A heat-crack-resistant seamless flux-cored welding wire under large restraint conditions

Abstract

The invention relates to a heat-resistant crack-resistant seamless flux-cored welding wire under large restraint conditions, which belongs to the field of welding materials, and includes a welding wire sheath and a flux core powder; the weld wire sheath adopts a low-carbon steel strip; according to mass percentage, the flux core powder includes rutile 30 %‑40%, quartz 2%‑4%, alumina 1%‑2%, aluminum-magnesium alloy 1%‑2%, magnesium powder 2%‑4%, low carbon ferromanganese 4%‑6%, metal manganese 5 %‑9%, zircon sand 1%‑2% and sodium fluoride 1%‑2%, the balance is iron powder. With a reasonable formula and composition design, it can be welded with a ceramic liner under the working conditions of large constraints. There is no thermal crack in the weld bead after welding. At the same time, the welding process is good, and all-position welding can be realized.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and further relates to a seamless flux-cored welding wire. Background technique [0002] In recent years, the structural adjustment and product upgrading process of welding material products will be significantly accelerated. Among them, since the flux-cored welding wire can realize continuous automatic welding, the automation and high-efficiency development of welding technology has been promoted. Flux-cored welding wire is also widely used in industries such as pipelines, ocean engineering, power station construction, mining, petrochemical, construction machinery, heavy machinery and high-rise buildings. At present, the shipbuilding industry has generally adopted CO 2 Gas-shielded flux-cored wire is used to weld ship structures, and the utilization rate reaches more than 80%. [0003] In the shipbuilding industry, under the conditions of large constraints such as segmented constructi...

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Problems solved by technology

[0003] In the shipbuilding industry, under the conditions of large constraints such as segmented construction, hull closing, inner bottom plate, and deck splicing welds, the use of flux-cored wires with ceramic liners for backing welding can improve work efficiency, but the front side of the weld bead Welding hot cracks often occur, which are specifically manifested as longitudinal cracks of different lengths and depths in the center of the front of the weld. Among them, the short and shallow longitudinal cracks will be eliminated by penetration after multi-pass welding in most cases, but Long and deep cracks sometimes have incomplete penetration, which poses a great safety hazard and seriously affects production efficiency and structural safety.

[0004] Chinese Patent Publication No. CN201610955632.2 and CN201810385371.4 propose a heat-crack-resistant welding wire respectively, but they are all stainless steel flux-cored welding wires. Chinese Patent Publication No. CN201910179963.5 proposes a high-crack-resistant flux-cored welding wire, but Its application is only for routine occasions, and the application under large restraint conditions is not specified, and the structure of this welding wire is seam welding wire

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