... can weld M3-M12 stud screw. 2.Long life time and high quality configuration! 3.Portable Stud welding machine characteristic:* Machine adopts ... , stainless steel, copper alloys, aluminum material;* Time is short, the work itself charging high efficiency;* Second-ranking screen shows working voltage ... 430×510×155 Weight(KG) 21.5 Long life time and high quality Configuration!!!! Packing:Welding Sample: