It is a joint that connects the steel bar with the embedded part vertically. Pre-embedded parts are mostly steel plate, is the image of steel plate and rebar is connected vertically is T-shaped, so called T-shaped joints.
T-shape joints of steel and embedded parts should be welded with submerged arc pressure welding, arc welding or perforated plug welding can also be used, but the welding current should not be large, in order to prevent burns on the steel.