The Strength Material Welding Dissimilar of Method GTAW AISI 1045 With HSS for Application Milling Tool
Keywords:
Welding Dissimilar, GTAW, Baja AISI 1045, HSS, Mechanical PropertiesAbstract
Dissimilar welding is a permanent joining of two dissimilar materials as the application of this welding is used in milling tools that receive a large load when used. It is certain that there is a change in the microstructure between the HAZ (Heat Affective Zone) regions, and causes a decrease in the strength of the material, because residual stresses, defects, and cracks due to dissimilar welding will become a problem in itself. This study will connect two different materials between AISI 1045 and HSS (High Speed Steel), using the GTAW (Gas Tungsten Arc Welding) welding method. Welding results from tensile strength, hardness and microstructure inspection as well as calculating grain size in the weld metal, HAZ and base metal areas are the focus of the analysis.
This dissimilar welding will compare three welding amperes that is, ±110A, ±167A and ±225A. This amperage is used based on the welding results that have been carried out for both materials with the AWS standard for circular welding of solid round materials such as the shape of a milling tool. GTAW welding method is very good and strong, but the hardness of the weld metal is large and will cause brittleness. The difference in hardness between weld metal and HAZ is significant due to the rapid heat input resulting in failure in the area between weld metal and HAZ.
Tensile test results for amperage ±110A tensile strength 84.70 kgf/mm2, the hardness is 665.58 HV in the HAZ area of HSS material. Examination of the microstructure in this area has austenite, martensite and carbide phases, it looks less than ±167A of amperage welding, the results of the hardness test are 774.70 HV in the HAZ area of HSS material so that this area will be more brittle. The smaller the grain size, the higher the hardness. Selection of dissimilar welding filler metal produces good joint strength. While the amperage welding of ±225A broke on welded metal with a tensile strength of 43.41 kgf/mm2, the hardness in the HAZ area was made of HSS with a hardness of 772.37 HV. The smallest hardness value is in the base metal area of AISI 1045 material with a hardness of 264.45 HV. The difference in hardness is much different between HSS and AISI 1045, indicating the use of filler metal with poor connection strength for large amperes.
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Copyright (c) 2023 Toto Triantoro B. W., P.Y.M Wibowo Ndaruhadi
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