Method for laser welding and welded metal using the same

A laser welding and laser technology, used in laser welding equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of laser welding of difficult-to-weld blank components, and achieve the effect of excellent welding characteristics

Inactive Publication Date: 2015-05-06
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to apply this technology to laser welding of tailor-welded blank assemblies, which have restrictions on the shape of the joints, and especially for butt joints

Method used

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  • Method for laser welding and welded metal using the same
  • Method for laser welding and welded metal using the same
  • Method for laser welding and welded metal using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Cold-rolled steel sheets (CR) and galvanized steel sheets (GI) having the compositions (wt%, the remainder being iron and unavoidable impurities) and thicknesses shown in Table 1 below were prepared, respectively.

[0063] [Table 1]

[0064]

[0065] Laser welding was carried out using cold-rolled steel sheets and galvanized steel sheets of A and B. At this time, using 6kW of CO 2 The laser welder performed laser welding, and performed butt welding under conditions such as a laser output of 6 kW and a welding speed of 2 m / min that the formation of porosity was relatively significant by a preliminary test.

[0066] Porosity defects of laser welded seams were determined under KS B0845. When the steel material has a thickness of 10 mm or less, it is classified as grade 1 if the defect point within the visible test area of ​​10×10 mm is 1 or less; if the defect point is 3 or less, it is classified Class 2; Class 3 if the defective point is 6 or less; and Class 4 if th...

Embodiment 2

[0078] By using CR-A (thin plate) and CR-B (thick plate) in Table 1, when performing welding, change the distance from the interface to the thick plate during laser irradiation and change the welding heat input under the conditions of Table 3 below In the case of , the welding defect and crack occurrence rate of the weld was measured, and the results are shown in Table 3.

[0079] Welding was performed by supplying helium gas at a flow rate of 20 l / min to the laser irradiated part and the rear of the laser irradiated part, and welding heat input was controlled by changing the laser output and welding speed.

[0080] In Table 3, welding defects were observed by paying attention to the shape of the bead, and the sag was determined by setting a standard case in which the welded metal part sags 0.1 mm compared to the base material. In addition, meltdown refers to a case where a sinking phenomenon is a main cause of molten metal dripping and widely formed voids. The cracking incid...

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Abstract

The present invention relates to a laser welding method that is capable of preventing defects such as pores or pits from being formed in a weld and improving formability of the weld during laser welding, and a welded member using the same. In the laser welding method of performing welding by irradiating laser onto a portion to be welded, there are provided a laser welding method of including supplying a shielding gas to a laser irradiation part and a rear side of the laser irradiation part, and a welded member having welds formed therethrough.

Description

technical field [0001] The present invention relates to a laser welding method, more specifically, to a laser welding method for tailor welded blanks (Tailor Welded Blanks, TWB). Background technique [0002] In the automotive industry, high-strength steel materials have recently been used to reduce the weight of car bodies in accordance with the strengthening of environmental regulations. In addition, the forming method trend is to replace the existing stamping process with Tailored Welded Blank (TWB), hydroforming and other methods. [0003] Tailored welded blanks refer to so-called "custom cut and welded steel plates". Tailored welded blanks are items processed to have a desired shape by welding the cut steel plates after steel plates having different thicknesses, strengths, and materials are cut into appropriate sizes and shapes. Tailored welded blanks can greatly reduce costs compared to the case of directly welding processed steel plates. Although applicable welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/14
CPCB23K26/147B23K26/26B23K2103/04B23K2101/18B23K26/32B23K2101/006B23K2103/50Y10T428/12493B23K26/14B23K26/123
Inventor 禹仁秀
Owner POHANG IRON & STEEL CO LTD
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