Pengaruh Preheat dan Thermal Tensioning Terhadap Sifat Fisis dan Mekanik pada Sambungan Las TIG Al 6061-T6
ABSTRACT: Aluminum 6061-T6 is
one the aluminum alloys which is widely used in engineering practice, such as
automotive industry, piping, tanks, aircraft and shipping, because of many
advantages including light weight, high tensile strength, corrosion resistant,
able to shape and good weldability. Welding process is widely used today. The
problem often encountered when using a welding method is the low strength of
welded joints compared with the parent metal and the presence of distortion,
especially for thin materials, due to residual stresses that arise during
welding process. High tensile residual stress in welded joints can lead to
brittle fracture, stress corrosion cracking, and accelerate the propagation rate
of fatigue.
This study aims to determine the effect of preheat, static thermal
tensioning (STT), and transient thermal
tensioning (TTT) on
the quality of
welding as indicated
by the test
of micro structure, hardness test, and tensile test of
TIG welded joints of Al 6061-T6. The results showed that the preheat, STT, and
TTT can change the size and shape of grains in the weld area and HAZ regions.
Preheat, STT, and TTT can increase the tensile strength and yield stress in the
weld area. The highest tensile strength occurs in the STT that is equal to 194
MPa, or increase by 43.5% compared to the tensile strength of the weld without
treatment. The highest yield stress also occurs in the STT that is equal to 154
MPa, or increase by 104.4% compared to the yield stress in the weld without
treatment.
Penulis: Yunaidi. Mochammad
Noer Ilman
Kode Jurnal: jptmesindd120264
