Experimental investigation of transient temperature characteristic in high power fiber laser cutting of a thick steel plate. (October 2016)

• Record Type: Journal Article
• Authors: Phi Long, Nguyen; Matsunaga, Yukihiro; Hanari, Toshihide; Yamada, Tomonori; Muramatsu, Toshiharu
• Is Part Of: Optics & laser technology. Volume 84(2016)
• Page Start: 134
• Page End: 143
• Publication Date: 2016-10
• Subjects: High power laser -- Laser cutting -- Thick steel -- Temperature measurement -- Thermography -- Two-color thermometer; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2016.05.005
• Languages: English
• ISSNs: 0030-3992

Abstract

Abstract: Experiment of temperature measurement was performed to investigate the transient temperature characteristics of molten metal during laser cutting. The aim of this study was to establish a method for measuring the surface temperature variation near the molten pool correlated with changes in cutting parameters. The relationship between temperature inside the kerf cut and characteristic of the cut surface was investigated by using thermography and thermocouples. Results show strong correlations between the transient temperatures and the thermal image for different cutting conditions. In addition, two-color thermometer has been used to obtain radiation intensity emitted from the irradiating zone as a function of operating conditions. Experiments have shown that one can detect the cutting quality by characterization of the surface temperature during laser cutting process. Abstract : Highlights: We evaluate the laser cutting performance of 30 mm thick steel given by the temperature measurement. There exists a correlation between the transient temperature characteristics and characteristics of cut surfaces. High temperature region appears and fluctuates for failure cutting case. Temperature is kept relatively constant for successful cutting case. This result provides very useful information for temperature monitoring in adaptive control systems.