The disclosure of the invention provides a clamping apparatus and methods for joining segments of pipeline. The clamping apparatus includes first and second clamp assembly portions, each having at least two pivotable arms that clamp on to ends of two pipeline segments, respectively. The apparatus includes bridging members positioned within the gap connecting first and second clamp assembly portions. The bridging member has a central portion between and radially distal to first and second portions. The arrangement of the central portion provides a continuous open area around the circumference at the pipeline junction so a weld can be made with high precision and efficiency.