2. Tutorial: Engineering technology Topic: Welding with MAG system 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. Booth instrument Wire is moved by shifting Work place is non movable Universal instrument Wire is moved by shifting Work place is mobile

7. Apparatus with small coil Wire is moved by pulling Longer distances Type Push-Pull Wire move is by push & pull Longer distances

9.  Drives coil with wire. For a smooth course of welding process a constant and continuous speed of wire feeding is important. As a feed drive are used DC derivation drives, drives with permanent magnets or high quality motors with disc rotor. These have a very long service life.

10.  depth of penetration medium  width of weld medium  welding direction to the left  flat penetration  wide weld  Welding direction to the left  Deep penetration  narrow weld  Weld direction to the left PerpendicularPushed Pulled

11.  Protects melted medium again surrounded air  Influence shape of weld  Protective gases are tasteless, colorless, odorless  Protective gasses are poisonless

12.  Fault:  Draft (especially at construction sites) influences protective gas coverage  Result:  Insufficient gas protection creates weld air bubbles

13. Too small angle of opening – correct value is 40 o to 60 o Too blunt edge - big edge offset Too big edge overlap Welding on cambered bottom layer Correct procedure: Grinding off bottom layer before welding

14.  Name Welding machines arrangements

15.  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