Rolled - flash welded
IBF France realizes crowns and rolled reins welded by étincelage. This technique allows us from a dish flame-cutting or flattened, warmed in heart in our ovens, to arch in the shape of crown, then to weld by étincelage, without addition of metal.
Before ending piece, operations "of deburring", of "calibration" and of "planage" are necessary, what allows us to guarantee a tolerance of flatness, circularity and ovalisation of the order of 1.5 mm.
What's flash-butt welding ?
The flash-butt welding belongs to the group of the procedures of butt welding. He is made without adding metaland contains two different phases: the heating and the forging.
The energy necessary for the rise in temperature of the zone to be welded is obtained by effect joule due to the passage through the piece, of a low-voltage current and a strong intensity. During this operation, there are bows with ejection and evaporation of the metal melted towards the outside of the joint, it is the beginning of the flashing.
From the end of the flashing, an forging effort is applied, disgusting in the form of smudge the thin layer of liquid which is left to the contact area.
Advantages of the process
- Cost cutting material thanks to needs it very low(weak) surépaisseurs to obtain the manufactured part
- Weld without adding metal (chemical homogeneity)
- Mechanical characteristics in the TAZ (thermically affected zone), and in the welded zone close to basic metal.
- Structure forged in the welded zone (no basaltic facies)
- No solid or gaseous inclusions
- Very short delay of manufacturing (2 weeks for raw parts), 3 weeks for manufactured parts