Types of welded joints
In welding, tee joints are used to weld two plates or sections with surfaces located approximately 90 degrees to each other at the joint, but the surface of one plate or section is not in the same plane as the end of the other surface. The included angle of bevel in the preparation of tee joints is approximately half that required for butt joints.
When welding tee joints , care must be taken to insure penetration into the root of the weld. This penetration is promoted by root openings between the ends of the vertical members and the horizontal surfaces.