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Information Journal Paper

Title

An investigation on the effect of preheating temperature on the weld toughness of API 5L X65 steel

Pages

  77-93

Abstract

 This Research has been Conducted to Investigate the Effect of Preheating temperature on the Weld toughness of API 5L X65 Carbon Steel Material. Since the API 5L X65 PSL2 Micro Alloyed Material Is Widely Used in Oil and Gas Refinery Industries, In This Research, We Tried to Investigate the Effect of Preheated Temperature on the Welding Toughness of the Mentioned Steel. In This Research Two Steel Pipes with a Diameter of 46 Inches and a Thickness of 36. 5 mm Were Tested. The Pipes Were Welded With an Arc Welding of Tungsten Electrodes With Neutral Protective Gas (GTAW) and Shield Metal Arc Welding (SMAW) Combination Process Using a Filler Metal ER 80S-G and Electrode E8018-G. Before the Welding Operation, They Were Preheated at a Minimum Temperature of 100 Degree Celsius and a Maximum Temperature of 250 Degree Celsius and Controlled. Then, Charpy Impact Test Was Used to Investigate the Effect of Preheating temperature on Toughness and Absorption of Welding Energy and a Metallographic Test Was Used to Investigate the Macroscopic and Microstructure of This Steel. Also in This Research, a Hardness Test Was Used to Determine the Hardness of Weld Metal. Based on the Obtained Result, the Controlled Preheated Temperature Due to Mild Cooling rate Increased the Weld toughness Properties and The Creation of Coaxial Fine Grains in the Crystalline Structure of the Steel Mentioned and Conversely, Inappropriate and Uncontrolled Preheating temperature May Increase the Hardness and Strength and Reduce the Amount of Toughness and the Formation of Coarse Grained Columns in the Crystalline Structure Due to the High Cooling rate. Base on this, it is Concluded That the Weld Metal with a Controlled Preheat Temperature has a Higher Toughness and Resistance to Impact, While Weld Metal with an Uncontrolled Preheat Temperature has Less Toughness and is More Sensitive to Cracking, Especially Hydrogen Cracks.

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    APA: Copy

    Saberpour, P., & Golshokouh, I.. (2020). An investigation on the effect of preheating temperature on the weld toughness of API 5L X65 steel. JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN, 5(2 ), 77-93. SID. https://sid.ir/paper/269243/en

    Vancouver: Copy

    Saberpour P., Golshokouh I.. An investigation on the effect of preheating temperature on the weld toughness of API 5L X65 steel. JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN[Internet]. 2020;5(2 ):77-93. Available from: https://sid.ir/paper/269243/en

    IEEE: Copy

    P. Saberpour, and I. Golshokouh, “An investigation on the effect of preheating temperature on the weld toughness of API 5L X65 steel,” JOURNAL OF WELDING SCIENCE AND TECHNOLOGY OF IRAN, vol. 5, no. 2 , pp. 77–93, 2020, [Online]. Available: https://sid.ir/paper/269243/en

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