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Melt flux for submerged-arc welding

A technology of fusion welding and submerged arc welding, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve difficult problems such as performance, and achieve the effects of improving welding workability, improving low temperature toughness, and reducing oxygen content

Active Publication Date: 2005-04-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In addition, the flux described in Japanese Patent Publication No. 5-38677 is a flux for the two-electrode welding method. Recently, the welding speed has been further increased in order to improve welding efficiency, and it is difficult to say that it has sufficient performance

Method used

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  • Melt flux for submerged-arc welding
  • Melt flux for submerged-arc welding
  • Melt flux for submerged-arc welding

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Embodiment

[0065] Hereinafter, the effects of the examples of the present invention will be described in comparison with comparative examples outside the scope of the present invention.

[0066] image 3 (a) is a schematic diagram showing the electrode arrangement of four-electrode welding, and (b) is a cross-sectional view showing the groove shape at this time. in addition, Figure 4 (a) is a schematic diagram showing the electrode arrangement of 3-electrode welding, and (b) is a cross-sectional view showing the groove shape at this time. First, a test steel plate having a composition (JIS standard G3160 SM490A) shown in Table 1 below and a thickness of 20 mm was used with a welding wire (JIS Z3351 YS-S6, diameter 4.0 mm) having a composition shown in Table 2 below and the following: For fluxes with the composition shown in Table 3.1 and Table 3.2, in the above Table 4, image 3 (a), (b) and Figure 4 Under the conditions shown in (a) and (b), the double-sided single-layer welding o...

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Abstract

The fusible flux contains, in the total mass of the flux, 15-21 mass% CaO, 11-19 mass% CaF2, 7-14 mass% MgO, 28-35 mass% SiO2, 9-17 mass% Al2O3, 6-12 mass% MnO, 0.2-1.5 mass% FeO, 0.5-1.8 mass% in total of Na2O and K2O, and <=1.0 mass% B2O3, with TiO2prescribed at <=4 mass%. Also, a value [M] provided in the formula below is set at 1.00-1.50 in the fusible flux. To provide fusible flux for submerged arc welding, fusible flux that has superb low temperature toughness of weld metal and superior welding workability in two side / one layer high-speed welding.

Description

technical field [0001] The invention relates to a molten flux for submerged arc welding used in high-speed submerged arc welding suitable for welding large-diameter steel pipes such as pipelines and structural pipes. Background technique [0002] In the welding of steel pipes used to transport natural gas and oil pipelines, in order to improve the efficiency of pipe production, the welding speed has been further increased, and the following problems have occurred due to the increase in the incidence of welding defects such as undercuts and slag inclusions. The toughness of the weld metal is deteriorated due to the increase of the oxygen content of the weld metal. In the past, when seam welding such a large-diameter steel pipe was performed, double-sided single-layer welding by the multi-electrode submerged arc welding method capable of high-speed welding was applied. However, this double-sided single-layer welding by the multi-electrode submerged arc welding method Single-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K9/18
Inventor 石崎圭人西山繁树
Owner KOBE STEEL LTD
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