A welding fixture apparatus has a base and an adjustable head configured for adjustable engagement with one or more workpieces and methods of use.

An internal clamping and welding device for joining tubes by their distal ends, the device comprising movement means in order to be moved inside the tubes, separate clamping means for cooperating with the inner surfaces of the tubes to be welded, and a welding head mounted so as to be able to both rotate about a longitudinal axis of the tubes, and also pivot in order to be tiltable relative to a support of the clamping means.

An internal clamping and welding device for joining tubes by their distal ends, the device comprising movement means in order to be moved inside the tubes, separate clamping means for cooperating with the inner surfaces of the tubes to be welded, and a welding head mounted so as to be able to both rotate about a longitudinal axis of the tubes, and also pivot in order to be tiltable relative to a support of the clamping means.

An auxiliary device for installing piston rings is described, which includes a mounting base, a transmission device, a connecting rod and a bracing structure. The mounting base includes a platform, an opening hole and an accommodating space. The transmission device is disposed in the accommodating space and includes a guide screw rod, a sliding base and a motor. The sliding base is slidably screwed on the guide screw rod. The motor can drive the guide screw rod to move the sliding base. The connecting rod is disposed on the sliding base. An external diameter of the piston ring while being put around the connecting rod is greater than an inner diameter of the opening hole. The bracing structure is disposed on the connecting rod. An external diameter of the bracing structure is getting greater from one end connected to the connecting rod. The bracing structure can accommodate the piston.

The present invention concerns methods and apparatus for forming a clad product, such as a clad pipe or tube. Particular embodiments include a method for metallurgically bonding cladding material onto a metal substrate, the method including a step of providing a metal substrate comprising a pipe or a tube having a cladding composition arranged along an interior surface of the substrate to form a coated substrate, the interior surface arranged within an interior cavity of the substrate. A further step includes inserting a heat source into an interior cavity of the substrate, the heat source comprising an infrared, microwave, or radio frequency heat source, the heat source being mounted on a heat source-retaining housing, the housing comprising a cantilevered structure. An additional step includes applying heat discharged from the heat source to the coated substrate along the coated interior surface until the cladding composition metallurgically bonds to the substrate.

The invention is directed at the mechanical engineering industry field. More in detail, the invention concerns an orbital welding head (1) for welding tubes (2) to tube plates (3) of heat-exchangers comprising, operationally connected to each other: an electrode holder welding torch (4), supply lines for a welding current and technical gases; a rotating joint (6) comprising a hollow fixed distributor body, a bush comprising an external thread adapted to cooperate with a corresponding internal thread of said fixed distributor body and adapted to be fitted on a rotating shaft, and a plurality of flexible blades adapted to deform elastically to ensure the contact and transmission of the welding current from said fixed distributor body a said rotating shaft. Said flexible blades each comprise a first and second end, where each first end protrudes axially from said bush and each second end is free, so as to be cantilevered with respect to said bush to elastically clamp said rotating shaft.