Studi Lapisan Intermetalik Cu3sn Pada Ujung Elektroda Dalam Pengelasan Titik Baja Galvanis

Intermetallic Cu3Sn Phase Layer on Electrode’s Tip of Galvanized Resistance Spot Welding. A resistance spotwelding method is commonly used in automotive industries application. In a resistance spot welding method, the copperelectrode has a significant role as an electric current carrier for joining thin metal sheet. This research was focused onstudying the effect of tin layer at the electrode tip for joining galvanized steel sheet. The main variable of this researchis in the thickness of the intermetallic Cu3Sn layer. The result showed that the introduction of tin layer less than 1 μm inthickness on the electrode tip gives a comparable shear strength and nugget diameter distribution with the unplatedelectrode tip

Chinese Script vs Plate-Like Precipitation of Beta-Al9Fe2Si2 Phase in an Al-6.5Si-1Fe Alloy

The microstructure of a high-purity Al-6.5Si-1Fe(wt pct) alloy after solidification at various cooling rates was investigated. In most of the cases, the monoclinic beta-Al9Fe2Si2 phase was observed as long and thin lamellae. However, at a very slow cooling rate, Febearing precipitates with Chinese script morphology appeared together with lamellae. Further analysis showed all these Chinese script precipitates correspond also to the monoclinic beta phase. This finding stresses that differentiating second phases according to their shape may be misleading

Effect of Age, Length of Service and Education on Employee Productivity PT Jasa Raharja Medan

This study aims to examine the effect of age, tenure, and education on employee productivity, either partially or simultaneously. Direct testing and questionnaire distribution obtained a population of 48 people, followed by statistical correlation tests and simple regression. The partial hypothesis test obtained the value of Age (X1) tcount < t table or 0.996 < 1.201063 and significant obtained 0.325 < 0.05, Working Period (X2) obtained tcount value > ttable or 1.539 > 1.201063 and the relevant value obtained was 0.131 < 0.05 and Education (X3), the value of tcount < t table or 0.573 < 1.201063 and the relevant value obtained 0.570 < 0.05 on employee productivity (Y). After conducting the test, it was concluded that partially Age, Term of Service, and Education had a positive and relevant impact on the productivity of PT Jasa Raharja's Medan City employees. Overall Age, Working Period, and Education have a very positive and significant impact on the productivity of employees of PT Jasa Raharja Medan