Copper Back Up Clamp

Engineered to meet various pipeline welding applications and diameters


The CRC Evans copper back up clamp (CBUC) is designed to meet a variety of welding applications using GMAW/PGMAW automatic welding equipment. The CBUC functions as an internal pipe line-up clamp to support external root bead weld deposition with a copper backing surface and can deposit consistent, high quality external root beads with normal pipe alignment.

Segmented and spring-loaded copper backing shoes, or solid copper tile configurations are available depending upon application, and copper tiles allow backing shoes to individually conform to the internal pipe diameters. Segmented systems are suitable for projects with multiple pipe sizes, heavy wall and thin wall variations, or extreme tolerance deviations. Consistent root bead supports common variations in production pipe tolerances including wall thickness, roundness, diameter, and joint fit up.

Solid copper tiles machined to fit specific pipe diameters are strict on dimensional variations. Robust, long lasting and offering mechanical simplicity, they are suitable for projects demanding many welds on a single pipe diameter.

Specialist CBUCs are available for J-lay, tie-in, and purge applications.

  • Consistent external root deposition
  • High quality external root welds
  • Mainline, offshore J-lay, tie-in, and purge configurations
  • Custom applications available

  • Internal pipe line up

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Our equipment is designed, tested and continuously upgraded in-house to provide optimal efficiency