Bevelling is the operation for creating a flat angled surface on the end of the pipe. The opening
created by the bevelling operation gives the welder access to the pipe wall’s total thickness, and
enables him to make a uniform weld that will guarantee the assembly’s mechanical continuity. A
root passes made at the base of the bevels, which forms the base for filling the groove angle formed by the two bevels by successive welding passes.
Facing is the term used for the operation to create a land, which consists of making a flat surface on the end of the pipe. Correct facing makes it easier to put the pipes in line with each other before welding and also contributes to having a constant root opening between parts. These are both essential parameters for maintaining a correct welding puddle and for ensuring that the root pass has penetrated the joint completely.
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