Abstract
The effects of manual tungsten inert gas welding (GTAW) and automatic GTAW on the microstructure and mechanical properties of L360QS/N08825 composite pipe welded joints were investigated. The welded joints obtained by the two welding methods were subjected to tensile, bending, hardness and low-temperature impact test. The fracture morphology, chemical composition and microstructure were observed and analyzed by scanning electron microscope and optical microscope, respectively. The results showed that welded joints with good microstructure and mechanical properties can be achieved by both the two welding methods. Compared with manual GTAW, the microstructure of automatic GTAW welded joint is smaller and more uniform and the mechanical properties are improved. The two welding methods can play their respective advantages in different working environments and welding positions.
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