Abstract

Advancement in technology demands the joining of het- erogeneous metals of low and high-carbon steel grades. In this investigation, AISI1018 low and AIS4340 medium car- bon steels were welded to form a heterogeneous thin metal joint using the Manual Metal Arc Welding (MMAW) method. Experimental variations of welding current, electrode posi- tion, and weld orientation are selected as the MMAW pa- rameters. The trials are planned using the Full Factorial De- sign (FFD) and the trial results are analysed using Analysis of Variance (ANOVA) and regression methods. A computerized tensile testing machine (TM2101N) was used to test the ten- sile strength of the welded specimens that were prepared in accordance with the ASTM E646 –98 standards. The predic- tion model for tensile strength was generated based on re- gression analysis. The ANOVA and prediction model helped in studying the effect of the MMAW parameters.