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PULSED LASER MACHINING METHOD AND PULSED LASER MACHINING EQUIPMENT, IN PARTICULAR FOR WELDING WITH VARIATION OF THE POWER OF EACH LASER PULSE
PULSED LASER MACHINING METHOD AND PULSED LASER MACHINING EQUIPMENT, IN PARTICULAR FOR WELDING WITH VARIATION OF THE POWER OF EACH LASER PULSE
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机译:脉冲激光加工方法和脉冲激光加工设备,特别是焊接时,每个激光脉冲功率的变化
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摘要
A laser machining method includes A) generating, by a laser source, a laser beam having an initial wavelength between 700 and 1200 nanometers of laser pulses; B) doubling frequency of one part of the laser beam by a non-linear crystal; C) varying power throughout each emitted laser pulse so that the power profile has a maximum peak power or part of the pulse with a maximum power in an initial sub-period, and throughout an intermediate sub-period of longer duration than the initial sub-period, a lower power than the maximum power. The maximum power value is at least two times higher than the mean power throughout the laser pulse and an increase time to maximum power from a start of each laser pulse is less than 0.3 milliseconds. The machining method can concern welding highly reflective metals, copper, gold, silver, or an alloy including one of these metals.
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