... mainly used in metal tube welding,alloy cutter welding,carbide saw blade welding,diamond saw blade welding,core drill bit welding and so onMetal tube ... as cooper tube,steel tube,and aluminum tube's butt welding,plug welding and welding sets.The advantage for use the metal tube ... no oxidation layer5.The apperance is exquisite,firm,full after welding Portable induction machine picture:Company