Engineering topics

Todd, Douglas M.

Publications and source records attributed to Todd, Douglas M..

4 records

NASA NTRS1999

Enhanced vacuum arc vapor deposition electrode

A process for forming a thin metal coating on a substrate wherein a gas stream heated by an electrical current impinges on a metallic target in a vacuum chamber to form a molten pool of the metal and then vaporize a portion of the pool, with the source of the heated gas stream being on one side of the target and the substrate being on the other side of the target such that most of the metallic vapor from the target is directed at the substrate.

Weeks, Jack L.↗

NASA NTRS1995

Removable Mandrels For Vacuum-Plasma-Spray Forming

Improved mandrels developed for use in vacuum-plasma-spray (VPS) forming of refractory metal and ceramic furnace cartridge tubes. Designed so after tubes formed on them by VPS, mandrels shrink away from tubes upon cooling back to room temperature and simply slip out of tube.

Krotz, Phillip D.↗

NASA NTRS1991

Monitoring Weld Penetration Via Gas Pressure

Welding monitor uses pressure on back side of weldment to monitor penetration of weld. Sudden drop on pressure chart means weld pool has fully penetrated; sudden rise means pool no longer extends through joint. Devised to ensure full penetration along full lengths of weld joints, when direct observation of back sides by visual inspection, x rays, or fiber optics not possible. Used in initial development of welding parameters or during production as safeguard.

Coby, J. Ben, Jr.↗

NASA NTRS1987

Use of voice recognition for control of a robotic welding workcell

This paper describes work underway to evaluate the effectiveness of voice recognition systems as an element in the control of a robotic welding workcell. Factors being considered for control include program editor access security, preoperation checklist requirements, welding process variable control, and robot manipulator motion overrides. In the latter two categories, manual vocal control is being compared against manual tactile control and fully automatic control in terms of speed of response, accuracy, stability, reliability, and safety.

Watson, J. Kevin↗