BOOK_CONTENT
From Metallurgy and Mechanics of Welding: Processes and Industrial Applications

Welding processes using high density energy beams result from the application, in the second half of the 20 th century, of work conducted by physicists in the fields of x-rays and vacuum techniques for the process of electron beam welding and optronics for laser beam welding. The possibility of concentrating these beams on points having a very small surface area led engineers to use this property to melt materials to achieve welds or cuts.

Compared to traditional arc welding processes, these two processes are characterized by a very high energy density at the impact point on the work piece. Rykaline [RYK 74] gave a representation comparing for several processes the heat flows at the center of the heat sources and the diameters of these sources. We can observe that the energy density measured at the focal point of a laser beam or an electron beam is 10,000 times higher than that reached in an oxy-fuel flame (see Figure 2.1).


Figure 2.1: Rykaline's diagram

2.1 Welding Properties Using High Density Energy Beams

These result from the dimension of the focal points (lower than a millimeter in general) used at the level of the parts to be welded. These properties are as follows:

  • single pass welding;

    [1]

  • welding without filler material when there is no gap between the parts to be joined;

  • welding of thin parts (tenths of millimeters) by heat conduction;

  • welding of very thick parts (tenths of millimeters) by the formation of a vapor capillary.

Copyright ISTE Ltd. 2008 under license agreement with Books24x7

Products & Services
Electron Beam Processing Equipment
Electron beam machines, equipment or systems are used to process materials using a very focused energy source with a very small wavelength.
Laser Welding Services
Laser welding services use high-powered laser welding equipment to fuse materials together.
Electron Beam Welding Services
Electron beam welding services use a narrow beam with high energy density to weld metals and alloys with a narrower heat effect zone and deeper penetration compared to most other welding processes.
Welding and Fabrication Services
Welding and fabrication services provide customized metal forming and processing, typically on a contract basis. Capabilities are usually not limited to welding and fabrication, and may include design consulting, on-site operations, prototyping, and other useful industrial procedures.
Ion Beam Guns and Electron Beam Guns
Ion beam guns and electron beam guns produce beams of electrons, ions or other particles for use in chemical and surface analysis, particle physics, resin curing or semiconductor manufacturing.

Topics of Interest

2.2 Laser Beam Welding 2.2.1 History Einstein surely did not suspect the technological revolution to which his stimulated emission theory, established in 1917, would give rise. The technological...

Electron beam welding uses an electron beam to fuse the work piece. Electron beams provide an extremely narrow, concentrated energy source that melts a narrow regions resulting in a minimal heat...

2.4 Metallurgy of High Density Energy Beam Welding The principal features of high density energy density beam welding processes compared to conventional welding processes (arc welding) are: the...

2.10 Development Prospects The two processes are often presented in opposition. This does not appear realistic, each process having specific advantages which will make it better adapted to a...

25.1 Nylon General 25.1.1 General EMS-Chemie: Grilon, Grivory Very good weld joints can be obtained for shaped parts made of Grilon and Grivory using heated element welding, ultrasonic welding,...