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Self-protection flux-cored wire applicable for pipeline steel welding

A flux-cored wire, self-protection technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of many pores and spatter, large smoke, poor low temperature toughness, etc., to reduce spatter phenomenon, cover Uniform, high temperature impact toughness effect

Inactive Publication Date: 2014-09-17
GUANGDONG PROVINCIAL INST OF WELDING TECH GUANGDONG PROVINCIAL ACADEMY OF UKRAINE
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Self-protection flux-cored wire applicable for pipeline steel welding
  • Self-protection flux-cored wire applicable for pipeline steel welding
  • Self-protection flux-cored wire applicable for pipeline steel welding

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Embodiment Construction

[0015] 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.

[0016] Table 1 Flux cored wire components and mass percentage (%)

[0017]

[0018] 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 s...

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Abstract

The invention discloses a self-protection flux-cored wire applicable for pipeline steel welding. The self-protection flux-cored wire consists of a steel band and flux core powder, and is characterized in that the flux core powder comprises the following chemical components in mass percentage: 20-26% of slagging constituent, 10-15% of gas forming agent aluminum oxalate, 0.4-0.8% of Ge, 1.2-2.4% of Mn, 0.4-0.8% of Si, 0.2-0.4% of Ti, 0.1-0.5% of Al, 1.0-2.4% of Ni, 1.0-1.5% of soda feldspar, and the balance of iron powder; the flux core filling rate is 18-22%. The invention provides the self-protection flux-cored wire specially aiming at pipeline steel, a lot of smoke and harmful gas cannot be produced in the welding process, the spatter phenomenon is reduced in the welding process, the arcs are maintained to be stable, no obvious pore is formed in the surface, the contents of nitrogen and oxygen in a molten bath are reduced, the weld metal structure refinement and the uniform distribution are ensured, and the low temperature impact toughness is high. The self-protection flux-cored wire is applicable for the welding of high-strength steel with certain intensity, and the field operation requirements of outdoor large-pipe diameter pipeline steel can be particularly met.

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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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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