Hot-cracks reduction during Laser Beam Welding in vacuum of conventionally cast Alloy-247 LC

摘要

Alloy 247 LC appertains to the group of precipitation-hardening materials and is characterized by good creep rupture resistance at higher temperatures. However, the weldability of Alloy 247 LC is severely limited due to its high tendency to cracking. The present paper identifies parameters for laser beam welding in vacuum with regard to hot crack reduction. Two different laser modes for differentiation of the beam intensity and the seam geometry are investigated. Therefore, crack evaluation is performed by SEM and light microscopy. Furthermore, the parameter dependent distortion is investigated. The results show the potential for welding of Alloy 247 LC with laser beam in a vacuum.