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The welding is the process of connecting two metals, where factors that&#x0D;influence are current, voltage, plate thickness, gap shape and heating temperature&#x0D;of the electrode. The heating of this electrode aims to stabilize the arc arising&#x0D;during welding.&#x0D;The objective of the study was to determine the maximum hardness of low&#x0D;carbon steel welding with E 7018, with temperature of electrode storage at&#x0D;temperature 50, 75 and 100 ° C. Determine the maximum change in the hardness&#x0D;of the welded by using heated electrodes preheated to an initial temperature of 50,&#x0D;75 and 100 ° C. Compare its hardness to the standard. The specimen-making&#x0D;method is based on JIS Z 3121, further data are compared against the standard.&#x0D;The result of maximum hardness value for slit I is 175HV and for slit V&#x0D;264HV in weld area with temperature 75 ° C, hardness change of 33HV for&#x0D;temperature 100 °C.

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