Studi perbandingan proses pengelasan antara metode gas metal arc welding (GMAW), gas tungsten arc welding (GTAW) dan plasma arc welding (PAW) pada baja lembaran lapis seng dengan ketebalan 1 MM = Characterization study of welding process between gas metal arc welding )GMAW), gas tungsten arc welding (GTAW) and plasma arc welding (PAW) method in joining zinc coated steel sheet with 1MM thickness