Abstract: A reduced volume socket body and a reduced volume tube are used in a pressure gauge system in semi-conductor fabrication process equipment. The socket body includes an outlet and the tube has an end connected to the outlet. The outlet is a shaped, weld prep formed on the socket body having an inner surface. A continuous seat is formed on the outlet and includes a seat thickness. The tube has an inner wall and an outer wall defining a wall thickness which is substantially the same as the seat thickness. The end of the tube is engaged with the seat so that the inner wall of the tube and the inner surface of the outlet are substantially aligned to form a crevice free tube-to-socket connection.

Abstract: A pressure gauge fabricated from directly welded pieces of dissimilar metals. The gauge includes a casing, a tubular socket, and a Bourdon tube. The casing is fabricated of stainless steel and has an aperture with a flange. The socket is fabricated of aluminum bronze and is positioned within the aperture and flange in line contact therewith. The tubular socket also has a bore. The Bourdon tube is fabricated of stainless steel and is positioned within the bore in line contact therewith. Single weld lines exist along the lines of contact between the casing and the socket and between the socket and the Bourdon tube as caused by welding without a filler or insert material operatively associated with the single weld lines.