Producing savings in cost, weight, lead time, size and inventory.
EBW is a machine controlled process, with welding carried out in a vacuum with no filler material, resulting in exceptional weld quality and repeatability.
Weld speeds are typically 1-2 metres/min and result in deep, narrow welds requiring less than 5% of the heat input needed for a comparable depth TIG weld.
Distortion low enough to weld finish ground gears
See a range of industrial applications in https://www.ebpglobal.com/how-is-eb-welding-used-in-industry/
Click below to see a short video explaining how the process works.
What is the difference between EB & Arc welding?
Arc welding melts metal by applying heat via an arc or plasma faster than it can conduct away until a molten pool is achieved. On thin materials, <2.0mm, the heat source is moved along the joint leaving the melted metal to fuse to. For thicker materials, a “vee” 90° is needed to add filler metal, which is added to the molten pool to fill the “vee”.
This is a slow process, with weld speeds of 20-30mm/min, and applies a lot of heat to the top surface, resulting in distortion as the welded metal cools and shrinks.
E B welding uses a focused beam of electrons, which can focus 4KW into a spot of 0.5mm diameter. This instantly melts the metal to a vapour hole surrounded by liquid. Deep welds can be produced at high speeds.
Total heat input for EB welding is less than 5% of that required by Arc welding, resulting in minimal distortion.
Is EB welding equipment expensive and if so how does it compete with conventional welding?
EB equipment is expensive; £300,000 to £2,000,000 is typical, subject to the size of machine. There are many areas where the advantages justify the cost.
What is the difference between EB and Laser welding?
Both high energy density processes. EB welding produces the deepest high-quality welds, but the size of the vacuum chamber limits the size of assemblies and evacuation slows of speed of overall weld cycle time.
Laser uses highly focused light does not need a vacuum, but still needs controlled atmosphere to weld high strength materials. It is very successful for low power, high speed welds for electronic and thin metal joining, where fibre optics can be used to deliver the light source.