Arifin Amir, Wijaya Muhammad R Y Q A, Barata La Ode Ahmad, Ramli Mohd Ikram
Mechanical Engineering Department, Halu Oleo University, Kendari 93232, Indonesia.
Department of Mechanical Engineering, Sriwijaya University, Indralaya 30662, Indonesia.
Materials (Basel). 2024 Nov 25;17(23):5780. doi: 10.3390/ma17235780.
This study explores the effect of preheating on the toughness of dissimilar welded joints between AISI 1037 and AISI 304 steels, using Shielded Metal Arc Welding (SMAW) and E309-16 electrodes. The innovation of this approach lies in assessing how preheating temperatures influence the mechanical properties of such welds. Preheating temperatures ranged from 150 °C to 300 °C, with impact testing revealing a notable increase in toughness, from 6.01 Joules at 150 °C to 19.57 Joules at 300 °C. Hardness tests indicated a maximum hardness of 313 VHN in the fusion zone and a minimum of 185 VHN in the AISI 304 area. Compared to non-preheated joints, preheating significantly enhanced impact strength and altered the fracture mode from brittle to ductile. Macrostructural and microstructural analyses with optical microscopy and SEM showcased changes in fracture surfaces and microstructural evolution, highlighting the improvement in mechanical properties due to preheating. These findings demonstrate that preheating critically enhances the toughness and overall performance of dissimilar metal welds, making it a valuable technique in industrial applications where enhanced joint toughness is crucial.
本研究采用手工电弧焊（SMAW）和E309 - 16焊条，探讨了预热对AISI 1037钢与AISI 304钢异种焊接接头韧性的影响。该方法的创新之处在于评估预热温度如何影响此类焊缝的力学性能。预热温度范围为150℃至300℃，冲击试验表明韧性显著提高，从150℃时的6.01焦耳增加到300℃时的19.57焦耳。硬度测试表明，熔合区的最大硬度为313维氏硬度，AISI 304区域的最小硬度为185维氏硬度。与未预热的接头相比，预热显著提高了冲击强度，并使断裂模式从脆性转变为韧性。通过光学显微镜和扫描电子显微镜进行的宏观结构和微观结构分析展示了断口表面的变化和微观结构的演变，突出了预热对力学性能的改善。这些发现表明，预热显著提高了异种金属焊缝的韧性和整体性能，使其成为工业应用中提高接头韧性至关重要的一项有价值技术。
