Tri-Beam Process

Beamalloy has developed a proprietary electron beam welding process, which we call the TriBeam™ process. TriBeam™ refers to the left side, the right side, and the central area of the electron beam in Beamalloy’s welding equipment. The percent of total energy of the beam is highly controllable in these three general areas. This feature provides Beamalloy with the capability of producing accurate and uniform welds in weldments that would otherwise be difficult or impossible to produce with conventional electron beam welding processes.

Examples of the TriBeam™ Process

This example shows two parts welded that are of the same or similar material with equal thermal conductivities. The width of the TriBeam™ is set to extend beyond the width of the gap. The left and right sides of the beam are set to have equal energies, and the central area is set to have less energy than either the left or the right side. The cross-section photo shows the effects of the TriBeam™ process where the wall of the weld is relatively straight, and the bottom of the weld is relatively flat. The other photos show the as-welded surfaces of cylindrical tubular welds. The TriBeam™ process can also produce acceptable welds when the fit-up is less than perfect, and the joint gap is wider than optimum.

  • Tri-Beam Process
  • Tri-Beam Process

This example is similar to the example above, except the two metals to be joined have different heat conductivities, or they are of different thicknesses. The TriBeam™ is set so as to provide more energy to the side with the higher heat conductivity, or to the side with the greater thickness. Examples include welding non-magnetic materials to magnetic materials, or in welding the edge of a thin bellows to a thicker end piece.

  • Tri-Beam Process bellows
  • Tri-Beam Process bi-metal

This example shows a TriBeam™ face weld of a round plug that is set into a corresponding round hole. This illustrates the ability to weld adjacent to, and below the top surface of a vertical extension beside the plug.

Tri-Beam Process face weld

This example shows a tube fitting welded to a tubular section. In this situation, the TriBeam™ is shaped so as to produce increasing energy toward the thicker cross section of the weldment. The objective of this weld is to produce a welded joint that is as wide as, or wider than the tube wall, without penetrating through the tube wall. In this example, other parameters also must be controlled during the weld to counteract the weldment’s progressive heating effect. This tube wall is .030 inch thick. Beamalloy routinely welds similar weldments with tube walls as thin as 0.015 inch.

  • Tri-Beam Process tube
  • Tri-Beam Process closeup