Welding and additive manufacturing of titanium and other sensitive materials are particularly problematic due to their high oxygen affinity. The melting pool has to be protected from oxidation not only during the welding proces but also after its crystallization up to about 300 Celsius degrees. In order to protect titanium-melting pool during and after the welding, pure inert gases such as argon or helium with purity 99.999% should be used. The present study describes the procedure and basic principles for additive manufacturing of Ti. In order to improve the protection of the melting pool, the small chamber with low overpressure was developed in house and it was used to reduce the oxygen content in the welding area due to argon filling. Based on preliminary tests, some basic parts of titanium gr. 1. were welded by PTA method on plasma hardfacing automate PPC25 R6.Keywords: Pulsed PTA, additive manufacturing, titanium
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