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A self-shielded flux-cored wire suitable for pipeline steel welding

A technology of flux-cored welding wire and self-protection, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of poor low-temperature toughness, many pores and splashes, and large smoke and dust, and achieve high low-temperature impact toughness, Reduces spattering and even coverage

Inactive Publication Date: 2016-01-27
GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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Problems solved by technology

[0008] The purpose of the present invention is to provide a self-shielded welding flux-cored wire specially used for pipeline steel, which solves the problems of large smoke and dust, more pores and splashes, and poor low-temperature toughness during self-shield welding at present, and satisfies the outdoor construction of pipeline steel. Requirements for on-site self-protection and all-position welding adaptability

Method used

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  • A self-shielded flux-cored wire suitable for pipeline steel welding
  • A self-shielded flux-cored wire suitable for pipeline steel welding
  • A self-shielded flux-cored wire suitable for pipeline steel welding

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Embodiment Construction

[0016] According to the specific welding pipeline steel, the flux core powder is prepared according to the components in Table 1, and after drying at 120-300 °C, it is mixed evenly and added to the cold-rolled steel strip at a filling rate of 18-22%. In the welding wire for the outer skin.

[0017] Table 1 Flux cored wire components and mass percentage (%)

[0018]

[0019] The test materials are X60, X65, X70, and the size of the test plate is 300×150×20mm. According to the "Materials and Welding Specifications" of China Classification Society, the Y-shaped groove is processed, and the multi-layer and multi-pass welding method is adopted. After the front side is surfacing and the back is cleaned, there is one welding, and the non-pulse constant voltage power supply is used for DC positive connection. The V-notch impact specimens of welded joints were prepared according to the "Code for Materials and Welding" of China Classification Society. The size of the impact sample ...

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Abstract

A self-shielding flux-cored welding wire suitable for pipeline steel welding, consisting of a steel strip and flux-core powder, characterized in that the chemical composition and mass percentage of the powder are: 20-26% slagging agent, 10% aluminum oxalate gas-forming agent ~15%, Ge0.4~0.8%, Mn1.2~2.4%, Si0.4~0.8%, Ti0.2~0.4%, Al0.1~0.5%, Ni? 1.0~2.4%, albite 1.0~1.5%, the rest is iron powder, the powder filling rate is 18~22%. The invention provides a flux-cored welding wire for self-protection welding specially used for pipeline steel, which does not generate a large amount of smoke and harmful gas during the welding process, reduces splashing during the welding process, keeps the arc stable and has no obvious pores on the surface, and reduces the risk of melting. The content of nitrogen and oxygen in the pool ensures that the weld metal structure is refined and evenly distributed, and the low-temperature impact toughness is high. The invention is suitable for welding high-strength steel with a certain strength, and can especially meet the field operation requirements of outdoor large-diameter pipeline steel.

Description

technical field [0001] The invention relates to a self-protection flux-cored welding wire used in arc welding, and is especially suitable for all-position self-protection welding flux-cored welding wire of pipeline steel (X60, X65, X70 grade pipeline steel). Background technique [0002] Compared with the currently widely used gas-shielded arc welding, self-shielded flux-cored arc welding does not require additional gas for protection, and only relies on the slag-forming and gas-forming substances in its own flux core components during the welding process to protect the weld metal. Protection, and achieve the performance index required by the actual working conditions by transitioning to the metal with specific properties to the weld metal. The operation method is simple, the wind resistance is strong, and the comprehensive cost is low. It is a new type of welding material with high efficiency, safety and environmental protection. Self-shielding flux cored wire products hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/368
CPCB23K35/0266B23K35/3053B23K35/3601B23K35/3607B23K35/368
Inventor 易江龙郑世达王凯陈和兴王昕昕郭春富马凯夫
Owner GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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