Friction welding is a process in which the heat necessary to make a permanent connection comes from the direct conversion of mechanical energy into thermal energy as a result of friction in the area of mutual contact of welded objects.
GENERAL COURSE OF FRICTION WELDING PROCESS:
- driving one of the welded objects up to rotational speed n
- exerting friction pressure Pt by moving the second welded object
- heating the joint by converting kinetic energy into frictional heat
- stopping rotation and exerting upset pressure Ps
The heating process of welded elements is carried out in such a way that the external surfaces are heated first (which facilitates the squeezing of impurities), and then the heat flows inwards, spreading evenly in the area of the front surfaces so that a weld is created.
FRICTION WELDING PARAMETERS:
- rotation speed
- friction pressure
- friction time
- upset pressure
- upset time
THIS METHOD CAN BE WELDED:
- carbon steels
- tool steels
- corrosion resistant steels
- copper
- aluminum
- nickel alloys
- copper alloys
- titanium
- zirconium
- unlike connections
BASIC ADVANTAGES OF FRICTION WELDING:
- high quality of joints, thanks to controlled thermo-mechanical treatment occurring during the welding process
- the ability to combine materials that differ significantly in physical properties
- the possibility of combining objects of different shapes and dimensions; usually only one of the welded objects is limited in length
- high welding efficiency, up to 600 joints / h
- even network load and low energy consumption
- high repeatability of welding results and the ability to control and control quality during the welding cycle
- simple operation of devices and ease of automation
