High-strength high ductility gas protecting welding stick

Abstract

The invention relates to a gas shielded welding wire with high strength and high toughness, which solves the defects that the existing strength grade in the technical field is unsuitable for market demand and is of high cost. The technical scheme of the invention is that the components of the welding wire (according to the weight percentage) are as follows: 0.04 to 0.10 of C, 0.30 to 0.80 of Si, 1.30 to 2.0 of Mn, 0.40 to 0.89 of Ni, 0.20 to 0.50 of Cr, 0.20 to 0.60 of Mo, 0.56 to 0.80 of Cu, 0.05 to 0.20 of Ti, 0.002 to 0.010 of B, less than 0.020 of P, less than 0.015 of S, less than 0.03 of Als and the rest of Fe and inevitable impurities. The welding wire of the invention has stable quality. The mechanical property of a deposited metal is that Rel is equal to 810MPa; Rm is equal to 840MPa; A is equal to 16 percent and Z is equal to 66 percent. The average impact power AKV in minus 20 DEG C is 141J; and the average impact power AKV in minus 40 DEG C is 128J; and the average impact power AKV in minus 60 DEG C is 70J. The welding wire is suitable for gas shielded welding of 800MPa grade of ultra-fine steel; as the content of Ni is reduced, the cost of the welding wire is reduced dramatically and the implementation is easy.

Description

technical field [0001] The invention relates to a high-strength and high-toughness gas shielded welding wire, which is 80% Ar+20% CO 2 Welding under the protection of mixed gas, the tensile strength of the weld metal is ≥800MPa, and the impact toughness at -40°C is A KV ≥47J, a gas-shielded welding wire with a wide adaptability to welding line energy. Background technique [0002] With the development of science and technology, the design of welded structures tends to be high-parameter, lightweight and large-scale. Due to its excellent performance and significant economic benefits, low-alloy high-strength steel has been more and more widely used in welded structures. This kind of steel has high strength and good toughness, which creates conditions for saving steel and reducing the weight of welded structures. For vehicles, ships, construction machinery and other operating structures, the use of low-alloy high-strength steel with good weldability can promote the developmen...

AI Technical Summary

Problems solved by technology

[0003] At present, there are limited varieties of gas-shielded welding wires that match low-alloy high-strength steels in the domestic market. Through the search of domestic and foreign literature and patents from 1984 to the present, domestic high-strength gas-shielded welding wire patents are mostly 500-700MPa strength levels, such as Harbin Welding Research The so-called 600MPa grade HS-60, Wuhan Iron and Steel 700MPa grade weather-resistant gas-shielded welding wire, etc., the welding wire with a strength of more than 800MPa has a high alloy content, such as the Chinese patent number 200510019059.6 "Gas-shielded welding wire for welding high-strength steel", Chinese Patent Publication No. It is the patent of CN1413795, and foreign similar gas-shielded welding wire products such as MGS-88A welding wire of Kobe Steel in Japan, YM-80C and YM-80A welding wire of Nippon Steel and LA-100 welding wire of Lincoln in the United States, etc., are all obtained by adding a high amount of Ni, combined with an appropriate amount of Cr, and then added an appropriate amount of Mo or Re elements to achieve solid solution strengthening of the weld metal. Due to the addition of a large amount of expensive Ni elements, the production cost is high, which cannot meet the domestic market demand for high-strength gas. High demand for shielded welding wire