Effect of welding process parameters on embrittlement of Grade P92 steel using Granjon implant testing of welded joints

2020 ◽  
Vol 45 (16) ◽  
pp. 10189-10198 ◽  
Author(s):  
Nitin Saini ◽  
Rahul S. Mulik ◽  
Manas Mohan Mahapatra
Keyword(s):  
Process Parameters ◽  
Welded Joints ◽  
Welding Process ◽  
P92 Steel ◽  
Implant Testing

On-Line Detection of Friction Stir Welded Joints by High Temperature Phased Array Ultrasonic Inspection and Control of Weld Process Parameters

2017 ◽  
Author(s):  
Daniel Huggett ◽  
Muhammad Wahab ◽  
T. W. Liao ◽  
Ayman Okeil
Keyword(s):  
High Temperature ◽  
Process Parameters ◽  
Welded Joints ◽  
Phased Array ◽  
Welding Process ◽  
Inspection System ◽  
Friction Stir ◽  
On Line ◽  
And Control ◽  
Welding Processes

Non-Destructive Evaluation (NDE) of welded structures is essential in industry and manufacturing sectors. However, NDE techniques are limited when applied at high temperatures, which prevents usefulness for on-line real time inspection of welded joints. In this work, a high temperature (HT) inspection system was created utilizing Phased Array Ultrasonic Testing (PAUT), and tested on Friction Stir (FS) welded aluminum alloy joints. The system created in this work proves HT-PAUT is capable of determining defects during the welding process. Supplementing this work, a custom defect detection software was created to analyze S-Scan data to interpret when and where a defect occurs to provide defect indicator signals. These defect signals can be utilized for controlling the FSW process parameters to automatically correct if a defect is observed. The technology developed can be utilized as a platform for future automated welding processes and control for creating the next generation weld-NDE systems.

scholarly journals Forming and Properties of Friction Stir Welding Process for Dissimilar Mg Alloy

2015 ◽  
Vol 9 (1) ◽  
pp. 859-864
Author(s):  
Tielong Li ◽  
Zhenshan Wang
Keyword(s):  
Magnesium Alloy ◽  
Process Parameters ◽  
Welded Joints ◽  
Defect Formation ◽  
Base Material ◽  
Welding Process ◽  
Fracture Initiation ◽  
Line Defect ◽  
Influence Of Process Parameters ◽  
Friction Stir

For hot extrusions of magnesium alloy sheets, Dissimilar AZ80 and AZ31 were used, in which AZ80 was placed on advancing side and AZ31 on retreating side, using friction stir butt welding with different process parameters. Some defect-free welded joints with good weld surfaces could be obtained with some suitable welding conditions. The maximum tensile strength of welded joint which is 225.5 MPa can reach 98% that of the AZ31 base material. Influence of process parameters on defects, weld shaping and mechanical property were discussed systematically. And the microstructure of different zones was compared. The fracture of the welded joints takes place at the junction of mechanical heat affected zone and nugget zone in AZ31 magnesium alloy set retreating side, since existing difference in metallographic structure of alloy diversely suffered by heat, pressure and depositing impurities. Fracture initiation site may be the P line defect which should be eliminated, and the P line defect formation was analyzed.

scholarly journals The impact of microstructural non-conformities on microhardness of EN AW 5754 aluminium alloy welded joints made with the use of the TIG method

2018 ◽  
Vol 48 (1) ◽  
pp. 253-262
Author(s):  
Piotr Woźny ◽  
Józef Błachnio
Keyword(s):  
Aluminium Alloy ◽  
Process Parameters ◽  
Welded Joints ◽  
Welded Joint ◽  
Welding Process ◽  
Strong Link ◽  
Tomographic Method ◽  
The Impact

Abstract The article presents the impact of welding non-conformities on microhardness of EN AW 5754 aluminium alloy welded joints made with the use of the TIG method. The results of microhardness tests of welded samples made with various process parameters. The impact of the welding non-conformities disclosed with the use of a tomographic method on the welded joint microhardness were analysed. The studies showed a strong link between the participation of welding non-conformities, welding process parameters and microhardness of welds.

