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Welding method of high carbon steel for endless hot rolling

A technology of laser welding and process, applied in the direction of laser welding equipment, welding medium, welding equipment, etc., can solve the problem of not being able to ensure stable quality welds

Inactive Publication Date: 2007-07-04
POHANG IRON & STEEL CO LTD
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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
[0023] 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 for production lines that do not require high welding quality

Method used

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  • Welding method of high carbon steel for endless hot rolling
  • Welding method of high carbon steel for endless hot rolling
  • Welding method of high carbon steel for endless hot rolling

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0040]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.

[0041] 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, percentages...

Embodiment

[0083] These examples employed high-carbon steel hot-rolled steel sheets (mainly composed of iron) having the compositions shown in Table 1. These hot-rolled steel plates have a thickness of 2.0 mm and pass through a CO with a maximum output of 12KW 2 Laser welding devices are welded to each other.

[0084] C

Si

mn

P

S

S-Al

Ni

Cr

N

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

[0085] These examples also use filiform filler (Φ0.9 mm) as the welding material. Welding consumables with compositions shown in Table 2 include ER70S-G and ER80S-G based on carbon steel, ER308 based on stainless steel, and ERNiCrMoO based on nickel alloy 3 and ERNi. The carbon steel-based ER70S-G and ER80S-G have iron as the main chemical compositio...

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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 by welding materials containing at most 1% by weight of carbon and 0-1.22 by weight of chrome. The laser welding method for welding the hot rolled steel plates in the process of continuous producing ensures less hardening for welded seam of the abutting portion on the microstructure, thereby ensuring stable welding quality.

Description

[0001] Related Application Cross Reference [0002] This application claims priority from Korean Patent Application No. 2005-130102 filed in the Korean Intellectual Property Office on December 26, 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 specifically, the present invention relates to a method for laser welding of hot-rolled steel sheets in a continuous production process for coils, which ensures that steel welds that undergo low-temperature deformation are less likely to occur during the laser welding process including sudden heating and sudden cooling. Minor hardening to ensure consistent weld quality. Background technique [0004] The technical field of producing sheet metal is in great need of continuous production processes ca...

Claims

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Application Information

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IPC IPC(8): B23K26/32B23K35/30B23K35/02B23K26/42C21D9/50C21D11/00C22C38/60C22C38/42C22C38/20C22C38/18B23K26/21C21D9/46C22C38/00
CPCB23K26/18C22C38/02C22C38/04C22C38/06C22C38/42
Inventor 禹仁秀朴浚植郑谱永李钟凤金正吉
Owner POHANG IRON & STEEL CO LTD
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