10kW class YAG laser application for heavy components

被引：5

作者：

Ishide, T ^{[1
]}

Tsubota, S ^{[1
]}

Nayama, M ^{[1
]}

Shimokusu, Y ^{[1
]}

Nagashima, T ^{[1
]}

Okimura, K ^{[1
]}

机构：

[1] Mitsubishi Heavy Ind Ltd, Takasago R&D Ctr, Takasago, Hyogo 6768686, Japan

来源：

HIGH-POWER LASERS IN MANUFACTURING | 2000年 / 3888卷

关键词：

high power YAG laser; heavy component; decommissioning; in-process monitoring; hybrid laser welding;

D O I：

10.1117/12.377063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The authors have put the YAG laser of the kW class to practical use for repair welding of nuclear power plant steam generator heat exchanger tubes, all-position welding of pipings, etc. This paper describes following developed methods and systems of high power YAG laser processing. First, we apply the 6kW to 10kW YAG lasers for welding and cutting in heavy components. The beam guide systems we have used are optical fibers which core diameter is 0.6mm to 0.8mm and its length is 200m as standard one. Using these system, we can get the 1 pass penetration of 15mm to 20mm and multi pass welding for more thick plates. Cutting of 100mm thickness plate data also described for dismantling of nuclear power plants. In these systems we carried out the in-process monitoring by using CCD camera image processing and monitoring fiber which placed coaxial to the YAG optical lens system. In-process monitoring by the monitoring fiber, we measured the light intensity from welding area. Further, we have developed new hybrid welding with the TIG electrode at the center of lens for high power. The hybrid welding with TIG-YAG system aims lightening of welding groove allowances and welding of high quality. Through these techniques we have applied 7kW class YAG laser for welding in the components of nuclear power plants.

引用

页码：543 / 550

页数：8