Tips for Putting the Root Pass in a 3-inch Pipe:1. Ensure the landing is not too thick: When performing the root pass, having a landing that is too thick can cause an incomplete penetration (IP) in the weld joint. It is important to have a proper thickness in order to achieve a strong and fully fused weld.2. Properly grind tacks: Before starting the root pass, grind the tacks on both the top and bottom until they have a blue color at the ends. This will ensure proper fusion and a strong weld. Gr