Ran across another unusual weld joint. It's basically a slip joint like in socket welding, except it's a structural tubular assembly with one side of the joint slipping over the internal lip of the other. The piece that slips under the other, is thicker and only the O.D's match up in the finished weld. The 'slip over' side of the joint is beveled and it's opposite adjoining member's external geometry resembles a square butt on that side of joint. At a glance, the joint appears to be a single-bevel CJP with a backing strip integral with only one member. I'm sort of inclined to call this fillet weld that only looks like groove weld. The joint doesn't look like it would fall into any prequalified designs, except for a fillet weld. What's anybody else's take on this oddball ?