Abstract: An end face of a work-piece having a circular opening is welded upon by apparatus which includes a stationary post mounted by a mounting assembly to the work-piece with its longitudinal axis coincident with the axis of the opening. A rotating assembly includes a sleeve rotatably mounted on the post and supporting a slide extending laterally from the sleeve. A weld head is supported by a carriage which reciprocates along the slide and has a weld electrode extending toward the end face of the work-piece. Rotation of the sleeve and movement of the carriage are coordinated so that a spiral weld pattern with overlapping turns is laid down on the end face. Cooling water and cover gas, as well as electrical power and control signals for GTAW-HW welding are delivered to the rotating assembly through rotating connections on the post.

Abstract: A trailer particularly for loading and unloading hay bales has a pivotal loading carriage at its rearward end with loading forks which can be backed under a bale and used to lift the bale onto the trailer by pivotal movement of the carriage. The trailer includes a longitudinally movable carrier with a releasable fork for moving the bale from the carriage toward a forward end of the trailer, and also for unloading bales by reverse movement of the carrier. A winch and cable drive is provided both for moving the carrier lengthwise along the trailer in forward and reverse directions, and for providing pivotal movement of the carriage when the carrier is received therein.