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.
TDD is an abbreviation for telecommunications device for the deaf. It is an electronic device that was invented to make it easier for people who have hearing or speaking disabilities. In some instances, the TDD is also referred to as TTY, which can stand for typewriter or teletypewriter. Description The modern-day TDD is designed as a sort of mini-computer, consisting of a keyboard and an LED or LCD screen to display the electronic text being typed.