VARIASI ARUS DAN SUDUT PENGELASAN PADA MATERIAL AUSTENITIC STAINLESS STEEL 304 TERHADAP KEKUATAN TARIK DAN STRUKTURMAKRO

Vuri Ayu Setyowati, Suheni Suheni

Abstract


ABSTRACT

            Welding is the common method for joining material used in construction and industrial applications. Variable of welding process is the most important factor affected into the mechanical properties of welded materials.  This study used Shielded Metal Arc Welding (SMAW) as welding method. SMAW method use flux to protect the metals. Sample preparations were done to make the V groove using 45ᵒ and 60ᵒ as angle of welding. Variations of heat input also were used as 75A, 85A, and 95A. Characterization of mechanical properties was analyzed by tensile test and macroscopic analysis showed the different area after welding. Based on the following experimental result, the highest ultimate tensile strength was obtained by sample  prepared 45ᵒ of V groove angle and 85A of current which is 518 N/mm² and got 449 N/mm² of  yield strength. Increasing current caused the wider weld pool in the sample surface and showed clear grove shape of welded sample. 

ABSTRAK

Pengelasan merupakan metode penyambungan material yang secara umum digunakan dalam  bidang konstruksi maupun aplikasi di industri. Parameter pengelasan perlu diketahui karena berpengaruh terhadap sifat mekanik yang dihasilkan material setelah proses penyambungan Pada penelitian ini, proses pengelasan yang digunakan adalah Shielded Metal Arc Welding (SMAW). Pengelasan SMAW menggunakan fluks sebagai pelindung logam. Preparasi sampel dilakukan dengan pembuatan sudut pengelasan/sudut kampuh 45ᵒ dan 60ᵒ.  Arus pengelasan bervariasi sebesar 75A, 85A, dan 95A. Karakterisasi sifat mekanik diperoleh dari pengujian tarik dan pengamatan makro untuk mengetahui perubahan daerah yang berbeda setelah dilakukan pengelasan. Berdasarkan hasil pengujian, spesimen benda uji dengan sudut pengelasan 45ᵒ besar beban maksimal (σu) terjadi pada arus 85 A yaitu sebesar 518 N/mm² dan memiliki tegangan luluh paling tinggi yaitu  449 N/mm². Kenaikan arus pengelasan menyebabkan weld pool yang lebih besar dan permukaan penampang samping terlihat jelas bentuk kampuh sampel pengelasan.


Keywords


Pengelasan SMAW; Kekuatan Tarik SS 304 dan SS 304L; Analisa struktur makro

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