ANALISIS WELDING SEQUENCE DENGAN PENAMBAHAN TRANSIENT THERMAL TENSION PADA DUCTING TERHADAP DEFORMASI DAN TEGANGAN SISA

Abstract

In fabrication process of a construction there is often experiences obstacles within the implementation. Deformation is an obstacle that often occurs and can holding up the further fabrication process. Deformation causes problems in the form of misaligned connections between parts, which can cause excessive stress concentrations. Like the process of ducting which had deformation during the assembly process. Ducting deformation occurs in the base metal part after the welding process is carried out between one part and another. This problem happen as a result of excessive heat input on some sides,  so that the heat is distributed unevenly across the base metal. The purpose of this final project research to analyze of welding sequence and the addition of transient thermal tension on deformation and residual stress in ducting using the finite element method. After the analysis was done,  the results were obtained in the form of a quite significant difference in the deformation of welding sequences, where welding sequence 2 was 2.1169 mm. Then the residual stress that occurs of welding sequences is 192.27 MPa. From welding sequences are given additional heat that is line heating and the results obtained can reduce deformation significantly. However, the addition of heat can increase the high residual stress on welding sequence with transient thermal tension 200 °C distance 1000 mm the value up to 806.45 MPa. From the results , it is concluded that the greater the deformation value that given, the smaller the residual stress value will be. Otherwise , the smaller the deformation value, the greater the residual stress value.