The E-head is a specialized, semi-automated, weld head. It's purpose is to quickly butt-weld tubes during the replacement of the super-heater section of a coal fired power plant. The E-head has a narrow side clearance, a requirement of the application due to the tight spacing of the rows of tubing in the super-heater section. The head can be assembled from one side of the super-heater row. The travel, arc strike, surface following and oscillation of the head are automatic. The weld wire position is a quick touch adjustment made by the operator at the beginning of each pass. Development of this head allowed machine welds to be performed in clearances that previously required manual welds.