Analisa Pengaruh Variasi Media Pendingin dan Ukuran Elektroda pada Proses Preheating Baja St 42 pada Proses Pengelasan SMAW Terhadap Sifat Mekanik dan Cacat Las. (Analysis of The Effect of Cooling Media Variations and Electrode Size in The St 42 Steel Preheating Process in The SMAW Welding Process on Mechanical Properties and Weld Defects).

Prasetyo, Tri Jatmiko Aji (2024) Analisa Pengaruh Variasi Media Pendingin dan Ukuran Elektroda pada Proses Preheating Baja St 42 pada Proses Pengelasan SMAW Terhadap Sifat Mekanik dan Cacat Las. (Analysis of The Effect of Cooling Media Variations and Electrode Size in The St 42 Steel Preheating Process in The SMAW Welding Process on Mechanical Properties and Weld Defects). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.

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Abstract

In the industrial world in the field of construction, the welding process is one of the most frequently used jobs. Welding is often used in the process of joining metal materials, as well as maintenance on tools made of metal or stainless steel, the scope of the use of welding techniques in construction is very broad, including shipping, bridges, steel frames, pipelines and so on. In this study, the SMAW (Shield Metal Arc Welding) welding method was used using preheating heat treatment with variations in water, oil and air cooling media and variations in electrode diameter, namely Ø2.6 mm, Ø3.2 mm, Ø4 mm using RD460 electrode types. First, RAW specimen data collection is used for comparison of data before any process is carried out and after preheating and welding processes have been carried out, secondly, specimen data collection after preheating and welding processes, then welding results are subjected to dye penetrant tests, hardness tests and tensile tests, the third stage is data analysis, where the data that has been obtained from the test results is processed and evaluated and then conclusions are obtained. The results of rockwell hardness testing from variations in cooling media and variations in electrode diameter can be seen that the highest hardness value is in the base metal area of 72.33 HRB with water cooling media using Ø4 electrodes. In the tensile test the highest stress and strain values were obtained in the hardening treatment using water cooling media with 4 diameter welding of 46.40 N/mm² with a strain value of 30.20%. And the smallest strain stress value is obtained in the air cooling medium for welding using a diameter of 3.2 with a stress value of 38.73 N/mm² with a strain value of 44.31%. From the effect of the welding process using electrodes Ø2,6, Ø3,2 and Ø4, the highest value of welding defects was found in welding variations of Ø2,6, cooling media for oil, air, Ø3,2 water and Ø 4, cooling media for water, oil, air, while the welding defects were the most a little in can at welding Ø2,6 water, Ø3,2 oil and air

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