2. Tutorial: Engineering technology Topic: Flame welding 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.

3. oxygenMixing jet Flammable gasPressure jet Burner nozzleweldment Welding wire Cap-NutOxygen valve handle Acetylene valve Mixing pipe Fitting with valves Reduction valve Identifying oxygen colors – white and blue Colourful acetylene labelling – chesnut brown (SRN), white (ČR) Gas inputs Pressure bottles Valves against backward flashing Labeling N – new colorful labeling in SRN valid from 1st July 2006

4.  Oxygen O 2 – without colour, taste, smell, non-toxic, encourages burning  Acetylene C 2 H 2 – flammable, high heating value, it explodes with oxygen  Hydrogen H 2 – colourless, nontoxic, it makes explosive mixture with oxygen  Propane, butane – nontoxic, it makes explosive mixture with air and oxygen

5. gas Bottle neck bottle Cone of hard rubber Bottom spindle Valve unit Fibre ring Upper spindle Manual wheel Upper spindle nutspring Valve nut Sleeve top Fibre fitting Connection to reduction valve Socket ring

6. White painting Reduction valve Porous mass aceto ne 2 Acetylene bottle

7. Inside gauge Bottle cap Safety valve Pressure bottle Regulation pressure bolt To burner Gas shut-off Outside gauge

8.  Oxygen pressure – we set it at closed valve  Working pressure for welding is 0,3 – 0,4 MPa  Acetylene pressure – we set it at closed burner valve – probably 30 – 40 kPa  Working pressure can not be increased over 0,15 MPa  Ignition temperature is about 335°C  Safety valve – protects reduction valve against high pressure  Protection against burning – there is net of copper wire between bottle valve and reduction valve, it must be near oxygen For oxygen For acetylene

9.  Low-pressure (injector)  High-pressure (mixing) injectoroxygen acetylene Mixing chamber oxygen acetylene

10.  Neutral flame – ratio of oxygen to acetylene is 1:1  Welding cone is white, usage – steel, copper, zinc, lead, some kinds of bronze Welding cone Welding material nosepipe

11.  Weld is brittle and hard  Aluminium, cast iron and magnesium welding Acetylene surplus

12.  Suitable for brass welding, some kinds of bronze, for surface steel hardening by flame Bluish shortened welding cone

13.  What materials do we weld using neutral flame?

14.  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 Translation:  www.seznam.cz www.seznam.cz  www.slovnik.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.