A prototype of maintenance machine for heat exchanger tubes was developed. It was based on the bench top size device which had been specially designed to have dual functions for fiber inspection and laser cladding in JAEA. A laser processing head was improved mechanically in 2 motions of axial translation and circumferential rotation to insert the heat exchanger tubes. ...
英字タイトル:
Development of Maintenance Machine for Heat Exchanger Tubes by Laser Technology

Laser thermal processing was applied to robotic systems. For the narrow limited space like a 1-inch diameter tube, a compact laser processing head successfully observed the heat exchanger tube inner wall and welded a crack gap. A compact air cooled fiber laser was able to heat an inner wall through a delivery optical fiber. A filler wire feeder for laser cladding was also tested. A compact maintenance robot for petrochemical industrial plants was demonstrated....
英字タイトル:
Development and Deployment of Maintenance Robot with Laser Thermal Processing

The aim of this work presented here is to investigate the applicability of the guided wave testing to detect and evaluate the quality of laser beam butt welding line. First, four test pipes were prepared. All of the pipes were laser beam butt welded from inside of the pipe using laser torch. Two pipes of them were high-quality welded, the others were low-quality. Two different pipe-wall-thicknesses were in each quality. Secondly, Laser beam butt welding line detection and the quality evaluation experim...
英字タイトル:
EMAT-Guided Wave Approach for Detecting and Quality Evaluation of the Laser Beam Butt Welding Line on the Inner Surface of the Steel Pipe