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) .
Welder and pipefitter are actually two separate careers, though some welders may be pipefitters and vice versa. Welders primarily fuse metal parts together, working on construction projects and for manufacturers.ob Outlook. The number of jobs for welders and pipefitters is expected to increase by 15 and 26 percent, respectively, between 2010 and 2020, according to BLS data. Jobs for welders will be primarily driven by a growing economy, especially in manufacturing and oil production.