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A Study on the Characteristics of Repair Welding for Mold Steel using Continuous Wave Nd:YAG Laser  

Yoo, Young-Tae (Department of Mechatronics Engineering, Chosun Univ.)
Shin, Ho-Jun (Laser Manufacturing Laboratory, Chosun Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.27, no.11, 2010 , pp. 7-16 More about this Journal
Abstract
In this study, wire was used as the filler material for the laser repair welding, and the phenomenon in which the supplied filler material was melted and beaded down into the specimen was examined with varying laser powers and welding speeds. The optimal processing condition was found to be the laser power of 1,300 W, the welding speed and feed wire supply speed of 0.5 ml/in and the defocused distances of +2mm. At this time, the heat input(E) was $65{\sim}75\;J/mm^2$, and no internal defect occurred. When repair welding was carried out as the optimal processing for the part that had an external defect with the radius of 2mm, the filler metal was melted, resulting in the volume smaller than the defect part and thus causing the part unfilled. Therefore, it was found to be necessary to carry out repair welding two to three times by multiple passes rather than does it only once by single pass.
Keywords
Repair Welding; Nd:YAG Laser; Feed Wire Metal; Heat Input; Micro Structure; Hardness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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