Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld.he use of any shielding gas containing an oxygen compound, such as carbon dioxide, quickly contaminates the tungsten electrode, making it unsuitable for the TIG process. In 1953, a new process based on GTAW was developed, called plasma arc welding.
Another cause of ridges on fingernails is lack of moisture. If your nails are ridged or cracked, massaging the nails or cuticles with a moisturizing cream or oil can be very beneficial, as can increasing the amount of water you drink.
Jessica Krant, M.D., a fellow of the American Academy of Dermatology and assistant clinical professor of dermatology at SUNY Downstate Medical Center, agrees: Lengthwise ridges, if they are evenly spaced over the whole nail, are common and harmless, and generally associated with normal aging and the nail's increasing inability to retain moisture, she says.