Designing Experiments to Affect Post Weld Heat Treatment Parameters: Using the Full Factorial Design in Inconel X-750 Welds

2013 ◽  
Vol 711 ◽  
pp. 188-194
Author(s):  
Prachya Peasura ◽  
Bovornchok Poopat
Keyword(s):  
Heat Treatment ◽  
Factorial Design ◽  
High Hardness ◽  
Post Weld Heat Treatment ◽  
Solution Temperature ◽  
P Value ◽  
Gamma Prime ◽  
Time Interaction ◽  
Hardness Increase ◽  
Weld Heat

Alloy X-750 also has excellent properties down to cryogenic temperatures high stability and strength at high temperatures. This reason the alloy is used in manufacturing of gas turbine hot components. The research was study the effect of post weld heat treatment (PWHT) parameter on hardness and microstructure. The specimen was Inconel X-750 grade sheet of 2.8 mm thickness. This 23factorial design was used in experimental various post weld heat treatment at 705 and 845°C for 20 and 24 hour including solution temperature at 1,000 and 1,150°C. The welded specimens were tested by hardness testing in fusion zone (FZ) and heat affected zone (HAZ). The result showed that both of solution temperature, PWHT temperature and PWHT time interaction on hardness of FZ and HAZ at 95% confidential (P value < 0.05). The PWHT temperature and PWHT time interaction effect was the largest. The factor showed in the hardness increase with the low level (-1) of PWHT temperature and PWHT time for the hardness while it trended decrease for the solution temperature. The microstructure was the γ amount and small size would result in high hardness. Experimental results showed that the solution temperature at 1,150°C, PWHT temperature 705°C PWHT time of 20 hours provided intensity of gamma prime (γ) and MC carbide resulting in higher hardness both in FZ and HAZ.

Application of Full Factorial Design for Post Weld Heat Treatment Parameters on Duplex Stainless Steel UNS31803

2013 ◽  
Vol 711 ◽  
pp. 178-182
Author(s):  
Prachya Peasura ◽  
Narasak Duangsrikaew ◽  
Santirat Nansaarng
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Factorial Design ◽  
Duplex Stainless Steel ◽  
Post Weld Heat Treatment ◽  
Full Factorial Design ◽  
Ferrite Content ◽  
P Value ◽  
Full Factorial ◽  
Weld Heat

In this research, the post weld heat treatment (PWHT) of duplex stainless steel (DSS) was study. The PWHT process can be affected by differing parameters. The specimen was duplex stainless steel UNS31803 grade sheet of 10 mm thickness. The PWHT parameters were analyzed by application of full factorial design. The factors used in this study were PWHT temperature of 650, 750, and 850๐C with PWA time of 1, 2, 4 and 8 hours. The welded specimens were tested with micro vickers hardness and ferrite content testing according to ASTM E3-11 code. The result showed that both of PWHT temperature and PWHT time interaction on hardness and ferrite content for 95% confidential (P value < 0.05). The factor in most effect of hardness was the PWHT temperature of 850๐C and PWHT time for 4 hour at the hardness of 277.73 HV. The ferrite was the most ferrite content for 77.39% resulted in corrosion resistance due to suitable of PWHT temperature 750๐C and PWHT time for 8 hour. Finally, form PWHT process with the information was used choosing the appropriate for PWHT parameters to duplex stainless steel welds.

Effect of Post Weld Heat Treatment on Carbon Steel AISI 1050 in Heat Effected Zone

2013 ◽  
Vol 650 ◽  
pp. 612-615
Author(s):  
Prachya Peasura ◽  
Lersak Sumarn
Keyword(s):  
Heat Treatment ◽  
Carbon Steel ◽  
Treatment Time ◽  
Treatment Temperature ◽  
Post Weld Heat Treatment ◽  
Heat Treatment Time ◽  
P Value ◽  
Fine Grain ◽  
Steel Aisi ◽  
Weld Heat

The research was study the effect of post weld heat treatment parameters on microstructure and hardness in heat affected zone. The specimen was carbon steel AISI 1050 which thickness of 6 mm. The experiments with full factorial design. The factors used in this study were post weld heat treatment(PWHT) temperature of 500, 550, 600, 650 and post weld heat treatment time of 10 and 15 hour. The welded specimens were tested by tensile strength testing and hardness testing according to ASTM code. The result showed that both of post welds heat treatment temperature and post weld heat treatment time had interaction on hardness at 95% confidential (P value < 0.05). A factor affecting the hardness was the most PWHT temperature 550 ๐C and PWHT time 10 hr. of 279 HV. Microstructure can be concluded that low PWHT temperature and time effect on temper martensite with a coarse grain and martensite scattered throughout. Martensite was a smaller and greater fine grain, the ferrite and the volume decrease due to a higher temperature.This research can be used as data in the following appropriate PWHT parameters to carbon steel weld.

