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Research on Laser Welding Technology Based on Galvanometer Scanning

Author: HuangDongLin
Tutor: YangYongQiang
School: South China University of Technology
Course: Materials Processing Engineering
Keywords: Laser welding Galvanometer scanning Process parameters Weld profile Weld strength
CLC: TG456.7
Type: Master's thesis
Year: 2010
Downloads: 208
Quote: 0
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Abstract


Based on the galvanometer scanning the laser welding technology, compared with the previous fixed optical path of the laser welding technology, welding speed, accurate positioning, convenient and flexible. Abroad has been a large number of technology applied to the field of materials connected domestic galvanometer scanning laser welding technology is only in its early, either theoretical or applied research with foreign countries there is a big difference, therefore, to carry out the galvanometer The scanning laser welding technology has important significance. The design of the the galvanometer scanning laser welding experimental program, including the selection of welding materials, welding method. Welding quality test methods, optical microscope observation and measurement of the morphology and size of sample welding, and welding samples for tensile tests to measure welding quality of the sample surface morphology and tensile strength. Single factor method, the galvanometer scanning laser spot welding and seal welding experiments on 304 stainless steel. The process parameters (laser power, pulse frequency, pulse width, angle of incidence, the defocus amount) welding morphology and intensity to the results show that the the galvanometer scanning laser spot welding, weld width with increasing angle of incidence, increases, but gradually decreases maskelynite. With the pulse energy and pulse width increases, the surface of the solder increased in diameter, and is significantly greater than the pulse width of the pulse energy on the surface of the diameter of the solder; galvanometer scanning laser seal welding, as the current increases, the weld width increases. With the increase in the pulse width also increases the width of the weld. Through comparative analysis found that the seal welding pulse current and pulse width to increase much faster than the solder joint size due to the increase in speed galvanometer scanning laser spot welding the weld width increase. With the pulse frequency increases, the width of the weld increases first, after essentially unchanged. The welding of thin plate material suitable for use positive defocus, in the case of the same amount of defocus is obtained from the naphthalene weld surface than the negative defocus To smooth appearance. Tensile test results show that, when the other parameters fixed, changing one parameter, the welding strength of the sample showing a trend first and then decreases with the increase of this parameter. Galvanometer scanning laser welding technology in the field of batteries and braces. In this paper, the galvanometer scanning principle of laser welding, welding parameter selection, and welding quality testing aspects of a comprehensive study. This work provides a theoretical and technical support for the galvanometer scanning laser welding equipment widely used.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Special welding > Laser welding
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