ANALISIS VARIASI PRODUK ELEKTRODA E7018 DAN KUAT ARUS PADA PENGELASAN SMAW TERHADAP HASIL RADIOGRAPHY, KOMPOSISI KIMIA WELD METAL, DAN SIFAT MEKANIK

Abstract

During the welding of pipe racks at a private fabrication company, there was a change in the use of electrode products in SMAW welding (Shielded Metal Arc Welding) for welding carbon steel materials, from using E7018 electrodes from Product K to those from Product W, which has no specified current limits. Based on the problem above, this research was carried out using variations of the E7018 electrode product from product K, product N, and product W. The variations current strength used 100 A and 120 A using SMAW welding with testing in the weld metal. In radiographic testing four specimens exhibited welding defects. In chemical composition testing there were differences results of the chemical composition E7018 electrode due to differences in electrode products. In tensile testing product W showed increased tensile strength if increased current. In Impact testing product K and poduct N showed increased impact energy if increased current. Based on the results of the tests that have been carried out, it can be concluded that the Electrode E7018 from product N is recommended due to its superior quality compared to product W and its more economical price relative to product K which almost the same product quality.