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 reporting for this involves determining the amount of tips declared that covered the difference between minimum wage and tipped wage rate. Those tips are called Tips Deemed to be Wages (TDW) - the tips that the employee declared that were considered to be wages for reporting purposes.