Acute pancreatitis is usually caused by a gallstone getting stuck in the bile duct on its way from the gallbladder into the small intestine. Since the bile duct shares the same opening with the pancreatic duct, a sudden obstruction of the pancreatic opening will cause pancreatic juices to back up into the pancreas.
A welder or welder operator is a tradesperson who specializes in welding materials together. The term welder refers to the operator, the machine is referred to as the welding power supply. The materials to be joined can be metals (such as steel, aluminum, brass, stainless steel etc.) or varieties of plastic or polymer.his article is about welding as a trade. For the machine used to power arc welding procedures, see Welding power supply. For the album by Elizabeth Cook, see Welder (album) .
The main job of symbols is to convey to the welder where to weld, the joint type, how much filler material or metal is to be used, and how much of it needs to be in or on the joint, on a set of plans. Side Bar: The American Welding Society (AWS) is responsible for creating the symbol standards.