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Welding torch for first electrode for multi-electrode submerged arc welding and welding method using same

A submerged arc welding, multi-electrode technology, applied in electrode clips without electrode shielding, arc welding equipment, welding medium, etc., can solve the problem of excessive welding input heat, aging resistance of power supply cables, and over-emphasis on welding efficiency, etc. problem, to achieve the effect of stabilizing the joint strength

Inactive Publication Date: 2019-08-02
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem in that welding efficiency and defect suppression (prevention of slag inclusion, etc.) Deteriorates the toughness of the weld, especially the heat affected zone (Heat Affected Zone: HAZ)
However, special insulating jigs and insulators are required, and there is a problem of poor workability when setting the electrode angle of multiple electrodes and replacing the power supply tip.
In addition, since the feeding point is located 50 mm to 100 mm above the tip of the feeding tip and close to the welded part, the aging resistance of the feeding cable may become a problem due to large radiant heat.

Method used

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  • Welding torch for first electrode for multi-electrode submerged arc welding and welding method using same
  • Welding torch for first electrode for multi-electrode submerged arc welding and welding method using same
  • Welding torch for first electrode for multi-electrode submerged arc welding and welding method using same

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Embodiment

[0049] Under the welding conditions shown in Table 1, for a pipe having an outer diameter of 34 inches and a thickness of 31.2 mm having a composition equivalent to API (American Petroleum Institute: American Petroleum Institute)-X65, the welding length by multi-electrode submerged arc welding is 10m surfacing test. All the first electrodes use powder-cored welding wires with a wire diameter of 2.4 mm. Here, a cored wire whose powder composition is 100% metal is used. The weight ratio of mild steel skin to filled powder is 3:1. As the welding wire for the second electrode, a wire containing C: 0.19mass%, Mo: 0.5mass%, and 0.1mass% Ti is used. solid wire. As the welding wire for the third electrode and the fourth electrode, use C: 0.05mass% and 0.2mass% Ti solid wire.

[0050] Table 1

[0051] Table 1 Welding conditions and welding results of surfacing tests based on submerged arc welding

[0052]

[0053] Ext: the distance between the base metal and the welding tip...

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Abstract

The present invention provides a welding technique for multi-electrode submerged arc welding that is stable even if a small-diameter wire is used with a first electrode, in particular if welding is being carried out under welding conditions where the wire feed speed increases or if there is considerable kinked winding, even after correction, with a flux cored wire. A welding torch for a first electrode for multi-electrode submerged arc welding and a method for multi-electrode submerged arc welding using the same are characterized by comprising a means for insulating, from an electrode wire, atubular electric conductor that is arranged between a power supply chip and a connecting part of a power supply cable.

Description

[0001] This application is a divisional application of an invention application with an application date of March 07, 2013, an application number of 201380011055.6, and an invention title of "Welding gun for first electrode for multi-electrode submerged arc welding and welding method using same". technical field [0002] The present invention relates to a first electrode torch for multiple-electrode submerged arc welding of thick steel plates suitable for applications such as seam welding of large-diameter steel pipes and Use its multi-electrode submerged arc welding method. Background technique [0003] Submerged arc welding has the following characteristics: the quality of the weld is excellent; the appearance of the weld bead is beautiful; and the most characteristic is that it can realize large heat input because the molten pool is protected by slag. under welding. Therefore, multi-electrode submerged arc welding with two or more electrodes is generally used for welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/28
CPCB23K9/122B23K9/186B23K9/188B23K9/282B23K9/123B23K9/26B23K35/0266B23K2101/04B23K2101/06
Inventor 横田智之早川直哉川井启治矢埜浩史
Owner JFE STEEL CORP
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