Abstract: Objective This study aims to compare low-temperature low cycle fatigue performance of TIP-TIG (TT) and submerged arc welding (SAW) joints, and to establish a fatigue life prediction model suitable for liquefied natural gas (LNG) service conditions. Methods Low cycle fatigue tests were performed on TT and SAW joints of 9Ni steel under strain control at room temperature and −120 ℃. Based on the experimental data, fatigue life models such as Manson-Coffin, Morrow and SWT were fitted. Results The results show that low temperature increases cyclic stress amplitude of both types of welded joints, while TT joints exhibit more stable cyclic behavior and a significantly longer fatigue life, mainly due to its refined weld microstructure and lower defect sensitivity. Among the evaluated models, SWT model provides the highest prediction accuracy at low temperature. Conclusion TT is more suitable for low temperature service conditions of LNG applications, and the established strain life models can provide useful reference for fatigue life evaluation and welding process optimization of critical welded components.