| Summary: | This maser thesis has been performed at Ferruform AB in Luleå. Ferruform is a wholly owned subsidiary of Scania and is Luleå’s largest engineering. Scania and Ferruform are constantly working with improvements so they can be better than their competitors. Part of the improvement work is to find new, more efficient and affordable product solutions. Scania and Ferruform have a desire to from the current situation with a casted stiff crossmember produce a stiff crossmember by sheet metal forming and welding. Previous work has been done at Ferruform according to the welded solution for the stiff crossmember. The work resulted in conclusions that the welded stiff crossmember does not fit into the current flows at Ferruform.The aims for the master thesis is to develop a production structure for the welded stiff crossmember where focus should be on the operator’s work and to create a functional flow that fits with the current flows at Ferruform. The main goal is to generate a lower coat for the welded stiff crossmember than the current casted stiff crossmember.Methods used to develop the production structures are observations and interviews. Data and information is mainly obtained through in-house material from Ferruform but also by earlier work with the stiff crossmember. The theories that the master thesis draws on are relevant manufacturing processes required to manufacture the crossmember but also Scania’s production system (SPS).Based on requests from Ferruform, where two production structures developed, one with the conventional welding method MAG and one with the slightly newer welding method laser welding. The two welding methods make different demands on the manufacturing but also generates in different costs for the final stiff crossmember. The concept with MAG welding generates higher costs for the final product, despite a lower investment cost. This is due to a high material consumption in comparison to laser welding but also because of the use of welding wire. Nevertheless is MAG welding a proven and ...
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