Slide 2 Tutorial: Engineering technology Topic: Flame welding
Prepared by : Ing. Josef Martink st. Projekt Anglicky v odbornch
pedmtech, CZ.1.07/1.3.09/04.0002 je spolufinancovn Evropskm socilnm
fondem a sttnm rozpotem esk republiky. Slide 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 (R) Gas
inputs Pressure bottles Valves against backward flashing Labeling N
new colorful labeling in SRN valid from 1st July 2006 Slide 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 Slide 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 Slide 6
White painting Reduction valve Porous mass aceto ne 2 Acetylene
bottle Slide 7 Inside gauge Bottle cap Safety valve Pressure bottle
Regulation pressure bolt To burner Gas shut-off Outside gauge Slide
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 335C 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 Slide 9 Low-pressure (injector) High-pressure (mixing)
injectoroxygen acetylene Mixing chamber oxygen acetylene Slide 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 Slide 11 Weld is brittle and
hard Aluminium, cast iron and magnesium welding Acetylene surplus
Slide 12 Suitable for brass welding, some kinds of bronze, for
surface steel hardening by flame Bluish shortened welding cone
Slide 13 What materials do we weld using neutral flame? Slide 14
DILLINGER, Josef. A KOL. Modern strojrenstv pro kolu i praxi. 1.
Praha: Europa- Sobotles, 2007. ISBN 978-80-86706-19-1. M. HLUCH, J.
KOLOUCH, R. PAK. Strojrensk technologie II Translation:
www.seznam.cz www.seznam.cz www.slovnik.cz www.slovnik.cz JANATA,
Petr. Handy slovnk technick anglicko-esk a esko-anglick. Plze:
Nakladatelstv Fraus, 2000. ISBN 80-7238-075-3 Lingea LEXIKON 5,
Technick slovnk anglicko-esk a esko-anglick. 2010.
