Abstract
The effect of the addition of iron powder to agglomerated flux on welding performance and the optimum welding conditions for high heat input welding were investigated. The main conclusions obtained follow :
(1) The addition of iron powder to flux increases the deposition rate and improves welding operability.
(2) The arc of leading electrode was generated at a lower point of molten metal between leading and trailing electrodes rather than at its top. The penetration depth was influenced by the ratio of the area of groove to that of molten metal on which leading arc is generated.
(3) The cross sectional profile of the bead was influenced by the current ratio of the trailing electrode to that of the leading. The optimum ratio for avoiding weld defects ranged between 0.70 and 0.80.
(4) The flux containing iron powder together with the selection of optimum welding conditions enabled the tandem wire one pass submerged arc welding for 60 mm thick plates.
