Abstract
The technology of the manufacturing industry is developing rapidly, where the rapid development of this technology cannot be separated from the welding field. In the welding process, thermal heat is used until the material melts, the heat change will also cause changes in the structure, stress and also deformation of the material. This is because the more carbon elements are captured, the more martyred structures are formed. This causes an increase in the value of hardness and tensile strength values in the material. The purpose of this study was to determine the effect of the temperature of the cooling medium oil, salt water, water. dromus, and free air in GMAW welding on the tensile test of ST 60 steel. To determine the effect of cooling temperature medium of Oil, Salt Water, Dromus Water, and Free Air on GMAW welding toward the tensile test and hardness test of ST 60 steel. Several means used for testing are calculating the tensile stress Mpa and HVN hardness. This research method used the experimental method. The GMAW welding process variations of coolant were used, such as oil, salt water, dromus water, and free air with a time of 25 minutes and electic current of 100 A. The type of seam used was a V type with angle of 30o. The tests carried out were tensile and hardness test. The highest average value of the tensile stress from the the salt water coolant specimen was 490.23 Mpa. The highest average value of the tensile strain from free air specimens was 35.45 Mpa. The average value of HVN hardness from Oil specimens was 208.3 HVN, salt water was 231.0 HVN, Dromus water was 215.5 HVN, and free air was 228.0 HVN. From the average value of HVN hardness, the highest value observed was the salt water specimen with 231.0 HVN.
Highlights
where the rapid development of this technology cannot be separated from the welding field
thermal heat is used until the material melts
This is because the more carbon elements are captured
Summary
Data Pengujian Tarik Pada Hasil Pengujian masing-masing specimen variasi pendinginan Oli,Air garam,Air Dromus,Udara bebas.yang di lakukan pada penelitian ini menggunakan 12 sepesimen setelah dilakukan pengujian tarik dengan menggunakan mesin uji tarik.Maka di dapat beberapa data di antaranya adanaya tegangan tarik dan Regangan, pada hasil pengujian tersebut bisa dilihat pada tebel 1. Perhitungan nilai kekuatan Tegangan Tarik ratarata sepesimen Oli dengan waktu Pendinginan 25 menit dan kuat arus 100 A menggunakan persamaan di dapat hasil sebagai berikut :. Dengan waktu 25 menit dan kuatarus 100 A, dari hasil data Grafik tersebut juga menunjukan nilai rata – rata tegangan tertinggi adalah variasi pendinginan air garam dengan nilai (Mpa) sebesar (490,23). Hasil pengujian tarik spesimen variasi pendinginan oli, air garam, air dromus, udara bebas dengan waktu 25 menit dan kuat arus 100 A.
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