Abstract:Characteristic analysis between pneumatic servo spot welding gun and traditional pneumatic gun were compared by aimed at different welding processes. At gradual welding close stage, pneumatic servo spot welding gun was better in cushion control than traditional pneumatic gun, and its electrode was contacted with the weldment softly which improved welding quality and electrode lifetime. At the force preloading stage, the response of electrode force was quicker and was able to be regulated quickly to meet the welding requirement of welding force changing. The experimental results show that pneumatic servo spot welding gun has certain advantage over traditional pneumatic welding gun, and has wide application prospects.