Choice of arc length and power level settings do much to determine weld quality

December 2013 - Becoming a good welder is only possible through training, most especially training as the student is practicing welding. Such training is guided by a program where the trainee is asked to perform as a beginner. Additional knowledge is steadily gained through instruction in welding theory and through various welding exercises.

The interaction among the torch as the welding tool, the electric current, the shield gas, welding wire, and the gap between the welding wire and the workpiece determines whether the welder creates a weld seam that is scattered and burned in or an attractive, perfect weld seam.

The effect of arc length on welding is both predictable and within the welder’s control. A successfully completed weld seam is the result of the correct setting range of voltage relative to the current and weld wire.

The accompanying drawings illustrate the situation when the welding wire, under the effect of the shield gas and the electric current, establish the arc. They can be applied to understand some basic ideas in learning how to use the torch, weld wire, voltage and current in welding and the effect these choices have on the quality of the weld seam. FFJ

Udo O. J. Huff is an independent consultant with project experience in machine building, welding engineering, training and development. He holds Master of Education and Bachelor of Science in Technology degrees from Bowling Green State University. Questions or comments? E-mail uhuff@sbcglobal.net.