A method for welding profiled elements in plastic material includes: preparing two profiled elements, arranged with respective weld zones facing one another; making a groove corresponding to at least one weld zone of the profiled elements, the grooving performed by a removal operation on a peripheral edge of at least one profiled element; heating the weld zones; coupling the zones to be welded to one another, pressing the profiled elements together to keep the zones to be welded in reciprocal contact. The coupling step includes: a sub-step of melting the zones to be welded into one another in order to define a welding bead; a sub-step of making a containing compartment defined by the groove, the welding bead being made internally of the containing compartment; and the step of arranging a containing presser in correspondence to the containing compartment for preventing exit of the welding bead from the compartment itself.

A method and a device (10) for welding at least two profiled sections (1) for window or door frames or leaves uses a heating unit (4) introduced between the profiled sections (2, 3) to be joined. At least two heating elements (5, 6) of the heating unit melt the profiled section ends (2, 3) at the end surfaces to be joined. In order to chamfer, in particular remove, a profiled section edge layer (20) of the profiled section ends (2, 3) along the layer surfaces (12, 13) thereof, at least one tool, in particular at least one cutting blade (7, 8), is arranged on the heating elements (5, 6) and is moved such that the material (9) to be melted is displaced into the profiled section interior (11) or into the interior (12) of the profiled section chambers (13). A compression device compresses the profiled section ends (2, 3).

A seal obstructs the migration of particulates and precipitation into a pipe fusion chamber through its pipe stick entry and pipeline exit passages. Sheets of cloth serially overlap the anticipated center axis of a pipe stick/pipeline which will pass through the machine. The outer edge of each sheet is pleated and fixed to a frame contiguous with the perimeter of the passage and the inner edge of each sheet is gathered on an elastic band. When a face of a pipe stick/pipeline pushes the sheets away from the frame, the pleats and bands cooperate to allow the inner edges of the sheets to slide over the face and hug substantially the entire outer circumference of the pipe stick/pipeline.

A gasket welding apparatus (10) comprising: a pair of opposed clamping members (16A, 16B) for supporting corresponding first and second lengths of gasket material. The clamping members (16A, 16B) being moveable towards and away from one another by an actuator (58). The gasket welding apparatus (10) comprises a heating element (30), the heating element (30) is moveable between a first position in which it is removed from the clamping members and a second position in which it is disposed between the clamping members.

A method and a system including a welding device, an inspection device having an inspection head having two sensors, a controller, and a memory for assessing a butt weld of plastic pipes or fittings in a welding device.