Where should the largest gap of the B pressure weld be placed and when should it be welded?

Where should the largest gap of the B pressure weld be placed and when should it be welded?

• A. In the top quarter, to be welded last
• B. In the bottom quarter, to be welded first
• C. In the middle half, to be welded last
• D. In the top quarter, to be welded first

Answer: (A)

The way you sequence passes and where you place the largest gap directly affects heat distribution, distortion, and fusion in a B pressure weld. Putting the biggest gap in the top quarter and welding it last lets you build up and establish a stable base with the lower portions first. When the lower sections have been welded and begin to cool, the final top pass locks the pieces together, minimizes upward distortion from heat shrinkage, and ensures the top area achieves full fusion. If the largest gap were placed lower or welded earlier, the heat could cause more distortion or incomplete fusion in the remaining passes, leading to a weaker joint.

The way you sequence passes and where you place the largest gap directly affects heat distribution, distortion, and fusion in a B pressure weld. Putting the biggest gap in the top quarter and welding it last lets you build up and establish a stable base with the lower portions first. When the lower sections have been welded and begin to cool, the final top pass locks the pieces together, minimizes upward distortion from heat shrinkage, and ensures the top area achieves full fusion. If the largest gap were placed lower or welded earlier, the heat could cause more distortion or incomplete fusion in the remaining passes, leading to a weaker joint.