Abstract: A system for supporting, guiding and controlling a welding head to maintain the welding head normal to the instantaneous surface contour of overlapping, convoluted metal sheets to weld the same together. The system is capable of being supported on the convoluted metal sheets regardless of the relative orientation (vertical, oblique or downwardly or upwardly horizontal) of the sheets. In order to maintain a preselected penetration, consistently throughout the welding of the sheets, the orientation of the weld head, the amount of heat developed at the weld head and the rate of speed of travel of the weld head are precisely regulated. The orientation of the weld head relative to the sheet is controlled by a mechanical sensor which activates a preprogrammed configuration device displaying characteristics substantially identical with any particular departure from the normally linear surface of the sheets.

Abstract: A pilot light harness for a gas stove including at least one pilot light gas supply tube one end of which is sealingly disposed in a pilot light supply tube manifold or fitting. A method is disclosed for slidingly inserting a pilot light gas supply tube into a recess in a manifold or fitting to a predetermined depth, and thereafter effecting relative movement, axially, between the tube and the manifold to work the metal in and around said recess so as to effect a gastight sealing bead between the supply tube and the manifold.

Abstract: A structure for providing a high pressure, fluidtight juncture between a tube or tubing and a fitting or body member in which a bore is provided in the fitting. The bore has a non-circular interior wall adjacent its opening and a threaded wall of lesser diameter interiorly of said non-circular portion. The tube has threads at or near one end which engage the threads of the bore. In addition, the tube is upset or displaced axially with the said end held against movement to flow the tubing into fluidtight sealing engagement with the threads, the non-circular portion of the bore and the transverse or lateral wall portion of the bore wall intermediate said threaded and non-circular portion, and with the exterior surface of the fitting at the bore opening.