| Summary: | 碩士 === 國立高雄應用科技大學 === 機械工程系 === 105 === ABSTRACT
High-power fiber laser provides excellent beam performance, resulting in its weld-
ing, cutting, marking, drilling and precision machining and other fine laser processing
applications are difficult to compete. Optical fiber laser is lightweight, compact and
have long life advantages, also it has small spot size with high energy density charac-
teristics, which is very suitable for welding small parts. In this thesis, 200W fiber laser
was used for stacking welding. Both 300 μm and 300 μm stainless steel sheets were
used as test material. The L9 (34
) orthogonal table experiment was combined with four
control factors (pulse width, power , laser focus and N2 flow rate) with high、medium、
low levels to sort the experiment for the relationship between the factors and welding
thrust. The combination of the optimization parameters during maximum welding thrust
is obtained by the combination of the quality characteristics and the response table. The
ANOVA analysis shows that the contribution of the main factors when the push force
is the highest during pulse width is 51.76%, and laser power of 40.9%. The best com-
bination of parameters is pulse width: 19000 μs, power: 170 Watt, The laser focus of
185 mm and N2 gas supply 100 LPM. Resulting with best average push force is 39.889
Keywords: fiber laser, laser welding, spot welding
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