Spin-welding

Spin welding is used to weld axisymmetric joints. The lower component of the assembly is held stationary in fixtures, while the upper component is both rotated and pressed normally against the fixed component. The upper component typically has clocking features that allow it to be driven by the drive spindle. The simplest way to think about spin welding and indeed the simplest way to accomplish it is to consider a drill press spinning a part which is subsequently pressed down on a stationary part fixed to the press table. Spin welding can not only create hermetic seals, but it can also encapsulate other components within the volume created by the assembly. 

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Spin Welding. Spin welding is an efficient technique for joining circular surfaces of similar materials. The matching surfaces are rotated at high speed relative to each other and then brought into contact. Frictional heat melts the interface and, when motion is stopped, the weld is allowed to soHdify under pressure. 

TPEs can be bonded to other materials by adhesive, heat bonding, electromagnetic filling, radio frequency, heat-sealing lamination, friction and spin welding, and ultrasonic welding. For TPUs, the most widely used techniques are radio frequencies, and ultrasonic and hot stamping. A few typical applications include football bladders, valves, and conveyer belts. 

Spin on glass (SOG) technique, 24 750 Spin-orbit split-off band, in compound semiconductors, 22 148-151 Spinosad, 14 346 Spinplates, rectilinear, 17 470 Spin probe testing, of plastics, 19 589 Spin welding, of ethylene-... 

Fabrication techniques include compaction and sintering, direct compression molding, hot stamping, forging, and hot plate or spin welding (13). 

Welding of ETFE parts can be done easily by spin welding, ultrasonic welding, and conventional butt-welding using flame and ETFE rod. The resins bond readily to untreated metals, but chemical etch corona and flame treatment can be used to increase adhesion further.21... 

FEP parts can be joined by the spin welding technique. Joints can be designed to allow the rotation of one part relative to the other at a fast rate. Heat generated during the rotation melts the FEP at the joint and allows the formation of a weld. FEP requires minimal speed (3,000 rpm) for spin welding. In one example, a joint with better than 60% of the tensile strength of base FEP was obtained,... 

PVDF parts are easily welded using spin welding. Welding data for 25 mm diameter, 1.9 mm thick pipes are as follows ... 

Schaible, S., Cakmak, M., Instrumented Spin Welding of Polyvinylidene Fluoride, ANTEC Conf. Proc., Soc. Plastics Eng. (1992)... 

In friction or spin-welding of thermoplastics, one of the two pieces to be jointed is fixed in the chuck of a modified lathe and rotated at high speed while the other piece is held against it until frictional heat causes the polymer to flow. The chuck is stopped, and the two pieces are allowed to cool under pressure. The process is limited to objects having a circular configuration. Typical examples are dual-colored knobs, molded hemispheres, and injection-molded bottle halves. 

The spin welding method is applicable to circular surfaces which must be bonded. The two pieces to be joined are slightly pressed together while one of the pieces is rapidly rotated. The friction thus generated heats the plastic... 

The shape (cross section) of the surfaces to be joined may also have to be determined in cooperation with the manufacturer of spin welding equipment, and the plastic supplier. 

Friction or Spin Welding. Spin welding uses the heat of friction to cause fusion at the interface. One substrate is rotated very rapidly while in touch with the other stationary substrate so that the surfaces melt without damaging the part. Sufficient pressure is applied during the process to force out excess air bubbles. The rotation is then stopped, and... 

Because of its high weld quality, simplicity, speed, and reproducibdity, spin welding is a popular method of joining large-volume products, packaging, and toys. Common applications are the manufacture of floats, aerosol bottles, and attachment of studs to plastic parts. 

Spin welded ABS joints can have straight 90° mating surfaces, or surface can be angled, molded in a V-shape, or flanged. The most important factor in the quality of the weld is the joint design. The area of the spinning part should be as large as possible, but the difference in linear velocity between the maximum and minimum radii should be as small as feasible. 

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