical and has good welding performance.