Tutorial: Engineering technology Topic: Resistance welding Prepared by: Ing. Josef Martinák st. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/ je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Plates are pressed by copper electrodes At the projected spot is heat welded
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
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 Amperes is used
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
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
Explain welding procedure: ◦ Pressure butt welding ◦ Pressure butt welding with flashing ◦ Seam welding
DILLINGER, Josef. A KOL. Moderní strojírenství pro školu i praxi. 1. Praha: Europa- Sobotáles, ISBN M. HLUCHÝ, J. KOLOUCH, R. PAŇÁK. Strojírenská technologie II