Bolt welding system and welding method for bolt welding

The invention discloses a bolt welding system and a welding method for bolt welding. The bolt welding system for the bolt welding comprises a bolt welding robot and a control device used for controlling the bolt welding robot to operate. The bolt welding robot and the control device are in communicated connection. The bolt welding system for the bolt welding is characterized in that the bolt welding robot is provided with a welding device, the control device is in communicated connection with a tool clamp used for fixing a workpiece through a programmable logic controller and the welding device is matched with the tool clamp. According to the bolt welding system and the welding method for the bolt welding, manual welding conducted on workpieces such as a welded seam and a bolt by a worker can be completely replaced, when the bolt welding robot welds each welded seam, a welding parameter of each welded seam is constant, welding seam quality is influenced by manual factors to a small extent and welding accuracy and beauty are improved.