Abstract: An alignment tool, such as a Z-bar or a crossover Z-bar, for use in a welding device for seam welding cylindrical can bodies, has the improvement that the guide grooves for the Z-bar are formed in inserts mounted in the body so that at least the material of the body can be non-conductive and non-magnetic and the insert can be non-magnetic to prevent or lessen the chances of sparking in the welding machine. In one embodiment, the inlet end is provided with an inlet body formed of an impact resistant, wear-resistant material, such as a tungsten carbide, while the inserts in which the guide grooves are formed is formed of a ceramic material that is both non-magnetic and non-conductive.

Abstract: An alignment tool is provided for use in a metal cylindrical can welding machine which is an integral unit constructed of discrete component parts comprising an insulating part and a guide part of high strength and hardness. The insulating part prevents electrical current from passing through the alignment tool thereby preventing spark erosion, increased wear and inefficiency. The high strength part provides the necessary characteristics required for guiding the edges of the can body blanks to the welding rollers and can be selectively replaced for repair or modification thereby reducing repair costs.