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Backing

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Backing is a material or device placed against the back side of the joint, or at both sides of a weld in electroslag and electrogas welding, to support and retain molten metal. The material may be partially fused or remain unfused during welding and may be metal or non-metal. [1]

References

  1. http://www.bocindustrial.co.uk/bocindustrial/technical/glossary/a.asp
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