Analisa Pengaruh Proses Normalizing Terhadap Sifat Mekanik Sambungan Las Pegas Daun Baja Sup9

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Abstract: Welding is a fabrication that joins, by meeting the workpieces and adding afiller material to form a pool of molten material (the weld pool) that cools to became a strong joint, with pressure sometimos used inconjunction with heat. Meeting the workpieces with heat leads to changes in physical and mechanical properties. The mechanical properties of steel leaf spring SUP9 before welded are: the arnés value is 424,27 BHN; Tensile strenght is 1213,75 N/mm2, and strain is 16,39 %. Once welded value change to: the harness value is rice up to 597,21 BHN; tensile strength is rise up to 1557 N/mm2, and strain is down to 9,33 % The changing in physical and mecánica properties of steel leaf springs SUP9 which influence of welding process can be recovered by heat treatment process of normalizing which is cooled the room temperatura and in the 100 celsius negrees sand. The test results of normalizing process which is cooled in the room temperatura are : The hardness value decreased from 597.21 to 515.6 BHN; The tensile strength dereased from 1557 N/mm2 to 1307 N/mm2,, and the strain increased from 9,33 % to 12.07 %. The test result of normalizing process which is cooled in the 100 degree Celsius sand are : The hardness value decreased from 597,21 to 503.19 BHN; The tensile strength decreased from 1557 N/mm2 to 1291,37 N/mm2, the strain increased from 9.54 to 13.92 %.The conclusions of this reseach is the process of normalizing process which is cooled in a. 100 celsius degree sand give the best result closed to Basic material properties leaf spring SUP9.
Keywords: Baja SUP9, Welding SMAW, normalizing, brinell (BHN) Tensile strenght [Rm (s)]
Penulis: Bukhari, Nofriadi, Mulyadi
Kode Jurnal: jptmesindd110156

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Jp Teknik Mesin dd 2011