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Laser & Electron Beam Welding of Capillary Tubes

From Electron Beam Engineering, Inc.
 

 

When welding capillary tubes it is preferable to weld on the end of the tube, which is normally flush or slightly protruding from the parent. This technique avoids the possibility of the beam penetrating the wall of the tube and is used extensively in the manufacture of mass flow devices which pass gas through a capillary 'U' tube. (See Figure 1)

The welding of a tube where it passes through a parent is also possible, but requires even closer control of fit and beam position and power. One method for joint preparation is to form the parent into a tapered knife edge (Fig. 2) and use the "roll over" technique to avoid putting the beam directly onto the thin walled tube.

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