| Abstrakt: |
Welding is a process of joining two or more metal by melting some of the base metal. In the field of welding, there are many types of welding processes with different characteristics. GMAW, Gas Metal Arc Welding, is a type of welding process that is widely used in industry for joining metals. In the GMAW welding process, one of the determinants of the quality of the welding result is the shielding gas. Argon (Ar) and Carbon Dioxide (CO2) are shielding gases that is commonly used in the GMAW welding process. Ar and CO2, with different characteristics, protect the welding area from environmental influences and also improve the mechanical properties of the welded metal. This study aims to determine the effect of shielding gas CO2 and Argon on the mechanical properties of the welding results. The research methodology was carried out by making two welding specimens; the selected position is 1G; plate material is ASTM SA.36; the thickness of the plate is 8 mm; and the filler rod is A.518 ER 70S-6. Mechanical tests carried out are tensile test, hardness test, and bending test. The results showed that the shielding gas greatly affected the strength of the welding joint, where the tensile strength for specimens with CO2 shielding gas are higher than that with Argon, which were 49.71 kgf/mm2 and 44.71 kgf/mm2 respectively. And, the strain values are 17.03% and 9.70%, respectively. The hardness test value for specimens with CO2 shielding gas is lower than that with Argon, namely 63.40 HRC and 67.60 HRC, respectively. The bending strength values for specimens with CO2 shielding gas are higher than that with Argon, which are 74.77 kgf/mm2 and 78.16 kgf/mm2, respectively. [ABSTRACT FROM AUTHOR] |
