[논문]Underwater Laser Cutting of Thick Stainless Steel in Various Cutting Directions for Application to Nuclear Decommissioning

Shin, Jae Sung; Oh, Seong Y.; Park, Seung-Kyu; Kim, Taek-Soo; Park, Hyunmin; Lee, Jonghwan

doi:10.7733/jnfcwt.2021.19.3.279

Underwater Laser Cutting of Thick Stainless Steel in Various Cutting Directions for Application to Nuclear Decommissioning 원문보기

Journal of nuclear fuel cycle and waste technology = 방사성폐기물학회지, v.19 no.3, 2021년, pp.279 - 287

Shin, Jae Sung (Korea Atomic Energy Research Institute) , Oh, Seong Y. (Korea Atomic Energy Research Institute) , Park, Seung-Kyu (Korea Atomic Energy Research Institute) , Kim, Taek-Soo (Korea Atomic Energy Research Institute) , Park, Hyunmin (Korea Atomic Energy Research Institute) , Lee, Jonghwan (Korea Atomic Energy Research Institute)

Abstract ▼ AI-Helper

For application in nuclear decommissioning, underwater laser cutting studies were conducted on thick stainless-steel plates for various cutting directions using a 6 kW fiber laser. For cutting along the horizontal direction with horizontal laser irradiation, the maximum cutting speed was 110 mm·min-1 for a 48 mm thick stainless-steel plate. For cutting along the vertical direction with horizontal laser irradiation, a maximum speed of 120 mm·min-1 was obtained for the same thickness, which confirmed that the cutting performance was similar but slightly better. Moreover, when cutting with vertically downward laser irradiation, the maximum cutting speed was 120 mm·min-1 for a plate of the same thickness. Thus, the cutting performance for vertical irradiation was nearly identical to that for horizontal irradiation. In conclusion, it was possible to cut thick stainless-steel plates regardless of the laser irradiation and cutting directions, although the assist gas rose up due to buoyancy. These observations are expected to benefit laser cutting procedures during the actual dismantling of nuclear facilities.

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표/그림 (11)

그림 Fig. 1. Underwater laser cutting head used in this study: (a) internal scheme and (b) photo.
그림 Fig. 2. Experimental setup for underwater laser cutting with horizontal laser irradiation.
그림 Fig. 3. Experimental setup for underwater laser cutting with vertically downward laser irradiation.
그림 Fig. 4. Front, rear and side views of the 48 mm thick stainless-steel plate after underwater cutting along the horizontal direction with horizontal laser irradiation.
그림 Fig. 5. Front, rear and side views of the 48 mm thick stainless-steel plate after underwater cutting along the vertical direction with horizontal laser irradiation.
표 Table 1. Cutting results of 48 mm thick stainless-steel plate after underwater cutting along the horizontal direction with horizontal laser irradiation
표 Table 2. Cutting results of 48 mm thick stainless-steel plate along the vertical direction with horizontal laser irradiation
그림 Fig. 6. Views of the cut specimen for 47 mm thick stainless-steel plate after underwater cutting from the bottom to the top in the upward direction.
그림 Fig. 7. Views of the cut specimen for 46 mm thick stainless-steel plate after underwater cutting with 90° change of direction.
그림 Fig. 8. Front, rear and side views of the 48 mm thick stainless-steel plate after underwater cutting with vertically downward laser irradiation.
표 Table 3. Cutting results of the 48 mm thick stainless-steel plate with vertically downward laser irradiation

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