A 180-degree pipe elbow having one end extending beyond the other end and method of joining a 180-degree pipe elbow to lengths of cooling pipe to form a cooling panel for use in a furnace, boiler or other industrial heating apparatus that benefits from assistance of a cooling panel. Having one end of the elbow extend beyond the other end of the elbow enables the one end to be joined to a length of pipe by welding whereby the joining may be by automatic welding which will reduce manufacturing costs and ensure a quality weld.