Laser ablation of ascidian motor neuron and its swimming behavior of resultant larva

Sakurai, Daisuke; Ueno, Masayasu; Horie, Takeo; Nakagawa, M.; Kusakabe, Takehiro; Tsuda, Motoyuki

doi:10.2142/biophys.43.s237_1

Cited by 1 publication

(2 citation statements)

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“…Micro butt welding with a pulsed laser has often been used for sealing batteries in the automobile and electronics industries [1,2]. A gap in this laser welding is one of the most important manufacturing problems, because the gaps may cause fatal welding defects such as shallow penetrations with underfilling or non-bonded joints.…”

Section: Introductionmentioning

confidence: 99%

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In-process monitoring and adaptive control for gap in micro butt welding with pulsed YAG laser

Kawahito¹,

Kito²,

Katayama³

2007

J. Phys. D: Appl. Phys.

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A gap is one of the most important issues to be solved in laser welding of a micro butt joint, because the gap results in welding defects such as underfilling or a non-bonded joint. In-process monitoring and adaptive control has been expected as one of the useful procedures for the stable production of sound laser welds without defects. The objective of this research is to evaluate the availability of in-process monitoring and adaptive control in micro butt welding of pure titanium rods with a pulsed neodymium : yttrium aluminium garnet (Nd : YAG) laser beam of a 150 µm spot diameter. It was revealed that a 45 µm narrow gap was detected by the remarkable jump in a reflected light intensity due to the formation of the molten pool which could bridge the gap. Heat radiation signal levels increased in proportion to the sizes of molten pools or penetration depths for the respective laser powers. As for adaptive control, the laser peak power was controlled on the basis of the reflected light or the heat radiation signals to stably produce a sound deeply penetrated weld reduced underfilling. In the case of a 100 µm gap, the underfilling was greatly reduced by half smaller than those made with a conventional rectangular pulse shape in seam welding as well as spot welding with a pulsed Nd : YAG laser beam. Consequently, the adaptive control of the laser peak power on the basis of in-process monitoring could reduce the harmful effects due to a gap in micro butt laser welding with a pulsed laser beam.

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Section: Introductionmentioning

confidence: 99%

“…In-process monitoring and adaptive control has been expected as one of the useful procedures to stably produce sound penetration welds without welding defects. Recently, some papers have been devoted to the research of in-process 1 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%