STUDI EKSPERIMEN PENGARUH KUAT ARUS TERHADAP KEKUATAN TARIK DAN KEKERASAN HASIL LASAN LOGAM PIPA ALUMINIUM SERI 5000 (AlMg5)

Abstract

Welding technology is one part that can not be separated in manufacturing technology. In general,
welding can be interpreted as a metallurgical bond in a metal or alloy metal connection which is
carried out when the metal is liquid. Now welding is the implementation of a very important job in
production technology with metal raw materials. In this study aims to determine how the influence of
strong currents on mechanical properties in MIG welding. that is by changing the welding current
strength of 70 A, 90 A and 110 A and using a reverse polarity DC welding machine. After welding
with varying currents, tensile and hardness testing are carried out. From these stages it will be known
the extent of the strong influence of the flow of MIG welding results. The test results show that welding
with a strong current of 70 A has the highest average tensile strength compared to a current strength
of 90 A and 110 A that is equal to 121.25 N / mm2. Furthermore, for hardness testing, the highest
hardness data is found on the welding metal with a strong current of 70 A with a value of 96.6 HRB.
From the results of tensile testing and hardness testing, the current strength factor greatly influences
the results of welds (tensile strength and hardness). Here the 70 A strong current can produce better
welding strength than 90 A and 110 A.