Welding and Brazing Services
IMR, Inc. has, over the years, successfully arc welded hundreds of crankshafts up to 1500 ton capacity. Our process includes preheat, proven welding techniques, vibration stress relief, normalizing, rough machining and finish grinding on our crankshaft grinders.
Cast iron is one of the hardest materials to securely weld and braze because of its unique properties. It has a crystaline structure that when heated and welded does not cool evenly and as a result cracks and inclusions will form to render the repair useless. Most repairs only last a few weeks before they will again crack at the welded seams.
There are three common ways to fix a broken cast iron casting — Arc welding (either with nickel rod, or nickel free cast iron rod), fusion welding with O/A, and brazing with O/A.
Heavy brazing itself is a skill within a skill. At IMR, Inc. our record at heavy cast iron brazing speaks proudly of itself. Many press components which appear to be un-repairable are expertly and permanently repaired by this process.