Electronic Theses and Dissertation

Abstrak penelitian ini menganalisis pengaruh variasi metode root pass terhadap pengelasan dissimilar metal antara baja karbon astm a36 dan stainless steel 304 menggunakan pengelasan smaw dan pengelasan gtaw–smaw. pengujian meliputi distorsi, kekerasan, tarik, ndt, dan pengamatan mikrostruktur. hasil menunjukkan bahwa pengelasan gtaw–smaw menghasilkan distorsi lebih kecil, kekuatan tarik lebih tinggi (47,30 kgf/mm² dibanding 43,76 kgf/mm²), serta distribusi kekerasan yang lebih stabil dibanding smaw. uji ndt dan metalografi memperlihatkan sambungan bebas cacat dengan fusi logam yang baik. secara keseluruhan, metode pengelasan kombinasi gtaw–smaw memberikan kualitas sambungan terbaik dari segi kekuatan mekanik dan struktur mikro. kata kunci: pengelasan dissimilar metal, root pass, smaw,gtaw, kekuatan tarik, kekerasan, mikrostruktur  

ABSTRAK This study analyzes the effect of root pass method variations on dissimilar metal welding between ASTM A36 carbon steel and 304 stainless steel using SMAW and GTAW–SMAW welding. The tests include distortion, hardness, tensile, NDT, and microstructure observation. The results show that GTAW–SMAW welding produces smaller distortion, higher tensile strength (47.30 kgf/mm² compared to 43.76 kgf/mm²), and more stable hardness distribution than SMAW. NDT and metallography tests show defect-free joints with good metal fusion. Overall, the combined GTAW–SMAW welding method provides the best joint quality in terms of mechanical strength and microstructure. Keywords: Dissimilar metal welding, root pass, SMAW, GTAW, tensile strength, hardness, microstructure