References
- Patskevich , I P and Tyvonchuk , P A . 1976 . ‘Using natural gas as the shielding medium in arc surfacing.’ . Avt Svarka , : 65 – 67 . (10)
- Tyvonchuk , P A and Naumenko , V A . 1985 . ‘A gas-electric torch for arc deposition of external cylindrical surfaces of steel and cast iron components in natural gas.’ Information letter No. 47, Kiev