We have designed and developed the linking machines on our own based on our many years gathered experience on stainless steel pipe welding area. Its advantage is with high speed for seam-link, and the seam is on average height, no sidewall undercut and no damage on surface. It could provide better condition for auto welding to effectively improve fabricated efficient before welding in order to grantee the welding quality. It is suitable for spot welding of stainless steel linking-seam (diameter is 219mm-1000mm and thickness is 2mm-30mm). It is much faster than traditional withhold spot welding and there is no indentation and no need to change module.