Examination of Coil Pipe Butt Joint Made of 7CrMoVTiB10-10(T24) Steel After Service

2012 ◽  
Vol 57 (2) ◽  
pp. 553-557 ◽  
Author(s):  
G. Golański ◽  
P. Gawień ◽  
J. Słania
Keyword(s):  
Heat Treatment ◽  
Grain Boundaries ◽  
Contact Area ◽  
High Stability ◽  
Welded Joint ◽  
High Hardness ◽  
Butt Joint ◽  
Post Weld Heat Treatment ◽  
Weld Heat

Examination of Coil Pipe Butt Joint Made of 7CrMoVTiB10-10(T24) Steel After Service The paper presents the results of examination of coil pipe butt joint made of 7CrMoVTiB10-10 steel (T24). Tested joint was in service for approximately 12 000 hours at the temperature of 540°C and pressure of 5.48MPa. Tests have revealed that the structure of all regions of the homogenous welded joint are correct and without any welding imperfections. Operation of the weld contributed mainly to advantaged precipitation of carbides especially on grain boundaries - frequently in the contact area of three grains' boundaries as well as in the form of continuous network of precipitates. The measurement showed high hardness of the weld, what indicates high stability of the microstructure. It makes possible to find that post-weld heat treatment is indispensable.

scholarly journals Optimization of Welding Parameters for Repairing NiAl Bronze Components

2012 ◽  
Vol 706-709 ◽  
pp. 2980-2985 ◽  
Author(s):  
Hui Jun Li ◽  
Daniel Grudgings ◽  
Nathan Larkin ◽  
John Norrish ◽  
Mark Callaghan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Weld Metal ◽  
High Hardness ◽  
Post Weld Heat Treatment ◽  
Welding Parameters ◽  
Marine Application ◽  
Wide Range ◽  
Marine Applications ◽  
Welding Procedure ◽  
Weld Heat

The objective of this study is to determine an optimal welding procedure that can be implemented to repair damaged Nickel Aluminium Bronze (NAB) components. NAB is commonly used in marine applications where components are subject to a constant corrosive environment and high stresses. Research into ideal NAB microstructure for a marine application, was performed in order to gain a baseline for experimental analysis of potential welding procedures. The results indicated that the welding repair can be performed with a wide range of heat input. The effect of post-weld heat treatment (PWHT) on the microstructure and mechanical properties in the heat affected zone (HAZ) and weld metal was also investigated in this research. The dominant microstructure in weld metal at as-welded condition is coarse Widmanstatten type structure with high hardness; post-weld heat treatment resulted in significant grain refinement and hardness reduction in weld metal.

Effect of filler wire and post weld heat treatment on the mechanical properties of laser beam-welded AA2198

2021 ◽  
pp. 111257
Author(s):  
Theano N. Examilioti ◽  
Nikolai Kashaev ◽  
Volker Ventzke ◽  
Benjamin Klusemann ◽  
Nikolaos D. Alexopoulos
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Laser Beam ◽  
Post Weld Heat Treatment ◽  
Filler Wire ◽  
Weld Heat

Effect of post-weld heat treatment on the joint of friction-welded 1MnCrMoNi steel

2021 ◽  
Vol 26 (3) ◽  
pp. 220-226
Author(s):  
Qidong Nie ◽  
Xiang Wang ◽  
Sheng Wang ◽  
Ningxing Li ◽  
Xinlin Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Weld Heat

scholarly journals Influence of post weld heat treatment on tensile properties of cold metal transfer (CMT) arc welded AA6061-T6 aluminium alloy joints

2019 ◽  
Vol 28 (1) ◽  
pp. 135-145 ◽  
Author(s):  
Addanki Ramaswamy ◽  
Sudersanan Malarvizhi ◽  
Visvalingam Balasubramanian
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Gas Metal Arc Welding ◽  
Weight Ratio ◽  
Welding Process ◽  
Metal Transfer ◽  
Post Weld Heat Treatment ◽  
Cold Metal Transfer ◽  
Cold Metal ◽  
Weld Heat

AbstractAluminium alloys of 6xxx series are widely used in the fabrication of light weight structures especially, where high strength to weight ratio and excellent weld-ability characteristics are desirable. Gas metal arc welding (GMAW) is the most predominantly used welding process in many industries due to the ease of automation. In this investigation, an attempt has been made to identify the best variant of GMAW process to overcome the problems like alloy segregation, precipitate dissolution and heat affected zone (HAZ) softening. Thin sheets of AA6061-T6 alloy were welded by cold metal transfer (CMT) and Pulsed CMT (PCMT). Among the two joints, the joint made by PCMT technique exhibited superior tensile properties due to the mechanical stirring action in the weld pool caused by forward and rearward movement of the wire along with the controllable diffusion rate at the interface caused by shorter solidification time. However, softening still exists in the welded joints. Further to increase the joint efficiency and to minimize HAZ softening, the joints were subjected to post weld heat treatment (PWHT). Approximately 10% improvement in the tensile properties had been observed in the PWHT joints due to the nucleation of strengthening precipitates in the weld metal and HAZ.

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