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IJSTR >> Volume 6 - Issue 7, July 2017 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Examination Of Mechanical Properties And Weld Zone Of X70 Pipe Steel After Welding

[Full Text]

 

AUTHOR(S)

Zakir Tas

 

KEYWORDS

mechanical properties, micro alloy, pipeline, weldability, submerger arc welding, high strength steels, weld zone, microstructure

 

ABSTRACT

The demand for large diameter pipes in terms of their strength and toughness properties is increasing day by day. The quality and mechanical strength values of the steels, used in new gas pipeline projects, are gradually increasing. Today, high strength steels are used instead of the steels with low yield values. In this study, the micro-structure mechanical properties of the high strength X70 steel, used in the Trans Anatolian Gas Pipeline Project (TANAP), were investigated before and after the welding process and the weld zone was examined. The submerger arc welding process has been employed for the weld process. While the mechanical properties were determined by tensile, notched bend impact, bend and hardness measurements, the microstructures were examined by using optical microscope and scanning electron microscope (SEM). The radiographic and ultrasonic methods were employed in the non-destructive test of the weld zone.

 

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