True or False: Steel from 1/4 inch to 1/2 inch thick may be butt welded with no edge preparation.

True or False: Steel from 1/4 inch to 1/2 inch thick may be butt welded with no edge preparation.

• A. True
• B. False
• C. Not enough information
• D. Depends on joint design

Answer: (B)

Edge preparation is needed for butt welds on steel in the 1/4 to 1/2 inch range to allow proper root fusion and penetration. When plates of that thickness are welded with flat, square edges, there isn’t enough edge geometry for the root to fuse fully in a single weld pass. Beveling the edges creates a groove and root opening, so the weld metal can reach the root and achieve complete penetration and sound fusion. Without edge prep, the joint is prone to lack of fusion, porosity, and weak strength at the root. Therefore, you typically cannot butt weld 1/4 to 1/2 inch thick steel with no edge preparation.

Edge preparation is needed for butt welds on steel in the 1/4 to 1/2 inch range to allow proper root fusion and penetration. When plates of that thickness are welded with flat, square edges, there isn’t enough edge geometry for the root to fuse fully in a single weld pass. Beveling the edges creates a groove and root opening, so the weld metal can reach the root and achieve complete penetration and sound fusion. Without edge prep, the joint is prone to lack of fusion, porosity, and weak strength at the root. Therefore, you typically cannot butt weld 1/4 to 1/2 inch thick steel with no edge preparation.