Defects during Plasma Transfer Arc (PTA) beam fusion additive manufacturing (AM) processing of Ti-6Al-4V, including lack of fusion, porosity variations, and solidification cracking, have been monitored using near infrared (1.62 μm) imagery at 300 Hz, 300 μm spatial resolution and melt pool sizes of greater than 12μ. The temperature evolution exhibits a periodic temperature modulation of more th...

Welding of zinc coated sheets in zero gap configuration is of eminent interest for the automotive industry. This Laser welding process would enable the automotive industry to build auto bodies with a high durability in a plain manufacturing process. Today good welding results can only be achieved by expensive constructive procedures such as clamping devices to ensure a defined gad. The welding ...

Selective Laser Melting (SLM) offers great potential for future manufacturing technology. In order to extend its applicability for the processing of high melting materials like molybdenum fundamental process understanding is required. This can be obtained by multi-physical simulations that allow a look into the process. In this contribution a thermofluiddynamical simulation model for laser beam...

Sophisticated computer modeling of the formation of lunar multi-ringed basins by impact indicate that substantial volumes of impact melt are produced, leading to melt bodies hundreds of kilometers in diameter and tens of kilometers deep. The impressively large bodies of magma created by the impact of a projectile 50 to 300 kilometers across might have differentiated, producing a zoned body with...

Abstract Powder bed fusion (PBF) of ceramics is often limited because the low absorptance ceramic powders and lack process understanding. These challenges have been addressed through a co-development customized laser capabilities. The starting powder made mix pure alumina granules, to which metal oxide dopant added increase absorptance. performance different granules parameters depends on large...

In this study, a numerically efficient thermal finite element process model is developed to predict the melt-pool characteristics of directed-energy deposition (DED) process. The uses new technique compute effective surface heat loss terms in form volumetric sink term order avoid redefinition fluxes from free-surfaces after addition every layer. addition, incorporated losses due evaporation and...