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Hybrid Laser – Arc Welding Applied in Longitudinal Joints for Hydrocarbon Conduction Pipes

Published online by Cambridge University Press:  11 May 2015

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Abstract

In this paper the effect of hybrid laser arc welding on longitudinal joints for pipes of 1.27cm thick is investigated. For the investigation, an API X70 steel was welded with the HLAW process and then subjected to tensile, bending and micro hardness tests under standards for pipe manufacturing. Images of the weld seams were taken to observe the structure and size of the weld zones. Analysis was made by light microscopy to determine the phases present in the weld zones and to observe if there is a variation of grain size in the weld zones that adversely affects the mechanical properties of the API X70 steel. Results show that the mechanical properties of the joints meet the requirements for their use in pipe manufacturing; one reason is the low thickness of the weld zone that barely affects the original properties of API X70 steel. Also the presence of bainite in the microstructure of weld zones provides resistance to the joints.

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Copyright
Copyright © Materials Research Society 2015 

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References

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Hybrid Laser – Arc Welding Applied in Longitudinal Joints for Hydrocarbon Conduction Pipes
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