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Backing welding flux used for single-side submerged arc welding and the single-side submerged arc welding method using the same

A technology of submerged arc welding and backing welding, which is applied in the direction of arc welding equipment, welding equipment, welding equipment, etc., can solve problems such as difficulty in a little strain, difficulty in tightness of the back of the groove of the backing flux and the welded steel plate, etc., and achieve The effect of stable appearance and good tightness

Active Publication Date: 2009-10-28
KOBE STEEL LTD
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Problems solved by technology

[0012] However, the technology thus proposed ensures good adhesion between the pad flux and the groove back of the steel plate to be welded, which can be said to be the most important element in forming a shape, appearance, and sound back bead. On this point, there is still room for improvement
In addition, after spreading the backing flux to achieve the most densely packed particle size structure (JP-A-11-90680), since the voids in the backing flux become extremely small, the copper plate is moved to the air hose by filling the air hose with air. After the back of the groove of the steel plate to be welded is pressed, it is extremely difficult to follow the slight strain of the steel plate to be welded, and the tightness between the backing flux and the back of the groove of the steel plate to be welded is difficult

Method used

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  • Backing welding flux used for single-side submerged arc welding and the single-side submerged arc welding method using the same
  • Backing welding flux used for single-side submerged arc welding and the single-side submerged arc welding method using the same
  • Backing welding flux used for single-side submerged arc welding and the single-side submerged arc welding method using the same

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Embodiment Construction

[0023] Hereinafter, the present invention will be described.

[0024] In single-side submerged arc welding using copper plate and flux as a backing, in order to ensure good tightness between the backing flux and the back of the groove of the welded steel plate, it is important to In the post-strike state, minimize the gaps between the flux particles of the backing flux.

[0025] At this time, if the backing flux spread on the copper plate with a certain thickness is close to the state of solid flux with extremely small gaps in the flux, then fill the air hose with air and press the copper plate on the backing. When the groove back of the steel plate is welded, it hardly follows the strain or the like on the groove back of the steel plate to be welded, and the adhesion between the pad flux and the groove back becomes poor. Therefore, in the state where the pad flux is dispersed with a constant thickness on the copper plate, it is necessary to achieve a state in which a certain...

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Abstract

A backing welding flux used for single-side submerged arc welding method is used together with the copper board as a backing; is distributed on the copper board by a certain thickness, and is pressed, together with the copper board, on the nozzle back side of the steel plate to be welded to form a back side welding channel on the nozzle surface side while performing welding; wherein, the powder ratio is 3.0-10.0%. Using the backing welding flux can ensure the excellent tightness between the backing welding flux and the nozzle back side of the steel plate to be welded, and can obtain a welding channel with stable shape and appearance, and sound back side.

Description

technical field [0001] The present invention relates to mild steel, 490N / mm 2 High-grade high-tensile steel, etc. are used as the welding object, and the backing flux suitable for single-sided submerged arc welding is used with copper plate and flux as the backing, and the single-sided submerged arc welding method using it. Background technique [0002] The single-sided submerged arc welding method is an extremely efficient welding method that can process thick plates (for example, about 40mm thick) by performing one welding (one layer of welding) from the groove surface side without reversing the steel plate to be welded. Therefore, it is applied to the welding of various structures including butt welding of shipbuilding panels. [0003] However, in this single-sided submerged arc welding, the back bead is formed by welding the groove surface side of the steel plate to be welded. Therefore, if welding is performed with an inappropriate backing flux, welding defects such as...

Claims

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Application Information

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IPC IPC(8): B23K37/00B23K9/18
Inventor 幸村正晴西山繁树
Owner KOBE STEEL LTD
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