PENGARUH POSISI HORIZONTAL (2G), VERTIKAL (3G) DAN OVERHEAD (4G) PADA PENGELASAN SMAW GERAK SPIRAL TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO BAJA ST37

AHMAD ADISON, DADANG (2019) PENGARUH POSISI HORIZONTAL (2G), VERTIKAL (3G) DAN OVERHEAD (4G) PADA PENGELASAN SMAW GERAK SPIRAL TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO BAJA ST37. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

At SMAW process, welding position is one of the important parameters because it affects physical properties which in turn will affect the mechanical properties of the material. This study aims to investigate the effects of 2G horizontal, 3G vertical, and 4G overheads position in spiral motion welding SMAW to the tensile strength and micro structure of ST37 steel. The treatment used in this research was welding with different welding positions using SMAW welding with E7016 electrodes and open V seam at an angle of 60º. Position variations used were 2G horizontal position, 3G vertical position, and 4G overhead position. The material used was ST37 steel which belongs at low carbon steel group with less than 0.3% of carbon element. Tensile test and micro structure test were used at the welding product according to ASTM E8 standards. The results showed the highest tensile strength obtained from the vertical 3G position variant with average value of 33.08 kgf/mm². Based on the micro structure test on the welding vertical 3G position, it showed that the acicular ferrite micro structure dominates the entire area and uniformly locked the grain boundary ferrite micro structure. Acicular ferrite micro structure is the micro structure expected from each welding process because the structure is an interlocking structure that is able to hold the rate of crack propagation. According to the results of the study it can be concluded that the difference in welding position does not significantly affect the value of the tensile strength and the formation of the welded metal microstructure in ST37 steel

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