Final answer:
The most common degree of bevel for butt welding on pipes is 37.5 degrees, which allows for proper penetration and fusion during welding to create strong, reliable joints.
Step-by-step explanation:
The most common degree of bevel on a pipe to be butt welded is typically 37.5 degrees. This angle facilitates the proper gap between the two pieces being joined, allowing for correct penetration and fusion of the metals during the welding process.
It is a standardized angle that provides the necessary v-groove for most pipe thicknesses when preparing to weld. The correct bevel angle is critical for creating strong, reliable welds that can withstand the pressures and stresses that pipes are typically subject to.