Abstract: A tool for inspecting and verifying weld beads in a pipeline includes a plate-like structure which has a surface and edges adapted for inspecting and verifying various weld bead attributes. The surface is imprinted with several identification marks, including for example, wall thicknesses and ratios of weld bead width to wall thickness. The tool can be used to verify weld bead convexity, weld bead concavity, and weld bead width for many different wall thicknesses. The tool is capable of verifying weld bead width and axial alignment of successive sections of pipe along the pipeline. All verifications and measurements are visual and tactile, without need for complex machinery or calculations, and can be accomplished with a single, lightweight tool. Additionally, a single tool can be used to verify weld beads for a variety of different pipe thicknesses.

Abstract: A tool for inspecting and verifying weld beads in a pipeline includes a plate-like structure which has a surface and edges adapted for inspecting and verifying various weld bead attributes. The surface is imprinted with several identification marks, including for example, wall thicknesses and ratios of weld bead width to wall thickness. The tool can be used to verify weld bead convexity, weld bead concavity, and weld bead width for many different wall thicknesses. The tool is capable of verifying weld bead width and axial alignment of successive sections of pipe along the pipeline. All verifications and measurements are visual and tactile, without need for complex machinery or calculations, and can be accomplished with a single, lightweight tool. Additionally, a single tool can be used to verify weld beads for a variety of different pipe thicknesses.

Abstract: A tool for inspecting and verifying weld beads in a pipeline includes a plate-like structure which has a surface and edges adapted for inspecting and verifying various weld bead attributes. The surface is imprinted with several identification marks, including for example, wall thicknesses and ratios of weld bead width to wall thickness. The tool can be used to verify weld bead convexity, weld bead concavity, and weld bead width for many different wall thicknesses. The tool is capable of verifying weld bead width and axial alignment of successive sections of pipe along the pipeline. All verifications and measurements are visual and tactile, without need for complex machinery or calculations, and can be accomplished with a single, lightweight tool. Additionally, a single tool can be used to verify weld beads for a variety of different pipe thicknesses.

Abstract: A tool for inspecting and verifying weld beads in a pipeline includes a plate-like structure which has a surface and edges adapted for inspecting and verifying various weld bead attributes. The surface is imprinted with several identification marks, including for example, wall thicknesses and ratios of weld bead width to wall thickness. The tool can be used to verify weld bead convexity, weld bead concavity, and weld bead width for many different wall thicknesses. The tool is capable of verifying weld bead width and axial alignment of successive sections of pipe along the pipeline. All verifications and measurements are visual and tactile, without need for complex machinery or calculations, and can be accomplished with a single, lightweight tool. Additionally, a single tool can be used to verify weld beads for a variety of different pipe thicknesses.

Abstract: A pressure measuring device measures the pressure of a gas flowing in two pipes to be welded together at a joint. The device includes a collar having a groove formed therein and a pressure sensing device in fluid communication with the groove. The groove is formed to surround and seal a portion of the perimeter of the joint to be welded, while the collar is formed to surround and seal an additional portion thereof. Thus, the groove and the outer surface of the pipes to be welded defined a sealed cavity into which the flowing gas may leak. The pressure within this cavity is thus an indicator of the pressure of the flowing gas inside the pipe.

Abstract: A method and device for sampling the pressure of inert purge gas flowing in two pipes to be welded at a joint comprising a sleeve for encircling the pipes during their coaxial alignment in end to end abutment, and an associated element with the sleeve forming a sealed chamber surrounding the joint and receiving gas that leaks out from the joint at the same pressure as the gas in the pipes, and a connection for connecting the chamber for measuring the pressure of the gas therein as an indication of the pressure of the gas flowing in the pipes; the method includes clamping the device around the pipes or sliding the pipes into the device.

Abstract: A backpressure controlling device for welding purge gas comprising a vertically oriented cylindrical housing, a water outlet at the bottom of the housing and a water outlet in the wall of the housing and spaced up from the bottom of the housing, the water outlets defining a water volume space in the housing, a gas inlet tube and a concentric gas outlet tube surrounding the gas inlet tube, the gas inlet tube being adjustably positioned in the housing and having a length such that one end thereof extends below the water inlet and the other end thereof extending out of the housing for connection to a pipeline carrying purge gas, the gas outlet tube being secured to a spacer wall spaced from the upper end of the housing and extending to a point above the water outlet and communicating with the exterior of the housing through openings in the wall of the housing above the spacer wall, the housing being of a size such that the volume of the space above the water inlet is at least about one and one-half times as grea

Abstract: A method and device for welding pipe onto a piping network at a joint comprising introducing an inert purging gas under pressure at a substantially constant flow rate at one end of the pipe away from the weld joint, providing a flow restriction at the end of the piping network away from the weld joint, diverting a minor portion of the inert purging gas flowing through the piping network into and through a constant back pressure maintaining device for maintaining a substantially constant back pressure on the inert purging gas in the piping network during the welding, whereby any changes in back pressure occurring in the piping network cause a greater or lesser amount of the inert purging gas to flow through the constant back pressure maintaining device, thereby enabling production of precise and highly reproducible welds with an orbital welder.