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

Anglicky v odborných předmětech "Support of teaching technical subjects in English “. Tutorial : Engineering technology Topic : Metal welding – stainless steel, aluminium, zinc coated materials Prepared by: Ing. Josef Martinák st.

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

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  1. Anglicky v odborných předmětech"Support ofteachingtechnicalsubjects in English“ Tutorial: Engineering technology Topic: Metal welding – stainless steel, aluminium, zinc coated materials 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. Metal welding – stainless steel, aluminium, zinc coated materials by MIG, WIG, TIG, CMT methods • Weld is protected against air by inert gas • By argon or helium • We weld – stainless steel, zinc coated materials, aluminium alloys and high-alloyed alloys • MIG method weldment Input bundle Welding torch Bottle with safety gas Reduction valve Weld bead Voltage setting Wire travel speed Current and wire travel switching Control line Safety gas Gas jet Ground terminal Cooling water line Wire line and arc contact Coil with wire Welding wire Current and welding wire line Safety gas Network input weldment Wire travel drive Weld bath Electric arc

  3. Chart: Welding types in protective atmosphere Metal electrode welding in protective atmosphere (melt electrode) Metal electrode(M), active gas (AG), MAG Metal electrode, inert gas, MIG Wolfram electrode welding in protective atmosphere (non-melt electrode) Wolfram electrode, inert gas, WIG Wolfram electrode, plasma, WP Chart: Safety gases and their usage Sign Gas group Chemical composition Usage Reduction gas mixture Inert gases, inert mixtures Slightly oxidant gas mixtures Heavily oxidant gas mixtures

  4. Pictures – stainless steel and aluminium welding

  5. WIG method • Solid non-melting wolfram electrode is used • Safety gas is argon or helium • Inert mixtures argon and helium Safety gas and welding current switches Welding torch Input bundle Gas jet Wolfram electrode Cooling water line Safety gas control weldment Control line Welding wire Ground terminal Welding current Safety gas Arc (2 to 3 mm long)

  6. Direct arc welding – WIG • By negative pole wolfram electrode • Usage – to weld alloyed steels and non ferrous metals ( stainless steel and copper) • Electrode has pointed tip, it enables regular arc, accurate line • Penetration with welding bath is thin and deep Direct welding Wolfram electrode Safety gas arc Electrone flow Usage for Cr-Ni steel and coppet

  7. Changeable arc welding – WIG • Light metal welding – mainly aluminium • Electrons travel from weldment to electrode at positive half-wavelength, they pull out surface oxide particles. It has higher melting point (2500°C) than aluminium (660°C) Changable welding Wolfram electrode Safety gases arc Electrone flow Usage for aluminium alloys

  8. TIG method • At manual torch moving, we move it by right hand which is inclined of 15° right to weld • We move additional material wire by left hand • Arc keeps 2-3mm lenght • We reduce current after welding (danger of hole burning) • We should hold a bracket with flowing air over weld end until getting cold • Electrode is titanium

  9. CMT method • New cold welding process MIG/MAG uses technology of steel and aluminium joining • This joining process is enabled by cold material transition • Additional aluminium material melts with basic aluminium material – liquid alloy wets zinc coated steel basic material

  10. Metal welding of stainless steel • Alloyed elements Cr-Ni steel • Chromium - Cr increases oxidation and corrosive resistance, chromium makes thin chromium oxide coating on steel surface • Nickel - Ni increases strength at higher temperatures • Titanium - Ti decreases IK (intercrystalic corrosion) • Welded metal and basic material should have the same mechanical , chemical and thermic qualities Quality Common constructional steels steel colour Greyish black silvery Thermal conductivity Way of magnetization yes no hardenability yes no Corrosive resistance no yes Electric conductivity

  11. Questions and revision • Where is the difference between MIG/MAG welding method? • When is direct current used at WIG welding ? • When is changeable current used at WIG welding?

  12. Literature • DILLINGER. KOLEKTIV. Moderní strojírenství pro školu i praxi. ISBN 9788086706191. pro konkurenceschopnost, ESF 2007 – 2013. • Metodika svařování – odborný výcvik ve 3. tisíciletí 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.

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