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A friction welded joint structure includes friction welded dissimilar first and second metallic materials. The first metallic material has a rigidity greater than the second metallic material. The angle of the first metallic material to a free edge of the first metallic material, at an end portion o

A friction welded joint structure includes friction welded dissimilar first and second metallic materials. The first metallic material has a rigidity greater than the second metallic material. The angle of the first metallic material to a free edge of the first metallic material, at an end portion of a joined surface between the first and second metallic materials, is greater than or equal to 120 degrees or in the range of from 55 degrees to 85 degrees. A reaction layer between the first and second metallic materials is more than zero and less than or equal to 20 μm. The first metallic material is copper. The second, which has the smaller rigidity, is aluminum.

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A friction welded joint structure includes friction welded dissimilar first and second metallic materials. The first metallic material has a rigidity greater than the second metallic material. The angle of the first metallic material to a free edge of the first metallic material, at an end portion o

A friction welded joint structure includes friction welded dissimilar first and second metallic materials. The first metallic material has a rigidity greater than the second metallic material. The angle of the first metallic material to a free edge of the first metallic material, at an end portion of a joined surface between the first and second metallic materials, is greater than or equal to 120 degrees or in the range of from 55 degrees to 85 degrees. A reaction layer between the first and second metallic materials is more than zero and less than or equal to 20 μm. The first metallic material is copper. The second, which has the smaller rigidity, is aluminum. ted by the first supporting means and the pressing surface of the platen supported by the second supporting means whereby to apply pressure to the surface of the belt or belts defining the first and second free end of the belt or belts. 2. A jointing press as claimed in claim 1 wherein the heating element is adapted to heat within the edges of the contact coating. 3. A jointing press as claimed in claim 1 wherein each of the first and second supporting means adopts a box-like configuration for housing the body of the platen in such a manner as to expose the pressing surface thereof. 4. A jointing press as claimed in claim 3 wherein each of the first and second supporting means houses a foam or sponge-like material. 5. A jointing press as claimed in claim 1 wherein each of the first and second supporting means is a carbon fibre shell. 6. A jointing press as claimed in claim 1 wherein the heating element is substantially thermally insulated from said pressing surface by an insulating filler. 7. A jointing press as claimed in claim 6 wherein the insulating filler is a rigid silicon glass sheet. 8. A jointing press as claimed in claim 1 wherein the urging means is pneumatically driven. 9. A jointing press as claimed in claim 8 wherein the urging means comprises: an inflatable body supported in the first supporting means to the rear of the pressing surface of the platen. 10. A jointing press as claimed in claim 9 wherein the urging means comprises: a first inflatable body supported in the first supporting means to the rear of the pressing surface of the platen and a second inflatable body supported in the second supporting means to the rear of the pressing surface of the platen. 11. A jointing press as claimed in claim 1 wherein to the first supporting means is secured one or two supporting lips for bearing at least part of the surface of the belt or belts defining the first and second free end of the belt or belts. 12. A jointing press as claimed in claim 11 wherein the supporting lip or lips extends along a face of the first supporting means substantially coplanar with the contact coating. 13. A jointing press as claimed in claim 1 wherein in use the first supporting means and second supporting means are stacked with the contact coating applied to the heating element of the first supporting means facing the contact coating applied to the heating element of the second supporting means and with the surface of a belt or belts defining the first and second free end of the belt or belts therebetween. 14. A jointing press as claimed in claim 13 wherein the first supporting means and second supporting means are adapted to be interlockably stacked. 15. A jointing press as claimed in claim 13 wherein each end of the first supporting means comprises an end profile capable of mating with an end profile on each end of the second supporting means to withstand relative axial and transverse movement of the first and second supporting means. 16. A jointing press as claimed in claim 1 wherein one or more clamping devices are mounted on the first and second supporting means to withstand any tendency for the contact coatings to diverge. 17. A jointing press as claimed in claim 16 wherein the clamping device or devices comprises a locking element pivotably mounted on the first supporting means capable of pivotally engaging a retaining member on the second supporting means. 18. A jointing press as claimed in claim 17 wherein the locking element comprises two upstanding arms secured in substantially parallel spaced apart relationship by a cross member, wherein the cross member is adapted to pivotally engage the retaining member. 19. A jointing press as claimed in claim 17 wherein the retaining member is an upstanding flange on the surface of the second supporting means incorporating a receiving channel engageable with the cross member. 20. A jointing press as claimed in claim 1 wherein the contact coating is composed at least partially of polytetraf