What is the standard progression for welding in structural applications?

The standard progression for welding in structural applications is vertical up. This method is often preferred because it allows for better penetration and fusion of the weld bead into the base material. When welding vertically upward, the welder can control the molten puddle, ensuring that the weld metal adheres properly and fills any gaps or joint configurations effectively.

Additionally, vertical up welding is advantageous in creating stronger welds that are less prone to defects such as undercut, which can occur more readily in downward welding positions. The vertical up technique also helps to promote the flow of slag and molten metal, which can contribute to a more uniform and robust joint.

While the other options may have specific uses or advantages in certain situations, vertical up is generally recognized as the standard progression for optimum strength and integrity in structural welding applications.