PENGARUH PREHEAT DAN THERMAL TENSIONING TERHADAP SIFAT FISIS DAN MEKANIK PADA SAMBUNGAN LAS TIG AL 6061-T6

Yunaidi Yunaidi, Mochammad Noer Ilman

Sari


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.

Key word : preheat, static, transient, thermal tensioning, TIG, Al 6061-T6, mechanical properties


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DAFTAR PUSTAKA

Aa, E.M., Murugaiyan, A., 2006, Influence of Trailing Heat Sink on the Welding Residual Stress Distribution, ESRF.

Barsanescu, P.D., Leitoiu, B., Goanta, V., Cantemir, D., Gherasim, S., 2011, Reduction of Residual Stresses Induced by Welding in Monel Alloy Using Parallel Heat Welding, International Journal of Academic Research vol. 3 no.1. part II, Baku, Azerbaijan.

Burak, Ya.I., Besedina, L.P., Romanchuk, Ya.P., Kazimirov, A.A. and Morgun, V.P., 1977, Controlling the Longitudinal Plastic Shrinkage of Metal During Welding, Avt. Svarka.

Burak, Ya.I., Romanchuk, Ya.P., Kazimirov, A.A. and Morgun, V.P., 1979, Selection of the Optimum Fields for Preheating Plates Before Welding, Avt. Svarka.

Chakrabarti, D.J., Laughlin, D.E., 2004, Phase Relation and Precipitation in Al-Mg-Si Alloys with Cu Additions, Progress in Materials Science

Guo, S., Li, X., 2001, Welding Distortion Control of Thin Al Alloy Plate by Static Thermal Tensioning, Journal Materials and Science Technology vol. 17 no. 1.

JIS, 1973,”Non Ferrous Metal“, Japanese International Standar.

Li, J., Q Guan, Q., Shi, Y., Guo, D., Du, Y., Sun, Y., 2004, Studies on Characteristics of Temperature Field During GTAW with a Trailing Heat Sink for Titanium Sheet, Journal of Materials Processing Technology, vol. 147, pages 328-335.

Masubuchi, K., 1980, Analysis of Welded Structures : Residual Stresses, Distortion, and their Consequences, Pergamon Press.

Preheating of Material, www.bocworldofwelding.com.au


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