Pengaruh radius bending dan tebal pelat terhadap sifat mekanik HAZ pelat baja grade A pada pengelasan SMAW

Prasojo, Budi (2005) Pengaruh radius bending dan tebal pelat terhadap sifat mekanik HAZ pelat baja grade A pada pengelasan SMAW. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses pengelasan pelat yang telah dibending perlu mendapat perhatian khusus karena akan menghasilkan sifat mekanik yang sangat berbeda pada HAZ-nya bila dibandingkan dengan pengelasan baja yang tidak dibending. Oleh karena itu, tujuan utama dari penelitian ini adalah menganalisis distribusi hardness di HAZ sebagai akibat pengelasan dengan SMAW (Shielded Metal Arc Welding) terhadap baja tanpa bending dan dengan bending. Spesimen penelitian ini adalah baja Grade A dengan ukuran 1.000 mm × 200 mm untuk ketebalan 6 mm, 8,1 mm, dan 11,1 mm.

Pada awalnya, setiap ketebalan spesimen dibuat alur las dan dibending dengan radius bending 500 mm, 750 mm, dan 1.000 mm. Kemudian dilakukan pengelasan dengan SMAW. Kemudian, spesimen dipotong melintang pada kampuh las untuk diambil 3 replikasi setiap kondisi pengelasan. Uji hardness dilakukan dengan mengambil 3 level ketebalan, yakni di permukaan, di tengah, dan di dasar. Pada tiap level terdapat 11 titik pengujian, yaitu 3 titik di base metal, 5 titik di HAZ, dan 3 titik di weld metal.

Dari hasil pengujian didapatkan bahwa radius bending dan tebal pelat berpengaruh terhadap nilai hardness HAZ. Semakin besar radius bending, semakin tinggi nilai hardness HAZ yang terjadi. Demikian juga, semakin tebal pelat, semakin tinggi pula nilai hardness HAZ yang terjadi. Nilai hardness HAZ terendah (136,43 HV) didapatkan pada level tengah (Y) spesimen dengan radius bending 500 mm dan tebal 6 mm. Sedangkan nilai hardness HAZ tertinggi (205,89 HV) didapatkan pada level dasar (Z) spesimen dengan radius bending 0 (tanpa bending) dan tebal 11,1 mm.
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The welding process of a bent plate needs special attention because it will produce mechanical characteristics that are significantly different in its HAZ. Therefore, the main objective of this research is to analyze the distribution of hardness in the HAZ as a result of welding by SMAW (Shielded Metal Arc Welding) on steel plates that have experienced plastically cold-working deformation. The research specimens are Grade A steel with dimensions of 1,000 mm × 200 mm and thicknesses of 6 mm, 8.1 mm, and 11.1 mm.

In the first treatment, a welding groove was made on each specimen thickness, which was then bent with bending radii of 500 mm, 750 mm, 1,000 mm, and 0 mm (without bending), and subsequently welded using SMAW. The next treatment involved cutting the specimens transversely across the welding groove to obtain three replicated specimens for each welding condition. Hardness testing was performed at three thickness levels of each specimen: the surface, middle, and base. At each level, there were 11 examination points, consisting of 3 points in the base metal, 5 points in the HAZ, and 3 points in the weld metal.

The results of the examination show that the bending radius and plate thickness affect the HAZ hardness value. The greater the bending radius, the higher the resulting HAZ hardness. Likewise, increasing plate thickness progressively results in higher HAZ hardness. The lowest HAZ hardness value (136.43 HV) was obtained in the specimen with a 500 mm bending radius and 6 mm thickness, while the highest HAZ hardness value (205.89 HV) was obtained in the specimen with a 0 mm bending radius (without bending) and 11.1 mm thickness (201.76 DPH).

Item Type:	Thesis (Other)
Additional Information:	671.52 Bud p
Uncontrolled Keywords:	Pengelasan, bending, deformasi plastis, HAZ & hardness, welding, bending, plastically deformation, HAZ & hardness
Subjects:	T Technology > TS Manufactures > TS227 Welding.
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	magang .
Date Deposited:	07 Oct 2026 01:13
Last Modified:	07 Oct 2026 01:14
URI:	http://repository.its.ac.id/id/eprint/145353

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