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Zeng H.,Petrochina | Wang C.,Petrochina | Yang X.,Langfang Dongfang Polytechnic Institute | Wang X.,Petrochina | Liu R.,Petrochina
Natural Gas Industry | Year: 2014

In order to achieve automatic welding of pipes under complex operation environment, an automatic welding system was developed by use of all-position self-shielded flux cored wires due to their many advantages, such as all-position weldability, good detachability, arc's stability, prevention of welding defects like incomplete fusion, unnecessary protective gases for welding nor need of any protection against wind when the wind speed is < 8 m/s. This system consists of a welding carrier, guide rail, an auto-control system, welding source, wire feeder, and so on. Welding experiments of this system were performed on the X80 pipeline steel to determine proper welding parameters. The welding technology comprises root welding, filling welding and cover welding and their welding parameters were obtained from experimental analysis. On this basis, the mechanical properties tests were carried out on welded joints in this case. Results show that this system can help improve the continuity and stability of the whole welding process and the welded joints' inherent quality, appearance shape, and mechanical performance can all meet the welding criteria for X80 pipeline steel; with windbreak fences unnecessarily needed, the overall welding cost will be sharply reduced. Meanwhile, more positive proposals were presented herein for the further research and development of this self-shielded flux core wires. Source

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