| The influence of the surface roughness of the sheet billets on quality of the solid state joining under low temperature superplasticity conditions was investigated. The obtained results show that the smallest relative long range area of pores in the zone of joining achieved after polishing of the joined surfaces. The largest pores extension is observed after cleaning by a metallic brush. Vacuum annealing of the solid state joined samples out of titanium alloy VT6 at temperature 750 °C does not eliminate porosity and negative influence on mechanical properties. |
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