A probe for friction stir welding MMCs, ferrous alloys, non-ferrous alloys, and superalloys, as well as non-ferrous alloys, the probe including a shank, a shoulder, and a pin disposed through the shoulder and into the shank, wherein the pin and the shoulder at least include a coating comprised of a superabrasive material, the pin and shoulder being designed to reduce stress risers, disposing a collar around a portion of the shoulder and the shank to thereby prevent movement of the shoulder relative to the shank, and incorporating thermal management by providing a thermal flow barrier between the shoulder and the shank, and between the collar and the tool.

Friction stir welding using a superabrasive tool

A method for welding a plurality of pipes, including first, second and third pipes, to each other, the method comprising the steps of: (a) providing a clamping apparatus comprising a rigid frame, first and second clamping means for clamping the pipes, said first and second clamping means being supported on the frame; (b) engaging a side of the first pipe with the first clamping means and a side of the second pipe with the second clamping means and with a first end of the first pipe disposed at a welding distance from and in line with a first end of the second pipe; (c) operating a welding apparatus to make a welding seam to connect the respective first ends of the first and second pipes; and (d) moving the clamping apparatus along the second pipe to a second end of the second pipe and repeating steps (b)-(c) to weld the second end of the second pipe to a first end of the third pipe, wherein the method comprising the steps of determining a shape of the first pipe with help of the first clamping means, storing data pertaining to said shape in a memory as shape data, and bringing the second clamping means into engagement with the second pipe based on the shape data.

Method and device for welding pipes

A system and method for performing friction stir welding of non-planar materials having high melting temperatures, wherein a process is provided for performing longitudinal and radial welds on objects such as pipes, flanges, tanks, and shrouds, and wherein an active or passive mandrel provides support for the friction stir welding process.

Out-of-position friction stir welding of high melting temperature alloys

In one embodiment, an apparatus for use in friction stir welding including a friction stir tool, having a shoulder, a non-consumable welding pin extending downward centrally from the shoulder, a first workpiece disposed on a backing workpiece, a second workpiece located a predetermined distance from the first workpiece on the backing workpiece, and a transition strip disposed on the backing workpiece between the first workpiece and the second workpiece, wherein the contact area or a space between the transition strip and the first workpiece defines a first interface and the contact area or a space between the transition strip and the second workpiece defines a second interface, wherein the non-consumable welding pin is rotated over the first interface and the second interface to weld the first workpiece to the second workpiece with the transition strip material incorporated as part of the weld, is disclosed.

Method and apparatus for friction stir welding

A filler material guide nozzle assembly for feeding fusible filler metal wire or other metal forms into reduced-width, high-aspect-ratio (ratio of depth to width) metallic joints with control and stability of the filler metal position as it enters the molten pool area. The filler material guide nozzle assembly is designed with a thin but stiff non-circular cross-sectional shape, with its width dimension significantly greater than its thickness dimension, and can be utilized in very reduced-width welded or otherwise fused joints to provide the accuracy and stability required for reliable filler material addition. During use with welding, brazing and similar processes, the outlet end of the nozzle is located within the joint near the bottom, close to the area to be fused. The width dimension of the nozzle apparatus is oriented parallel to the depth of the weld joint, and the thickness dimension is oriented perpendicular to the depth of the joint. The thickness of the nozzle apparatus is less than the thickness of the joint between the components to be fused with the filler metal, allowing the outlet end of the nozzle to be fitted within the joint and in closer proximity to the molten pool during the joining process.

Apparatus for joining metal components using broad, thin filler nozzle

A method of welding two work pieces that define a connecting zone between them is described. A friction pin is fed at a starting point into the connecting zone and into opposite regions of the work pieces on both sides of the connecting zone. The friction pin is moved in a welding direction along the connecting zone resulting in the work pieces being welded. The friction pin is led out of the connecting zone after welding the work pieces. The friction pin is fed into a sacrificial element while lifting the friction pin.

Method and apparatus for welding two work pieces

A burner for WIG-welding for a welding seam having a rod-shaped tungsten electrode with an electrode tip facing the welding seam, a welding wire guide and a protective-gas feed includes a coolant line connected to the electrode and formed of two adjacent channels extending as feed and discharge lines on mutually opposite sides of the electrode, the electrode tip projecting through a heat-resistant insulating cap overlapping ends of the coolant channels which face towards the electrode tip, and the protective-gas feed including protective-gas feed lines insulatedly fastened to a side of the coolant channels facing away from the electrode, the protective-gas feed lines having a region extending out of the insulating cap and formed with outlet openings directed towards the welding seam.

Burner for wig welding

The invention relates to a method for connecting metal parts (1a to d), especially for closing a crack (4). According to the inventive method, welding is done underwater using a friction stir welding method.

Method for connecting metal parts

Welding appts. for joining two tubes together consists of a welding head assembly (15,16) arranged on a centering system made up of gripping clamps (1,2) which each hold a tube (12) and adjustment devices (4,5,6) which can move one tube with respect to the other in the x, y and z directions. ADVANTAGE - The positioning of the tubes with respect to each other can be remote controlled followed by remote controlled welding.

Butt welding of tubes - using alignment device which remote controlled moves tubes with respect to each other in X, Y and Z direction

The invention relates to a method for welding two work pieces (1, 3) according to the friction stir principle. After the work pieces (1, 3) have been welded, a friction arbour (23) is removed from the joint zone (5) and is lifted (43) and thereby inserted into a sacrificial element (31, 51) either simultaneously or after a forward movement (55) in one of the work pieces (1, 3) has been carried out. The sacrificial element forming a sacrificial area (51) can be formed to one of the work pieces (1, 3) as a component thereof. In a preferred embodiment, the sacrificial element is designed as a separate sacrificial body (31) which is adjacently fixed to at least one of the work pieces (1, 3). According to the inventive method, a round welding can be advantageously produced when two tubes are welded, whereby no outlet hole (60) remains where the friction arbour (23) is withdrawn from the work pieces at the end of the welding. The invention also relates to a device (62) comprising a control device (64). The friction arbour (23) can be removed from the work piece (1, 3) in a controlled manner and by means of said device (62), whereby a feed motion (41) of the friction arbour (23) can be carried out simultaneously.

Dieter Dipl Ing Pellkofer

Papers

Method and apparatus for welding two work pieces

Burner for wig welding

Method for connecting metal parts

Butt welding of tubes - using alignment device which remote controlled moves tubes with respect to each other in X, Y and Z direction

Method and device for welding two work pieces