Anglicky v odborných předmětech "Support of teaching technical subjects in English “

1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering technology Topic: Acetylene-oxygen flame Prepared by : Ing. Josef Martinák st. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

2. Acetylene – oxygen flame Flame temperature Burner nozzle Aerial oxygen weldment Taper of acetylene-oxygen flame Flame casing Welding zone 2 to 4 mm highest temperature 1st 2nd Stage of combustion

3. Acetylene is mixed with oxygen in ratio 1:1 • 1st burning – acetylene burns in air ( flame casing) • Welding zone from 2 to 4 mm –acetylene flame temperature is 3200°C, hydrogen 3300°C

4. Chart: colours and fitting threads to pressure bottles Gas type fitting bottle thread flammable acetylene fastening shackle Light brown White/yellow strip hydrogen red red left oxygen white blue inflammable nitrogen black green left Carbon dioxide grey black argon Dark green helium brown air Light green grey Inner Colour at pressure bottles is not normalised

5. Rules for manipulation with pressure gaseous bottles • Input fitting – oxygen bottles must be dry without oil • Oxygen reacts with lubricants and oils explosively • Gaseous bottles must be stored safely, they must be protected against shocks, overheating and frost • Reduction valves must be unscrewed from pressure bottles when they are transported • Protective hoods must be fit on inputs

6. Preparation of welding surfaces Weld by border weld • Parts to clean and aligned • Adjust thickness of welded parts • We reach perfect welding weld weld Welds by corner Weld by angle

7. Plates´ tack-weld before welding Welding material

8. Weld description Weld d Welding material Welding surface Penetration depth Weld face Basic material Basic material Weld root Transient area Weld underside

9. Leftward welding • Welding rod moves in front of burner • Require lower skill demands on welders • Usage for plates of thickness up to 4 mm, cast iron, copper, brass • Weld is not protected perfectly • It has lower mechanical qualities Leftward welding (until 3 mm) Without protection without protection Welding rot burner Welding rot burner Leftward welding to 3 mm

10. Rightward welding • Burner moves towards welding, welding rod follows it • Flame protects molten pool against air input and quick cooling • For welding of plates over 4 mm • Weld has better mechanical qualities Rightward welding (over 4 mm) protection protection Welding rot burner Welding of weld rot Rightward welding (over 3 mm)

11. Questions and revision • What purpose does reduction valve have? • What are the main components of reduction valve? • Explain ways if welding direction!

12. Literature • DILLINGER, Josef. A KOL. Moderní strojírenství pro školu i praxi. 1. Praha: Europa-Sobotáles, 2007. ISBN 978-80-86706-19-1. • M. HLUCHÝ, J. KOLOUCH, R. PAŇÁK. Strojírenská technologie II • FRISCHHERZ, Adolf, Paul SKOP a Jiří KŇOUREK. Technologie zpracování kovů 1. Praha: Wahlberg, 1993. ISBN 80-901657-2-9. Translation: • www.seznam.cz • www.slovnik.cz • JANATA, Petr. Handy slovník technický anglicko-český a česko-anglický. Plzeň: Nakladatelství Fraus, 2000. ISBN 80-7238-075-3 • Lingea LEXIKON 5, Technický slovník anglicko-český a česko-anglický. 2010.