1. Both ends have joints, one end is used for welding and the other end is used for connection. 2. Single head joint: Only one end has a joint, used for welding and connection. 3. Screw joint: Both ends have threads, one end is used for welding, and the other end is used for connection. 4. Elbow joint: Only one end has an elbow, used for welding and connection. 5. Connection joint: Only one end has a connection, used for welding and connection. 6. Tee joint: All three ends have joints, used for welding and connection.
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