| 摘要 |
A method and apparatus for welding workpieces wherein the workpieces are defined by a structure having a plurality of areas with joined and bonded locations with at least one of the areas being different in depth than the depth of its adjacent area. At least one group of welding heads is provided in a predetermined spacial arrangement. When the welding heads are activated, they operate to join and bond the workpieces at certain joined and bonded locations. A carriage is provided to move the workpieces under the welding heads. Limit switches and a control circuit are provided for stopping the workpieces under the welding heads so that a first zone on the workpieces, which includes portions of more than one of the areas of different depths are under the welding heads. Means are also provided for lowering the welding heads until they come into contact with and exert pressure on the workpieces adjacent the location to be welded in the areas different in depth in the first zone. The apparatus can be set for lowering only certain predetermined welding heads. The heads exert pressure on the workpieces adjacent to the locations to be welded in the areas different in depth in the first zone. A flow of shielding gas is provided in the locations to be welded. The welding heads are activated to weld the workpieces at the locations to be welded in the first zone. The apparatus also includes welding wire for feeding towards the locations to be welded and a power supply and arc igniting current, so that a welding arc is ignited between the workpieces and the welding wire. Upon completion of the welding process in the first zone, the welding heads are lifted. The workpieces are sequentially advanced so that all the zones to be welded are stopped for a welding operation under the welding heads.
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