2. Tutorial: Engineering technology Topic: Resistance 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.

6.  Plates are pressed by copper electrodes  At the projected spot is heat welded

7.  Plates are welded in successive steps by seam welding  Plates are pressed together by rollers  Pulsing welding current creates dense overlapped spot welds creating a continuous weld

8.  Joint place is heated to required temperature  Pressure is applied to the place of joint  Electric current passes through welded material  Welding does not use additional material  Alternating single faze current of 1 to 20 Volts and up to 100 000 Amperes is used

9.  Friction welding creates a heat in the place of weld  Rotary friction welding  Welded are bolt’s heads, steel tubes  To a non-moving part is pressed rotating part  After achieving welding temperature rotating is stopped and pressing force is increased  When weld is cooled down, collar is removed

10.  Parts are clamped in jaws  Slightly pressed against each other  After switching on of electric current an electric arc is created  At the place of contact parts are melted  When the current switched off, parts are pressed together  Welding edge is created  This method is appropriate for steels with high carbon content

11.  Explain welding procedure: ◦ Pressure butt welding ◦ Pressure butt welding with flashing ◦ Seam welding

12.  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