Final answer:
The groove angle is the total opening angle between two pieces to be welded, while the bevel angle is the preparation angle on an individual piece. The angle of penetration refers to how the welding beam enters the material, and fusion angle concerns the melting of base metal during welding.
Step-by-step explanation:
The difference between a groove angle and a bevel angle pertains to welding and fabrication. The groove angle is the total angle formed between the prepared edges of two pieces to be welded. The bevel angle, on the other hand, is the angle of the edge preparation of one individual part; essentially it is half of the groove angle when two parts are symmetrical. The terms given, such as angle of penetration, angle of preparation, welding speed angle, and fusion angle are related but distinct aspects of welding technique. Specifically, the angle of penetration refers to the angle at which a welding beam or rod enters the material, the angle of preparation is a term often synonymous with bevel angle, welding speed angle does not refer to an angle itself but to the rate at which welding progresses along a seam, and the fusion angle is the angle at which the base metal melts to create a weld.