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Analysis of mechanism of plasma and spatter in CO2 laser welding of galvanized steel

โœ Scribed by Hyunsung Park; Sehun Rhee

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
206 KB
Volume
31
Category
Article
ISSN
0030-3992

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โœฆ Synopsis

In laser welding, quality, reproducibility and formability are required. That is the great problem in the automation of the laser welding process. Therefore, construction of an on-line process monitoring system of high accuracy is requested.

The light which is emitted from plasma and spatter in laser welding was detected by photo-diodes. It was found that the light intensity depends on welding speed, laser power and ยฏow rate of assist gas. The relationship between the plasma and spatter and the bead shape, and the mechanism of plasma and spatter were analyzed for on-line laser weld monitoring systems.

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Laser welding of mild steel sheets is carried out under nitrogen assisting gas ambient. Temperature and stress fields are computed in the welding region through the finite element method. The residual stress developed in the welding region is measured using the XRD technique and the results are comp