Profile: A J Alder & Son Ltd. is a provider of welding and fabrication for stainless steels. Our stainless steel fabrications are assembled using welding, riveting, or nuts and bolts. Stainless steel is used typically in corrosive areas, storage vessels, marine fittings, and other exposed architectural structures. Our welding and fabrication of stainless steel is complicated by the fact that there are several grades of stainless steel such as austentic, duplex, martensitic, and ferritic. Our austentic grades are the easiest, and can be welded with all the usual electric methods.