This database contains the synchronized sound, current and voltage signals measured at different benchmark transfer modes in gas metal arc welding. The benchmark metal transfer modes include three groups, i.e., contact, free flight and controlled. In each group, there are four modes. In Group 1 (contact transfer), the four modes are pure liquid bridge (1b2), forced contact (1c3), repel globular (1g4) and gasless explosive (1e10). In Group 2 (free flight transfer), the four modes are...