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By A Addison and A Allison
Parts manufactured by additive manufacturing (AM) processes often have microstructures that are different from ‘conventional’ materials, such as cast or wrought products. It may be necessary to join such parts to other AM parts or to cast or wrought materials using conventional arc welding processes. In such circumstances, the effect of the microstructure of the AM part on the weld is of interest.
This report describes work carried out to prepare a limited number of illustrative examples to assist decisions about future development work in this area. The parts to be welded were fabricated by laser powder bed fusion (PBF) or directed energy deposition-arc (DED-Arc), sometimes referred to as wire plus arc additive manufacture (WAAM)
Stainless steel PBF weld macro cross-section.
Ti-6Al-4V PBF weld macro cross-section.
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