Effect of Current, Travel Speed and Wire Speed Concerning Hardness on Carbon Steel With GTAW Welding

Autor: Riki Sanjaya
Rok vydání: 2017
Druh dokumentu: 學位論文 ; thesis
Popis: 105
Technology in welding is growing rapidly where to improve the welding results, which aims to determine the hardness of a material as a result of the welding process. The material used is carbon steel because carbon steel is widely used in the industry, especially in the shipping industry. This experiment uses the Gas Tungsten Arc Welding (GTAW) process. GTAW Welding or more popularly called Tungsten Inert Gas (TIG) is one type of electric arc welding with gas guard. To produce an electric arc, an unused electrode is made of tungsten or alloyed metal which has a very high melting point. In this Research have purpose to know how big is the effect of variation of welding speed by using GTAW welding on carbon steel then used hardness test on specimen and calculation of welded specimen with variation of electric current 80 and 110 ampere, travel speed 15 and 17 cm/s, Wire speed 3.5, 4, 4.5 cm/s. In this research was done measurement of metallography, microstructure, SEM and XRD. For metallography testing to find out the grain size of basemetal, HAZ, weld metal and Non-destructive Testing (NDT) know the hardness of material in basemetal, HAZ, and for XRD to know the phase of the material. From the result experiments, For measurement of metallography, it is known that the smallest grain size is in basemetal, then HAZ and grain size is the largest in weld metal. At the time of welding process takes place in the material ferrite material progress. In the HAZ and weld metal areas, as for hardness testing on microhardness, the area with the lowest strength is basemetal with an average of 170 ~ 205 HVN, then the second strongest area is HAZ with an average number of 205 ~ 235 HVN, the strongest is the Weld metal area with average number 230 ~ 280 HVN.
Databáze: Networked Digital Library of Theses & Dissertations
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