The mechanism of the influence of stress changes in the Sheet Metal Bending process on the quality of customized sheet metal welded parts
Publish Time: 2024-11-05
In the Sheet Metal Bending process, stress changes have a crucial impact on the quality of customized sheet metal welded parts.When the sheet metal material is subjected to bending force, stress is generated inside. On the outside of the bend, the material is subjected to tensile stress, while the inside is subjected to compressive stress. This uneven stress distribution is one of the key factors affecting the quality of welded parts. If the tensile stress is too large, it may cause micro cracks in the sheet metal material at the bend. These micro cracks will become stress concentration points in the subsequent welding process, reducing the strength of the welded joint. For example, when subjected to external force, the weld may start to expand from these micro cracks, eventually causing the welded part to break.At the same time, the residual stress generated by Sheet Metal Bending will affect the dimensional accuracy of the welded parts. The presence of residual stress may cause the sheet metal to deform after welding, destroying the originally designed shape and size. For customized sheet metal welded parts, accurate dimensions are crucial, and any slight deformation may cause assembly problems or affect its performance. Moreover, this deformation may be further aggravated during the welding process, because the welding heat input will cause new stress changes, which will be superimposed on the bending residual stress.During welding, the stress state at the Sheet Metal Bending will also affect the quality of the weld. If the stress distribution is unreasonable, defects such as pores and slag inclusions may appear in the weld. Because the existence of stress may change the solidification mode of the weld metal and the flow characteristics of the molten pool. In addition, the interaction between the heat-affected zone and the bending stress during welding may deteriorate the microstructure and properties of the heat-affected zone and reduce the overall quality of the welded parts. In order to ensure the high quality of customized sheet metal weldments, it is necessary to have a deep understanding of the bending stress changes and control and reduce the adverse effects of these stresses through reasonable process adjustments, such as pre-deformation, selection of appropriate bending sequence and welding parameters.
