Submerged arc welding method for steel sheets

A technology of submerged arc welding and steel plate, which is applied in the direction of arc welding equipment, welding equipment, welding/welding/cutting items, etc. It can solve the problems of increased device load, increased risk, and complicated device structure, and achieves a large welding bead width Effect

Active Publication Date: 2014-07-30
JFE STEEL CORP
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Problems solved by technology

[0004] On the other hand, in the seam welding of large-diameter steel pipes, there are problems such as deterioration of the toughness of the welded part, especially the heat-affected zone. In order to improve the toughness of the welded part, it is necessary to reduce the welding heat input as much as possible.
However, if the welding heat input is reduced, there is a problem that the risk of insufficient penetration increases, unmelted parts are likely to occur, and surface defects such as undercuts are likely to occur
[0009] However, in the technology disclosed in Patent Document 4, although the effect of increasing the width of the bead is obtained, it is necessary to introduce a device for applying a magnetic field, so the structure of the device becomes complicated. Increased load required for maintenance

Method used

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  • Submerged arc welding method for steel sheets
  • Submerged arc welding method for steel sheets
  • Submerged arc welding method for steel sheets

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Embodiment

[0049] Such as Figure 4 As shown, the groove angle θ is 60°, 70°, 80°, and the groove depth D is 8mm, 10mm, 17mm on the steel plate 5 with a thickness T of 18.0mm, 25.4mm, and 38.1mm. After that, use 4 electrodes for submerged arc welding to make Figure 5 Solder joints shown. Table 1 shows the groove shape, Table 2 shows the welding conditions, Table 3 shows the arrangement of the electrodes, and Table 4 shows the setting of the welding current.

[0050] [Table 1]

[0051]

[0052] [Table 2]

[0053]

[0054] #1 to #4 represent the first electrode to the fourth electrode, respectively.

[0055] [table 3]

[0056]

[0057] #1~#4 represent the first electrode to the fourth electrode respectively

[0058] The distance between poles indicates the distance along the welding line

[0059] The electrode angle is indicated by a positive value for the advance angle. A negative number is used for the sweep angle

[0060] The distance from the welding line uses a posit...

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Abstract

Provided is a submerged arc welding method enables welds with high toughness to be provided with low input heat, deep penetration, and a wide bead width to be sufficiently obtained in the welding of thick materials such that the welding speed is not more than 3 m / minute. The wire diameter of a first electrode at the head in the welding direction is established at 3.9 to 4.1 mm. Two electrodes are positioned on both sides of a weld line at the tail end in the welding direction. Wire tip positions of the two electrodes on the surface of a steel sheet are positioned on the same line, which is perpendicular to the weld line, and the distance (W) (mm) between the wire tip positions and the weld line is established at 5 to 20 mm.

Description

technical field [0001] The invention relates to submerged arc welding of steel plates, in particular to submerged arc welding suitable for seam welding of large-diameter steel pipes such as UOE steel pipes and spiral steel pipes. Background technique [0002] Submerged arc welding (for example, refer to Patent Documents 1 and 2) using two or more electrodes for seam welding of large-diameter steel pipes such as UOE steel pipes and spiral steel pipes has become popular, and is widely used from the viewpoint of improving the productivity of large-diameter steel pipes. It is an efficient double-sided single-layer surfacing welding with one bead on the inner surface side and one bead on the outer surface side. [0003] In double-sided single-layer surfacing welding, it is necessary to ensure the depth of penetration so that the weld metal on the inner surface side and the weld metal on the outer surface side are fully fused without producing unmelted parts. Therefore, a large cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18
CPCB23K9/188B23K33/006B23K2101/06B23K2103/04B23K9/23
Inventor 石神笃史早川直哉矢埜浩史
Owner JFE STEEL CORP
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