1.1 For over 20 years, directed energy deposition (DED) has been used for repair, rapid prototyping, and low-volume part fabrication. Currently, there are at least 6 manufacturers of commercial systems that perform DED. This guide is intended to serve as a guide for defining the technology application space and limits, DED system setup considerations, machine operation, process documentation, work practices, and available system and process-monitoring technologies. 1.2 DED systems comprise multiple categories of machines using laser beam (LB), electron beam (EB), or arc plasma energy sources [typically gas tungsten arc (GTA)], plasma arc (PA), plasma transferred arc (PTA), and gas metal arc (GMA)]. Feedstock typically comprises either powder or wire. Deposition typically occurs either under inert gas (arc systems or laser) or in a vacuum (EB systems). Although these are the predominant methods used in practice, the use of other energy sources, feedstocks, and atmospheres may also fall into this category. 1.3 The values stated in SI units are to be regarded as the standard. No other units of measure are included in this guide. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Increased use of these technologies in government industries, for example, flight critical applications is driving the need for standardization.
Keywordsadditive manufacturing; directed energy deposition; electron beam; laser; arc; arc plasma
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top