The welding process of X65Q+CRA625 clad composite pipe was analyzed in this paper.The welding method of this process was GTAW.According to the special situation that the base material was high-strength X65Q pipeline steel and the composite layer was nickel based material,a reasonable preheating/interpass temperature was formulated.According to the operation characteristics of welding materials,the key points of welding were summarized.Through the test of welded joint,the rationality of this welding process was determined to meet the welding quality requirements of the composite pipe.
X65Q+CRA625 clad composite pipeInconel 625 nickel base alloywelding processkey points of welding
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