Abstract
MPM sheets represent the sanwich panels consisted of two low carbon steel sheets 3 mm thick separated by a visco-elastic inner layer. It is used for dampening the structure borne sound and it replaces the structural sheet metal without taking up a considerable amount of space. The inner layer, however, makes the welding more difficult, since it burns when exposed to relatively high welding temperatures. This may cause distorsion and separation of sheet metal, as well as the loss in sound dampening properties. Therefore, it is of utmost importance that the visco-elastic inner layer remains intact as much as possible, while still maintaining a low cost and a high productivity during welding of MPM sheet housing of large industrial electric motors and generators. In this paper, gas metal arc welding (GMAW) with CO2 active gas was used in an attempt to produce suitable butt welds, welded from both sides. To prevent distorsion and burning of inner layer different butt welds were tested. Different combinations of the following welds were tested: open square weld, combined open square weld on one sheet and single V on the other side, welding in one pass on each side and welding in multiple bead segments on each side. It was found that in all cases, a full penetration was achieved. Furthermore, inner layer thickness near the weld and potential distorsion strongly depend on the welding methodology used.
Published Version
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