BUG-GY-VERT welding travel carriage has 14.4 V rechargeable battery and magnetic base, and will carry welding torch in flat and vertical positions. It uses guide arms to track and steer into fillet joint and has torch oscillator that allows unit to perform weave welds. Constant travel rate and precise path control increases welding production, improves weld quality, and decreases welder’s fatigue.
http://news.thomasnet.com/fullstory/9013

The GO-Fer III Welding Kit is an economical straight-line welding travel carriage. The all position Fits-All Clamp will
accept and accommodate any hand held welding gun and allow the operator to position the torch at any angle they
desire.
http://www.morotech.nl/used_text/go-fer.pdf

In this system, the machines 20 control individual first and second (e.g., leading and trailing) arcs LA and TA, respectively, where the welding equipment includes a common travel carriage or fixture 30 that moves the arcs and corresponding wire electrodes E 1 and E 2 along a horizontal path in the direction 32 , with each arc and electrode providing deposited material to form a weld on an upper surface of a workpiece WP.
http://www.freepatentsonline.com/y2008/0011728.html