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Four-mm-thick CuSn6 tin bronze plates were friction stir welded at a constant tool traverse speed of 100 mm min−1. Favorable joints could be obtained with rotation speeds ranging from 600 to 1000 rev min−1, and groove was found on the surface of the joint under 400 rev min−1. The microstructure of the weld nugget zone was characterized by equiaxed recrystallized grains with heterogeneity along the...