MACHINE UL-178M
FOR EBW OF TUBES TO THE TUBE SHEETS
OF HEAT EXCHANGERS

Macrosection of the welded joint
cross-section, Ti-alloy, tube
Ø 7,85x1,5 mm, depth of weld
≥ 4,5 mm

• Special-purpose machine for EBW of heat exchangers
• CNC+PLC of all machine systems
• Low level of hydrocarbons in a vacuum chamber due to liquid nitrogen cooled baffle
• Switch mode of high voltage power supply
• Secondary electron emission RASTR system for seam tracking and observation

  APPLICATION PROCEDURE

Sequence of unit operation:

• a program is selected from the control computer memory, which corresponds to a specified = certain heat exchanger to be welded. This program assigns, according to the heat exchanger drawing, the position of each tube and sequence of tube welding;
  
• alignment of each tube axis with the welding gun axis is performed, using X-Y table, on which the heat exchanger is fixed;
  
• alignment accuracy is controlled, using a secondary electron emission system RASTR and, if required, is corrected by the electromagnetic deflecting system;
  
• this is followed by welding by a beam of electrons, scanned by a program around the tube circumference.
  

  MACHINE DESIGN

The work chamber has one sliding door. X-Y-axis workpiece manipulator is moved out of the work chamber onto the runout platform, where the heat exchanger is assembling for welding

  TECHNICAL DATA