Analysis of Weld Defects in TIG Welding of St 37 Steel with Variations in Welding Current

Mochammad Alief Mahardika; Achmad Rijanto; Nuril Ahmad

doi:10.59890/ijatss.v4i8.298

Authors

Mochammad Alief Mahardika Mahasiswa Teknik Mesin Unim
Achmad Rijanto Mahasiswa Teknik Mesin Unim
Nuril Ahmad Mahasiswa Teknik Mesin Unim

DOI:

https://doi.org/10.59890/ijatss.v4i8.298

Keywords:

TIG Welding, ST 37 Steel, Welding Defects, Heat Input, Dye Penetrant Inspection

Abstract

TIG (Tungsten Inert Gas) welding is a welding method widely used in the manufacturing industry because it produces high-quality joints, good precision, and low contamination levels. However, the quality of the weld is significantly influenced by the welding parameters, particularly the electric current used. This study aims to analyze the effect of varying TIG welding currents on weld defects in ST 37 steel using the Dye Penetrant Inspection (DPI) method. The current variations used were 80 A, 90 A, and 100 A. The results showed that the 80 A current produced the most defects, in the form of porosity and incomplete penetration, with a defect percentage of 50%. The 90 A current produced the best weld quality with a defect percentage of 16.67%, while the 100 A current produced defects in the form of undercuts and distortion, with a defect percentage of 33.33%. The heat input values obtained were 0.80 kJ/mm, 0.90 kJ/mm, and 1.00 kJ/mm, respectively. Based on the research results, it can be concluded that a current of 90 A is the most optimal welding parameter for TIG welding of ST 37 steel

References

AWS. 2020. AWS D1.1 Structural Welding Code – Steel. American Welding Society, Miami, USA.

Cary, H. B., dan Helzer, S. C. 2019. Modern Welding Technology. 7th Edition. New Jersey: Pearson Education.

Daryanto. 2020. Teknik Pengelasan dan Fabrikasi Logam. Bandung: Yrama Widya.

Haryadi, B., dan Nugroho, A. 2022. “Analisis Pengaruh Variasi Arus Pengelasan TIG terhadap Kekuatan Tarik Baja ST 37.” Jurnal Teknik Mesin, Vol. 10 No. 2, hlm. 45–52.

Irawan, D. 2021. “Pengaruh Variasi Arus Las TIG terhadap Cacat Las pada Baja Karbon Rendah.” Jurnal Rekayasa Material dan Manufaktur, Vol. 5 No. 1, hlm. 33–40.

Kou, S. 2019. Welding Metallurgy. 3rd Edition. New Jersey: John Wiley & Sons.

Mulyadi, T. 2023. “Pengaruh Heat Input terhadap Kualitas Sambungan Las TIG pada Baja ST 37.” Jurnal Teknik Industri dan Manufaktur, Vol. 8 No. 1, hlm. 15–23.