Bimetallic tubulars with highly corrosion resistant inner liners can be utilized for reducing drill pipe corrosion in super sour well environments containing elemental sulfur. However, when the bimetallic tubulars are joined, alloying of the two distinct materials comprising the bimetallic tubular may occur and significantly reduce the bimetallic tubular's corrosion resistance and strength at the point of the weld. What is needed in the art is a method for welding and a weld configuration which preserves the continuity of the corrosion resistant inner liners of bimetallic tubulars and which avoids alloy formation of the different materials of the tubular layers at the weld joint.
The welding method and weld configuration of the instant invention advantageously avoid alloying of the discreet materials comprising the layers of the bimetallic tubulars when the weld joints are formed. Thus the possibility of decreased corrosion resistance and strength resulting from alloying of the two materials composing the bimetallic tubular in the weld configuration is eliminated.