Q2 (a) An Investigation of the CaCO3-CaF2-K2SiO3- SiO2-Fe flux system using the Submerged Arc Welding Process on HSLA-10

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Q2 A An Investigation Of The Caco3 Caf2 K2sio3 Sio2 Fe Flux System Using The Submerged Arc Welding Process On Hsla 10 1 (175.06 KiB) Viewed 41 times

Q2 (a) An Investigation of the CaCO3-CaF2-K2SiO3- SiO2-Fe flux system using the Submerged Arc Welding Process on HSLA-100 and AISI-1081 Steels was conducted in a series of experiments. In this investigation, the welding fluxes with differing chemical compositions were prepared. Several welds using each flux were made on AISI-1018 steel base metal. The ANOVA results of hardness measurements (in Brinell scale) of five welds using each of four fluxes are presented in Table 2. Source of variation Flux Error Total Table 2: ANOVA of hardness measurements df Sum of squares (SS) Mean of 3 16 19 1023.6 608.3 (i) Complete the ANOVA table in Table Q2(a) (ii) By using a = 0.05, can we conclude that the flux types have significant influence on the Brinell hardness? Prove your answer. VamNE (8 marks) (b) The data in the following Table 3 represent the number of hours of relief provided by five different brands of headache tablets administered to 15 subjects experiencing fevers of 38-C or more. Perform the analysis of variance and test the hypothesis at the 0.05 level of significance that the mean number of hours of relief provided by the tablets is the same for all five brands. Discuss the results. (8 marks) Table 3: Hours of relief by different brands of headache tablets Relief duration (in hour) Tablet Brand A B с D E 5.2 4.7 8.1 7.1 8.2 2.2 4.1 9.3 124- 9.1 squares (MS) 3.2 Firmo 1846 Fo 5.8 (4 marks) 2.4 3.4 7.1 6.6