welding,machine welding,arc welding 1.welding strcutural assembly 2. Small-volume,large-variety production welding,machine welding,arc welding 1.material: steels,aluminium,copper and so on2. the perfect ... work,eg.spare parts if machine breaks down 6. Small-volume,large-variety production7. Large and heavy metal plates processing welding,machine welding,arc welding parts