Prevention of solidification cracking by use of a diode laser superposition in pulsed laser beam welding

In situ observation and reduction of hot-cracks in laser additive manufacturing

“…This shows an alternative to modifying the thermal field using laser scanning strategies. In welding, pulsed lasers have been reported [29][30][31] to inhibit the propagation of cracks by designing ramp-down pulse shaping but also reducing crack sensitivity by appropriately increasing the average laser power and pulse frequency. These changes effectively reduce the solidification rate, thermal gradient, and solidification stresses.…”