The " tube end beveling " (Welding and Cutting Center) for the " tube-to-tube-head" connection focuses on the precise and repeatable cutting of the " tubes " prior to welding, as well as the efficient removal of welds during repair work.
Cutting to Length as a Core Task
Pipe edge milling machines are used at two key points in the process:
As part of a general welding preparation to cut tubes to the exact desired length before welding them into the tube sheet.
After the expanding, when only rolling is performed: On the first tube sheet side, the tubes are rolled flush using a tube expander with a full cap. On the second side, material displacement during the rolling process creates a tube protrusion. This protrusion must be milled back according to the expanding to achieve a dimensionally accurate, flush tube end.
tube end beveling for repairs and retubing
The beveling is also indispensable for repair work: Before removing old tubes, the existing weld must first be milled away. With blades set at an angle of 30° or 45°, two steps can be performed in a single pass: removing the weld and, at the same time, preparing the tube sheet for rewelding after the vessel has been re-tubed.
What Matters When Choosing a Milling Machine
With the tube end beveling , speed and precision are equally important. A pneumatic clamping unit enables fast operation while ensuring centric alignment in the tube —a prerequisite for dimensionally accurate results.
Since requirements vary depending on the task, the number of cutting tools used should be flexible. The pipe edge milling machines from TECHNODATA operate with up to four cutters simultaneously—for internal and external machining as well as facing—all in a single operation.
For tasks involving a high number of repetitions, lever-operated feed is also advantageous: it speeds up the work and ensures ergonomic, fatigue-free operation. A spacer further ensures the precise beveling of each individual pipe— tube for tube with the same result.
The tube beveling machine Mini-TDA covers the tube ID range from 12.5 to 42.0 mm and is suitable for large-volume heat exchanger work. For thick-walled tubes in boiler construction, the tube beveling machine , Type Kessel, is available with a range of 28.0 to 76.0 mm.