Method of laser welding for steel sheet and laser welding apparatus

A laser welding and steel plate technology, which is applied in laser welding equipment, welding/welding/cutting articles, welding equipment, etc., can solve problems such as scale powder residue and steel plate surface defects, so as to reduce poor shape, reduce welding cracks, and improve productivity effect

Active Publication Date: 2012-08-01
NIPPON STEEL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] On the other hand, in the case of using laser welding without washing with water, scale powder, etc. may remain on the steel sheet, which may cause defects, etc., on the surface of the steel sheet in post-processing

Method used

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  • Method of laser welding for steel sheet and laser welding apparatus
  • Method of laser welding for steel sheet and laser welding apparatus
  • Method of laser welding for steel sheet and laser welding apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0051] figure 1 It is a perspective view of the laser welding apparatus of 1st Embodiment of this invention.

[0052] Such as figure 1 As shown, the laser welding device 1 of the first embodiment includes: a jig 2 for holding a plate-shaped workpiece to be welded; figure 1 The welding carriage 3 that moves in the Y direction while welding the welded piece that is conveyed in the X direction; the carbon dioxide laser oscillator 4 .

[0053] figure 2 It is a sectional view which shows the cross section of the welding carriage 3 of the laser welding apparatus 1 of 1st Embodiment.

[0054] Such as figure 2 As shown, the welding carriage 3 includes: guillotine shears 5a, 5b, which are used as parts for cutting off the two ends of the transported workpiece to be welded; A part for shaping by pressing the butt part of the workpiece held by the jig 2; an induction heating head 7 for preheating, which is used as the first heater for inductively heating the workpiece after shapin...

no. 2 Embodiment approach

[0090] In the laser welding device 1 according to the first embodiment, a processing head 9 is provided for welding the workpieces 100a, 100b heated by the induction heating head 7 for preheating by irradiating laser light on the workpieces 100a, 100b to be welded.

[0091] In the laser welding apparatus 1a of the second embodiment, instead of the processing head 9, a processing head 9a having a function of injecting filler wire is provided.

[0092] The filler wire referred to here is a metallic welding material, and is often used especially when the workpieces 100a and 100b to be welded are difficult-to-weld materials such as high-carbon steel and high-Si steel. In the case of performing laser welding while injecting the filler wire into the welded portion by the processing head 9a, there is an effect of diluting the weld metal, and the welding quality can be improved. In addition, when the guillotine shearing machine 5 ages and the mechanical accuracy decreases, and the sha...

no. 3 Embodiment approach

[0099] Figure 12 It is a perspective view of the laser welding apparatus of 3rd Embodiment.

[0100] In the laser welding apparatus 1 according to the first embodiment, a carbon dioxide laser oscillator 4 and a machining head 9 for irradiating the laser beam transmitted through the air from the carbon dioxide laser oscillator 4 to the butted portions of the workpieces 100a and 100b to be welded are provided.

[0101] In the laser welding device 1b of the third embodiment, instead of the carbon dioxide laser oscillator 4, a YAG-based laser oscillator, or an oscillator 4b such as a fiber laser oscillator or a disk laser oscillator in which a plurality of fibrous crystals are arranged in parallel, is provided. A processing head 9b for irradiating the laser beam emitted from the oscillator 4b and guided by the optical fiber 12 to the butt portion of the workpieces 100a and 100b to be welded is provided.

[0102] In addition, the so-called fiber-shaped laser oscillator is a well-...

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Abstract

A method of laser welding for a steel sheet, in which there can be attained reduction of morphological defects of the weld area of welded material and exhibition of satisfactory bonding strength; and a laser welding apparatus therefor. There is provided a method of laser welding for a steel sheet through causing multiple steel sheets to abut on each other at end faces thereof and irradiating the abutted area of the steel sheets brought into mutual abuttal with laser beams to thereby weld the abutted area, comprising the cutting step of cutting end faces of steel sheets into forms suitable for mutual abuttal; the abutting step of bringing the end faces formed by the cutting step into mutual abuttal; the first heating step of heating the abutted area; and the laser welding step of welding by laser the abutted area having been heated by the first heating step.

Description

[0001] This application is a divisional application of an invention application with a filing date of February 14, 2008, a Chinese application number of 200880004583.8, an international application number of PCT / JP2008 / 052400, and an invention title of "Laser welding method and laser welding device for steel plates" technical field [0002] The present invention relates to a laser welding method and a laser welding device for butt joint parts of steel plates. Background technique [0003] Generally, in process lines (lines for pickling, annealing, rolling, rewinding, inspection, etc.) that process steel sheets such as hot-rolled steel sheets and cold-rolled steel sheets, continuous supply of steel sheets, A continuous line for continuous processing of supplied steel plates. [0004] In order to continuously supply the steel sheets to be processed to such a continuous line capable of continuous processing, it is necessary to butt weld the steel plates to the steel plates in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/42B21B15/00B23K26/21
CPCB23K2203/04B23K26/26B23K26/0093B23K2103/04B23K26/32B23K26/60B23K2101/16
Inventor 小出太郎巽雄二郎大野谷耕一杉坂昭彦冈田敦司中野裕行井上秋雄中川佳昭
Owner NIPPON STEEL CORP
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