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紀要論文

紀要論文

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Transactions of JWRI.36(2) P.11-P.15

Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel

大阪大学接合科学研究所

英語

2007-12

http://hdl.handle.net/11094/7955

Fiber laser has been receiving great attention due to its advantages of high efficiency, high power and high beam quality, and is expected as one of the most desirable heat sources for high-speed and deep-penetration welding. In this research, therefore, in bead-on-plate welding of Type 304 stainless steel plates with 6 kW fiber laser, the effects of laser power, power density and welding speed on the formation of sound welds were investigated with four laser beams of 130, 200, 360 and 560 μm in spot diameter, and their welding phenomena were explained with high-speed video cameras and X-ray transmission real-time imaging system. The weld beads showed a keyhole type of penetration at all diameters, and the maximum penetration of 11 mm in depth was obtained at 130 μm spot diameter and 0.6 m/min welding speed. It was found that the laser power density exerted a remarkable effect on the increase in weld penetration at higher welding speeds, and sound partially-penetrated welds without welding defects such as porosity, underfilling or humping could be produced at wide process windows of the welding speeds between 4.5 and 10 m/min with fiber laser beams of 360 μm or 560 μm in spot diameter. The high-speed video observation pictures and the X-ray images of the welding phenomena at 6 m/min welding speed and 360 μm spot diameter show that a sound weld bead was formed as a result of the long molten pool suppressing and accommodating spattering and a stable keyhole generating no bubbles from the tip, respectively.

Investigation of High-Power Fiber Laser Welding Phenomena of Stainless Steel

大阪大学接合科学研究所

英語

2007-12

Transactions of JWRI

36

2

11

15

03874508

http://hdl.handle.net/11094/7955