Description: A fairwater plane is the horizontal fin towards the top part of a submarine. It is made out of HY80 steel and is hollow with tar like material filling the inside. Cracking frequently occurs and requires weld repair. The normal repair procedure required scarfing, preheating, and welding the cracked area. Each repair cycle would normally take 1-2 shifts plus 24 hours for cool-down.
Normal Performance: Reoccurring cracking within 24 hours of repair welding was common. This reoccurrence of the cracking after weld repairing was severe ranging between 20 to 45 times per fairwater plane.
Performance After Meta-Lax Weld Conditioning: Meta-Lax Weld Conditioning was added to the weld procedure on two fairwater planes for testing. The first one had already been welded 40 times. MLWC was applied and they did not use any preheat. After the 24 hour cool-down the fairwater plane was inspected and no cracks were found. MLWC was applied to a second fairwater which had just not yet been repair welded. Following the first weld repair there was a small crack identified. Following the second weld repair with using MLWC there were no cracks found.