Flash-welding

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IBF manufactures flash-welded rings and flanges. With this technical method, a thermally cut or rolled plate piece is heated in our furnace, bended on a roller then flash welded without a filler material.

Before working on the raw material, deburring, sizing and levelling operations are necessary, which enables us to ensure a tolerance of flatness, circularity and ovalization on our raw pieces of 1.5 mm.

What is flash welding ?

Flash welding belongs to the group of butt welding procedures. It is carried out without filler material and consists in two phases : heating and forging.

The necessary energy for the rise in temperature of the zone to be welded is obtained by Joule effect due to the passage through the piece of a low-voltage and strong intensity current. During this operation, there are bows with ejection and evaporation of the melted metal towards the outside of the joint, it is the beginning of the flash welding.

As soon as the flash welding ends, a deburing action is applied, pushing in the form of burr the thin layer of liquid which is left on the contact area.

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Advantages of the process

  • Reduction of material costs thanks to very low needs of excess thickness to obtain the manufactured part.
  • Welding without filler material (chemical homogeneity)
  • The mechanical characteristics in the TAZ (thermically affected zone) and in the welded zone are very close to the basic metal
  • Forged structure 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)