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Laser welding method for endless hot rolling and the apparatus therefor

A technology of laser welding and hot-rolled steel plates, applied in laser welding equipment, welding equipment, welding equipment, etc., can solve the problem of not being able to ensure stable quality welds

Active Publication Date: 2007-07-04
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these methods ensure consistent quality welds on high carbon steels containing at least 0.5% carbon
[0025] Although there are many techniques for joining steel plates in TCM mentioned above, these techniques can only be applied to high-carbon steels with lower carbon content, or production lines that do not require high welding quality

Method used

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  • Laser welding method for endless hot rolling and the apparatus therefor
  • Laser welding method for endless hot rolling and the apparatus therefor
  • Laser welding method for endless hot rolling and the apparatus therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0047] In this specification, "hot-rolled steel sheets prone to low-temperature transformation" mean hot-rolled steel sheets whose microstructure of the weld seam is in the Transformation occurs at low temperature. The low temperature transformed microstructure means a microstructure comprising martensite and bainite. The hot-rolled steel sheet prone to low-temperature transformation after laser welding also includes high-carbon steel or high-strength steel.

[0048] By high carbon steel is meant steel comprising at least 0.5% by weight of carbon. For example, the high carbon steel consists of at least 0.5% by weight carbon, 0.1-0.5% by weight silicon, 0.3-0.6% by weight manganese, up to 0.05% by weight phosphorus, up to 0.05% by weight Sulfur, up to 0.5% by weight copper, up to 3% by weight nickel, 0.05-0.5% by weight chromium, at least 0.05% by weight aluminum, the balance being iron and unavoidable impurities. In the present invention, unless otherwise stated, percentage...

Embodiment

[0100] These examples used hot-rolled steel sheets of high carbon steel having the compositions shown in Table 1. The thickness of the hot-rolled steel plate is 2.0 mm, using CO with a maximum output of 12 kW 2 The laser welding device welds it up. These examples used wire filler (0.9 mm) having the low carbon chemical composition shown in Table 1 as the welding material.

[0101] C

Si

mn

P

S

S-Al

Ni

Cr

N

hot rolled steel plate

SK85

0.8572

0.193

0.410

0.013

0.003

0.010

0.01

0.16

0.0049

S50C

0.5043

0.192

0.704

0.020

0.003

0.016

0.01

0.09

0.0026

Welding materials

ER70S-G

0.07

0.50

1.05

0.012

0.016

-

-

-

-

[0102] Under certain conditions, the laser welding device is used to laser weld these hot-rolled steel plates, so that th...

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Abstract

A laser welding method for hot rolled steel plate in the process of continuous producing coiled material. Two hot rolled steel plates which are easy to low temperature transforming are abutted. The abutting portion of the hot rolled steel plates are laser welded to form welded seam. The welded seams of the hot rolled steel plates are pressed by the pressing machine. The invention hardenings the microstructure of the welded seam to lesser degree, ensuring the welded seam with stable quality .

Description

[0001] priority statement [0002] This application claims priority from Korean Patent Application No. 2005-130248 filed in the Korean Intellectual Property Office on December 27, 2005, the contents of which are incorporated herein by reference. technical field [0003] The invention relates to a method for laser welding hot-rolled steel plates in a coil continuous production process. The method welds two hot-rolled steel plates together. More particularly, the present invention relates to a laser welding method that welds hot-rolled steel sheets together with a reduced degree of hardening of the microstructure of the seam to ensure stable welding quality. Background technique [0004] The invention relates to a method for laser welding hot-rolled steel plates in a coil continuous production process. The method welds two hot-rolled steel plates together. More specifically, the present invention relat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/32B23K26/42B23K26/26C22C38/60C22C38/42C22C38/20C22C38/18B23K35/30B23K35/02C21D9/50C21D11/00F16S1/00B23K101/16B23K26/21C21D1/42C22C19/05C22C38/00
CPCY02P10/25B23K26/0093B23K26/18B23K26/21B23K26/60B23K26/70
Inventor 禹仁秀朴浚植郑谱永金正吉李钟凤
Owner 浦项股份有限公司
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