METHODS AND APPARATUS FOR SPOT WELDING WORKPIECES USING LASER PULSES

摘要

A laser welding method includes guiding laser pulses to a workpiece surface of workpieces and adjusting a power of the laser pulses according to a time pulse curve to spot weld the workpieces together. The time pulse curve has a first pulse section having a rising pulse flank for generating a melting temperature and subsequently a vaporization temperature in the workpieces, a second pulse section for melt bath generation having a vapor channel in the workpieces, a third pulse section having a pulse flank which initially drops vertically to at least ¾ of the power at an end of the second pulse section and subsequently drops more flatly for reversion of the vapor channel, and a fourth pulse section having a low pulse plateau and a level of between ⅓ and ¼ of the power at the end of the second pulse section for oscillation of the melt.

主权项

1. A laser welding method of spot welding workpieces using laser pulses, comprising:
guiding the laser pulses to a workpiece surface of the workpieces; and chronologically adjusting a power of the laser pulses according to a time pulse curve to spot weld the workpieces together, wherein the time pulse curve comprises:
a chronologically first pulse section in a form of a rising pulse flank for generating a melting temperature and subsequently a vaporization temperature in the workpieces,a chronologically second pulse section as a main pulse section for melt bath generation having a vapor channel in the workpieces,a chronologically third pulse section in a form of a pulse flank which initially drops vertically to at least ¾ of the power at an end of the main pulse section and subsequently drops more flatly for reversion of the vapor channel, anda chronologically fourth pulse section in a form of a low pulse plateau and having a level of between ⅓ and ¼ of the power at the end of the main pulse section for oscillation of the melt.