The formation of porosity in CO, laser welding of brazed Al alloy plate was investigated . In order to evaluate the influence of brazing layer on the porosity formation, two types of specimens were welded . One was the brazed plate in which two plates were bonded, and the other was the Al plate without brazing layer. The obtained results are as follows .(1) The number of porosity was less in the weld fusion zone of Al alloy plate than that of the brazed plate . It was made clear that melting the brazing layer caused the porosity formation.(2) The joint shape, in which the brazing layer in weld groove was removed, was significant for reducing the porosity .(3) High speed welding was effective for reducing the porosity in the brazed plate. It was suggested that high speed welding narrowed the melted zone of brazing layer, leading to the reduction in porosity .
This report relates to a fusion upset welding method effected using molten slag as resistance-exothermic medium.It is known that most of conventional welding methods effect their welding by means of molten deposit metal formed in a number of ways, but it may also happen that , in the case of welding ordinary and special steels, mechanical properties of deposited metal invariably drop to a considerable extent under all circumstances.On the other hand, the resistance butt welding and flash butt welding methods in which no metal is deposited, necessitate provision of large capacity power source facilities, so that it is difficult to weld a large cross section using normal welding facilities in these welding systems .
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