What do you call a weld in the groove formed between a joint member with a curved surface and another with a planar surface?

The term used to describe a weld in the groove formed between a joint member that has a curved surface and another that is flat or planar is known as a flair-bevel-groove weld. This type of weld is specifically designed to accommodate the geometry of the joint, where one member has a curvature that needs to be connected to a flat surface, allowing for effective fusion of the materials, which is crucial for ensuring strong structural integrity.

The flair-bevel-groove weld is particularly useful in scenarios such as piping systems, where the connection between curved pipe elbows and straight sections is needed. It is essential for providing coverage on the base material while accommodating the different surface contours, ensuring a sound weld joint.

Other options do not apply as they refer to different welding configurations. For example, a fillet weld is used to join two surfaces at right angles and does not apply to curved-to-flat joints. A socket weld typically relates to the joining of pipes at a right angle, while an edge weld is used to join the edges of two pieces. Hence, the flair-bevel-groove weld is the most accurate classification for the described joint configuration.