Autogenous Tungsten Inert Gas and Gas Tungsten Arc With Filler Welding of Dissimilar P91 and P92 Steels

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Chandan Pandey ◽  
Manas Mohan Mahapatra ◽  
Pradeep Kumar ◽  
N. Saini
Keyword(s):  
Mechanical Properties ◽  
Microstructure Evolution ◽  
Welded Joints ◽  
Welding Process ◽  
Postweld Heat Treatment ◽  
Inert Gas ◽  
P92 Steel ◽  
Gas Tungsten Arc ◽  
Δ Ferrite ◽  
Gas Tungsten

Creep strength ferritic/martensitic modified 9Cr-1Mo-V-Nb (P91) steel also designated as ASTM A335 and P92 steel are used for piping, cladding, ducts, wrappers, and the pressure vessel in Gen IV nuclear reactors. In the present investigation, a comparative study of the effect of autogenous tungsten inert gas welding (A-TIG) with double pass and multipass gas tungsten arc (GTA) welding with filler on microstructure evolution in the weld fusion zone and the mechanical properties of P91 and P92 steel welded joints was carried out. The microstructure evolution was studied in as-welded and postweld heat treatment (PWHT) condition. The study also focused on the evolution of δ-ferrite patches and their influence on the tensile properties of welded joints. PWHT was carried out at 760 °C with durations from 2 to 6 h. To study the effect of δ-ferrite evolution on mechanical properties, Charpy toughness, microhardness, and tensile tests were performed. The acceptable microstructure and mechanical properties were obtained after the 6 h of PWHT for A-TIG arc welding process while for GTA weld with filler wire, it was obtained after the 2 h of PWHT at 760 °C.

scholarly journals Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

2018 ◽  
Vol 8 (12) ◽  
pp. 2626 ◽  
Author(s):  
Hongjun Li ◽  
Jian Gao ◽  
Qinchuan Li
Keyword(s):  
Growth Rate ◽  
Fatigue Life ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Process Parameters ◽  
Welded Joints ◽  
Welding Process ◽  
Life Assessment ◽  
Fatigue Properties ◽  
Friction Stir

The application fields of friction stir welding technology, such as aerospace and transportation, has high safety requirements and fatigue is the dominant failure mode for weldments. It is of great significance to understand the fatigue properties of friction stir welded joints. This paper provides an overview of the fatigue mechanism, influencing factors, crack growth rate, and fatigue life assessment. It is found that the fatigue performance of friction stir welded joints can be affected by welding process parameters, test environment, stress ratio, residual stress, and weld defect. The optimized process parameters can produce high quality weld and increase the weld fatigue life. Laser peening is an effective post weld treatment to decrease fatigue crack growth rate and improve material fatigue life.

scholarly journals Managing the influence of microstructure defects on the strength of EN AW 5754 aluminium alloy welded joints executed with the TIG method

2018 ◽  
Vol 182 ◽  
pp. 02025
Author(s):  
Piotr Woźny ◽  
Józef Błachnio
Keyword(s):  
Aluminium Alloy ◽  
Process Parameters ◽  
Welded Joints ◽  
Welding Process ◽  
Inert Gases ◽  
Weld Strength ◽  
Tungsten Electrode ◽  
Welding Defects ◽  
Strong Relation ◽  
The Impact

The paper concerns the issue of the impact of welding defects on the strength of EN AW 5754 aluminium alloy welded joints, executed with the TIG welding method (tungsten inert gas, i.e., a method of welding with a non-consumable tungsten electrode shielded with inert gases). The article presents examples of operating damage to welded joints and discusses the factors impacting the weld quality. The strength test results of welding samples taken under different process parameters were presented. The impact of welding defects and non-conformities identified with a CAT test on the weld joint impact was analysed. The studies showed a strong relation between the presence of welding defects, welding process parameters and weld strength.

Sign in / Sign up

Export Citation Format

Share Document