The authors have been investigated the characteristics of the spot-welds of the titanium produced in Japan, and clarified the influence of welding condition on weld strength, penetration, indentation, weld-diameter, hardness and structure of welds. The authors have obtained the following conclusions.
1. Spot-welds of commercial pure titanium have fairly strength and ductility.
2. It is easily obtainable the T/S ratio of 0.35.
3. Weld strength is increased with increase of welding current and time, but it is rather decreased with too much welding current and time.
4. Weld-characteristics is little affected with tip pressure.
5. Indentation, penetration and weld-diameter are increased with increase of welding current and time, but the influence of welding time on them is less than that of welding current.
6. The specimen cleaned by CCl4 indicates the best result in welds in comparison with other surface treatments.
7. Failure of all specimens occured in the type of bottom and plug failure.
8. Hardness and structure in welds are little affected by the change of welding current and time, and hardness in welds is as same as annealed condition of parent metal. Structure is dendritic or columnar and grain growth takes. place with increase of welding current and time.
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