Linyi city. Hengquan welding machine is produced and sold by Linyi Juheng Electromechanical Equipment Co., Ltd. According to Baidu map, the company is located in Wuyu Village, Tanghe Town, Hedong District, Linyi City, Shandong Province. Electric welding machine uses the high-temperature arc generated when the positive and negative electrodes are short-circuited instantly to melt the solder and the material to be welded on the electrode, so as to achieve the purpose of combination.