The impact of groove edge temperature and heat input on the structure and hardness of the heat affected zone of steel 460 NL1 welded joint

Jovičić, Radomir; Sedmak, Simon; Ilić, Nada; Radović, Ljubica; Štrbački, Svetlana; Antić, Milica; Burzić, Zijah

doi:10.5937/zzk1803101j

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…As for the mechanical properties of the weld metal, they were previously determined during another experiment, which also provided the results of Vickers hardness tests. Thus, these values (yield stress -460 MPa, and tensile strength -690 MPa), were adopted based on work shown in [6]. Again, these mechanical properties corresponded to the expected range of values for the filler material, VAC 65.…”

Section: Experimental Test and Relevant Resultsmentioning

confidence: 99%

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Integrity and Life Assessment of Welded Joints Made of Micro-Alloyed High Strength Steels

Sedmak¹,

Sedmak

Grbović

et al. 2020

AMR

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Structural integrity and life of welded joints made of a micro-alloyed low-carbon fine-grained normalised high strength pressure vessel steel, P460NL1 is presented [1]. The researach performed within the scope of this topic involved a large number of experiments, including tensile and bending tests, hardness and toughness, as well as metallography and fractography tests, in order to determine the mechanical properties of the materials and the welded joints in detail, along with their microstructures and their influence on the obtained test results. Specimens cut out of a welded plate with dimensions of 500x500x14 mm were used for the experiments, whereas certain tests required the making of notches in the specimens, inside the heat affected zone, and this welded joint region was the focus of the research. Fatigue experimental tests were based on the assumption that fatigue crack growth rate changes depending on the regions through which the crack passed during its propagation. For this purpose, specimens used in toughness and fatigue tests were divided into four groups, depending on the part of the plate from which they were taken. Numerical calculations were performed using the extended finite element method (XFEM) [2]. Simulations were based on the experimentally determined values of Paris law coefficients, C i m [3-5], for every region through which the crack propagated during each test. Obtained results have indicated good agreement with the experimental ones, which verified the application of extended finite element method in this case.

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Section: Experimental Test and Relevant Resultsmentioning

confidence: 99%

“…Figure 2 shows the results for specimen 2, and table 1 shows the corresponding results for each measuring location. More details about this can be found in [6].…”

Section: Experimental Test and Relevant Resultsmentioning

confidence: 99%

Integrity and Life Assessment of Welded Joints Made of Micro-Alloyed High Strength Steels

Sedmak¹,

Sedmak

Grbović

et al. 2020

AMR

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“…Preheating temperature was determined using the Seferian formula [7], based on the so-called carbon equivalent, while taking into account thickness, hydrogen content (expressed in ml/100gr), and the heat input for root and filling passes. The final preheating temperature determined in this way was 50°C.…”

Section: Welding Procedures and Cooling Timementioning

confidence: 99%

Influence of Cooling Time t<sub>8/5</sub> on Impact Toughness of P460NL1 Steel Welded Joints

Sedmak

Aranđelović

Jovičić

et al. 2020

AMR

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The results of impact testing of welded joint specimens taken from a welded plate made of P460NL1 steel are presented in this paper, and analysed with regards to the cooling time t8/5, that was previously calculated. The aim was to determine how the cooling times that were measured, some of which were below the minimum required values, affected the toughness, in terms of total impact energy and its components, crack initiation and crack propagation energy. In addition, this analysis included the effects of temperatures measured at the opposite ends of the plate during the welding process, since this had also affected the cooling times for each welding pass. After observing the differences in total, crack initiation and propagation energy between the tested specimens taken from different parts of the welded plate, it was determined that the specimens from the part where the higher temperatures were measured had shown better, more uniform results, whereas the average total impact energy for specimens from both groups were very similar. It was also noticed that the ratio of crack propagation to crack initiation was more favourable (greater) in the case of specimens from the second group (with higher temperature), as the values of crack initiation energy decreased slightly and the crack propagation energy increased.

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“…First, due to the fact that the high values of hardness depend on the wrong heat input, which already supports the absorption of carbon and hydrogen when welding, and as a result of the environment in which the material is used. Reducing sulphur content can be used in the fight against hydrogen induced cracks (HIC) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Welding tehnology for steel P460NL2

Poser¹,

Runchev²,

Zdraveski³

2022

Zavariv zavar konstrukcije

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This paper presents the development of welding technology for P460NL2 steel with a thickness of 30 mm. The technology was developed for the purpose of producing housings in which the device PIG-Pipeline Inspection/Intervention Gauge intended for testing and maintenance of pipelines is installed. In this particular case, the housings were intended for cleaning pipelines for the transport of acid-aggressive gases. The material was selected in accordance with NACE MR0175/ISO 15156 and ASME BPVC IKS standards. The welding technology is made for butt joint, root pass with GMAW, and other layers filled with SAW. Preheating and heat treatment after welding were performed to restore the structure. Standard tests are conducted such as: metallography, hardness test, tensile test and toughness, and the results are presented and commented in this paper. In conclusion, the welding technology gives satisfactory results, but, in terms of meeting the specifics of the NACE MR0103 and MR0175 standards, it shows increased hardness in the transition zone, in the HAZ.

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The impact of groove edge temperature and heat input on the structure and hardness of the heat affected zone of steel 460 NL1 welded joint

Cited by 3 publications

References 2 publications

Integrity and Life Assessment of Welded Joints Made of Micro-Alloyed High Strength Steels

Integrity and Life Assessment of Welded Joints Made of Micro-Alloyed High Strength Steels

Influence of Cooling Time t<sub>8/5</sub> on Impact Toughness of P460NL1 Steel Welded Joints

Welding tehnology for steel P460NL2

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