80 kilogram-scale low welding crack sensibility high-strength steel plate special-purpose welding stick

Abstract

The invention belongs to a technical field of welding wire and discloses a special welding wire for 80kg grade of low welding crack-sensitive high-strength steel plates. The technical scheme is that the welding wire comprises the elements with the following weight percentages: 0.06 to 0.12 of carbon, 0.40 to 1.00 of silicon, 1.40 to 2.10 of manganese, 0.02 to 0.20 of titanium, 0.001 to 0.01 of boron, 0.05 to 1.50 of nickel, less than 1.20 of chromium, less than 0.10 of niobium, less than 0.10 of vanadium, less than 0.10 of sulfur, less than 0.10 of phosphorus and the rest of iron and inevitable impurities. According to the experience, when the welding wire is not preheated and the working environment temperature of the welded joint of the welding crack-sensitive high-strength steel plates is between minus 20 DEG C and minus 50 DEG C, cold crack on the welding seam can be avoided.

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 cannot be welded without cracks under the condition of no preheating or low preheating. The main characteristics of this type of steel plate are low P cm value, low carbon equivalent, excellent Weldability, also 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...

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 P cm value and low carbon equivalent, it cannot be welded without preheating or low preheating , so that the steel plate does not reflect its unique excellent performance, and thus greatly increases the production cost of 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.