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This paper deals with the effect of longitudinal vibration on the mechanical properties of mild steel weldments. The weldments were prepared under different frequencies and amplitudes of vibration. Experiment was carried out in the frequency and amplitude ranges of 0-400 Hz and 0-40 μm respectively. It is found that yield strength, ultimate tensile strength and hardness improves for mild steel specimens welded under vibratory conditions. It is further observed that this improvement in the mechanical properties is appreciable up to 30 μm amplitude.

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Background: The clinical and radiological assessment of biplanar (two coronal and one sagittal) and uniplanar (only two coronal) distal locking screw in tibia interlocking nailing. Materials and Methods: Fifty-one patients who had tibial shaft treated with intramedullary nailing were included in this study. Out of 51, 26 fractures were treated with uniplanar two distal interlocking (Group 1) and 25 fractures were treated with biplanar three distal interlocking (Group 2). Patients with closed fractures shaft of tibia treated by closed nailing were included. Fracture unions were evaluated clinically and radiologically. Results: Union time was shorter in biplanar (two coronal and one sagittal) distal interlocking group (Group 2) compared to uniplanar (only two coronal) distal interlocking group (Group 1). Mean union time in Groups 1 and 2 were 9.34 and 5.16 months, respectively. Conclusion: Biplanar (two coronal and one sagittal) distal interlocking procedure had a significantly shorter union time. Clinically, an average of 5–10' of external rotation of the leg was observed in Group 1, whereas 0–3' of external rotation of the leg was observed in Group 2 patients. Biplanar distal interlocking had more fracture union, probably because of a more stable fixation.