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Two high-temperature pin tools, one a polycrystalline cubic BN and the other of W-25%Re, were used to friction stir weld 12.7 mm thick Invar (Fe-36%Ni) plate. Successful welds were produced at a rotational speed of 600 rev min−1 and travel speeds of 76, 102, and 127 mm min−1. The coefficient of thermal expansion, tensile strength, and microhardness of the welds were measured and found to be essentially...
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