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DOM Tube Making Process Overview

Below is a general description of Webco's DOM tube-making process. Inquire for more detail on Webco's extensive engineering, customization, testing, and quality-control capabilities.

Process
Description of Manufacturing and Testing Process
Raw Material:
Tube Hollow

 Hollow tubes for DOM (Drawn Over Mandrel) products are made in-house by the weld mill department ensuring that the hollows meet Webco's high quality standards.
Lubrication

 All tubes are treated with drawing lubricant and the condition of the lubricant is closely monitored.  
Pointing

 One end of each tube is pointed (or swaged) to proper size.
Cold Drawing
Or
Cold Drawing(s)
Process Anneal
Cold Drawing(s)

 The tubes are pulled over the mandrel and through the die to create to the customer's specified design size. This process, called cold drawing, may be repeated more than once to reach the planned OD, ID, or wall dimension. Multiple draws can also be used to increase the strength or improve the surface finish of the tubes. During the drawing operation, the tubes may be process annealed to increase the ductility of the material.
Heat Treatment

 Unless finished to "as drawn" condition, the tubes are stress relief annealed or normalized in a controlled atmosphere continuous furnace.
Straightening

 The tubes are straightened to meet the customer's application requirements.
NDE Testing

 All tubes are inspected to either an industrial test specification or to special customer testing requirements with non-destructive electric test methods.
 
Length Cut and Ends Finish

 The tubes are cut to the finished length and the ends are finished by a de-burring or OD/ID chamfering process. If required, the tubes are stenciled with specified information. All tubes are bundled in hex shape with proper lot identification tags.
 
Inspection and Testing
 The final dimensions are inspected and verified. Destructive tests (if required) are performed. If any mechanical property or other special testing is required, a proper sample will be collected for further testing at the metallurgical testing lab.