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Residual stress that occurs during welding is also a negative impact on the stability by lowering the durability of the vehicle. In addition, deformation due to the heat generated at this time causes a problem in the assembly of the vehicle body. In order to minimize deformation and residual stress caused by welding, it may be change the welding sequence, or using further processing (such as pinning). But adding process (such as pinning) after the welding process is not suitable for mass production because the budget and the total process time increasing. Therefore, in the study, it was studied on the residual stress of the product (Rear CTBA trailing Arm) to prevent excessive deformation and reduced durability. We have also studied the deformation and residual stresses of products to a minimum for optimal welding procedures. As a result, welding deformation was occurred the maximum deformation about 3.85 mm at the ends of the beam and residual stress was occurred greater than 500 MPa in the heat affected zone. It is also found that the overhead welding process is the optimum welding process.

Welding Residual Stress Evaluation and Process Optimization of CTBA Trailing Arm using Finite Element Analysis