No gas is needed, the welding operation is convenient and flexible . Suitable for outdoor air when the welding . Stable arc starting, continuous welding, high efficiency . Good crack resistance, small splash, beautiful molding . Vacuum packaging, easy to carry. Apply to 304 materials, can also be used for 308L materials No gas is needed, the welding operation is convenient and flexible Suitable for outdoor air when the welding Stable arc starting, continuous welding, high efficiency Good crack resistance, small splash, beautiful molding