The Effect of Post Weld Heat Treatment on Mechanical Properties of Friction-Welded Alloy 718 and SNCRW Stainless Steel

2007 ◽  
Vol 26-28 ◽  
pp. 511-514 ◽  
Author(s):  
Nam Yong Kim ◽  
Jeoung Han Kim ◽  
Yu Sik Kong ◽  
Jong Won Yoon ◽  
Jong Taek Yeom ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Weld Joint ◽  
Friction Welding ◽  
Rotation Speed ◽  
Post Weld Heat Treatment ◽  
Alloy 718 ◽  
Temperature Range ◽  
Heat Treated ◽  
Weld Heat

The effect of post weld heat treatment on mechanical properties of friction welded Alloy 718 and SNCRW was investigated. Friction welding tests were carried out at a constant rotation speed and pressure. Optimum friction condition was found to be the friction pressure of 25kg/cm2, friction time of 40sec, upset pressure of 80 kg/cm2, and dwell time of 5sec. After friction welding tests, post weld heat treatments were performed in the temperature range of 500-900°C for 8hrs in order to investigate the microstructure and mechanical properties of weld joint. Specimens with the post weld heat treatment at 720°C for 8hrs show optimal mechanical properties. Residual stress of post weld heat treated specimens was measured to weld joint in the same temperature range. After friction welding tests on samples with a diameter of 80mm, tensile properties of post-weld-heat-treated and non-heat-treated samples were compared.

scholarly journals Influence of post weld heat treatment for weld joint of P355GH

2018 ◽  
Vol 247 ◽  
pp. 00038
Author(s):  
Sławomir Parzych ◽  
Rafał Dziurka
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Quality Control ◽  
High Temperature ◽  
Weld Joint ◽  
Post Weld Heat Treatment ◽  
Microstructure And Properties ◽  
Welding Method ◽  
Welding Procedure ◽  
Weld Heat

From steel designed to work under pressure and exposed to high temperature apart from the good weldability, good mechanical properties are required. The guidelines set by the regulations require post welding heat treatment above 35mm thick. An important factor affecting the microstructure and properties of the joint made of thick-walled elements is heat treatment after welding. All welding operations must be properly planned before performing welding work. Welding procedure specification (WPS) is a document describing these operations, it is essential for proper determining of basics in planning welding operations and quality control in welding. The purpose of this paper is to compare the properties of joints made by 121 welding method in combination with and without post welding heat treatment.

Evaluation on Chloride Cracking of S135 High-Strength Drill Pipe

2012 ◽  
Vol 430-432 ◽  
pp. 636-639
Author(s):  
Zhang Zhi ◽  
Xiao Yu Zhou ◽  
De Zhi Zeng ◽  
Ji Yin Zhang ◽  
Tai He Shi
Keyword(s):  
Heat Treatment ◽  
Weld Joint ◽  
Friction Welding ◽  
Drilling Fluid ◽  
Drill Pipe ◽  
High Strength ◽  
Chloride Ions ◽  
Post Weld Heat Treatment ◽  
Uniform Corrosion ◽  
Weld Heat

During the process of deep drilling with high temperature and high pressure, downhole drilling tools might be exposed to various corrosive mediums, such as water/oil-based drilling fluid systems, dissolved oxygen, H2S/CO2, halogen elements (Cl- and Br-), etc. Halogen elements existing in the drilling fluid are ions promoting corrosion of metals. This effect is mainly manifested in the forms of uniform corrosion, pitting corrosion, stress corrosion cracking, etc. of carbon steel. Quality of the drill pipe is determined by the DP body, joint and welding area of the drill pipe. Reasonable friction welding process and proper post weld heat treatment can make the mechanical property of weld joint satisfy related standards. If process of friction welding or post weld heat treatment is improper, the weld joint will be easily damaged and accidents of pricking, breaking, etc will be likely aroused. This paper carries out an evaluation experiment of chloride cracking on the DP body, joints and weld joints of the high-strength drill pipe (S135) and discusses corrosion of the high-strength drill pipe caused by chloride ions.

Evaluation of Secondary Hardening and Microstructure in the Real T24 Steel Weld Joint

2015 ◽  
Vol 1111 ◽  
pp. 151-156
Author(s):  
Martin Sondel ◽  
Jaroslav Koukal ◽  
David Schwarz ◽  
Drahomir Schwarz
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Weld Joint ◽  
Creep Resistance ◽  
Post Weld Heat Treatment ◽  
Secondary Hardening ◽  
The Real ◽  
Weld Joints ◽  
Heat Treated ◽  
Weld Heat

Development of new steels with higher creep resistance must be based on detailed knowledge of strengthening and degradation processes, structural stability at high temperature exposure and their welding. This paper is concerned with the real weld joint hardness and microstructure of progressive low alloy creep resistance T24 steel. These steel is widely used in many power-plant constructions all over the Europe. Welding the T24 steels components is one of the most important technological procedures. The aim of the performed investigation is to evaluate the hardness and microstructure in the heat affected zone (HAZ) and the weld metal. Results of the secondary hardening in the real weld joints after low temperature post weld heat treatment (460°C/48h) and without post weld heat treatment at service temperature are described in this paper. Obtained results are compared to the hardness values of the weld joint post weld heat treated at recommended temperature (740°C). The microstructure of the real weld joints was analysed by transmission electron microscopy (TEM) in order to identify minority phases - MX nanoparticles and/or coarse (M23C6) particles. Secondary hardening of the not heat treated and low temperature heat treated T24 weld joint was proved.

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
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