Date of Publication :17th August 2017

Abstract: There is a necessity for boom arm assembly which is one of the subassemblies of an ongoing project at L&T Construction Equipment Limited. So it is necessary to develop a tack welding fixture to reduce the cycle time and reduce welding distortions Tack welding is a temporary weld used to create an initial joint between two pieces of metal being welded together .Full welding is a continuous welding of metal joints using electric arc. In this work an attempt has been made to develop, modify and generate concepts to mount the sub-assemblies from the boom arm assembly onto fixtures to perform tack welding and full welding. For developing the welding fixtures some of the important Critical to Quality (CTQ) issues are orientation of the tube, gap between the two sub-assemblies, clamping, land between the mid-plates and the front plate edge in and perpendicularly between mid plates and front plate. After developing this fixture we may save up to 112.3 minutes per boom arm assembly. Assembly of boom arm assembly without using fixture is 45 units per day after developing the fixture it increases to 60 units per day so that the production is increased and the assembly can be carried out faster

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