Other kinds of welding. Some kinds of welding do not use an electric arc. They might use a flame, electricity without an arc, an energy beam, or physical force. The most common type of welding that does not use an arc is called gas welding.
TDW - Total Diamond Weight. A term usually used when there is more than one diamond in a particular piece of jewelry. The combined weight of all of the (diamond) stones.
The Technical Director (TD) is usually a senior technical person within a software company, engineering firm, film studio, theatrical company or television studio. This person usually possesses the highest level of skill within a specific technical field and may be recognized as an expert in that industry.