It is known that the light absorptivity of pure copper depends on temperature in the case of using a near infrared (NIR) laser. In laser welding using NIR lasers, since the temperature of the base material rapidly increases at the time of laser irradiation, it is considered that the control of heat input is difficult because the absorptivity also changes rapidly. On the other hand, it is known that blue diode lasers have less behavior of generating a molten pool in welding of pure copper, and high quality weld beads can be obtained. In this study, a bead-on-plate welding of pure copper was performed using a high-intensity blue diode laser with an output of 200W, a spot diameter of 100μm, and a power density of 2.6×10~6 W/cm~2. In order to investigate the influence of the wavelength of the laser on the welding quality, a bead-on-plate welding with a near infrared laser was also performed for the comparison with a blue diode laser. Finally, we will discuss the influence of laser wavelength on weld quality in bead-on-plate welding of pure copper.
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机译：众所周知，纯铜的光吸收率取决于使用近红外（NIR）激光的情况下的温度。在使用NIR激光器的激光焊接中，由于在激光照射时基材的温度迅速增加，因此认为热输入的控制是困难的，因为吸收率也迅速变化。另一方面，已知蓝色二极管激光器在焊接纯铜的焊接中产生熔池的行为较低，并且可以获得高质量的焊珠。在该研究中，使用高强度的蓝二极管激光器进行纯铜的珠子板焊接，其输出为200w，光斑直径为100μm，功率密度为2.6×10〜6 w / cm〜 2。为了研究激光波长对焊接质量的影响，还对与蓝二极管激光器进行比较，还执行具有近红外激光的珠子板焊接。最后，我们将讨论激光波长对纯铜板焊珠焊接焊接质量的影响。
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