Composite mixed submerged-arc welding flux and welding method thereof

Abstract

The invention discloses a composite mixed submerged-arc welding flux and a welding method thereof. The composite mixed submerged-arc welding flux comprises a sintering flux HJ431 and a smelting flux SJ101, and the weight ratio of the sintering flux HJ431 to the smelting flux SJ101 is (5.5-8):1. By mixing the sintering flux HJ431 and the smelting flux SJ101 for combination and using an H10Mn2 welding wire in cooperation for a specific welding object, namely Q390BGJ-Z15 steel, the composite mixed submerged-arc welding flux is suitable for submerged-arc welding of ship-shaped parts, cross parts, butt joint parts and other joint parts of factory components, a welding seam obtained finally has good formability, slag detachability and mechanical properties, the welding seam is attractive, the impact toughness of deposited metal is improved, and the welding process performance is improved; and the energy consumption is low, the price of the welding flux is relatively lower, the production cost is effectively reduced, and harmful gases generated during welding are reduced.

Description

technical field [0001] The invention belongs to the technical field of submerged arc welding flux, in particular to a compound mixed submerged arc welding flux. Background technique [0002] Submerged arc welding was produced in 1935. Due to its large penetration depth, high productivity and reliable mechanization, submerged arc welding is suitable for through welds of medium and thick plate structures. Therefore, submerged arc welding is widely used in shipbuilding, pressure vessel industry, bridges, railway vehicles, construction machinery, pipelines, nuclear power plant structures, marine structures and architectural steel structures, and is also the most commonly used fusion welding in welding production today. One of the methods. [0003] At present, there are many double (multiple) wire submerged arc welding methods in the submerged arc welding technology, but different types of steel materials need to use different fluxes and welding wires to achieve better welding q...

AI Technical Summary

Problems solved by technology

At present, most of them use H08MnA (welding wire) + HJ431 (flux) or H08MnA (welding wire) + SJ101 (flux) as the solder for submerged arc welding. However, these two conventional methods cannot meet the requirements when welding Q390BGJ-Z15 steel. The mechanical performance requirements in the design, or the cost is too high;

[0005] In the prior art, for example, in the document "Analysis of the Influence of the Mixed Use of Flux HJ431 and SJ101 on Slag Removal" (Han Eryang, Construction Technology, Volume 45, December 2016, 472-474), it is disclosed that the commonly used flux HJ431, SJ101 Reasonable mixing ratio of slag removal performance when mixed use, the welding wire used is H08MnA, but the welding object mainly studied in this document is Q345B steel, and the obtained flux HJ431 and SJ101 are mixed in a ratio of 3:1 and need to be matched with large groove welding , the main research is how to solve the problem of weld slag inclusion in multi-layer multi-pass submerged arc welding of thick plate welds, and how to improve the performance of slag deslagging, but simply mention that the welding shape is better

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