ANALISIS KOMBINASI ELEKTRODA PADA PENGELASAN DISSIMILAR MATERIAL SA 516 GR70 DENGAN SA 240 TYPE 316L DENGAN BUTTERING LAYER PROSES PENGELASAN FCAW TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO

Abstract

Dissimilar welding is a technique used to joint two different metal materials. In
this research using SA 516 GR70 material with SA 240 type 316L with FCAW welding
process. This research was carried out a welding process with a buttering layer using a
combination of E309 electrodes with filler metal using E71T and E316L with a comparison
of a combination of E312 electrodes with filler metal using E71T and E316L. The
combination variations were tested visually, tensile, bending, hardness, and metallography.
In visual testing, no defect were found in the test specimens. In tensile testing the buttering
layer E309-E71T has the highest tensile strength of all other test specimens which is 639.16
Mpa. In the bending test of all test specimens, only buttering layer E309-E316L passed thye
acceptance requirements. In the hardness test, the highest average in the weld metal is
found in buttering layer E312-E71T with an average value 302.35 kgf/mm2
. In macro
testing the HAZ width of the E312 buttering electrode is wider than E309. In micro testing
in each specimen there are ferrite, pearlite, delta-ferrite, and austenite structures.