Study on Welding Procedure of Gas Metal Arc Welding using Cored Wire.

The setting operation of suitable welding condition is very important in welding procedure. In this study, paying attention to the volume of deposited metal for unit welding length (Vw), the setting method of the welding condition in GMA welding process with flux cored wire is proposed and its propriety is investigated. Influence of Vw and deviation of arc center on bead formation, too, are investigated. The unifying method of welding condition using Vw can select the suitable conditions easily and widely. In above mentioned welding process, it is advisable to select the welding condition with high current and high speed. It is effective to consider Vw in regard to the maximum welding speed without undercut. In the case of horizontal fillet weld as small Vw as 6 mm leg length, it has a broad allowable range to aim the arc center at 0.5 mm in front of root. In large Vw horizontal fillet weld, the process that arc center aims at 3-4 mm in front of root is effective to expand to the permitted limit of deviation of arc center.