Kartikasari, Karunia Apriyani (2009) Studi Experimental Dan Analitis Pengaruh Pengelasan Multilayer Gtaw-Smaw Terhadap Umur Lelah Dan Pola Patahan Baja Sa-53b (Pipa Circulation Heater) Pada Uji Lelah Lentur Bolak-Balek (Fatigue Reversed Bending). Other thesis, Institut Teknologi Sepuluh Nopember Surabaya.
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Abstract
Kerusakan shell circulation heater menyebabkan waktu produksi perusahacm pengguna alat tersebut menjadi berkurang. Shell circulation heater yang rusak dapat diperbaiki dengan cara dilas. Pengelasan yang dilakukan hams berkarakter excellent root penetration karena konstmksi dari circulation heater yang tidak memungkinkan dilakukan backgouging. Pengelasan yang bumk akan menimbulkan lack penetration yang dapat dianggap sebagai initial crack, dan akibat adanya pembebanan dinamis akan menyebabkan umur lelah suatu konstmksi menjadi berkurang, terjadi kegagalan lelah. Seperti yang terjadi pada kasus industri, yaitu kegagalan pengelasan SMAW 4 layer pada pipa circulation heater. Sebagai solusi permasalahan tersebut dilakukan pengelasan baja SA-53B grade B dengan Gas Tungsten Arc Welding (GTAW)- Shielded Metal Arc Welding (SMAW) dalam satu groove. Gas Tungsten Arc Welding dilakukan untuk root layer dan layer kedua, selanjutnya dilakukan Shielded Metal Arc Welding sebanyak tiga layer. Hasil pengelasan diuji lelah letur bolak-balik (fatigue reversed bending) dengan mesin LFE-150 pada tingkat tegangan 0,8Su dan 0,7Su dan 0,5 Su, lalu dibandingkan dengan material awal tanpa pengelasan pada tingkat tegangan 0,8Su. Kemudian dicari umur lelahnya dan diplotkan pada kurva S-N, serta diamati secara makro pola patahan yang terjadi. Dari penelitian dapat diketahui bahwa pengelasan multi layer GTAW-SMAW memperbaiki kualitas lasan. Kemudian dari uji lelah yang dilakukan didapat umur lelah hasil pengelasan multi layer dengan tingkat tegangan 0,8Su, 0,7Su dan 0,5Su secara bertumt-tumt adalah sebagai berikut: 9,5 x 10s siklus, 2,2 x 106 siklus dan 5,5 x l(f siklus (belum patah). Sedangkan dari pengamatan pola patahan didapatkan 87,23% daerah patah statik dan 12,77% daerah patah lelah untuk tingkat tegangan 0,8Su dan 79,97% daerah patah statik dan 20,03% daerah patah lelah pada tingkat tegangan 0,7Su
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Damage to the circulation heater shell causes the production time of the company using the tool to be reduced. A damaged circulation heater shell can be repaired by welding. The welding carried out must have excellent root penetration characteristics due to the construction of the circulation heater which does not allow backgouging. Poor welding will cause lack of penetration which can be considered an initial crack, and due to dynamic loading it will cause the fatigue life of a construction to be reduced, resulting in fatigue failure. As happened in an industrial case, namely the failure of SMAW 4 layer welding on the circulation heater pipe. As a solution to this problem, SA-53B grade B steel was welded with Gas Tungsten Arc Welding (GTAW)- Shielded Metal Arc Welding (SMAW) in one groove. Gas Tungsten Arc Welding is carried out for the root layer and second layer, then Shielded Metal Arc Welding is carried out in three layers. The welding results were tested for reverse bending fatigue with an LFE-150 machine at stress levels of 0.8Su and 0.7Su and 0.5 Su, then compared with the initial material without welding at a stress level of 0.8Su. Then the fatigue life is found and plotted on the S-N curve, and the macro pattern of fractures is observed. From the research it can be seen that multi layer GTAW-SMAW welding improves weld quality. Then, from the fatigue tests carried out, the fatigue life of multi-layer welding results with stress levels of 0.8Su, 0.7Su and 0.5Su respectively was as follows: 9.5 x 10s cycles, 2.2 x 106 cycles and 5 .5 x l(f cycle (not yet broken). Meanwhile, from observing the fracture pattern, it was found that 87.23% of the static fracture areas and 12.77% of the fatigue fracture areas for a stress level of 0.8Su and 79.97% of the static fracture areas and 20.03 % fatigue fracture area at 0.7Su stress level
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 620.112 6 Kar s-1 2009 |
| Uncontrolled Keywords: | GTAW, SMAW, multi layer, crack, uji lelah; GTAW, SMAW, Multi layer, crack, fatigue test |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. T Technology > TA Engineering (General). Civil engineering (General) > TA 459 Metal foams. T Technology > TA Engineering (General). Civil engineering (General) > TA460 Metals--Fatigue. |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | EKO BUDI RAHARJO |
| Date Deposited: | 25 Oct 2023 03:30 |
| Last Modified: | 25 Oct 2023 03:30 |
| URI: | http://repository.its.ac.id/id/eprint/104991 |
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